Annotation of loncom/interface/loncoursedata.pm, revision 1.141.2.2

1.1       stredwic    1: # The LearningOnline Network with CAPA
                      2: #
1.141.2.2! albertel    3: # $Id: loncoursedata.pm,v 1.141.2.1 2005/04/19 21:13:24 albertel Exp $
1.1       stredwic    4: #
                      5: # Copyright Michigan State University Board of Trustees
                      6: #
                      7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                      8: #
                      9: # LON-CAPA is free software; you can redistribute it and/or modify
                     10: # it under the terms of the GNU General Public License as published by
                     11: # the Free Software Foundation; either version 2 of the License, or
                     12: # (at your option) any later version.
                     13: #
                     14: # LON-CAPA is distributed in the hope that it will be useful,
                     15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     17: # GNU General Public License for more details.
                     18: #
                     19: # You should have received a copy of the GNU General Public License
                     20: # along with LON-CAPA; if not, write to the Free Software
                     21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     22: #
                     23: # /home/httpd/html/adm/gpl.txt
                     24: #
                     25: # http://www.lon-capa.org/
                     26: #
                     27: ###
                     28: 
                     29: =pod
                     30: 
                     31: =head1 NAME
                     32: 
                     33: loncoursedata
                     34: 
                     35: =head1 SYNOPSIS
                     36: 
1.22      stredwic   37: Set of functions that download and process student and course information.
1.1       stredwic   38: 
                     39: =head1 PACKAGES USED
                     40: 
                     41:  Apache::Constants qw(:common :http)
                     42:  Apache::lonnet()
1.22      stredwic   43:  Apache::lonhtmlcommon
1.1       stredwic   44:  HTML::TokeParser
                     45:  GDBM_File
                     46: 
                     47: =cut
                     48: 
                     49: package Apache::loncoursedata;
                     50: 
                     51: use strict;
                     52: use Apache::Constants qw(:common :http);
                     53: use Apache::lonnet();
1.13      stredwic   54: use Apache::lonhtmlcommon;
1.57      matthew    55: use Time::HiRes;
                     56: use Apache::lonmysql;
1.1       stredwic   57: use HTML::TokeParser;
                     58: use GDBM_File;
                     59: 
                     60: =pod
                     61: 
                     62: =head1 DOWNLOAD INFORMATION
                     63: 
1.22      stredwic   64: This section contains all the functions that get data from other servers 
                     65: and/or itself.
1.1       stredwic   66: 
                     67: =cut
                     68: 
1.50      matthew    69: ####################################################
                     70: ####################################################
1.45      matthew    71: 
                     72: =pod
                     73: 
                     74: =item &get_sequence_assessment_data()
                     75: 
                     76: Use lonnavmaps to build a data structure describing the order and 
                     77: assessment contents of each sequence in the current course.
                     78: 
                     79: The returned structure is a hash reference. 
                     80: 
1.61      matthew    81: { title => 'title',
                     82:   symb  => 'symb',
                     83:   src   => '/s/o/u/r/c/e',
1.45      matthew    84:   type  => (container|assessment),
1.50      matthew    85:   num_assess   => 2,               # only for container
1.45      matthew    86:   parts        => [11,13,15],      # only for assessment
1.50      matthew    87:   response_ids => [12,14,16],      # only for assessment
                     88:   contents     => [........]       # only for container
1.45      matthew    89: }
                     90: 
1.50      matthew    91: $hash->{'contents'} is a reference to an array of hashes of the same structure.
                     92: 
                     93: Also returned are array references to the sequences and assessments contained
                     94: in the course.
1.49      matthew    95: 
1.45      matthew    96: 
                     97: =cut
                     98: 
1.50      matthew    99: ####################################################
                    100: ####################################################
1.45      matthew   101: sub get_sequence_assessment_data {
                    102:     my $fn=$ENV{'request.course.fn'};
                    103:     ##
                    104:     ## use navmaps
1.83      bowersj2  105:     my $navmap = Apache::lonnavmaps::navmap->new();
1.45      matthew   106:     if (!defined($navmap)) {
                    107:         return 'Can not open Coursemap';
                    108:     }
1.75      matthew   109:     # We explicity grab the top level map because I am not sure we
                    110:     # are pulling it from the iterator.
                    111:     my $top_level_map = $navmap->getById('0.0');
                    112:     #
1.45      matthew   113:     my $iterator = $navmap->getIterator(undef, undef, undef, 1);
1.61      matthew   114:     my $curRes = $iterator->next(); # Top level sequence
1.45      matthew   115:     ##
                    116:     ## Prime the pump 
                    117:     ## 
                    118:     ## We are going to loop until we run out of sequences/pages to explore for
                    119:     ## resources.  This means we have to start out with something to look
                    120:     ## at.
1.76      matthew   121:     my $title = $ENV{'course.'.$ENV{'request.course.id'}.'.description'};
1.75      matthew   122:     my $symb  = $top_level_map->symb();
                    123:     my $src   = $top_level_map->src();
                    124:     my $randompick = $top_level_map->randompick();
1.45      matthew   125:     #
1.49      matthew   126:     my @Sequences; 
                    127:     my @Assessments;
1.45      matthew   128:     my @Nested_Sequences = ();   # Stack of sequences, keeps track of depth
                    129:     my $top = { title    => $title,
1.52      matthew   130:                 src      => $src,
1.45      matthew   131:                 symb     => $symb,
                    132:                 type     => 'container',
                    133:                 num_assess => 0,
1.53      matthew   134:                 num_assess_parts => 0,
1.75      matthew   135:                 contents   => [], 
                    136:                 randompick => $randompick,
                    137:             };
1.49      matthew   138:     push (@Sequences,$top);
1.45      matthew   139:     push (@Nested_Sequences, $top);
                    140:     #
                    141:     # We need to keep track of which sequences contain homework problems
                    142:     # 
1.78      matthew   143:     my $previous_too;
1.52      matthew   144:     my $previous;
1.45      matthew   145:     while (scalar(@Nested_Sequences)) {
1.78      matthew   146:         $previous_too = $previous;
1.50      matthew   147:         $previous = $curRes;
1.141.2.1  albertel  148:         $curRes = $iterator->next(1);
1.141.2.2! albertel  149: 	if (!$curRes) { last; }
1.45      matthew   150:         my $currentmap = $Nested_Sequences[-1]; # Last one on the stack
                    151:         if ($curRes == $iterator->BEGIN_MAP()) {
1.78      matthew   152:             if (! ref($previous)) {
                    153:                 $previous = $previous_too;
                    154:             }
                    155:             if (! ref($previous)) {
                    156:                 next;
                    157:             }
1.45      matthew   158:             # get the map itself, instead of BEGIN_MAP
1.139     matthew   159:             $title = $previous->compTitle;
1.51      matthew   160:             $symb  = $previous->symb();
                    161:             $src   = $previous->src();
1.75      matthew   162:             $randompick = $previous->randompick();
1.45      matthew   163:             my $newmap = { title    => $title,
                    164:                            src      => $src,
                    165:                            symb     => $symb,
                    166:                            type     => 'container',
                    167:                            num_assess => 0,
1.75      matthew   168:                            randompick => $randompick,
1.45      matthew   169:                            contents   => [],
                    170:                        };
                    171:             push (@{$currentmap->{'contents'}},$newmap); # this is permanent
1.49      matthew   172:             push (@Sequences,$newmap);
1.45      matthew   173:             push (@Nested_Sequences, $newmap); # this is a stack
                    174:             next;
                    175:         }
                    176:         if ($curRes == $iterator->END_MAP()) {
                    177:             pop(@Nested_Sequences);
                    178:             next;
                    179:         }
                    180:         next if (! ref($curRes));
1.121     matthew   181:         next if (! $curRes->is_problem() && $curRes->src() !~ /\.survey$/);
1.45      matthew   182:         # Okay, from here on out we only deal with assessments
1.139     matthew   183:         $title = $curRes->compTitle();
1.45      matthew   184:         $symb  = $curRes->symb();
                    185:         $src   = $curRes->src();
                    186:         my $parts = $curRes->parts();
1.87      matthew   187:         my %partdata;
                    188:         foreach my $part (@$parts) {
1.88      matthew   189:             my @Responses = $curRes->responseType($part);
                    190:             my @Ids       = $curRes->responseIds($part);
                    191:             $partdata{$part}->{'ResponseTypes'}= \@Responses;
                    192:             $partdata{$part}->{'ResponseIds'}  = \@Ids;
1.135     matthew   193:             $partdata{$part}->{'Survey'}       = $curRes->is_survey($part);
1.91      matthew   194:             # Count how many responses of each type there are in this part
                    195:             foreach (@Responses) {
                    196:                 $partdata{$part}->{$_}++;
                    197:             }
1.87      matthew   198:         }
1.45      matthew   199:         my $assessment = { title => $title,
                    200:                            src   => $src,
                    201:                            symb  => $symb,
                    202:                            type  => 'assessment',
1.53      matthew   203:                            parts => $parts,
                    204:                            num_parts => scalar(@$parts),
1.87      matthew   205:                            partdata => \%partdata,
1.45      matthew   206:                        };
1.49      matthew   207:         push(@Assessments,$assessment);
1.45      matthew   208:         push(@{$currentmap->{'contents'}},$assessment);
                    209:         $currentmap->{'num_assess'}++;
1.53      matthew   210:         $currentmap->{'num_assess_parts'}+= scalar(@$parts);
1.45      matthew   211:     }
1.49      matthew   212:     return ($top,\@Sequences,\@Assessments);
1.45      matthew   213: }
1.50      matthew   214: 
1.4       stredwic  215: sub LoadDiscussion {
1.13      stredwic  216:     my ($courseID)=@_;
1.5       minaeibi  217:     my %Discuss=();
                    218:     my %contrib=&Apache::lonnet::dump(
                    219:                 $courseID,
                    220:                 $ENV{'course.'.$courseID.'.domain'},
                    221:                 $ENV{'course.'.$courseID.'.num'});
                    222: 				 
                    223:     #my %contrib=&DownloadCourseInformation($name, $courseID, 0);
                    224: 
1.4       stredwic  225:     foreach my $temp(keys %contrib) {
                    226: 	if ($temp=~/^version/) {
                    227: 	    my $ver=$contrib{$temp};
                    228: 	    my ($dummy,$prb)=split(':',$temp);
                    229: 	    for (my $idx=1; $idx<=$ver; $idx++ ) {
                    230: 		my $name=$contrib{"$idx:$prb:sendername"};
1.5       minaeibi  231: 		$Discuss{"$name:$prb"}=$idx;	
1.4       stredwic  232: 	    }
                    233: 	}
                    234:     }       
1.5       minaeibi  235: 
                    236:     return \%Discuss;
1.1       stredwic  237: }
                    238: 
1.71      matthew   239: ################################################
                    240: ################################################
                    241: 
                    242: =pod
                    243: 
1.47      matthew   244: =item &make_into_hash($values);
                    245: 
                    246: Returns a reference to a hash as described by $values.  $values is
                    247: assumed to be the result of 
1.57      matthew   248:     join(':',map {&Apache::lonnet::escape($_)} %orighash);
1.47      matthew   249: 
                    250: This is a helper function for get_current_state.
                    251: 
                    252: =cut
                    253: 
                    254: ################################################
                    255: ################################################
                    256: sub make_into_hash {
                    257:     my $values = shift;
                    258:     my %tmp = map { &Apache::lonnet::unescape($_); }
                    259:                                            split(':',$values);
                    260:     return \%tmp;
                    261: }
                    262: 
                    263: 
                    264: ################################################
                    265: ################################################
                    266: 
                    267: =pod
                    268: 
1.57      matthew   269: =head1 LOCAL DATA CACHING SUBROUTINES
                    270: 
                    271: The local caching is done using MySQL.  There is no fall-back implementation
                    272: if MySQL is not running.
                    273: 
                    274: The programmers interface is to call &get_current_state() or some other
                    275: primary interface subroutine (described below).  The internals of this 
                    276: storage system are documented here.
                    277: 
                    278: There are six tables used to store student performance data (the results of
                    279: a dumpcurrent).  Each of these tables is created in MySQL with a name of
                    280: $courseid_*****, where ***** is 'symb', 'part', or whatever is appropriate 
                    281: for the table.  The tables and their purposes are described below.
                    282: 
                    283: Some notes before we get started.
                    284: 
                    285: Each table must have a PRIMARY KEY, which is a column or set of columns which
                    286: will serve to uniquely identify a row of data.  NULL is not allowed!
                    287: 
                    288: INDEXes work best on integer data.
                    289: 
                    290: JOIN is used to combine data from many tables into one output.
                    291: 
                    292: lonmysql.pm is used for some of the interface, specifically the table creation
                    293: calls.  The inserts are done in bulk by directly calling the database handler.
                    294: The SELECT ... JOIN statement used to retrieve the data does not have an
                    295: interface in lonmysql.pm and I shudder at the thought of writing one.
                    296: 
                    297: =head3 Table Descriptions
                    298: 
                    299: =over 4
                    300: 
1.89      matthew   301: =item Tables used to store meta information
                    302: 
                    303: The following tables hold data required to keep track of the current status
                    304: of a students data in the tables or to look up the students data in the tables.
                    305: 
                    306: =over 4
                    307: 
1.57      matthew   308: =item $symb_table
                    309: 
                    310: The symb_table has two columns.  The first is a 'symb_id' and the second
                    311: is the text name for the 'symb' (limited to 64k).  The 'symb_id' is generated
                    312: automatically by MySQL so inserts should be done on this table with an
                    313: empty first element.  This table has its PRIMARY KEY on the 'symb_id'.
                    314: 
                    315: =item $part_table
                    316: 
                    317: The part_table has two columns.  The first is a 'part_id' and the second
                    318: is the text name for the 'part' (limited to 100 characters).  The 'part_id' is
                    319: generated automatically by MySQL so inserts should be done on this table with
                    320: an empty first element.  This table has its PRIMARY KEY on the 'part' (100
                    321: characters) and a KEY on 'part_id'.
                    322: 
                    323: =item $student_table
                    324: 
1.113     matthew   325: The student_table has 7 columns.  The first is a 'student_id' assigned by 
                    326: MySQL.  The second is 'student' which is username:domain.  The third through
                    327: fifth are 'section', 'status' (enrollment status), and 'classification' 
                    328: (to be used in the future).  The sixth and seventh ('updatetime' and 
                    329: 'fullupdatetime') contain the time of last update and full update of student
                    330: data.  This table has its PRIMARY KEY on the 'student_id' column and is indexed
                    331: on 'student', 'section', and 'status'.
1.89      matthew   332: 
                    333: =back 
                    334: 
                    335: =item Tables used to store current status data
                    336: 
                    337: The following tables store data only about the students current status on 
                    338: a problem, meaning only the data related to the last attempt on a problem.
                    339: 
                    340: =over 4
1.57      matthew   341: 
                    342: =item $performance_table
                    343: 
                    344: The performance_table has 9 columns.  The first three are 'symb_id', 
                    345: 'student_id', and 'part_id'.  These comprise the PRIMARY KEY for this table
                    346: and are directly related to the $symb_table, $student_table, and $part_table
                    347: described above.  MySQL does better indexing on numeric items than text,
                    348: so we use these three "index tables".  The remaining columns are
                    349: 'solved', 'tries', 'awarded', 'award', 'awarddetail', and 'timestamp'.
                    350: These are either the MySQL type TINYTEXT or various integers ('tries' and 
                    351: 'timestamp').  This table has KEYs of 'student_id' and 'symb_id'.
                    352: For use of this table, see the functions described below.
                    353: 
                    354: =item $parameters_table
                    355: 
                    356: The parameters_table holds the data that does not fit neatly into the
                    357: performance_table.  The parameters table has four columns: 'symb_id',
                    358: 'student_id', 'parameter', and 'value'.  'symb_id', 'student_id', and
                    359: 'parameter' comprise the PRIMARY KEY for this table.  'parameter' is 
                    360: limited to 255 characters.  'value' is limited to 64k characters.
                    361: 
                    362: =back
                    363: 
1.89      matthew   364: =item Tables used for storing historic data
                    365: 
                    366: The following tables are used to store almost all of the transactions a student
                    367: has made on a homework problem.  See loncapa/docs/homework/datastorage for 
                    368: specific information about each of the parameters stored.  
                    369: 
                    370: =over 4
                    371: 
                    372: =item $fulldump_response_table
                    373: 
                    374: The response table holds data (documented in loncapa/docs/homework/datastorage)
                    375: associated with a particular response id which is stored when a student 
                    376: attempts a problem.  The following are the columns of the table, in order:
                    377: 'symb_id','part_id','response_id','student_id','transaction','tries',
1.93      matthew   378: 'awarddetail', 'response_specific' (data particular to the response
1.89      matthew   379: type), 'response_specific_value', and 'submission (the text of the students
                    380: submission).  The primary key is based on the first five columns listed above.
                    381: 
                    382: =item $fulldump_part_table
                    383: 
                    384: The part table holds data (documented in loncapa/docs/homework/datastorage)
                    385: associated with a particular part id which is stored when a student attempts
                    386: a problem.  The following are the columns of the table, in order:
                    387: 'symb_id','part_id','student_id','transaction','tries','award','awarded',
                    388: and 'previous'.  The primary key is based on the first five columns listed 
                    389: above.
                    390: 
                    391: =item $fulldump_timestamp_table
                    392: 
                    393: The timestamp table holds the timestamps of the transactions which are
                    394: stored in $fulldump_response_table and $fulldump_part_table.  This data is
                    395: about both the response and part data.  Columns: 'symb_id','student_id',
                    396: 'transaction', and 'timestamp'.  
                    397: The primary key is based on the first 3 columns.
                    398: 
1.127     matthew   399: =item $weight_table
                    400: 
                    401: The weight table holds the weight for the problems used in the class.
                    402: Whereas the weight of a problem can vary by section and student the data
                    403: here is applied to the class as a whole.
                    404: Columns: 'symb_id','part_id','response_id','weight'.
                    405: 
1.89      matthew   406: =back
                    407: 
                    408: =back
                    409: 
1.57      matthew   410: =head3 Important Subroutines
                    411: 
                    412: Here is a brief overview of the subroutines which are likely to be of 
                    413: interest:
                    414: 
                    415: =over 4
                    416: 
                    417: =item &get_current_state(): programmers interface.
                    418: 
                    419: =item &init_dbs(): table creation
                    420: 
                    421: =item &update_student_data(): data storage calls
                    422: 
                    423: =item &get_student_data_from_performance_cache(): data retrieval
                    424: 
                    425: =back
                    426: 
                    427: =head3 Main Documentation
                    428: 
                    429: =over 4
                    430: 
                    431: =cut
                    432: 
                    433: ################################################
                    434: ################################################
                    435: 
                    436: ################################################
                    437: ################################################
1.89      matthew   438: { # Begin scope of table identifiers
1.57      matthew   439: 
                    440: my $current_course ='';
                    441: my $symb_table;
                    442: my $part_table;
                    443: my $student_table;
                    444: my $performance_table;
                    445: my $parameters_table;
1.89      matthew   446: my $fulldump_response_table;
                    447: my $fulldump_part_table;
                    448: my $fulldump_timestamp_table;
1.127     matthew   449: my $weight_table;
1.57      matthew   450: 
1.89      matthew   451: my @Tables;
1.57      matthew   452: ################################################
                    453: ################################################
                    454: 
                    455: =pod
                    456: 
                    457: =item &init_dbs()
                    458: 
                    459: Input: course id
                    460: 
                    461: Output: 0 on success, positive integer on error
                    462: 
                    463: This routine issues the calls to lonmysql to create the tables used to
                    464: store student data.
                    465: 
                    466: =cut
                    467: 
                    468: ################################################
                    469: ################################################
                    470: sub init_dbs {
1.134     matthew   471:     my ($courseid,$drop) = @_;
1.57      matthew   472:     &setup_table_names($courseid);
                    473:     #
1.73      matthew   474:     # Drop any of the existing tables
1.134     matthew   475:     if ($drop) {
                    476:         foreach my $table (@Tables) {
                    477:             &Apache::lonmysql::drop_table($table);
                    478:         }
1.73      matthew   479:     }
                    480:     #
1.57      matthew   481:     # Note - changes to this table must be reflected in the code that 
                    482:     # stores the data (calls &Apache::lonmysql::store_row with this table
                    483:     # id
                    484:     my $symb_table_def = {
                    485:         id => $symb_table,
                    486:         permanent => 'no',
                    487:         columns => [{ name => 'symb_id',
                    488:                       type => 'MEDIUMINT UNSIGNED',
                    489:                       restrictions => 'NOT NULL',
                    490:                       auto_inc     => 'yes', },
                    491:                     { name => 'symb',
                    492:                       type => 'MEDIUMTEXT',
                    493:                       restrictions => 'NOT NULL'},
                    494:                     ],
                    495:         'PRIMARY KEY' => ['symb_id'],
                    496:     };
                    497:     #
                    498:     my $part_table_def = {
                    499:         id => $part_table,
                    500:         permanent => 'no',
                    501:         columns => [{ name => 'part_id',
                    502:                       type => 'MEDIUMINT UNSIGNED',
                    503:                       restrictions => 'NOT NULL',
                    504:                       auto_inc     => 'yes', },
                    505:                     { name => 'part',
1.132     matthew   506:                       type => 'VARCHAR(100) BINARY',
1.57      matthew   507:                       restrictions => 'NOT NULL'},
                    508:                     ],
                    509:         'PRIMARY KEY' => ['part (100)'],
                    510:         'KEY' => [{ columns => ['part_id']},],
                    511:     };
                    512:     #
                    513:     my $student_table_def = {
                    514:         id => $student_table,
                    515:         permanent => 'no',
                    516:         columns => [{ name => 'student_id',
                    517:                       type => 'MEDIUMINT UNSIGNED',
                    518:                       restrictions => 'NOT NULL',
                    519:                       auto_inc     => 'yes', },
                    520:                     { name => 'student',
1.132     matthew   521:                       type => 'VARCHAR(100) BINARY',
1.113     matthew   522:                       restrictions => 'NOT NULL UNIQUE'},
                    523:                     { name => 'section',
1.132     matthew   524:                       type => 'VARCHAR(100) BINARY',
1.113     matthew   525:                       restrictions => 'NOT NULL'},
                    526:                     { name => 'status',
1.132     matthew   527:                       type => 'VARCHAR(15) BINARY',
1.57      matthew   528:                       restrictions => 'NOT NULL'},
1.85      matthew   529:                     { name => 'classification',
1.132     matthew   530:                       type => 'VARCHAR(100) BINARY', },
1.57      matthew   531:                     { name => 'updatetime',
1.89      matthew   532:                       type => 'INT UNSIGNED'},
                    533:                     { name => 'fullupdatetime',
                    534:                       type => 'INT UNSIGNED'},
1.57      matthew   535:                     ],
1.87      matthew   536:         'PRIMARY KEY' => ['student_id'],
1.113     matthew   537:         'KEY' => [{ columns => ['student (100)',
                    538:                                 'section (100)',
                    539:                                 'status (15)',]},],
1.57      matthew   540:     };
                    541:     #
                    542:     my $performance_table_def = {
                    543:         id => $performance_table,
                    544:         permanent => 'no',
                    545:         columns => [{ name => 'symb_id',
                    546:                       type => 'MEDIUMINT UNSIGNED',
                    547:                       restrictions => 'NOT NULL'  },
                    548:                     { name => 'student_id',
                    549:                       type => 'MEDIUMINT UNSIGNED',
                    550:                       restrictions => 'NOT NULL'  },
                    551:                     { name => 'part_id',
                    552:                       type => 'MEDIUMINT UNSIGNED',
                    553:                       restrictions => 'NOT NULL' },
1.73      matthew   554:                     { name => 'part',
1.132     matthew   555:                       type => 'VARCHAR(100) BINARY',
1.73      matthew   556:                       restrictions => 'NOT NULL'},                    
1.57      matthew   557:                     { name => 'solved',
                    558:                       type => 'TINYTEXT' },
                    559:                     { name => 'tries',
                    560:                       type => 'SMALLINT UNSIGNED' },
                    561:                     { name => 'awarded',
1.127     matthew   562:                       type => 'REAL' },
1.57      matthew   563:                     { name => 'award',
                    564:                       type => 'TINYTEXT' },
                    565:                     { name => 'awarddetail',
                    566:                       type => 'TINYTEXT' },
                    567:                     { name => 'timestamp',
                    568:                       type => 'INT UNSIGNED'},
                    569:                     ],
                    570:         'PRIMARY KEY' => ['symb_id','student_id','part_id'],
                    571:         'KEY' => [{ columns=>['student_id'] },
                    572:                   { columns=>['symb_id'] },],
                    573:     };
                    574:     #
1.89      matthew   575:     my $fulldump_part_table_def = {
                    576:         id => $fulldump_part_table,
                    577:         permanent => 'no',
                    578:         columns => [
                    579:                     { name => 'symb_id',
                    580:                       type => 'MEDIUMINT UNSIGNED',
                    581:                       restrictions => 'NOT NULL'  },
                    582:                     { name => 'part_id',
                    583:                       type => 'MEDIUMINT UNSIGNED',
                    584:                       restrictions => 'NOT NULL' },
                    585:                     { name => 'student_id',
                    586:                       type => 'MEDIUMINT UNSIGNED',
                    587:                       restrictions => 'NOT NULL'  },
                    588:                     { name => 'transaction',
                    589:                       type => 'MEDIUMINT UNSIGNED',
                    590:                       restrictions => 'NOT NULL' },
                    591:                     { name => 'tries',
                    592:                       type => 'SMALLINT UNSIGNED',
                    593:                       restrictions => 'NOT NULL' },
                    594:                     { name => 'award',
                    595:                       type => 'TINYTEXT' },
                    596:                     { name => 'awarded',
1.127     matthew   597:                       type => 'REAL' },
1.89      matthew   598:                     { name => 'previous',
                    599:                       type => 'SMALLINT UNSIGNED' },
                    600: #                    { name => 'regrader',
                    601: #                      type => 'TINYTEXT' },
                    602: #                    { name => 'afterduedate',
                    603: #                      type => 'TINYTEXT' },
                    604:                     ],
                    605:         'PRIMARY KEY' => ['symb_id','part_id','student_id','transaction'],
                    606:         'KEY' => [
                    607:                   { columns=>['symb_id'] },
                    608:                   { columns=>['part_id'] },
                    609:                   { columns=>['student_id'] },
                    610:                   ],
                    611:     };
                    612:     #
                    613:     my $fulldump_response_table_def = {
                    614:         id => $fulldump_response_table,
                    615:         permanent => 'no',
                    616:         columns => [
                    617:                     { name => 'symb_id',
                    618:                       type => 'MEDIUMINT UNSIGNED',
                    619:                       restrictions => 'NOT NULL'  },
                    620:                     { name => 'part_id',
                    621:                       type => 'MEDIUMINT UNSIGNED',
                    622:                       restrictions => 'NOT NULL' },
                    623:                     { name => 'response_id',
                    624:                       type => 'MEDIUMINT UNSIGNED',
                    625:                       restrictions => 'NOT NULL'  },
                    626:                     { name => 'student_id',
                    627:                       type => 'MEDIUMINT UNSIGNED',
                    628:                       restrictions => 'NOT NULL'  },
                    629:                     { name => 'transaction',
                    630:                       type => 'MEDIUMINT UNSIGNED',
                    631:                       restrictions => 'NOT NULL' },
                    632:                     { name => 'awarddetail',
                    633:                       type => 'TINYTEXT' },
                    634: #                    { name => 'message',
1.132     matthew   635: #                      type => 'CHAR BINARY'},
1.89      matthew   636:                     { name => 'response_specific',
                    637:                       type => 'TINYTEXT' },
                    638:                     { name => 'response_specific_value',
                    639:                       type => 'TINYTEXT' },
                    640:                     { name => 'submission',
                    641:                       type => 'TEXT'},
                    642:                     ],
                    643:             'PRIMARY KEY' => ['symb_id','part_id','response_id','student_id',
                    644:                               'transaction'],
                    645:             'KEY' => [
                    646:                       { columns=>['symb_id'] },
                    647:                       { columns=>['part_id','response_id'] },
                    648:                       { columns=>['student_id'] },
                    649:                       ],
                    650:     };
                    651:     my $fulldump_timestamp_table_def = {
                    652:         id => $fulldump_timestamp_table,
                    653:         permanent => 'no',
                    654:         columns => [
                    655:                     { name => 'symb_id',
                    656:                       type => 'MEDIUMINT UNSIGNED',
                    657:                       restrictions => 'NOT NULL'  },
                    658:                     { name => 'student_id',
                    659:                       type => 'MEDIUMINT UNSIGNED',
                    660:                       restrictions => 'NOT NULL'  },
                    661:                     { name => 'transaction',
                    662:                       type => 'MEDIUMINT UNSIGNED',
                    663:                       restrictions => 'NOT NULL' },
                    664:                     { name => 'timestamp',
                    665:                       type => 'INT UNSIGNED'},
                    666:                     ],
                    667:         'PRIMARY KEY' => ['symb_id','student_id','transaction'],
                    668:         'KEY' => [
                    669:                   { columns=>['symb_id'] },
                    670:                   { columns=>['student_id'] },
                    671:                   { columns=>['transaction'] },
                    672:                   ],
                    673:     };
                    674:     #
1.57      matthew   675:     my $parameters_table_def = {
                    676:         id => $parameters_table,
                    677:         permanent => 'no',
                    678:         columns => [{ name => 'symb_id',
                    679:                       type => 'MEDIUMINT UNSIGNED',
                    680:                       restrictions => 'NOT NULL'  },
                    681:                     { name => 'student_id',
                    682:                       type => 'MEDIUMINT UNSIGNED',
                    683:                       restrictions => 'NOT NULL'  },
                    684:                     { name => 'parameter',
                    685:                       type => 'TINYTEXT',
                    686:                       restrictions => 'NOT NULL'  },
                    687:                     { name => 'value',
                    688:                       type => 'MEDIUMTEXT' },
                    689:                     ],
                    690:         'PRIMARY KEY' => ['symb_id','student_id','parameter (255)'],
                    691:     };
                    692:     #
1.127     matthew   693:     my $weight_table_def = {
                    694:         id => $weight_table,
                    695:         permanent => 'no',
                    696:         columns => [{ name => 'symb_id',
                    697:                       type => 'MEDIUMINT UNSIGNED',
                    698:                       restrictions => 'NOT NULL'  },
                    699:                     { name => 'part_id',
                    700:                       type => 'MEDIUMINT UNSIGNED',
                    701:                       restrictions => 'NOT NULL'  },
                    702:                     { name => 'weight',
                    703:                       type => 'REAL',
                    704:                       restrictions => 'NOT NULL'  },
                    705:                     ],
                    706:         'PRIMARY KEY' => ['symb_id','part_id'],
                    707:     };
                    708:     #
1.57      matthew   709:     # Create the tables
                    710:     my $tableid;
                    711:     $tableid = &Apache::lonmysql::create_table($symb_table_def);
                    712:     if (! defined($tableid)) {
                    713:         &Apache::lonnet::logthis("error creating symb_table: ".
                    714:                                  &Apache::lonmysql::get_error());
                    715:         return 1;
                    716:     }
                    717:     #
                    718:     $tableid = &Apache::lonmysql::create_table($part_table_def);
                    719:     if (! defined($tableid)) {
                    720:         &Apache::lonnet::logthis("error creating part_table: ".
                    721:                                  &Apache::lonmysql::get_error());
                    722:         return 2;
                    723:     }
                    724:     #
                    725:     $tableid = &Apache::lonmysql::create_table($student_table_def);
                    726:     if (! defined($tableid)) {
                    727:         &Apache::lonnet::logthis("error creating student_table: ".
                    728:                                  &Apache::lonmysql::get_error());
                    729:         return 3;
                    730:     }
                    731:     #
                    732:     $tableid = &Apache::lonmysql::create_table($performance_table_def);
                    733:     if (! defined($tableid)) {
                    734:         &Apache::lonnet::logthis("error creating preformance_table: ".
                    735:                                  &Apache::lonmysql::get_error());
                    736:         return 5;
                    737:     }
                    738:     #
                    739:     $tableid = &Apache::lonmysql::create_table($parameters_table_def);
                    740:     if (! defined($tableid)) {
                    741:         &Apache::lonnet::logthis("error creating parameters_table: ".
                    742:                                  &Apache::lonmysql::get_error());
                    743:         return 6;
                    744:     }
1.89      matthew   745:     #
                    746:     $tableid = &Apache::lonmysql::create_table($fulldump_part_table_def);
                    747:     if (! defined($tableid)) {
                    748:         &Apache::lonnet::logthis("error creating fulldump_part_table: ".
                    749:                                  &Apache::lonmysql::get_error());
                    750:         return 7;
                    751:     }
                    752:     #
                    753:     $tableid = &Apache::lonmysql::create_table($fulldump_response_table_def);
                    754:     if (! defined($tableid)) {
                    755:         &Apache::lonnet::logthis("error creating fulldump_response_table: ".
                    756:                                  &Apache::lonmysql::get_error());
                    757:         return 8;
                    758:     }
                    759:     $tableid = &Apache::lonmysql::create_table($fulldump_timestamp_table_def);
                    760:     if (! defined($tableid)) {
                    761:         &Apache::lonnet::logthis("error creating fulldump_timestamp_table: ".
                    762:                                  &Apache::lonmysql::get_error());
                    763:         return 9;
                    764:     }
1.127     matthew   765:     $tableid = &Apache::lonmysql::create_table($weight_table_def);
                    766:     if (! defined($tableid)) {
                    767:         &Apache::lonnet::logthis("error creating weight_table: ".
                    768:                                  &Apache::lonmysql::get_error());
                    769:         return 10;
                    770:     }
1.57      matthew   771:     return 0;
1.70      matthew   772: }
                    773: 
                    774: ################################################
                    775: ################################################
                    776: 
                    777: =pod
                    778: 
                    779: =item &delete_caches()
                    780: 
                    781: =cut
                    782: 
                    783: ################################################
                    784: ################################################
                    785: sub delete_caches {
                    786:     my $courseid = shift;
                    787:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                    788:     #
                    789:     &setup_table_names($courseid);
                    790:     #
                    791:     my $dbh = &Apache::lonmysql::get_dbh();
1.89      matthew   792:     foreach my $table (@Tables) {
1.70      matthew   793:         my $command = 'DROP TABLE '.$table.';';
                    794:         $dbh->do($command);
                    795:         if ($dbh->err) {
                    796:             &Apache::lonnet::logthis($command.' resulted in error: '.$dbh->errstr);
                    797:         }
                    798:     }
                    799:     return;
1.57      matthew   800: }
                    801: 
                    802: ################################################
                    803: ################################################
                    804: 
                    805: =pod
                    806: 
                    807: =item &get_part_id()
                    808: 
                    809: Get the MySQL id of a problem part string.
                    810: 
                    811: Input: $part
                    812: 
                    813: Output: undef on error, integer $part_id on success.
                    814: 
                    815: =item &get_part()
                    816: 
                    817: Get the string describing a part from the MySQL id of the problem part.
                    818: 
                    819: Input: $part_id
                    820: 
                    821: Output: undef on error, $part string on success.
                    822: 
                    823: =cut
                    824: 
                    825: ################################################
                    826: ################################################
                    827: 
1.61      matthew   828: my $have_read_part_table = 0;
1.57      matthew   829: my %ids_by_part;
                    830: my %parts_by_id;
                    831: 
                    832: sub get_part_id {
                    833:     my ($part) = @_;
1.61      matthew   834:     $part = 0 if (! defined($part));
                    835:     if (! $have_read_part_table) {
                    836:         my @Result = &Apache::lonmysql::get_rows($part_table);
                    837:         foreach (@Result) {
                    838:             $ids_by_part{$_->[1]}=$_->[0];
                    839:         }
                    840:         $have_read_part_table = 1;
                    841:     }
1.57      matthew   842:     if (! exists($ids_by_part{$part})) {
                    843:         &Apache::lonmysql::store_row($part_table,[undef,$part]);
                    844:         undef(%ids_by_part);
                    845:         my @Result = &Apache::lonmysql::get_rows($part_table);
                    846:         foreach (@Result) {
                    847:             $ids_by_part{$_->[1]}=$_->[0];
                    848:         }
                    849:     }
                    850:     return $ids_by_part{$part} if (exists($ids_by_part{$part}));
                    851:     return undef; # error
                    852: }
                    853: 
                    854: sub get_part {
                    855:     my ($part_id) = @_;
                    856:     if (! exists($parts_by_id{$part_id})  || 
                    857:         ! defined($parts_by_id{$part_id}) ||
                    858:         $parts_by_id{$part_id} eq '') {
                    859:         my @Result = &Apache::lonmysql::get_rows($part_table);
                    860:         foreach (@Result) {
                    861:             $parts_by_id{$_->[0]}=$_->[1];
                    862:         }
                    863:     }
                    864:     return $parts_by_id{$part_id} if(exists($parts_by_id{$part_id}));
                    865:     return undef; # error
                    866: }
                    867: 
                    868: ################################################
                    869: ################################################
                    870: 
                    871: =pod
                    872: 
                    873: =item &get_symb_id()
                    874: 
                    875: Get the MySQL id of a symb.
                    876: 
                    877: Input: $symb
                    878: 
                    879: Output: undef on error, integer $symb_id on success.
                    880: 
                    881: =item &get_symb()
                    882: 
                    883: Get the symb associated with a MySQL symb_id.
                    884: 
                    885: Input: $symb_id
                    886: 
                    887: Output: undef on error, $symb on success.
                    888: 
                    889: =cut
                    890: 
                    891: ################################################
                    892: ################################################
                    893: 
1.61      matthew   894: my $have_read_symb_table = 0;
1.57      matthew   895: my %ids_by_symb;
                    896: my %symbs_by_id;
                    897: 
                    898: sub get_symb_id {
                    899:     my ($symb) = @_;
1.61      matthew   900:     if (! $have_read_symb_table) {
                    901:         my @Result = &Apache::lonmysql::get_rows($symb_table);
                    902:         foreach (@Result) {
                    903:             $ids_by_symb{$_->[1]}=$_->[0];
                    904:         }
                    905:         $have_read_symb_table = 1;
                    906:     }
1.57      matthew   907:     if (! exists($ids_by_symb{$symb})) {
                    908:         &Apache::lonmysql::store_row($symb_table,[undef,$symb]);
                    909:         undef(%ids_by_symb);
                    910:         my @Result = &Apache::lonmysql::get_rows($symb_table);
                    911:         foreach (@Result) {
                    912:             $ids_by_symb{$_->[1]}=$_->[0];
                    913:         }
                    914:     }
                    915:     return $ids_by_symb{$symb} if(exists( $ids_by_symb{$symb}));
                    916:     return undef; # error
                    917: }
                    918: 
                    919: sub get_symb {
                    920:     my ($symb_id) = @_;
                    921:     if (! exists($symbs_by_id{$symb_id})  || 
                    922:         ! defined($symbs_by_id{$symb_id}) ||
                    923:         $symbs_by_id{$symb_id} eq '') {
                    924:         my @Result = &Apache::lonmysql::get_rows($symb_table);
                    925:         foreach (@Result) {
                    926:             $symbs_by_id{$_->[0]}=$_->[1];
                    927:         }
                    928:     }
                    929:     return $symbs_by_id{$symb_id} if(exists( $symbs_by_id{$symb_id}));
                    930:     return undef; # error
                    931: }
                    932: 
                    933: ################################################
                    934: ################################################
                    935: 
                    936: =pod
                    937: 
                    938: =item &get_student_id()
                    939: 
                    940: Get the MySQL id of a student.
                    941: 
                    942: Input: $sname, $dom
                    943: 
                    944: Output: undef on error, integer $student_id on success.
                    945: 
                    946: =item &get_student()
                    947: 
                    948: Get student username:domain associated with the MySQL student_id.
                    949: 
                    950: Input: $student_id
                    951: 
                    952: Output: undef on error, string $student (username:domain) on success.
                    953: 
                    954: =cut
                    955: 
                    956: ################################################
                    957: ################################################
                    958: 
1.61      matthew   959: my $have_read_student_table = 0;
1.57      matthew   960: my %ids_by_student;
                    961: my %students_by_id;
                    962: 
                    963: sub get_student_id {
                    964:     my ($sname,$sdom) = @_;
                    965:     my $student = $sname.':'.$sdom;
1.61      matthew   966:     if (! $have_read_student_table) {
                    967:         my @Result = &Apache::lonmysql::get_rows($student_table);
                    968:         foreach (@Result) {
                    969:             $ids_by_student{$_->[1]}=$_->[0];
                    970:         }
                    971:         $have_read_student_table = 1;
                    972:     }
1.57      matthew   973:     if (! exists($ids_by_student{$student})) {
1.113     matthew   974:         &populate_student_table();
1.57      matthew   975:         undef(%ids_by_student);
1.113     matthew   976:         undef(%students_by_id);
1.57      matthew   977:         my @Result = &Apache::lonmysql::get_rows($student_table);
                    978:         foreach (@Result) {
                    979:             $ids_by_student{$_->[1]}=$_->[0];
                    980:         }
                    981:     }
                    982:     return $ids_by_student{$student} if(exists( $ids_by_student{$student}));
                    983:     return undef; # error
                    984: }
                    985: 
                    986: sub get_student {
                    987:     my ($student_id) = @_;
                    988:     if (! exists($students_by_id{$student_id})  || 
                    989:         ! defined($students_by_id{$student_id}) ||
                    990:         $students_by_id{$student_id} eq '') {
                    991:         my @Result = &Apache::lonmysql::get_rows($student_table);
                    992:         foreach (@Result) {
                    993:             $students_by_id{$_->[0]}=$_->[1];
                    994:         }
                    995:     }
                    996:     return $students_by_id{$student_id} if(exists($students_by_id{$student_id}));
                    997:     return undef; # error
                    998: }
1.99      matthew   999: 
1.113     matthew  1000: sub populate_student_table {
                   1001:     my ($courseid) = @_;
                   1002:     if (! defined($courseid)) {
                   1003:         $courseid = $ENV{'request.course.id'};
                   1004:     }
                   1005:     #
                   1006:     &setup_table_names($courseid);
1.134     matthew  1007:     &init_dbs($courseid,0);
1.113     matthew  1008:     my $dbh = &Apache::lonmysql::get_dbh();
                   1009:     my $request = 'INSERT IGNORE INTO '.$student_table.
                   1010:         "(student,section,status) VALUES ";
                   1011:     my $classlist = &get_classlist($courseid);
                   1012:     my $student_count=0;
                   1013:     while (my ($student,$data) = each %$classlist) {
                   1014:         my ($section,$status) = ($data->[&CL_SECTION()],
                   1015:                                  $data->[&CL_STATUS()]);
                   1016:         if ($section eq '' || $section =~ /^\s*$/) {
                   1017:             $section = 'none';
                   1018:         }
                   1019:         $request .= "('".$student."','".$section."','".$status."'),";
                   1020:         $student_count++;
                   1021:     }
                   1022:     return if ($student_count == 0);
                   1023:     chop($request);
                   1024:     $dbh->do($request);
                   1025:     if ($dbh->err()) {
                   1026:         &Apache::lonnet::logthis("error ".$dbh->errstr().
                   1027:                                  " occured executing \n".
                   1028:                                  $request);
                   1029:     }
                   1030:     return;
                   1031: }
                   1032: 
1.99      matthew  1033: ################################################
                   1034: ################################################
                   1035: 
                   1036: =pod
                   1037: 
                   1038: =item &clear_internal_caches()
                   1039: 
                   1040: Causes the internal caches used in get_student_id, get_student,
                   1041: get_symb_id, get_symb, get_part_id, and get_part to be undef'd.
                   1042: 
                   1043: Needs to be called before the first operation with the MySQL database
                   1044: for a given Apache request.
                   1045: 
                   1046: =cut
                   1047: 
                   1048: ################################################
                   1049: ################################################
                   1050: sub clear_internal_caches {
                   1051:     $have_read_part_table = 0;
                   1052:     undef(%ids_by_part);
                   1053:     undef(%parts_by_id);
                   1054:     $have_read_symb_table = 0;
                   1055:     undef(%ids_by_symb);
                   1056:     undef(%symbs_by_id);
                   1057:     $have_read_student_table = 0;
                   1058:     undef(%ids_by_student);
                   1059:     undef(%students_by_id);
                   1060: }
                   1061: 
1.57      matthew  1062: 
                   1063: ################################################
                   1064: ################################################
                   1065: 
                   1066: =pod
                   1067: 
1.89      matthew  1068: =item &update_full_student_data($sname,$sdom,$courseid)
                   1069: 
                   1070: Does a lonnet::dump on a student to populate the courses tables.
                   1071: 
                   1072: Input: $sname, $sdom, $courseid
                   1073: 
                   1074: Output: $returnstatus
                   1075: 
                   1076: $returnstatus is a string describing any errors that occured.  'okay' is the
                   1077: default.
                   1078: 
                   1079: This subroutine loads a students data using lonnet::dump and inserts
                   1080: it into the MySQL database.  The inserts are done on three tables, 
                   1081: $fulldump_response_table, $fulldump_part_table, and $fulldump_timestamp_table.
                   1082: The INSERT calls are made directly by this subroutine, not through lonmysql 
                   1083: because we do a 'bulk'insert which takes advantage of MySQLs non-SQL 
                   1084: compliant INSERT command to insert multiple rows at a time.  
                   1085: If anything has gone wrong during this process, $returnstatus is updated with 
                   1086: a description of the error.
                   1087: 
                   1088: Once the "fulldump" tables are updated, the tables used for chart and
                   1089: spreadsheet (which hold only the current state of the student on their
                   1090: homework, not historical data) are updated.  If all updates have occured 
1.113     matthew  1091: successfully, $student_table is updated to reflect the time of the update.
1.89      matthew  1092: 
                   1093: Notice we do not insert the data and immediately query it.  This means it
                   1094: is possible for there to be data returned this first time that is not 
                   1095: available the second time.  CYA.
                   1096: 
                   1097: =cut
                   1098: 
                   1099: ################################################
                   1100: ################################################
                   1101: sub update_full_student_data {
                   1102:     my ($sname,$sdom,$courseid) = @_;
                   1103:     #
                   1104:     # Set up database names
                   1105:     &setup_table_names($courseid);
                   1106:     #
                   1107:     my $student_id = &get_student_id($sname,$sdom);
                   1108:     my $student = $sname.':'.$sdom;
                   1109:     #
                   1110:     my $returnstatus = 'okay';
                   1111:     #
                   1112:     # Download students data
                   1113:     my $time_of_retrieval = time;
                   1114:     my @tmp = &Apache::lonnet::dump($courseid,$sdom,$sname);
                   1115:     if (@tmp && $tmp[0] =~ /^error/) {
                   1116:         $returnstatus = 'error retrieving full student data';
                   1117:         return $returnstatus;
                   1118:     } elsif (! @tmp) {
                   1119:         $returnstatus = 'okay: no student data';
                   1120:         return $returnstatus;
                   1121:     }
                   1122:     my %studentdata = @tmp;
                   1123:     #
                   1124:     # Get database handle and clean out the tables 
                   1125:     my $dbh = &Apache::lonmysql::get_dbh();
                   1126:     $dbh->do('DELETE FROM '.$fulldump_response_table.' WHERE student_id='.
                   1127:              $student_id);
                   1128:     $dbh->do('DELETE FROM '.$fulldump_part_table.' WHERE student_id='.
                   1129:              $student_id);
                   1130:     $dbh->do('DELETE FROM '.$fulldump_timestamp_table.' WHERE student_id='.
                   1131:              $student_id);
                   1132:     #
                   1133:     # Parse and store the data into a form we can handle
                   1134:     my $partdata;
                   1135:     my $respdata;
                   1136:     while (my ($key,$value) = each(%studentdata)) {
                   1137:         next if ($key =~ /^(\d+):(resource$|subnum$|keys:)/);
                   1138:         my ($transaction,$symb,$parameter) = split(':',$key);
                   1139:         my $symb_id = &get_symb_id($symb);
                   1140:         if ($parameter eq 'timestamp') {
                   1141:             # We can deal with 'timestamp' right away
                   1142:             my @timestamp_storage = ($symb_id,$student_id,
                   1143:                                      $transaction,$value);
1.98      matthew  1144:             my $store_command = 'INSERT IGNORE INTO '.$fulldump_timestamp_table.
1.89      matthew  1145:                 " VALUES ('".join("','",@timestamp_storage)."');";
                   1146:             $dbh->do($store_command);
                   1147:             if ($dbh->err()) {
                   1148:                 &Apache::lonnet::logthis('unable to execute '.$store_command);
                   1149:                 &Apache::lonnet::logthis($dbh->errstr());
                   1150:             }
                   1151:             next;
                   1152:         } elsif ($parameter eq 'version') {
                   1153:             next;
1.90      matthew  1154:         } elsif ($parameter =~ /^resource\.(.*)\.(tries|
                   1155:                                                   award|
                   1156:                                                   awarded|
                   1157:                                                   previous|
                   1158:                                                   solved|
                   1159:                                                   awarddetail|
                   1160:                                                   submission|
                   1161:                                                   submissiongrading|
                   1162:                                                   molecule)\s*$/x){
1.89      matthew  1163:             # we do not have enough information to store an 
                   1164:             # entire row, so we save it up until later.
                   1165:             my ($part_and_resp_id,$field) = ($1,$2);
                   1166:             my ($part,$part_id,$resp,$resp_id);
                   1167:             if ($part_and_resp_id =~ /\./) {
                   1168:                 ($part,$resp) = split(/\./,$part_and_resp_id);
                   1169:                 $part_id = &get_part_id($part);
                   1170:                 $resp_id = &get_part_id($resp);
                   1171:             } else {
                   1172:                 $part_id = &get_part_id($part_and_resp_id);
                   1173:             }
1.90      matthew  1174:             # Deal with part specific data
1.89      matthew  1175:             if ($field =~ /^(tries|award|awarded|previous)$/) {
                   1176:                 $partdata->{$symb_id}->{$part_id}->{$transaction}->{$field}=$value;
                   1177:             }
1.90      matthew  1178:             # deal with response specific data
1.89      matthew  1179:             if (defined($resp_id) &&
1.100     matthew  1180:                 $field =~ /^(awarddetail|
1.90      matthew  1181:                              submission|
                   1182:                              submissiongrading|
                   1183:                              molecule)$/x) {
1.89      matthew  1184:                 if ($field eq 'submission') {
                   1185:                     # We have to be careful with user supplied input.
                   1186:                     # most of the time we are okay because it is escaped.
                   1187:                     # However, there is one wrinkle: submissions which end in
                   1188:                     # and odd number of '\' cause insert errors to occur.  
                   1189:                     # Best trap this somehow...
1.116     matthew  1190:                     $value = $dbh->quote($value);
1.89      matthew  1191:                 }
1.90      matthew  1192:                 if ($field eq 'submissiongrading' || 
                   1193:                     $field eq 'molecule') {
                   1194:                     $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific'}=$field;
                   1195:                     $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{'response_specific_value'}=$value;
                   1196:                 } else {
                   1197:                     $respdata->{$symb_id}->{$part_id}->{$resp_id}->{$transaction}->{$field}=$value;
                   1198:                 }
1.89      matthew  1199:             }
                   1200:         }
                   1201:     }
                   1202:     ##
                   1203:     ## Store the part data
1.98      matthew  1204:     my $store_command = 'INSERT IGNORE INTO '.$fulldump_part_table.
1.89      matthew  1205:         ' VALUES '."\n";
                   1206:     my $store_rows = 0;
                   1207:     while (my ($symb_id,$hash1) = each (%$partdata)) {
                   1208:         while (my ($part_id,$hash2) = each (%$hash1)) {
                   1209:             while (my ($transaction,$data) = each (%$hash2)) {
                   1210:                 $store_command .= "('".join("','",$symb_id,$part_id,
                   1211:                                             $student_id,
                   1212:                                             $transaction,
1.101     matthew  1213:                                             $data->{'tries'},
1.89      matthew  1214:                                             $data->{'award'},
                   1215:                                             $data->{'awarded'},
                   1216:                                             $data->{'previous'})."'),";
                   1217:                 $store_rows++;
                   1218:             }
                   1219:         }
                   1220:     }
                   1221:     if ($store_rows) {
                   1222:         chop($store_command);
                   1223:         $dbh->do($store_command);
                   1224:         if ($dbh->err) {
                   1225:             $returnstatus = 'error storing part data';
                   1226:             &Apache::lonnet::logthis('insert error '.$dbh->errstr());
                   1227:             &Apache::lonnet::logthis("While attempting\n".$store_command);
                   1228:         }
                   1229:     }
                   1230:     ##
                   1231:     ## Store the response data
1.98      matthew  1232:     $store_command = 'INSERT IGNORE INTO '.$fulldump_response_table.
1.89      matthew  1233:         ' VALUES '."\n";
                   1234:     $store_rows = 0;
                   1235:     while (my ($symb_id,$hash1) = each (%$respdata)) {
                   1236:         while (my ($part_id,$hash2) = each (%$hash1)) {
                   1237:             while (my ($resp_id,$hash3) = each (%$hash2)) {
                   1238:                 while (my ($transaction,$data) = each (%$hash3)) {
1.112     matthew  1239:                     my $submission = $data->{'submission'};
                   1240:                     # We have to be careful with user supplied input.
                   1241:                     # most of the time we are okay because it is escaped.
                   1242:                     # However, there is one wrinkle: submissions which end in
                   1243:                     # and odd number of '\' cause insert errors to occur.  
                   1244:                     # Best trap this somehow...
                   1245:                     $submission = $dbh->quote($submission);
                   1246:                     $store_command .= "('".
                   1247:                         join("','",$symb_id,$part_id,
                   1248:                              $resp_id,$student_id,
                   1249:                              $transaction,
                   1250:                              $data->{'awarddetail'},
                   1251:                              $data->{'response_specific'},
                   1252:                              $data->{'response_specific_value'}).
                   1253:                              "',".$submission."),";
1.89      matthew  1254:                     $store_rows++;
                   1255:                 }
                   1256:             }
                   1257:         }
                   1258:     }
                   1259:     if ($store_rows) {
                   1260:         chop($store_command);
                   1261:         $dbh->do($store_command);
                   1262:         if ($dbh->err) {
                   1263:             $returnstatus = 'error storing response data';
                   1264:             &Apache::lonnet::logthis('insert error '.$dbh->errstr());
                   1265:             &Apache::lonnet::logthis("While attempting\n".$store_command);
                   1266:         }
                   1267:     }
                   1268:     ##
                   1269:     ## Update the students "current" data in the performance 
                   1270:     ## and parameters tables.
                   1271:     my ($status,undef) = &store_student_data
                   1272:         ($sname,$sdom,$courseid,
                   1273:          &Apache::lonnet::convert_dump_to_currentdump(\%studentdata));
                   1274:     if ($returnstatus eq 'okay' && $status ne 'okay') {
                   1275:         $returnstatus = 'error storing current data:'.$status;
                   1276:     } elsif ($status ne 'okay') {
                   1277:         $returnstatus .= ' error storing current data:'.$status;
                   1278:     }        
                   1279:     ##
                   1280:     ## Update the students time......
                   1281:     if ($returnstatus eq 'okay') {
1.113     matthew  1282:         &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
                   1283:         if ($dbh->err) {
                   1284:             if ($returnstatus eq 'okay') {
                   1285:                 $returnstatus = 'error updating student time';
                   1286:             } else {
                   1287:                 $returnstatus = 'error updating student time';
                   1288:             }
                   1289:         }
1.89      matthew  1290:     }
                   1291:     return $returnstatus;
                   1292: }
                   1293: 
                   1294: ################################################
                   1295: ################################################
                   1296: 
                   1297: =pod
                   1298: 
1.57      matthew  1299: =item &update_student_data()
                   1300: 
                   1301: Input: $sname, $sdom, $courseid
                   1302: 
                   1303: Output: $returnstatus, \%student_data
                   1304: 
                   1305: $returnstatus is a string describing any errors that occured.  'okay' is the
                   1306: default.
                   1307: \%student_data is the data returned by a call to lonnet::currentdump.
                   1308: 
                   1309: This subroutine loads a students data using lonnet::currentdump and inserts
                   1310: it into the MySQL database.  The inserts are done on two tables, 
                   1311: $performance_table and $parameters_table.  $parameters_table holds the data 
                   1312: that is not included in $performance_table.  See the description of 
                   1313: $performance_table elsewhere in this file.  The INSERT calls are made
                   1314: directly by this subroutine, not through lonmysql because we do a 'bulk'
                   1315: insert which takes advantage of MySQLs non-SQL compliant INSERT command to 
                   1316: insert multiple rows at a time.  If anything has gone wrong during this
                   1317: process, $returnstatus is updated with a description of the error and
                   1318: \%student_data is returned.  
                   1319: 
                   1320: Notice we do not insert the data and immediately query it.  This means it
                   1321: is possible for there to be data returned this first time that is not 
                   1322: available the second time.  CYA.
                   1323: 
                   1324: =cut
                   1325: 
                   1326: ################################################
                   1327: ################################################
                   1328: sub update_student_data {
                   1329:     my ($sname,$sdom,$courseid) = @_;
                   1330:     #
1.60      matthew  1331:     # Set up database names
                   1332:     &setup_table_names($courseid);
                   1333:     #
1.57      matthew  1334:     my $student_id = &get_student_id($sname,$sdom);
                   1335:     my $student = $sname.':'.$sdom;
                   1336:     #
                   1337:     my $returnstatus = 'okay';
                   1338:     #
                   1339:     # Download students data
                   1340:     my $time_of_retrieval = time;
                   1341:     my @tmp = &Apache::lonnet::currentdump($courseid,$sdom,$sname);
                   1342:     if ((scalar(@tmp) > 0) && ($tmp[0] =~ /^error:/)) {
                   1343:         &Apache::lonnet::logthis('error getting data for '.
                   1344:                                  $sname.':'.$sdom.' in course '.$courseid.
                   1345:                                  ':'.$tmp[0]);
                   1346:         $returnstatus = 'error getting data';
1.79      matthew  1347:         return ($returnstatus,undef);
1.57      matthew  1348:     }
                   1349:     if (scalar(@tmp) < 1) {
                   1350:         return ('no data',undef);
                   1351:     }
                   1352:     my %student_data = @tmp;
1.89      matthew  1353:     my @Results = &store_student_data($sname,$sdom,$courseid,\%student_data);
                   1354:     #
                   1355:     # Set the students update time
1.96      matthew  1356:     if ($Results[0] eq 'okay') {
1.113     matthew  1357:         &store_updatetime($student_id,$time_of_retrieval,$time_of_retrieval);
1.95      matthew  1358:     }
1.89      matthew  1359:     #
                   1360:     return @Results;
                   1361: }
                   1362: 
1.113     matthew  1363: sub store_updatetime {
                   1364:     my ($student_id,$updatetime,$fullupdatetime)=@_;
                   1365:     my $values = '';
                   1366:     if (defined($updatetime)) {
                   1367:         $values = 'updatetime='.$updatetime.' ';
                   1368:     }
                   1369:     if (defined($fullupdatetime)) {
                   1370:         if ($values ne '') {
                   1371:             $values .= ',';
                   1372:         }
                   1373:         $values .= 'fullupdatetime='.$fullupdatetime.' ';
                   1374:     }
                   1375:     return if ($values eq '');
                   1376:     my $dbh = &Apache::lonmysql::get_dbh();
                   1377:     my $request = 'UPDATE '.$student_table.' SET '.$values.
                   1378:         ' WHERE student_id='.$student_id.' LIMIT 1';
                   1379:     $dbh->do($request);
                   1380: }
                   1381: 
1.89      matthew  1382: sub store_student_data {
                   1383:     my ($sname,$sdom,$courseid,$student_data) = @_;
                   1384:     #
                   1385:     my $student_id = &get_student_id($sname,$sdom);
                   1386:     my $student = $sname.':'.$sdom;
                   1387:     #
                   1388:     my $returnstatus = 'okay';
1.57      matthew  1389:     #
                   1390:     # Remove all of the students data from the table
1.60      matthew  1391:     my $dbh = &Apache::lonmysql::get_dbh();
                   1392:     $dbh->do('DELETE FROM '.$performance_table.' WHERE student_id='.
                   1393:              $student_id);
                   1394:     $dbh->do('DELETE FROM '.$parameters_table.' WHERE student_id='.
                   1395:              $student_id);
1.57      matthew  1396:     #
                   1397:     # Store away the data
                   1398:     #
                   1399:     my $starttime = Time::HiRes::time;
                   1400:     my $elapsed = 0;
                   1401:     my $rows_stored;
1.98      matthew  1402:     my $store_parameters_command  = 'INSERT IGNORE INTO '.$parameters_table.
1.60      matthew  1403:         ' VALUES '."\n";
1.61      matthew  1404:     my $num_parameters = 0;
1.98      matthew  1405:     my $store_performance_command = 'INSERT IGNORE INTO '.$performance_table.
1.60      matthew  1406:         ' VALUES '."\n";
1.79      matthew  1407:     return ('error',undef) if (! defined($dbh));
1.89      matthew  1408:     while (my ($current_symb,$param_hash) = each(%{$student_data})) {
1.57      matthew  1409:         #
                   1410:         # make sure the symb is set up properly
                   1411:         my $symb_id = &get_symb_id($current_symb);
                   1412:         #
                   1413:         # Load data into the tables
1.63      matthew  1414:         while (my ($parameter,$value) = each(%$param_hash)) {
1.57      matthew  1415:             my $newstring;
1.63      matthew  1416:             if ($parameter !~ /(timestamp|resource\.(.*)\.(solved|tries|awarded|award|awarddetail|previous))/) {
1.57      matthew  1417:                 $newstring = "('".join("','",
                   1418:                                        $symb_id,$student_id,
1.69      matthew  1419:                                        $parameter)."',".
                   1420:                                            $dbh->quote($value)."),\n";
1.61      matthew  1421:                 $num_parameters ++;
1.57      matthew  1422:                 if ($newstring !~ /''/) {
                   1423:                     $store_parameters_command .= $newstring;
                   1424:                     $rows_stored++;
                   1425:                 }
                   1426:             }
                   1427:             next if ($parameter !~ /^resource\.(.*)\.solved$/);
                   1428:             #
                   1429:             my $part = $1;
                   1430:             my $part_id = &get_part_id($part);
                   1431:             next if (!defined($part_id));
                   1432:             my $solved  = $value;
                   1433:             my $tries   = $param_hash->{'resource.'.$part.'.tries'};
                   1434:             my $awarded = $param_hash->{'resource.'.$part.'.awarded'};
                   1435:             my $award   = $param_hash->{'resource.'.$part.'.award'};
                   1436:             my $awarddetail = $param_hash->{'resource.'.$part.'.awarddetail'};
                   1437:             my $timestamp = $param_hash->{'timestamp'};
1.60      matthew  1438:             #
1.74      matthew  1439:             $solved      = '' if (! defined($solved));
1.57      matthew  1440:             $tries       = '' if (! defined($tries));
                   1441:             $awarded     = '' if (! defined($awarded));
                   1442:             $award       = '' if (! defined($award));
                   1443:             $awarddetail = '' if (! defined($awarddetail));
1.73      matthew  1444:             $newstring = "('".join("','",$symb_id,$student_id,$part_id,$part,
1.57      matthew  1445:                                    $solved,$tries,$awarded,$award,
1.63      matthew  1446:                                    $awarddetail,$timestamp)."'),\n";
1.57      matthew  1447:             $store_performance_command .= $newstring;
                   1448:             $rows_stored++;
                   1449:         }
                   1450:     }
                   1451:     chop $store_parameters_command;
1.60      matthew  1452:     chop $store_parameters_command;
                   1453:     chop $store_performance_command;
1.57      matthew  1454:     chop $store_performance_command;
                   1455:     my $start = Time::HiRes::time;
1.94      matthew  1456:     $dbh->do($store_performance_command);
                   1457:     if ($dbh->err()) {
                   1458:         &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
                   1459:         &Apache::lonnet::logthis('command = '.$store_performance_command);
                   1460:         $returnstatus = 'error: unable to insert performance into database';
                   1461:         return ($returnstatus,$student_data);
                   1462:     }
1.61      matthew  1463:     $dbh->do($store_parameters_command) if ($num_parameters>0);
1.57      matthew  1464:     if ($dbh->err()) {
                   1465:         &Apache::lonnet::logthis(' bigass insert error:'.$dbh->errstr());
1.61      matthew  1466:         &Apache::lonnet::logthis('command = '.$store_parameters_command);
1.87      matthew  1467:         &Apache::lonnet::logthis('rows_stored = '.$rows_stored);
                   1468:         &Apache::lonnet::logthis('student_id = '.$student_id);
1.57      matthew  1469:         $returnstatus = 'error: unable to insert parameters into database';
1.89      matthew  1470:         return ($returnstatus,$student_data);
1.57      matthew  1471:     }
                   1472:     $elapsed += Time::HiRes::time - $start;
1.89      matthew  1473:     return ($returnstatus,$student_data);
1.57      matthew  1474: }
                   1475: 
1.89      matthew  1476: ######################################
                   1477: ######################################
1.57      matthew  1478: 
                   1479: =pod
                   1480: 
1.89      matthew  1481: =item &ensure_tables_are_set_up($courseid)
1.57      matthew  1482: 
1.89      matthew  1483: Checks to be sure the MySQL tables for the given class are set up.
                   1484: If $courseid is omitted it will be obtained from the environment.
1.57      matthew  1485: 
1.89      matthew  1486: Returns nothing on success and 'error' on failure
1.57      matthew  1487: 
                   1488: =cut
                   1489: 
1.89      matthew  1490: ######################################
                   1491: ######################################
                   1492: sub ensure_tables_are_set_up {
                   1493:     my ($courseid) = @_;
1.61      matthew  1494:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   1495:     # 
                   1496:     # Clean out package variables
1.57      matthew  1497:     &setup_table_names($courseid);
                   1498:     #
                   1499:     # if the tables do not exist, make them
                   1500:     my @CurrentTable = &Apache::lonmysql::tables_in_db();
1.113     matthew  1501:     my ($found_symb,$found_student,$found_part,
1.89      matthew  1502:         $found_performance,$found_parameters,$found_fulldump_part,
1.127     matthew  1503:         $found_fulldump_response,$found_fulldump_timestamp,
                   1504:         $found_weight);
1.57      matthew  1505:     foreach (@CurrentTable) {
                   1506:         $found_symb        = 1 if ($_ eq $symb_table);
                   1507:         $found_student     = 1 if ($_ eq $student_table);
                   1508:         $found_part        = 1 if ($_ eq $part_table);
                   1509:         $found_performance = 1 if ($_ eq $performance_table);
                   1510:         $found_parameters  = 1 if ($_ eq $parameters_table);
1.89      matthew  1511:         $found_fulldump_part      = 1 if ($_ eq $fulldump_part_table);
                   1512:         $found_fulldump_response  = 1 if ($_ eq $fulldump_response_table);
                   1513:         $found_fulldump_timestamp = 1 if ($_ eq $fulldump_timestamp_table);
1.127     matthew  1514:         $found_weight      = 1 if ($_ eq $weight_table);
1.57      matthew  1515:     }
1.127     matthew  1516:     if (!$found_symb          || 
                   1517:         !$found_student       || !$found_part              ||
                   1518:         !$found_performance   || !$found_parameters        ||
1.89      matthew  1519:         !$found_fulldump_part || !$found_fulldump_response ||
1.127     matthew  1520:         !$found_fulldump_timestamp || !$found_weight ) {
1.134     matthew  1521:         if (&init_dbs($courseid,1)) {
1.89      matthew  1522:             return 'error';
1.57      matthew  1523:         }
                   1524:     }
1.89      matthew  1525: }
                   1526: 
                   1527: ################################################
                   1528: ################################################
                   1529: 
                   1530: =pod
                   1531: 
                   1532: =item &ensure_current_data()
                   1533: 
                   1534: Input: $sname, $sdom, $courseid
                   1535: 
                   1536: Output: $status, $data
                   1537: 
                   1538: This routine ensures the data for a given student is up to date.
1.113     matthew  1539: The $student_table is queried to determine the time of the last update.  
1.89      matthew  1540: If the students data is out of date, &update_student_data() is called.  
                   1541: The return values from the call to &update_student_data() are returned.
                   1542: 
                   1543: =cut
                   1544: 
                   1545: ################################################
                   1546: ################################################
                   1547: sub ensure_current_data {
                   1548:     my ($sname,$sdom,$courseid) = @_;
                   1549:     my $status = 'okay';   # return value
                   1550:     #
                   1551:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   1552:     &ensure_tables_are_set_up($courseid);
1.57      matthew  1553:     #
                   1554:     # Get the update time for the user
                   1555:     my $updatetime = 0;
1.60      matthew  1556:     my $modifiedtime = &Apache::lonnet::GetFileTimestamp
                   1557:         ($sdom,$sname,$courseid.'.db',
                   1558:          $Apache::lonnet::perlvar{'lonUsersDir'});
1.57      matthew  1559:     #
1.87      matthew  1560:     my $student_id = &get_student_id($sname,$sdom);
1.113     matthew  1561:     my @Result = &Apache::lonmysql::get_rows($student_table,
1.87      matthew  1562:                                              "student_id ='$student_id'");
1.57      matthew  1563:     my $data = undef;
                   1564:     if (@Result) {
1.113     matthew  1565:         $updatetime = $Result[0]->[5];  # Ack!  This is dumb!
1.57      matthew  1566:     }
                   1567:     if ($modifiedtime > $updatetime) {
                   1568:         ($status,$data) = &update_student_data($sname,$sdom,$courseid);
                   1569:     }
                   1570:     return ($status,$data);
                   1571: }
                   1572: 
                   1573: ################################################
                   1574: ################################################
                   1575: 
                   1576: =pod
                   1577: 
1.89      matthew  1578: =item &ensure_current_full_data($sname,$sdom,$courseid)
                   1579: 
                   1580: Input: $sname, $sdom, $courseid
                   1581: 
                   1582: Output: $status
                   1583: 
                   1584: This routine ensures the fulldata (the data from a lonnet::dump, not a
                   1585: lonnet::currentdump) for a given student is up to date.
1.113     matthew  1586: The $student_table is queried to determine the time of the last update.  
1.89      matthew  1587: If the students fulldata is out of date, &update_full_student_data() is
                   1588: called.  
                   1589: 
                   1590: The return value from the call to &update_full_student_data() is returned.
                   1591: 
                   1592: =cut
                   1593: 
                   1594: ################################################
                   1595: ################################################
                   1596: sub ensure_current_full_data {
                   1597:     my ($sname,$sdom,$courseid) = @_;
                   1598:     my $status = 'okay';   # return value
                   1599:     #
                   1600:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   1601:     &ensure_tables_are_set_up($courseid);
                   1602:     #
                   1603:     # Get the update time for the user
                   1604:     my $modifiedtime = &Apache::lonnet::GetFileTimestamp
                   1605:         ($sdom,$sname,$courseid.'.db',
                   1606:          $Apache::lonnet::perlvar{'lonUsersDir'});
                   1607:     #
                   1608:     my $student_id = &get_student_id($sname,$sdom);
1.113     matthew  1609:     my @Result = &Apache::lonmysql::get_rows($student_table,
1.89      matthew  1610:                                              "student_id ='$student_id'");
                   1611:     my $updatetime;
                   1612:     if (@Result && ref($Result[0]) eq 'ARRAY') {
1.113     matthew  1613:         $updatetime = $Result[0]->[6];
1.89      matthew  1614:     }
                   1615:     if (! defined($updatetime) || $modifiedtime > $updatetime) {
                   1616:         $status = &update_full_student_data($sname,$sdom,$courseid);
                   1617:     }
                   1618:     return $status;
                   1619: }
                   1620: 
                   1621: ################################################
                   1622: ################################################
                   1623: 
                   1624: =pod
                   1625: 
1.57      matthew  1626: =item &get_student_data_from_performance_cache()
                   1627: 
                   1628: Input: $sname, $sdom, $symb, $courseid
                   1629: 
                   1630: Output: hash reference containing the data for the given student.
                   1631: If $symb is undef, all the students data is returned.
                   1632: 
                   1633: This routine is the heart of the local caching system.  See the description
                   1634: of $performance_table, $symb_table, $student_table, and $part_table.  The
                   1635: main task is building the MySQL request.  The tables appear in the request
                   1636: in the order in which they should be parsed by MySQL.  When searching
                   1637: on a student the $student_table is used to locate the 'student_id'.  All
                   1638: rows in $performance_table which have a matching 'student_id' are returned,
                   1639: with data from $part_table and $symb_table which match the entries in
                   1640: $performance_table, 'part_id' and 'symb_id'.  When searching on a symb,
                   1641: the $symb_table is processed first, with matching rows grabbed from 
                   1642: $performance_table and filled in from $part_table and $student_table in
                   1643: that order.  
                   1644: 
                   1645: Running 'EXPLAIN ' on the 'SELECT' statements generated can be quite 
                   1646: interesting, especially if you play with the order the tables are listed.  
                   1647: 
                   1648: =cut
                   1649: 
                   1650: ################################################
                   1651: ################################################
                   1652: sub get_student_data_from_performance_cache {
                   1653:     my ($sname,$sdom,$symb,$courseid)=@_;
                   1654:     my $student = $sname.':'.$sdom if (defined($sname) && defined($sdom));
1.61      matthew  1655:     &setup_table_names($courseid);
1.57      matthew  1656:     #
                   1657:     # Return hash
                   1658:     my $studentdata;
                   1659:     #
                   1660:     my $dbh = &Apache::lonmysql::get_dbh();
                   1661:     my $request = "SELECT ".
1.73      matthew  1662:         "d.symb,a.part,a.solved,a.tries,a.awarded,a.award,a.awarddetail,".
1.63      matthew  1663:             "a.timestamp ";
1.57      matthew  1664:     if (defined($student)) {
                   1665:         $request .= "FROM $student_table AS b ".
                   1666:             "LEFT JOIN $performance_table AS a ON b.student_id=a.student_id ".
1.73      matthew  1667: #            "LEFT JOIN $part_table AS c ON c.part_id = a.part_id ".
1.57      matthew  1668:             "LEFT JOIN $symb_table AS d ON d.symb_id = a.symb_id ".
                   1669:                 "WHERE student='$student'";
                   1670:         if (defined($symb) && $symb ne '') {
1.67      matthew  1671:             $request .= " AND d.symb=".$dbh->quote($symb);
1.57      matthew  1672:         }
                   1673:     } elsif (defined($symb) && $symb ne '') {
                   1674:         $request .= "FROM $symb_table as d ".
                   1675:             "LEFT JOIN $performance_table AS a ON d.symb_id=a.symb_id ".
1.73      matthew  1676: #            "LEFT JOIN $part_table    AS c ON c.part_id = a.part_id ".
1.57      matthew  1677:             "LEFT JOIN $student_table AS b ON b.student_id = a.student_id ".
                   1678:                 "WHERE symb='".$dbh->quote($symb)."'";
                   1679:     }
                   1680:     my $starttime = Time::HiRes::time;
                   1681:     my $rows_retrieved = 0;
                   1682:     my $sth = $dbh->prepare($request);
                   1683:     $sth->execute();
                   1684:     if ($sth->err()) {
                   1685:         &Apache::lonnet::logthis("Unable to execute MySQL request:");
                   1686:         &Apache::lonnet::logthis("\n".$request."\n");
                   1687:         &Apache::lonnet::logthis("error is:".$sth->errstr());
                   1688:         return undef;
                   1689:     }
                   1690:     foreach my $row (@{$sth->fetchall_arrayref}) {
                   1691:         $rows_retrieved++;
1.63      matthew  1692:         my ($symb,$part,$solved,$tries,$awarded,$award,$awarddetail,$time) = 
1.57      matthew  1693:             (@$row);
                   1694:         my $base = 'resource.'.$part;
                   1695:         $studentdata->{$symb}->{$base.'.solved'}  = $solved;
                   1696:         $studentdata->{$symb}->{$base.'.tries'}   = $tries;
                   1697:         $studentdata->{$symb}->{$base.'.awarded'} = $awarded;
                   1698:         $studentdata->{$symb}->{$base.'.award'}   = $award;
                   1699:         $studentdata->{$symb}->{$base.'.awarddetail'} = $awarddetail;
                   1700:         $studentdata->{$symb}->{'timestamp'} = $time if (defined($time) && $time ne '');
1.67      matthew  1701:     }
1.97      matthew  1702:     ## Get misc parameters
                   1703:     $request = 'SELECT c.symb,a.parameter,a.value '.
                   1704:         "FROM $student_table AS b ".
                   1705:         "LEFT JOIN $parameters_table AS a ON b.student_id=a.student_id ".
                   1706:         "LEFT JOIN $symb_table AS c ON c.symb_id = a.symb_id ".
                   1707:         "WHERE student='$student'";
                   1708:     if (defined($symb) && $symb ne '') {
                   1709:         $request .= " AND c.symb=".$dbh->quote($symb);
                   1710:     }
                   1711:     $sth = $dbh->prepare($request);
                   1712:     $sth->execute();
                   1713:     if ($sth->err()) {
                   1714:         &Apache::lonnet::logthis("Unable to execute MySQL request:");
                   1715:         &Apache::lonnet::logthis("\n".$request."\n");
                   1716:         &Apache::lonnet::logthis("error is:".$sth->errstr());
                   1717:         if (defined($symb) && $symb ne '') {
                   1718:             $studentdata = $studentdata->{$symb};
                   1719:         }
                   1720:         return $studentdata;
                   1721:     }
                   1722:     #
                   1723:     foreach my $row (@{$sth->fetchall_arrayref}) {
                   1724:         $rows_retrieved++;
                   1725:         my ($symb,$parameter,$value) = (@$row);
                   1726:         $studentdata->{$symb}->{$parameter}  = $value;
                   1727:     }
                   1728:     #
1.67      matthew  1729:     if (defined($symb) && $symb ne '') {
                   1730:         $studentdata = $studentdata->{$symb};
1.57      matthew  1731:     }
                   1732:     return $studentdata;
                   1733: }
                   1734: 
                   1735: ################################################
                   1736: ################################################
                   1737: 
                   1738: =pod
                   1739: 
                   1740: =item &get_current_state()
                   1741: 
                   1742: Input: $sname,$sdom,$symb,$courseid
                   1743: 
                   1744: Output: Described below
1.46      matthew  1745: 
1.47      matthew  1746: Retrieve the current status of a students performance.  $sname and
1.46      matthew  1747: $sdom are the only required parameters.  If $symb is undef the results
1.47      matthew  1748: of an &Apache::lonnet::currentdump() will be returned.  
1.46      matthew  1749: If $courseid is undef it will be retrieved from the environment.
                   1750: 
                   1751: The return structure is based on &Apache::lonnet::currentdump.  If
                   1752: $symb is unspecified, all the students data is returned in a hash of
                   1753: the form:
                   1754: ( 
                   1755:   symb1 => { param1 => value1, param2 => value2 ... },
                   1756:   symb2 => { param1 => value1, param2 => value2 ... },
                   1757: )
                   1758: 
                   1759: If $symb is specified, a hash of 
                   1760: (
                   1761:   param1 => value1, 
                   1762:   param2 => value2,
                   1763: )
                   1764: is returned.
                   1765: 
1.57      matthew  1766: If no data is found for $symb, or if the student has no performance data,
1.46      matthew  1767: an empty list is returned.
                   1768: 
                   1769: =cut
                   1770: 
                   1771: ################################################
                   1772: ################################################
                   1773: sub get_current_state {
1.47      matthew  1774:     my ($sname,$sdom,$symb,$courseid,$forcedownload)=@_;
                   1775:     #
1.46      matthew  1776:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
1.47      matthew  1777:     #
1.61      matthew  1778:     return () if (! defined($sname) || ! defined($sdom));
                   1779:     #
1.57      matthew  1780:     my ($status,$data) = &ensure_current_data($sname,$sdom,$courseid);
1.77      matthew  1781: #    &Apache::lonnet::logthis
                   1782: #        ('sname = '.$sname.
                   1783: #         ' domain = '.$sdom.
                   1784: #         ' status = '.$status.
                   1785: #         ' data is '.(defined($data)?'defined':'undefined'));
1.73      matthew  1786: #    while (my ($symb,$hash) = each(%$data)) {
                   1787: #        &Apache::lonnet::logthis($symb."\n----------------------------------");
                   1788: #        while (my ($key,$value) = each (%$hash)) {
                   1789: #            &Apache::lonnet::logthis("   ".$key." = ".$value);
                   1790: #        }
                   1791: #    }
1.47      matthew  1792:     #
1.79      matthew  1793:     if (defined($data) && defined($symb) && ref($data->{$symb})) {
                   1794:         return %{$data->{$symb}};
                   1795:     } elsif (defined($data) && ! defined($symb) && ref($data)) {
                   1796:         return %$data;
                   1797:     } 
                   1798:     if ($status eq 'no data') {
1.57      matthew  1799:         return ();
                   1800:     } else {
                   1801:         if ($status ne 'okay' && $status ne '') {
                   1802:             &Apache::lonnet::logthis('status = '.$status);
1.47      matthew  1803:             return ();
                   1804:         }
1.57      matthew  1805:         my $returnhash = &get_student_data_from_performance_cache($sname,$sdom,
                   1806:                                                       $symb,$courseid);
                   1807:         return %$returnhash if (defined($returnhash));
1.46      matthew  1808:     }
1.57      matthew  1809:     return ();
1.61      matthew  1810: }
                   1811: 
                   1812: ################################################
                   1813: ################################################
                   1814: 
                   1815: =pod
                   1816: 
                   1817: =item &get_problem_statistics()
                   1818: 
                   1819: Gather data on a given problem.  The database is assumed to be 
                   1820: populated and all local caching variables are assumed to be set
                   1821: properly.  This means you need to call &ensure_current_data for
                   1822: the students you are concerned with prior to calling this routine.
                   1823: 
1.124     matthew  1824: Inputs: $Sections, $status, $symb, $part, $courseid, $starttime, $endtime
1.61      matthew  1825: 
1.64      matthew  1826: =over 4
                   1827: 
1.124     matthew  1828: =item $Sections Array ref containing section names for students.  
                   1829: 'all' is allowed to be the first (and only) item in the array.
                   1830: 
                   1831: =item $status String describing the status of students
1.64      matthew  1832: 
                   1833: =item $symb is the symb for the problem.
                   1834: 
                   1835: =item $part is the part id you need statistics for
                   1836: 
                   1837: =item $courseid is the course id, of course!
                   1838: 
1.122     matthew  1839: =item $starttime and $endtime are unix times which to use to limit
                   1840: the statistical data.
                   1841: 
1.64      matthew  1842: =back
                   1843: 
1.66      matthew  1844: Outputs: See the code for up to date information.  A hash reference is
                   1845: returned.  The hash has the following keys defined:
1.64      matthew  1846: 
                   1847: =over 4
                   1848: 
1.66      matthew  1849: =item num_students The number of students attempting the problem
                   1850:       
                   1851: =item tries The total number of tries for the students
                   1852:       
                   1853: =item max_tries The maximum number of tries taken
                   1854:       
                   1855: =item mean_tries The average number of tries
                   1856:       
                   1857: =item num_solved The number of students able to solve the problem
                   1858:       
                   1859: =item num_override The number of students whose answer is 'correct_by_override'
                   1860:       
                   1861: =item deg_of_diff The degree of difficulty of the problem
                   1862:       
                   1863: =item std_tries The standard deviation of the number of tries
                   1864:       
                   1865: =item skew_tries The skew of the number of tries
1.64      matthew  1866: 
1.66      matthew  1867: =item per_wrong The number of students attempting the problem who were not
                   1868: able to answer it correctly.
1.64      matthew  1869: 
                   1870: =back
                   1871: 
1.61      matthew  1872: =cut
                   1873: 
                   1874: ################################################
                   1875: ################################################
                   1876: sub get_problem_statistics {
1.122     matthew  1877:     my ($Sections,$status,$symb,$part,$courseid,$starttime,$endtime) = @_;
1.61      matthew  1878:     return if (! defined($symb) || ! defined($part));
                   1879:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   1880:     #
1.100     matthew  1881:     &setup_table_names($courseid);
1.61      matthew  1882:     my $symb_id = &get_symb_id($symb);
                   1883:     my $part_id = &get_part_id($part);
                   1884:     my $stats_table = $courseid.'_problem_stats';
                   1885:     #
                   1886:     my $dbh = &Apache::lonmysql::get_dbh();
                   1887:     return undef if (! defined($dbh));
                   1888:     #
1.123     matthew  1889:     # Clean out the table
1.61      matthew  1890:     $dbh->do('DROP TABLE '.$stats_table);  # May return an error
                   1891:     my $request = 
1.115     matthew  1892:         'CREATE TEMPORARY TABLE '.$stats_table.' '.
                   1893:         'SELECT a.student_id,a.solved,a.award,a.awarded,a.tries '.
                   1894:         'FROM '.$performance_table.' AS a ';
1.123     matthew  1895:     #
                   1896:     # See if we need to include some requirements on the students
1.115     matthew  1897:     if ((defined($Sections) && lc($Sections->[0]) ne 'all') || 
                   1898:         (defined($status)   && lc($status)        ne 'any')) {
                   1899:         $request .= 'NATURAL LEFT JOIN '.$student_table.' AS b ';
                   1900:     }
                   1901:     $request .= ' WHERE a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1.123     matthew  1902:     #
                   1903:     # Limit the students included to those specified
1.115     matthew  1904:     if (defined($Sections) && lc($Sections->[0]) ne 'all') {
1.64      matthew  1905:         $request .= ' AND ('.
1.115     matthew  1906:             join(' OR ', map { "b.section='".$_."'" } @$Sections
1.64      matthew  1907:                  ).')';
                   1908:     }
1.115     matthew  1909:     if (defined($status) && lc($status) ne 'any') {
                   1910:         $request .= " AND b.status='".$status."'";
1.122     matthew  1911:     }
                   1912:     #
1.123     matthew  1913:     # Limit by starttime and endtime
1.122     matthew  1914:     my $time_requirements = undef;
                   1915:     if (defined($starttime)) {
                   1916:         $time_requirements .= 'a.timestamp>='.$starttime;
                   1917:         if (defined($endtime)) {
                   1918:             $time_requirements .= ' AND a.timestamp<='.$endtime;
                   1919:         }
                   1920:     } elsif (defined($endtime)) {
                   1921:         $time_requirements .= 'a.timestamp<='.$endtime;
                   1922:     }
                   1923:     if (defined($time_requirements)) {
                   1924:         $request .= ' AND '.$time_requirements;
1.115     matthew  1925:     }
1.123     matthew  1926:     #
                   1927:     # Finally, execute the request to create the temporary table
1.61      matthew  1928:     $dbh->do($request);
1.123     matthew  1929:     #
                   1930:     # Collect the first suite of statistics
1.128     matthew  1931:     $request = 'SELECT COUNT(*),SUM(tries),'.
                   1932:         'AVG(tries),STD(tries) '.
1.109     matthew  1933:         'FROM '.$stats_table;
1.128     matthew  1934:     my ($num,$tries,$mean,$STD) = &execute_SQL_request
1.109     matthew  1935:         ($dbh,$request);
1.128     matthew  1936:     #
                   1937:     $request = 'SELECT MAX(tries),MIN(tries) FROM '.$stats_table.
                   1938:         ' WHERE awarded>0';
                   1939:     if (defined($time_requirements)) {
                   1940:         $request .= ' AND '.$time_requirements;
                   1941:     }
                   1942:     my ($max,$min) = &execute_SQL_request($dbh,$request);
                   1943:     #
1.109     matthew  1944:     $request = 'SELECT SUM(awarded) FROM '.$stats_table;
1.128     matthew  1945:     if (defined($time_requirements)) {
                   1946:         $request .= ' AND '.$time_requirements;
                   1947:     }
1.109     matthew  1948:     my ($Solved) = &execute_SQL_request($dbh,$request);
1.128     matthew  1949:     #
1.109     matthew  1950:     $request = 'SELECT SUM(awarded) FROM '.$stats_table.
                   1951:         " WHERE solved='correct_by_override'";
1.128     matthew  1952:     if (defined($time_requirements)) {
                   1953:         $request .= ' AND '.$time_requirements;
                   1954:     }
1.109     matthew  1955:     my ($solved) = &execute_SQL_request($dbh,$request);
                   1956:     #
1.133     matthew  1957:     $Solved -= $solved;
                   1958:     #
1.61      matthew  1959:     $num    = 0 if (! defined($num));
                   1960:     $tries  = 0 if (! defined($tries));
1.128     matthew  1961:     $max    = 0 if (! defined($max));
                   1962:     $min    = 0 if (! defined($min));
1.61      matthew  1963:     $STD    = 0 if (! defined($STD));
1.133     matthew  1964:     $Solved = 0 if (! defined($Solved) || $Solved < 0);
1.61      matthew  1965:     $solved = 0 if (! defined($solved));
                   1966:     #
1.123     matthew  1967:     # Compute the more complicated statistics
1.61      matthew  1968:     my $DegOfDiff = 'nan';
1.66      matthew  1969:     $DegOfDiff = 1-($Solved)/$tries if ($tries>0);
1.123     matthew  1970:     #
1.61      matthew  1971:     my $SKEW = 'nan';
1.66      matthew  1972:     my $wrongpercent = 0;
1.128     matthew  1973:     my $numwrong = 'nan';
1.61      matthew  1974:     if ($num > 0) {
                   1975:         ($SKEW) = &execute_SQL_request($dbh,'SELECT SQRT(SUM('.
                   1976:                                      'POWER(tries - '.$STD.',3)'.
                   1977:                                      '))/'.$num.' FROM '.$stats_table);
1.128     matthew  1978:         $numwrong = $num-$Solved;
                   1979:         $wrongpercent=int(10*100*$numwrong/$num)/10;
1.61      matthew  1980:     }
                   1981:     #
1.123     matthew  1982:     # Drop the temporary table
                   1983:     $dbh->do('DROP TABLE '.$stats_table);  # May return an error
1.81      matthew  1984:     #
                   1985:     # Return result
1.66      matthew  1986:     return { num_students => $num,
                   1987:              tries        => $tries,
1.128     matthew  1988:              max_tries    => $max,
                   1989:              min_tries    => $min,
1.66      matthew  1990:              mean_tries   => $mean,
                   1991:              std_tries    => $STD,
                   1992:              skew_tries   => $SKEW,
                   1993:              num_solved   => $Solved,
                   1994:              num_override => $solved,
1.128     matthew  1995:              num_wrong    => $numwrong,
1.66      matthew  1996:              per_wrong    => $wrongpercent,
1.81      matthew  1997:              deg_of_diff  => $DegOfDiff };
1.61      matthew  1998: }
                   1999: 
1.127     matthew  2000: ##
                   2001: ## This is a helper for get_statistics
1.61      matthew  2002: sub execute_SQL_request {
                   2003:     my ($dbh,$request)=@_;
                   2004: #    &Apache::lonnet::logthis($request);
                   2005:     my $sth = $dbh->prepare($request);
                   2006:     $sth->execute();
                   2007:     my $row = $sth->fetchrow_arrayref();
                   2008:     if (ref($row) eq 'ARRAY' && scalar(@$row)>0) {
                   2009:         return @$row;
                   2010:     }
                   2011:     return ();
                   2012: }
1.123     matthew  2013: 
1.127     matthew  2014: ######################################################
                   2015: ######################################################
                   2016: 
                   2017: =pod
                   2018: 
                   2019: =item &populate_weight_table
                   2020: 
                   2021: =cut
                   2022: 
                   2023: ######################################################
                   2024: ######################################################
                   2025: sub populate_weight_table {
                   2026:     my ($courseid) = @_;
                   2027:     if (! defined($courseid)) {
                   2028:         $courseid = $ENV{'request.course.id'};
                   2029:     }
                   2030:     #
                   2031:     &setup_table_names($courseid);
                   2032:     my ($top,$sequences,$assessments) = get_sequence_assessment_data();
                   2033:     if (! defined($top) || ! ref($top)) {
                   2034:         # There has been an error, better report it
                   2035:         &Apache::lonnet::logthis('top is undefined');
                   2036:         return;
                   2037:     }
                   2038:     #       Since we use lonnet::EXT to retrieve problem weights,
                   2039:     #       to ensure current data we must clear the caches out.
                   2040:     &Apache::lonnet::clear_EXT_cache_status();
                   2041:     my $dbh = &Apache::lonmysql::get_dbh();
                   2042:     my $request = 'INSERT IGNORE INTO '.$weight_table.
                   2043:         "(symb_id,part_id,weight) VALUES ";
                   2044:     my $weight;
                   2045:     foreach my $res (@$assessments) {
                   2046:         my $symb_id = &get_symb_id($res->{'symb'});
                   2047:         foreach my $part (@{$res->{'parts'}}) {
                   2048:             my $part_id = &get_part_id($part);
                   2049:             $weight = &Apache::lonnet::EXT('resource.'.$part.'.weight',
                   2050:                                            $res->{'symb'},
                   2051:                                            undef,undef,undef);
                   2052:             if (!defined($weight) || ($weight eq '')) { 
                   2053:                 $weight=1;
                   2054:             }
                   2055:             $request .= "('".$symb_id."','".$part_id."','".$weight."'),";
                   2056:         }
                   2057:     }
                   2058:     $request =~ s/(,)$//;
                   2059: #    &Apache::lonnet::logthis('request = '.$/.$request);
                   2060:     $dbh->do($request);
                   2061:     if ($dbh->err()) {
                   2062:         &Apache::lonnet::logthis("error ".$dbh->errstr().
                   2063:                                  " occured executing \n".
                   2064:                                  $request);
                   2065:     }
                   2066:     return;
                   2067: }
                   2068: 
                   2069: ##########################################################
                   2070: ##########################################################
1.61      matthew  2071: 
1.127     matthew  2072: =pod
                   2073: 
1.129     matthew  2074: =item &limit_by_start_end_times
                   2075: 
                   2076: Build SQL WHERE condition which limits the data collected by the start
                   2077: and end times provided
                   2078: 
                   2079: Inputs: $starttime, $endtime, $table
                   2080: 
                   2081: Returns: $time_limits
                   2082: 
                   2083: =cut
                   2084: 
                   2085: ##########################################################
                   2086: ##########################################################
                   2087: sub limit_by_start_end_time {
                   2088:     my ($starttime,$endtime,$table) = @_;
                   2089:     my $time_requirements = undef;
                   2090:     if (defined($starttime)) {
                   2091:         $time_requirements .= $table.".timestamp>='".$starttime."'";
                   2092:         if (defined($endtime)) {
                   2093:             $time_requirements .= " AND ".$table.".timestamp<='".$endtime."'";
                   2094:         }
                   2095:     } elsif (defined($endtime)) {
                   2096:         $time_requirements .= $table.".timestamp<='".$endtime."'";
                   2097:     }
                   2098:     return $time_requirements;
                   2099: }
                   2100: 
                   2101: ##########################################################
                   2102: ##########################################################
                   2103: 
                   2104: =pod
                   2105: 
1.127     matthew  2106: =item &limit_by_section_and_status
                   2107: 
                   2108: Build SQL WHERE condition which limits the data collected by section and
                   2109: student status.
                   2110: 
                   2111: Inputs: $Sections (array ref)
                   2112:     $enrollment (string: 'any', 'expired', 'active')
                   2113:     $tablename The name of the table that holds the student data
                   2114: 
                   2115: Returns: $student_requirements,$enrollment_requirements
                   2116: 
                   2117: =cut
                   2118: 
                   2119: ##########################################################
                   2120: ##########################################################
                   2121: sub limit_by_section_and_status {
                   2122:     my ($Sections,$enrollment,$tablename) = @_;
                   2123:     my $student_requirements = undef;
                   2124:     if ( (defined($Sections) && $Sections->[0] ne 'all')) {
                   2125:         $student_requirements = '('.
                   2126:             join(' OR ', map { $tablename.".section='".$_."'" } @$Sections
                   2127:                  ).')';
                   2128:     }
                   2129:     #
                   2130:     my $enrollment_requirements=undef;
                   2131:     if (defined($enrollment) && $enrollment ne 'Any') {
                   2132:         $enrollment_requirements = $tablename.".status='".$enrollment."'";
                   2133:     }
                   2134:     return ($student_requirements,$enrollment_requirements);
                   2135: }
                   2136: 
                   2137: ######################################################
                   2138: ######################################################
                   2139: 
                   2140: =pod
                   2141: 
                   2142: =item rank_students_by_scores_on_resources
                   2143: 
                   2144: Inputs: 
                   2145:     $resources: array ref of hash ref.  Each hash ref needs key 'symb'.
                   2146:     $Sections: array ref of sections to include,
                   2147:     $enrollment: string,
                   2148:     $courseid (may be omitted)
                   2149: 
                   2150: Returns; An array of arrays.  The sub arrays contain a student name and
                   2151: their score on the resources.
                   2152: 
                   2153: =cut
                   2154: 
                   2155: ######################################################
                   2156: ######################################################
                   2157: sub RNK_student { return 0; };
                   2158: sub RNK_score   { return 1; };
                   2159: 
                   2160: sub rank_students_by_scores_on_resources {
1.130     matthew  2161:     my ($resources,$Sections,$enrollment,$courseid,$starttime,$endtime) = @_;
1.127     matthew  2162:     return if (! defined($resources) || ! ref($resources) eq 'ARRAY');
                   2163:     if (! defined($courseid)) {
                   2164:         $courseid = $ENV{'request.course.id'};
                   2165:     }
                   2166:     #
                   2167:     &setup_table_names($courseid);
                   2168:     my $dbh = &Apache::lonmysql::get_dbh();
                   2169:     my ($section_limits,$enrollment_limits)=
                   2170:         &limit_by_section_and_status($Sections,$enrollment,'b');
                   2171:     my $symb_limits = '('.join(' OR ',map {'a.symb_id='.&get_symb_id($_);
                   2172:                                        } @$resources
                   2173:                                ).')';
1.130     matthew  2174:     my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1.127     matthew  2175:     my $request = 'SELECT b.student,SUM(a.awarded*w.weight) AS score FROM '.
                   2176:         $performance_table.' AS a '.
                   2177:         'NATURAL LEFT JOIN '.$weight_table.' AS w '.
                   2178:         'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
                   2179:         'WHERE ';
                   2180:     if (defined($section_limits)) {
                   2181:         $request .= $section_limits.' AND ';
                   2182:     }
                   2183:     if (defined($enrollment_limits)) {
                   2184:         $request .= $enrollment_limits.' AND ';
                   2185:     }
1.130     matthew  2186:     if (defined($time_limits)) {
                   2187:         $request .= $time_limits.' AND ';
                   2188:     }
1.127     matthew  2189:     if ($symb_limits ne '()') {
                   2190:         $request .= $symb_limits.' AND ';
                   2191:     }
                   2192:     $request =~ s/( AND )$//;   # Remove extra conjunction
                   2193:     $request =~ s/( WHERE )$//; # In case there were no limits placed on it
                   2194:     $request .= ' GROUP BY a.student_id ORDER BY score';
                   2195:     #&Apache::lonnet::logthis('request = '.$/.$request);
                   2196:     my $sth = $dbh->prepare($request);
                   2197:     $sth->execute();
                   2198:     my $rows = $sth->fetchall_arrayref();
                   2199:     return ($rows);
                   2200: }
                   2201: 
                   2202: ########################################################
                   2203: ########################################################
                   2204: 
                   2205: =pod
                   2206: 
                   2207: =item &get_sum_of_scores
                   2208: 
                   2209: Inputs: $resource (hash ref, needs {'symb'} key),
                   2210: $part, (the part id),
                   2211: $students (array ref, contents of array are scalars holding 'sname:sdom'),
                   2212: $courseid
                   2213: 
                   2214: Returns: the sum of the score on the problem part over the students and the
                   2215:    maximum possible value for the sum (taken from the weight table).
                   2216: 
                   2217: =cut
                   2218: 
                   2219: ########################################################
                   2220: ########################################################
                   2221: sub get_sum_of_scores {
1.130     matthew  2222:     my ($resource,$part,$students,$courseid,$starttime,$endtime) = @_;
1.127     matthew  2223:     if (! defined($courseid)) {
                   2224:         $courseid = $ENV{'request.course.id'};
                   2225:     }
1.138     matthew  2226:     if (defined($students) && 
                   2227:         ((@$students == 0) ||
                   2228:          (@$students == 1 && (! defined($students->[0]) || 
                   2229:                               $students->[0] eq ''))
                   2230:          )
                   2231:         ){
                   2232:         undef($students);
                   2233:     }
1.127     matthew  2234:     #
                   2235:     &setup_table_names($courseid);
                   2236:     my $dbh = &Apache::lonmysql::get_dbh();
1.130     matthew  2237:     my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
1.127     matthew  2238:     my $request = 'SELECT SUM(a.awarded*w.weight),SUM(w.weight) FROM '.
                   2239:         $performance_table.' AS a '.
                   2240:         'NATURAL LEFT JOIN '.$weight_table.' AS w ';
                   2241:     $request .= 'WHERE a.symb_id='.&get_symb_id($resource->{'symb'}).
                   2242:         ' AND a.part_id='.&get_part_id($part);
1.130     matthew  2243:     if (defined($time_limits)) {
                   2244:         $request .= ' AND '.$time_limits;
                   2245:     }
1.127     matthew  2246:     if (defined($students)) {
                   2247:         $request .= ' AND ('.
                   2248:             join(' OR ',map {'a.student_id='.&get_student_id(split(':',$_));
                   2249:                          } @$students).
                   2250:                              ')';
                   2251:     }
                   2252:     my $sth = $dbh->prepare($request);
                   2253:     $sth->execute();
                   2254:     my $rows = $sth->fetchrow_arrayref();
                   2255:     if ($dbh->err) {
1.138     matthew  2256:         &Apache::lonnet::logthis('error 1 = '.$dbh->errstr());
                   2257:         &Apache::lonnet::logthis('prepared then executed, fetchrow_arrayrefed'.
                   2258:                                  $/.$request);
1.127     matthew  2259:         return (undef,undef);
                   2260:     }
                   2261:     return ($rows->[0],$rows->[1]);
                   2262: }
                   2263: 
1.129     matthew  2264: ########################################################
                   2265: ########################################################
                   2266: 
                   2267: =pod
                   2268: 
                   2269: =item &score_stats
                   2270: 
                   2271: Inputs: $Sections, $enrollment, $symbs, $starttime,
                   2272:         $endtime, $courseid
                   2273: 
                   2274: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as 
                   2275: elsewhere in this module.  
                   2276: $symbs is an array ref of symbs
                   2277: 
                   2278: Returns: minimum, maximum, mean, s.d., number of students, and maximum
                   2279:   possible of student scores on the given resources
                   2280: 
                   2281: =cut
                   2282: 
                   2283: ########################################################
                   2284: ########################################################
                   2285: sub score_stats {
                   2286:     my ($Sections,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
                   2287:     if (! defined($courseid)) {
                   2288:         $courseid = $ENV{'request.course.id'};
                   2289:     }
                   2290:     #
                   2291:     &setup_table_names($courseid);
                   2292:     my $dbh = &Apache::lonmysql::get_dbh();
                   2293:     #
                   2294:     my ($section_limits,$enrollment_limits)=
                   2295:         &limit_by_section_and_status($Sections,$enrollment,'b');
                   2296:     my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
                   2297:     my @Symbids = map { &get_symb_id($_); } @{$symbs};
                   2298:     #
                   2299:     my $stats_table = $courseid.'_problem_stats';
                   2300:     my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
                   2301:     my $request = 'DROP TABLE '.$stats_table;
                   2302:     $dbh->do($request);
                   2303:     $request = 
                   2304:         'CREATE TEMPORARY TABLE '.$stats_table.' '.
                   2305:         'SELECT a.student_id,'.
                   2306:         'SUM(a.awarded*w.weight) AS score FROM '.
                   2307:         $performance_table.' AS a '.
                   2308:         'NATURAL LEFT JOIN '.$weight_table.' AS w '.
                   2309:         'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
                   2310:         'WHERE ('.$symb_restriction.')';
                   2311:     if ($time_limits) {
                   2312:         $request .= ' AND '.$time_limits;
                   2313:     }
                   2314:     if ($section_limits) {
                   2315:         $request .= ' AND '.$section_limits;
                   2316:     }
                   2317:     if ($enrollment_limits) {
                   2318:         $request .= ' AND '.$enrollment_limits;
                   2319:     }
                   2320:     $request .= ' GROUP BY a.student_id';
                   2321: #    &Apache::lonnet::logthis('request = '.$/.$request);
                   2322:     my $sth = $dbh->prepare($request);
                   2323:     $sth->execute();
                   2324:     $request = 
                   2325:         'SELECT AVG(score),STD(score),MAX(score),MIN(score),COUNT(score) '.
                   2326:         'FROM '.$stats_table;
                   2327:     my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
                   2328: #    &Apache::lonnet::logthis('request = '.$/.$request);
                   2329:     
                   2330:     $request = 'SELECT SUM(weight) FROM '.$weight_table.
                   2331:         ' WHERE ('.$symb_restriction.')';
                   2332:     my ($max_possible) = &execute_SQL_request($dbh,$request);
                   2333:     # &Apache::lonnet::logthis('request = '.$/.$request);
                   2334:     return($min,$max,$ave,$std,$count,$max_possible);
                   2335: }
                   2336: 
                   2337: 
                   2338: ########################################################
                   2339: ########################################################
                   2340: 
                   2341: =pod
                   2342: 
                   2343: =item &count_stats
                   2344: 
                   2345: Inputs: $Sections, $enrollment, $symbs, $starttime,
                   2346:         $endtime, $courseid
                   2347: 
                   2348: $Sections, $enrollment, $starttime, $endtime, and $courseid are the same as 
                   2349: elsewhere in this module.  
                   2350: $symbs is an array ref of symbs
                   2351: 
                   2352: Returns: minimum, maximum, mean, s.d., and number of students
                   2353:   of the number of items correct on the given resources
                   2354: 
                   2355: =cut
                   2356: 
                   2357: ########################################################
                   2358: ########################################################
                   2359: sub count_stats {
                   2360:     my ($Sections,$enrollment,$symbs,$starttime,$endtime,$courseid)=@_;
                   2361:     if (! defined($courseid)) {
                   2362:         $courseid = $ENV{'request.course.id'};
                   2363:     }
                   2364:     #
                   2365:     &setup_table_names($courseid);
                   2366:     my $dbh = &Apache::lonmysql::get_dbh();
                   2367:     #
                   2368:     my ($section_limits,$enrollment_limits)=
                   2369:         &limit_by_section_and_status($Sections,$enrollment,'b');
                   2370:     my $time_limits = &limit_by_start_end_time($starttime,$endtime,'a');
                   2371:     my @Symbids = map { &get_symb_id($_); } @{$symbs};
                   2372:     #
                   2373:     my $stats_table = $courseid.'_problem_stats';
                   2374:     my $symb_restriction = join(' OR ',map {'a.symb_id='.$_;} @Symbids);
                   2375:     my $request = 'DROP TABLE '.$stats_table;
                   2376:     $dbh->do($request);
                   2377:     $request = 
                   2378:         'CREATE TEMPORARY TABLE '.$stats_table.' '.
                   2379:         'SELECT a.student_id,'.
                   2380:         'COUNT(a.award) AS count FROM '.
                   2381:         $performance_table.' AS a '.
                   2382:         'LEFT JOIN '.$student_table.' AS b ON a.student_id=b.student_id '.
                   2383:         'WHERE ('.$symb_restriction.')'.
                   2384:         " AND a.award!='INCORRECT_ATTEMPTED'";
                   2385:     if ($time_limits) {
                   2386:         $request .= ' AND '.$time_limits;
                   2387:     }
                   2388:     if ($section_limits) {
                   2389:         $request .= ' AND '.$section_limits;
                   2390:     }
                   2391:     if ($enrollment_limits) {
                   2392:         $request .= ' AND '.$enrollment_limits;
                   2393:     }
                   2394:     $request .= ' GROUP BY a.student_id';
1.131     matthew  2395: #    &Apache::lonnet::logthis('request = '.$/.$request);
1.129     matthew  2396:     my $sth = $dbh->prepare($request);
                   2397:     $sth->execute();
                   2398:     $request = 
                   2399:         'SELECT AVG(count),STD(count),MAX(count),MIN(count),COUNT(count) '.
                   2400:         'FROM '.$stats_table;
                   2401:     my ($ave,$std,$max,$min,$count) = &execute_SQL_request($dbh,$request);
1.131     matthew  2402: #    &Apache::lonnet::logthis('request = '.$/.$request);
1.129     matthew  2403:     return($min,$max,$ave,$std,$count);
                   2404: }
1.127     matthew  2405: 
                   2406: ######################################################
                   2407: ######################################################
                   2408: 
                   2409: =pod
                   2410: 
                   2411: =item get_student_data
                   2412: 
                   2413: =cut
                   2414: 
                   2415: ######################################################
                   2416: ######################################################
1.105     matthew  2417: sub get_student_data {
                   2418:     my ($students,$courseid) = @_;
                   2419:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   2420:     &setup_table_names($courseid);
                   2421:     my $dbh = &Apache::lonmysql::get_dbh();
                   2422:     return undef if (! defined($dbh));
                   2423:     my $request = 'SELECT '.
                   2424:         'student_id, student '.
                   2425:         'FROM '.$student_table;
                   2426:     if (defined($students)) {
                   2427:         $request .= ' WHERE ('.
                   2428:             join(' OR ', map {'student_id='.
                   2429:                                   &get_student_id($_->{'username'},
                   2430:                                                   $_->{'domain'})
                   2431:                               } @$students
                   2432:                  ).')';
                   2433:     }
                   2434:     $request.= ' ORDER BY student_id';
                   2435:     my $sth = $dbh->prepare($request);
                   2436:     $sth->execute();
                   2437:     if ($dbh->err) {
1.138     matthew  2438:         &Apache::lonnet::logthis('error 2 = '.$dbh->errstr());
                   2439:         &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1.105     matthew  2440:         return undef;
                   2441:     }
                   2442:     my $dataset = $sth->fetchall_arrayref();
                   2443:     if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
                   2444:         return $dataset;
                   2445:     }
                   2446: }
                   2447: 
1.108     matthew  2448: sub RD_student_id    { return 0; }
                   2449: sub RD_awarddetail   { return 1; }
                   2450: sub RD_response_eval { return 2; }
                   2451: sub RD_submission    { return 3; }
                   2452: sub RD_timestamp     { return 4; }
                   2453: sub RD_tries         { return 5; }
                   2454: sub RD_sname         { return 6; }
                   2455: 
                   2456: sub get_response_data {
1.126     matthew  2457:     my ($Sections,$enrollment,$symb,$response,$courseid) = @_;
1.103     matthew  2458:     return undef if (! defined($symb) || 
1.100     matthew  2459:                ! defined($response));
                   2460:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   2461:     #
                   2462:     &setup_table_names($courseid);
                   2463:     my $symb_id = &get_symb_id($symb);
1.137     matthew  2464:     if (! defined($symb_id)) {
                   2465:         &Apache::lonnet::logthis('Unable to find symb for '.$symb.' in '.$courseid);
                   2466:         return undef;
                   2467:     }
1.100     matthew  2468:     my $response_id = &get_part_id($response);
1.137     matthew  2469:     if (! defined($response_id)) {
                   2470:         &Apache::lonnet::logthis('Unable to find id for '.$response.' in '.$courseid);
                   2471:         return undef;
                   2472:     }
1.100     matthew  2473:     #
                   2474:     my $dbh = &Apache::lonmysql::get_dbh();
                   2475:     return undef if (! defined($dbh));
1.126     matthew  2476:     #
1.127     matthew  2477:     my ($student_requirements,$enrollment_requirements) = 
                   2478:         &limit_by_section_and_status($Sections,$enrollment,'d');
1.100     matthew  2479:     my $request = 'SELECT '.
1.105     matthew  2480:         'a.student_id, a.awarddetail, a.response_specific_value, '.
1.108     matthew  2481:         'a.submission, b.timestamp, c.tries, d.student '.
1.100     matthew  2482:         'FROM '.$fulldump_response_table.' AS a '.
                   2483:         'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
                   2484:         'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
                   2485:         'a.transaction = b.transaction '.
                   2486:         'LEFT JOIN '.$fulldump_part_table.' AS c '.
                   2487:         'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.        
                   2488:         'a.part_id=c.part_id AND a.transaction = c.transaction '.
1.108     matthew  2489:         'LEFT JOIN '.$student_table.' AS d '.
                   2490:         'ON a.student_id=d.student_id '.
1.100     matthew  2491:         'WHERE '.
                   2492:         'a.symb_id='.$symb_id.' AND a.response_id='.$response_id;
1.126     matthew  2493:     if (defined($student_requirements) || defined($enrollment_requirements)) {
                   2494:         $request .= ' AND ';
                   2495:         if (defined($student_requirements)) {
                   2496:             $request .= $student_requirements.' AND ';
                   2497:         }
                   2498:         if (defined($enrollment_requirements)) {
                   2499:             $request .= $enrollment_requirements.' AND ';
                   2500:         }
                   2501:         $request =~ s/( AND )$//;
1.100     matthew  2502:     }
                   2503:     $request .= ' ORDER BY b.timestamp';
1.103     matthew  2504: #    &Apache::lonnet::logthis("request =\n".$request);
1.100     matthew  2505:     my $sth = $dbh->prepare($request);
                   2506:     $sth->execute();
1.105     matthew  2507:     if ($dbh->err) {
1.138     matthew  2508:         &Apache::lonnet::logthis('error 3 = '.$dbh->errstr());
                   2509:         &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1.105     matthew  2510:         return undef;
                   2511:     }
1.100     matthew  2512:     my $dataset = $sth->fetchall_arrayref();
                   2513:     if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
1.117     matthew  2514:         # Clear the \'s from around the submission
                   2515:         for (my $i =0;$i<scalar(@$dataset);$i++) {
                   2516:             $dataset->[$i]->[3] =~ s/(\'$|^\')//g;
                   2517:         }
1.103     matthew  2518:         return $dataset;
1.100     matthew  2519:     }
1.118     matthew  2520: }
                   2521: 
                   2522: 
                   2523: sub RDs_awarddetail   { return 3; }
                   2524: sub RDs_submission    { return 2; }
                   2525: sub RDs_timestamp     { return 1; }
                   2526: sub RDs_tries         { return 0; }
1.119     matthew  2527: sub RDs_awarded       { return 4; }
1.118     matthew  2528: 
                   2529: sub get_response_data_by_student {
                   2530:     my ($student,$symb,$response,$courseid) = @_;
                   2531:     return undef if (! defined($symb) || 
                   2532:                      ! defined($response));
                   2533:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   2534:     #
                   2535:     &setup_table_names($courseid);
                   2536:     my $symb_id = &get_symb_id($symb);
                   2537:     my $response_id = &get_part_id($response);
                   2538:     #
                   2539:     my $student_id = &get_student_id($student->{'username'},
                   2540:                                      $student->{'domain'});
                   2541:     #
                   2542:     my $dbh = &Apache::lonmysql::get_dbh();
                   2543:     return undef if (! defined($dbh));
                   2544:     my $request = 'SELECT '.
1.119     matthew  2545:         'c.tries, b.timestamp, a.submission, a.awarddetail, e.awarded '.
1.118     matthew  2546:         'FROM '.$fulldump_response_table.' AS a '.
                   2547:         'LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
                   2548:         'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
                   2549:         'a.transaction = b.transaction '.
                   2550:         'LEFT JOIN '.$fulldump_part_table.' AS c '.
                   2551:         'ON a.symb_id=c.symb_id AND a.student_id=c.student_id AND '.        
                   2552:         'a.part_id=c.part_id AND a.transaction = c.transaction '.
                   2553:         'LEFT JOIN '.$student_table.' AS d '.
                   2554:         'ON a.student_id=d.student_id '.
1.119     matthew  2555:         'LEFT JOIN '.$performance_table.' AS e '.
                   2556:         'ON a.symb_id=e.symb_id AND a.part_id=e.part_id AND '.
                   2557:         'a.student_id=e.student_id AND c.tries=e.tries '.
1.118     matthew  2558:         'WHERE '.
                   2559:         'a.symb_id='.$symb_id.' AND a.response_id='.$response_id.
                   2560:         ' AND a.student_id='.$student_id.' ORDER BY b.timestamp';
1.125     matthew  2561: #    &Apache::lonnet::logthis("request =\n".$request);
1.118     matthew  2562:     my $sth = $dbh->prepare($request);
                   2563:     $sth->execute();
                   2564:     if ($dbh->err) {
1.138     matthew  2565:         &Apache::lonnet::logthis('error 4 = '.$dbh->errstr());
                   2566:         &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1.118     matthew  2567:         return undef;
                   2568:     }
                   2569:     my $dataset = $sth->fetchall_arrayref();
                   2570:     if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
                   2571:         # Clear the \'s from around the submission
                   2572:         for (my $i =0;$i<scalar(@$dataset);$i++) {
                   2573:             $dataset->[$i]->[2] =~ s/(\'$|^\')//g;
                   2574:         }
                   2575:         return $dataset;
                   2576:     }
                   2577:     return undef; # error occurred
1.106     matthew  2578: }
1.108     matthew  2579: 
                   2580: sub RT_student_id { return 0; }
                   2581: sub RT_awarded    { return 1; }
                   2582: sub RT_tries      { return 2; }
                   2583: sub RT_timestamp  { return 3; }
1.106     matthew  2584: 
                   2585: sub get_response_time_data {
1.107     matthew  2586:     my ($students,$symb,$part,$courseid) = @_;
1.106     matthew  2587:     return undef if (! defined($symb) || 
1.107     matthew  2588:                      ! defined($part));
1.106     matthew  2589:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   2590:     #
                   2591:     &setup_table_names($courseid);
                   2592:     my $symb_id = &get_symb_id($symb);
1.107     matthew  2593:     my $part_id = &get_part_id($part);
1.106     matthew  2594:     #
                   2595:     my $dbh = &Apache::lonmysql::get_dbh();
                   2596:     return undef if (! defined($dbh));
                   2597:     my $request = 'SELECT '.
1.107     matthew  2598:         'a.student_id, a.awarded, a.tries, b.timestamp '.
                   2599:         'FROM '.$fulldump_part_table.' AS a '.
1.106     matthew  2600:         'NATURAL LEFT JOIN '.$fulldump_timestamp_table.' AS b '.
                   2601: #        'ON a.symb_id=b.symb_id AND a.student_id=b.student_id AND '.
                   2602: #        'a.transaction = b.transaction '.
                   2603:         'WHERE '.
1.107     matthew  2604:         'a.symb_id='.$symb_id.' AND a.part_id='.$part_id;
1.106     matthew  2605:     if (defined($students)) {
                   2606:         $request .= ' AND ('.
                   2607:             join(' OR ', map {'a.student_id='.
                   2608:                                   &get_student_id($_->{'username'},
                   2609:                                                   $_->{'domain'})
                   2610:                               } @$students
                   2611:                  ).')';
                   2612:     }
                   2613:     $request .= ' ORDER BY b.timestamp';
                   2614: #    &Apache::lonnet::logthis("request =\n".$request);
                   2615:     my $sth = $dbh->prepare($request);
                   2616:     $sth->execute();
                   2617:     if ($dbh->err) {
1.138     matthew  2618:         &Apache::lonnet::logthis('error 5 = '.$dbh->errstr());
                   2619:         &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1.106     matthew  2620:         return undef;
                   2621:     }
                   2622:     my $dataset = $sth->fetchall_arrayref();
                   2623:     if (ref($dataset) eq 'ARRAY' && scalar(@$dataset)>0) {
                   2624:         return $dataset;
                   2625:     }
                   2626: 
1.100     matthew  2627: }
1.61      matthew  2628: 
                   2629: ################################################
                   2630: ################################################
                   2631: 
                   2632: =pod
                   2633: 
1.116     matthew  2634: =item &get_student_scores($Sections,$Symbs,$enrollment,$courseid)
1.113     matthew  2635: 
                   2636: =cut
                   2637: 
                   2638: ################################################
                   2639: ################################################
                   2640: sub get_student_scores {
1.121     matthew  2641:     my ($Sections,$Symbs,$enrollment,$courseid,$starttime,$endtime) = @_;
1.113     matthew  2642:     $courseid = $ENV{'request.course.id'} if (! defined($courseid));
                   2643:     &setup_table_names($courseid);
                   2644:     my $dbh = &Apache::lonmysql::get_dbh();
                   2645:     return (undef) if (! defined($dbh));
                   2646:     my $tmptable = $courseid.'_temp_'.time;
1.114     matthew  2647:     #
                   2648:     my $symb_requirements;
1.113     matthew  2649:     if (defined($Symbs)  && @$Symbs) {
                   2650:         $symb_requirements = '('.
1.114     matthew  2651:             join(' OR ', map{ "(a.symb_id='".&get_symb_id($_->{'symb'}).
1.121     matthew  2652:                               "' AND a.part_id='".&get_part_id($_->{'part'}).
                   2653:                               "')"
1.113     matthew  2654:                               } @$Symbs).')';
                   2655:     }
1.114     matthew  2656:     #
                   2657:     my $student_requirements;
                   2658:     if ( (defined($Sections) && $Sections->[0] ne 'all')) {
1.113     matthew  2659:         $student_requirements = '('.
1.114     matthew  2660:             join(' OR ', map { "b.section='".$_."'" } @$Sections
1.113     matthew  2661:                  ).')';
                   2662:     }
1.114     matthew  2663:     #
                   2664:     my $enrollment_requirements=undef;
                   2665:     if (defined($enrollment) && $enrollment ne 'Any') {
                   2666:         $enrollment_requirements = "b.status='".$enrollment."'";
                   2667:     }
1.121     matthew  2668:     #
                   2669:     my $time_requirements = undef;
                   2670:     if (defined($starttime)) {
                   2671:         $time_requirements .= "a.timestamp>='".$starttime."'";
                   2672:         if (defined($endtime)) {
                   2673:             $time_requirements .= " AND a.timestamp<='".$endtime."'";
                   2674:         }
                   2675:     } elsif (defined($endtime)) {
                   2676:         $time_requirements .= "a.timestamp<='".$endtime."'";
                   2677:     }
1.114     matthew  2678:     ##
                   2679:     ##
1.113     matthew  2680:     my $request = 'CREATE TEMPORARY TABLE IF NOT EXISTS '.$tmptable.
1.114     matthew  2681:         ' SELECT a.student_id,SUM(a.awarded) AS score FROM '.
                   2682:         $performance_table.' AS a ';
                   2683:     if (defined($student_requirements) || defined($enrollment_requirements)) {
                   2684:         $request .= ' NATURAL LEFT JOIN '.$student_table.' AS b ';
                   2685:     }
                   2686:     if (defined($symb_requirements)      || 
                   2687:         defined($student_requirements)   ||
                   2688:         defined($enrollment_requirements) ) {
1.113     matthew  2689:         $request .= ' WHERE ';
                   2690:     }
1.114     matthew  2691:     if (defined($symb_requirements)) {
                   2692:         $request .= $symb_requirements.' AND ';
                   2693:     }
                   2694:     if (defined($student_requirements)) {
                   2695:         $request .= $student_requirements.' AND ';
                   2696:     }
                   2697:     if (defined($enrollment_requirements)) {
                   2698:         $request .= $enrollment_requirements.' AND ';
                   2699:     }
1.121     matthew  2700:     if (defined($time_requirements)) {
                   2701:         $request .= $time_requirements.' AND ';
                   2702:     }
                   2703:     $request =~ s/ AND $//; # Strip of the trailing ' AND '.
1.114     matthew  2704:     $request .= ' GROUP BY a.student_id';
                   2705: #    &Apache::lonnet::logthis("request = \n".$request);
1.113     matthew  2706:     my $sth = $dbh->prepare($request);
                   2707:     $sth->execute();
                   2708:     if ($dbh->err) {
1.138     matthew  2709:         &Apache::lonnet::logthis('error 6 = '.$dbh->errstr());
                   2710:         &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1.113     matthew  2711:         return undef;
                   2712:     }
                   2713:     $request = 'SELECT score,COUNT(*) FROM '.$tmptable.' GROUP BY score';
                   2714: #    &Apache::lonnet::logthis("request = \n".$request);
                   2715:     $sth = $dbh->prepare($request);
                   2716:     $sth->execute();
                   2717:     if ($dbh->err) {
1.138     matthew  2718:         &Apache::lonnet::logthis('error 7 = '.$dbh->errstr());
                   2719:         &Apache::lonnet::logthis('prepared then executed '.$/.$request);
1.113     matthew  2720:         return undef;
                   2721:     }
                   2722:     my $dataset = $sth->fetchall_arrayref();
                   2723:     return $dataset;
                   2724: }
                   2725: 
                   2726: ################################################
                   2727: ################################################
                   2728: 
                   2729: =pod
                   2730: 
1.61      matthew  2731: =item &setup_table_names()
                   2732: 
                   2733: input: course id
                   2734: 
                   2735: output: none
                   2736: 
                   2737: Cleans up the package variables for local caching.
                   2738: 
                   2739: =cut
                   2740: 
                   2741: ################################################
                   2742: ################################################
                   2743: sub setup_table_names {
                   2744:     my ($courseid) = @_;
                   2745:     if (! defined($courseid)) {
                   2746:         $courseid = $ENV{'request.course.id'};
                   2747:     }
                   2748:     #
                   2749:     if (! defined($current_course) || $current_course ne $courseid) {
                   2750:         # Clear out variables
                   2751:         $have_read_part_table = 0;
                   2752:         undef(%ids_by_part);
                   2753:         undef(%parts_by_id);
                   2754:         $have_read_symb_table = 0;
                   2755:         undef(%ids_by_symb);
                   2756:         undef(%symbs_by_id);
                   2757:         $have_read_student_table = 0;
                   2758:         undef(%ids_by_student);
                   2759:         undef(%students_by_id);
                   2760:         #
                   2761:         $current_course = $courseid;
                   2762:     }
                   2763:     #
                   2764:     # Set up database names
                   2765:     my $base_id = $courseid;
                   2766:     $symb_table        = $base_id.'_'.'symb';
                   2767:     $part_table        = $base_id.'_'.'part';
                   2768:     $student_table     = $base_id.'_'.'student';
                   2769:     $performance_table = $base_id.'_'.'performance';
                   2770:     $parameters_table  = $base_id.'_'.'parameters';
1.89      matthew  2771:     $fulldump_part_table      = $base_id.'_'.'partdata';
                   2772:     $fulldump_response_table  = $base_id.'_'.'responsedata';
                   2773:     $fulldump_timestamp_table = $base_id.'_'.'timestampdata';
1.127     matthew  2774:     $weight_table             = $base_id.'_'.'weight';
1.89      matthew  2775:     #
                   2776:     @Tables = (
                   2777:                $symb_table,
                   2778:                $part_table,
                   2779:                $student_table,
                   2780:                $performance_table,
                   2781:                $parameters_table,
                   2782:                $fulldump_part_table,
                   2783:                $fulldump_response_table,
                   2784:                $fulldump_timestamp_table,
1.127     matthew  2785:                $weight_table,
1.89      matthew  2786:                );
1.61      matthew  2787:     return;
1.3       stredwic 2788: }
1.1       stredwic 2789: 
1.35      matthew  2790: ################################################
                   2791: ################################################
                   2792: 
                   2793: =pod
                   2794: 
1.57      matthew  2795: =back
                   2796: 
                   2797: =item End of Local Data Caching Subroutines
                   2798: 
                   2799: =cut
                   2800: 
                   2801: ################################################
                   2802: ################################################
                   2803: 
1.89      matthew  2804: } # End scope of table identifiers
1.57      matthew  2805: 
                   2806: ################################################
                   2807: ################################################
                   2808: 
                   2809: =pod
                   2810: 
                   2811: =head3 Classlist Subroutines
                   2812: 
1.35      matthew  2813: =item &get_classlist();
                   2814: 
                   2815: Retrieve the classist of a given class or of the current class.  Student
                   2816: information is returned from the classlist.db file and, if needed,
                   2817: from the students environment.
                   2818: 
                   2819: Optional arguments are $cid, $cdom, and $cnum (course id, course domain,
                   2820: and course number, respectively).  Any omitted arguments will be taken 
                   2821: from the current environment ($ENV{'request.course.id'},
                   2822: $ENV{'course.'.$cid.'.domain'}, and $ENV{'course.'.$cid.'.num'}).
                   2823: 
                   2824: Returns a reference to a hash which contains:
                   2825:  keys    '$sname:$sdom'
1.136     raeburn  2826:  values  [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype]
1.54      bowersj2 2827: 
                   2828: The constant values CL_SDOM, CL_SNAME, CL_END, etc. can be used
                   2829: as indices into the returned list to future-proof clients against
                   2830: changes in the list order.
1.35      matthew  2831: 
                   2832: =cut
                   2833: 
                   2834: ################################################
                   2835: ################################################
1.54      bowersj2 2836: 
                   2837: sub CL_SDOM     { return 0; }
                   2838: sub CL_SNAME    { return 1; }
                   2839: sub CL_END      { return 2; }
                   2840: sub CL_START    { return 3; }
                   2841: sub CL_ID       { return 4; }
                   2842: sub CL_SECTION  { return 5; }
                   2843: sub CL_FULLNAME { return 6; }
                   2844: sub CL_STATUS   { return 7; }
1.111     raeburn  2845: sub CL_TYPE     { return 8; }
1.136     raeburn  2846: sub CL_LOCKEDTYPE   { return 9; }
1.35      matthew  2847: 
                   2848: sub get_classlist {
                   2849:     my ($cid,$cdom,$cnum) = @_;
                   2850:     $cid = $cid || $ENV{'request.course.id'};
                   2851:     $cdom = $cdom || $ENV{'course.'.$cid.'.domain'};
                   2852:     $cnum = $cnum || $ENV{'course.'.$cid.'.num'};
1.57      matthew  2853:     my $now = time;
1.35      matthew  2854:     #
                   2855:     my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
                   2856:     while (my ($student,$info) = each(%classlist)) {
1.60      matthew  2857:         if ($student =~ /^(con_lost|error|no_such_host)/i) {
                   2858:             &Apache::lonnet::logthis('get_classlist error for '.$cid.':'.$student);
                   2859:             return undef;
                   2860:         }
1.35      matthew  2861:         my ($sname,$sdom) = split(/:/,$student);
                   2862:         my @Values = split(/:/,$info);
1.136     raeburn  2863:         my ($end,$start,$id,$section,$fullname,$type,$lockedtype);
1.35      matthew  2864:         if (@Values > 2) {
1.136     raeburn  2865:             ($end,$start,$id,$section,$fullname,$type,$lockedtype) = @Values;
1.35      matthew  2866:         } else { # We have to get the data ourselves
                   2867:             ($end,$start) = @Values;
1.37      matthew  2868:             $section = &Apache::lonnet::getsection($sdom,$sname,$cid);
1.35      matthew  2869:             my %info=&Apache::lonnet::get('environment',
                   2870:                                           ['firstname','middlename',
                   2871:                                            'lastname','generation','id'],
                   2872:                                           $sdom, $sname);
                   2873:             my ($tmp) = keys(%info);
                   2874:             if ($tmp =~/^(con_lost|error|no_such_host)/i) {
                   2875:                 $fullname = 'not available';
                   2876:                 $id = 'not available';
1.38      matthew  2877:                 &Apache::lonnet::logthis('unable to retrieve environment '.
                   2878:                                          'for '.$sname.':'.$sdom);
1.35      matthew  2879:             } else {
1.141     albertel 2880:                 $fullname = &Apache::lonnet::format_name(@info{qw/firstname middlename lastname generation/},'lastname');
1.35      matthew  2881:                 $id = $info{'id'};
                   2882:             }
1.36      matthew  2883:             # Update the classlist with this students information
                   2884:             if ($fullname ne 'not available') {
1.141     albertel 2885: 		my $enrolldata = join(':',$end,$start,$id,$section,$fullname);
                   2886: 		my $reply=&Apache::lonnet::cput('classlist',
1.36      matthew  2887:                                                 {$student => $enrolldata},
                   2888:                                                 $cdom,$cnum);
                   2889:                 if ($reply !~ /^(ok|delayed)/) {
                   2890:                     &Apache::lonnet::logthis('Unable to update classlist for '.
                   2891:                                              'student '.$sname.':'.$sdom.
                   2892:                                              ' error:'.$reply);
                   2893:                 }
                   2894:             }
1.35      matthew  2895:         }
                   2896:         my $status='Expired';
                   2897:         if(((!$end) || $now < $end) && ((!$start) || ($now > $start))) {
                   2898:             $status='Active';
                   2899:         }
                   2900:         $classlist{$student} = 
1.136     raeburn  2901:             [$sdom,$sname,$end,$start,$id,$section,$fullname,$status,$type,$lockedtype];
1.35      matthew  2902:     }
                   2903:     if (wantarray()) {
                   2904:         return (\%classlist,['domain','username','end','start','id',
1.136     raeburn  2905:                              'section','fullname','status','type','lockedtype']);
1.35      matthew  2906:     } else {
                   2907:         return \%classlist;
                   2908:     }
                   2909: }
                   2910: 
1.1       stredwic 2911: # ----- END HELPER FUNCTIONS --------------------------------------------
                   2912: 
                   2913: 1;
                   2914: __END__
1.36      matthew  2915: 
1.35      matthew  2916: 

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