File:
[LON-CAPA] /
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interface /
lonmysql.pm
Revision
1.35:
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Wed Aug 24 19:33:32 2005 UTC (18 years, 8 months ago) by
matthew
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CVS tags:
version_2_3_X,
version_2_3_2,
version_2_3_1,
version_2_3_0,
version_2_2_X,
version_2_2_99_1,
version_2_2_99_0,
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version_2_2_1,
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version_2_1_X,
version_2_1_99_3,
version_2_1_99_2,
version_2_1_99_1,
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version_2_1_2,
version_2_1_1,
version_2_1_0,
version_2_0_X,
version_2_0_99_1,
version_2_0_2,
version_2_0_1,
HEAD
A better fix for the last commit. No longer rely on hard-coded column names.
1: # The LearningOnline Network with CAPA
2: # MySQL utility functions
3: #
4: # $Id: lonmysql.pm,v 1.35 2005/08/24 19:33:32 matthew Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: ######################################################################
29:
30: package Apache::lonmysql;
31:
32: use strict;
33: use DBI;
34: use POSIX qw(strftime mktime);
35: use Apache::lonnet;
36:
37: my $mysqluser;
38: my $mysqlpassword;
39: my $mysqldatabase;
40: my %db_config;
41:
42: sub set_mysql_user_and_password {
43: # If we are running under Apache and LONCAPA, use the LON-CAPA
44: # user and password. Otherwise...? ? ? ?
45: my ($input_mysqluser,$input_mysqlpassword,$input_mysqldatabase) = @_;
46: if (! defined($mysqldatabase)) {
47: $mysqldatabase = 'loncapa';
48: }
49: if (defined($input_mysqldatabase)) {
50: $mysqldatabase = $input_mysqldatabase;
51: }
52: if (! defined($mysqluser) || ! defined($mysqlpassword)) {
53: if (! eval 'require Apache::lonnet();') {
54: $mysqluser = 'www';
55: $mysqlpassword = $Apache::lonnet::perlvar{'lonSqlAccess'};
56: } else {
57: $mysqluser = '';
58: $mysqlpassword = '';
59: }
60: }
61: if (defined($input_mysqluser)) {
62: $mysqluser = $input_mysqluser;
63: }
64: if (defined($input_mysqlpassword)) {
65: $mysqlpassword = $input_mysqlpassword;
66: }
67: }
68:
69: ######################################################################
70: ######################################################################
71:
72: =pod
73:
74: =head1 Name
75:
76: lonmysql - LONCAPA MySQL utility functions
77:
78: =head1 Synopsis
79:
80: lonmysql contains utility functions to make accessing the mysql loncapa
81: database easier.
82:
83: =head1 Description
84:
85: lonmysql does its best to encapsulate all the database/table functions
86: and provide a common interface. The goal, however, is not to provide
87: a complete reimplementation of the DBI interface. Instead we try to
88: make using mysql as painless as possible.
89:
90: Each table has a numeric ID that is a parameter to most lonmysql functions.
91: The table id is returned by &create_table.
92: If you lose the table id, it is lost forever.
93: The table names in MySQL correspond to
94: $env{'user.name'}.'_'.$env{'user.domain'}.'_'.$table_id. If the table id
95: is non-numeric, it is assumed to be the full name of a table. If you pass
96: the table id in a form, you MUST ensure that what you send to lonmysql is
97: numeric, otherwise you are opening up all the tables in the MySQL database.
98:
99: =over 4
100:
101: =item Creating a table
102:
103: To create a table, you need a description of its structure. See the entry
104: for &create_table for a description of what is needed.
105:
106: $table_id = &create_table({
107: id => 'tableid', # usually you will use the returned id
108: columns => (
109: { name => 'id',
110: type => 'INT',
111: restrictions => 'NOT NULL',
112: primary_key => 'yes',
113: auto_inc => 'yes'
114: },
115: { name => 'verbage',
116: type => 'TEXT' },
117: ),
118: fulltext => [qw/verbage/],
119: });
120:
121: The above command will create a table with two columns, 'id' and 'verbage'.
122:
123: 'id' will be an integer which is autoincremented and non-null.
124:
125: 'verbage' will be of type 'TEXT', which (conceivably) allows any length
126: text string to be stored. Depending on your intentions for this database,
127: setting restrictions => 'NOT NULL' may help you avoid storing empty data.
128:
129: the fulltext element sets up the 'verbage' column for 'FULLTEXT' searching.
130:
131:
132:
133: =item Storing rows
134:
135: Storing a row in a table requires calling &store_row($table_id,$data)
136:
137: $data is either a hash reference or an array reference. If it is an array
138: reference, the data is passed as is (after being escaped) to the
139: "INSERT INTO <table> VALUES( ... )" SQL command. If $data is a hash reference,
140: the data will be placed into an array in the proper column order for the table
141: and then passed to the database.
142:
143: An example of inserting into the table created above is:
144:
145: &store_row($table_id,[undef,'I am not a crackpot!']);
146:
147: or equivalently,
148:
149: &store_row($table_id,{ verbage => 'I am not a crackpot!'});
150:
151: Since the above table was created with the first column ('id') as
152: autoincrement, providing a value is unnecessary even though the column was
153: marked as 'NOT NULL'.
154:
155:
156:
157: =item Retrieving rows
158:
159: Retrieving rows requires calling get_rows:
160:
161: @row = &Apache::lonmysql::get_rows($table_id,$condition)
162:
163: This results in the query "SELECT * FROM <table> HAVING $condition".
164:
165: @row = &Apache::lonmysql::get_rows($table_id,'id>20');
166:
167: returns all rows with column 'id' greater than 20.
168:
169: =back
170:
171: =cut
172:
173: ######################################################################
174: ######################################################################
175: =pod
176:
177: =head1 Package Variables
178:
179: =over 4
180:
181: =cut
182:
183: ##################################################
184: ##################################################
185:
186: =pod
187:
188: =item %Tables
189:
190: Holds information regarding the currently open connections. Each key
191: in the %Tables hash will be a unique table key. The value associated
192: with a key is a hash reference. Most values are initialized when the
193: table is created.
194:
195: The following entries are allowed in the hash reference:
196:
197: =over 4
198:
199: =item Name
200:
201: Table name.
202:
203: =item Type
204:
205: The type of table, typically MyISAM.
206:
207: =item Row_format
208:
209: Describes how rows should be stored in the table. DYNAMIC or STATIC.
210:
211: =item Create_time
212:
213: The date of the tables creation.
214:
215: =item Update_time
216:
217: The date of the last modification of the table.
218:
219: =item Check_time
220:
221: Usually NULL.
222:
223: =item Avg_row_length
224:
225: The average length of the rows.
226:
227: =item Data_length
228:
229: The length of the data stored in the table (bytes)
230:
231: =item Max_data_length
232:
233: The maximum possible size of the table (bytes).
234:
235: =item Index_length
236:
237: The length of the index for the table (bytes)
238:
239: =item Data_free
240:
241: I have no idea what this is.
242:
243: =item Comment
244:
245: The comment associated with the table.
246:
247: =item Rows
248:
249: The number of rows in the table.
250:
251: =item Auto_increment
252:
253: The value of the next auto_increment field.
254:
255: =item Create_options
256:
257: I have no idea.
258:
259: =item Col_order
260:
261: an array reference which holds the order of columns in the table.
262:
263: =item row_insert_sth
264:
265: The statement handler for row inserts.
266:
267: =item row_replace_sth
268:
269: The statement handler for row inserts.
270:
271: =back
272:
273: Col_order and row_insert_sth are kept internally by lonmysql and are not
274: part of the usual MySQL table information.
275:
276: =cut
277:
278: ##################################################
279: ##################################################
280: my %Tables;
281:
282: ##################################################
283: ##################################################
284: =pod
285:
286: =item $errorstring
287:
288: Holds the last error.
289:
290: =cut
291: ##################################################
292: ##################################################
293: my $errorstring;
294:
295: ##################################################
296: ##################################################
297: =pod
298:
299: =item $debugstring
300:
301: Describes current events within the package.
302:
303: =cut
304: ##################################################
305: ##################################################
306: my $debugstring;
307:
308: ##################################################
309: ##################################################
310:
311: =pod
312:
313: =item $dbh
314:
315: The database handler; The actual connection to MySQL via the perl DBI.
316:
317: =cut
318:
319: ##################################################
320: ##################################################
321: my $dbh;
322:
323: ##################################################
324: ##################################################
325:
326: # End of global variable declarations
327:
328: =pod
329:
330: =back
331:
332: =cut
333:
334: ######################################################################
335: ######################################################################
336:
337: =pod
338:
339: =head1 Internals
340:
341: =over 4
342:
343: =cut
344:
345: ######################################################################
346: ######################################################################
347:
348: =pod
349:
350: =item &connect_to_db()
351:
352: Inputs: none.
353:
354: Returns: undef on error, 1 on success.
355:
356: Checks to make sure the database has been connected to. If not, the
357: connection is established.
358:
359: =cut
360:
361: ###############################
362: sub connect_to_db {
363: return 1 if ($dbh);
364: if (! defined($mysqluser) || ! defined($mysqlpassword)) {
365: &set_mysql_user_and_password();
366: }
367: if (! ($dbh = DBI->connect("DBI:mysql:$mysqldatabase",$mysqluser,$mysqlpassword,
368: { RaiseError=>0,PrintError=>0}))) {
369: $debugstring = "Unable to connect to loncapa database.";
370: if (! defined($dbh)) {
371: $debugstring = "Unable to connect to loncapa database.";
372: $errorstring = "dbh was undefined.";
373: } elsif ($dbh->err) {
374: $errorstring = "Connection error: ".$dbh->errstr;
375: }
376: return undef;
377: }
378: $debugstring = "Successfully connected to loncapa database.";
379: # Determine DB configuration
380: undef(%db_config);
381: my $sth = $dbh->prepare("SHOW VARIABLES");
382: $sth->execute();
383: if ($sth->err()) {
384: $debugstring = "Unable to retrieve db config variables";
385: return undef;
386: }
387: foreach my $row (@{$sth->fetchall_arrayref}) {
388: $db_config{$row->[0]} = $row->[1];
389: }
390: #&Apache::lonnet::logthis("MySQL configuration variables");
391: #while (my ($k,$v) = each(%db_config)) {
392: # &Apache::lonnet::logthis(" '$k' => '$v'");
393: #}
394: #
395: return 1;
396: }
397:
398: ###############################
399:
400: =pod
401:
402: =item &verify_sql_connection()
403:
404: Inputs: none.
405:
406: Returns: 0 (failure) or 1 (success)
407:
408: Checks to make sure the database can be connected to. It does not
409: initialize anything in the lonmysql package.
410:
411: =cut
412:
413: ###############################
414: sub verify_sql_connection {
415: if (! defined($mysqluser) || ! defined($mysqlpassword)) {
416: &set_mysql_user_and_password();
417: }
418: my $connection;
419: if (! ($connection = DBI->connect("DBI:mysql:loncapa",
420: $mysqluser,$mysqlpassword,
421: { RaiseError=>0,PrintError=>0}))) {
422: return 0;
423: }
424: undef($connection);
425: return 1;
426: }
427:
428: ###############################
429:
430: =pod
431:
432: =item &disconnect_from_db()
433:
434: Inputs: none.
435:
436: Returns: Always returns 1.
437:
438: Severs the connection to the mysql database.
439:
440: =cut
441:
442: ###############################
443: sub disconnect_from_db {
444: foreach (keys(%Tables)) {
445: # Supposedly, having statement handlers running around after the
446: # database connection has been lost will cause trouble. So we
447: # kill them off just to be sure.
448: if (exists($Tables{$_}->{'row_insert_sth'})) {
449: delete($Tables{$_}->{'row_insert_sth'});
450: }
451: if (exists($Tables{$_}->{'row_replace_sth'})) {
452: delete($Tables{$_}->{'row_replace_sth'});
453: }
454: }
455: $dbh->disconnect if ($dbh);
456: $debugstring = "Disconnected from database.";
457: $dbh = undef;
458: return 1;
459: }
460:
461: ###############################
462:
463: =pod
464:
465: =item &number_of_rows()
466:
467: Input: table identifier
468:
469: Returns: the number of rows in the given table, undef on error.
470:
471: =cut
472:
473: ###############################
474: sub number_of_rows {
475: my ($table_id) = @_;
476: return undef if (! defined(&connect_to_db()));
477: return undef if (! defined(&update_table_info($table_id)));
478: return $Tables{&translate_id($table_id)}->{'Rows'};
479: }
480: ###############################
481:
482: =pod
483:
484: =item &get_dbh()
485:
486: Input: nothing
487:
488: Returns: the database handler, or undef on error.
489:
490: This routine allows the programmer to gain access to the database handler.
491: Be careful.
492:
493: =cut
494:
495: ###############################
496: sub get_dbh {
497: return undef if (! defined(&connect_to_db()));
498: return $dbh;
499: }
500:
501: ###############################
502:
503: =pod
504:
505: =item &get_error()
506:
507: Inputs: none.
508:
509: Returns: The last error reported.
510:
511: =cut
512:
513: ###############################
514: sub get_error {
515: return $errorstring;
516: }
517:
518: ###############################
519:
520: =pod
521:
522: =item &get_debug()
523:
524: Inputs: none.
525:
526: Returns: A string describing the internal state of the lonmysql package.
527:
528: =cut
529:
530: ###############################
531: sub get_debug {
532: return $debugstring;
533: }
534:
535: ###############################
536:
537: =pod
538:
539: =item &update_table_info()
540:
541: Inputs: table id
542:
543: Returns: undef on error, 1 on success.
544:
545: &update_table_info updates the %Tables hash with current information about
546: the given table.
547:
548: The default MySQL table status fields are:
549:
550: Name Type Row_format
551: Max_data_length Index_length Data_free
552: Create_time Update_time Check_time
553: Avg_row_length Data_length Comment
554: Rows Auto_increment Create_options
555:
556: Additionally, "Col_order" is updated as well.
557:
558: =cut
559:
560: ###############################
561: sub update_table_info {
562: my ($table_id) = @_;
563: return undef if (! defined(&connect_to_db()));
564: my $table_status = &check_table($table_id);
565: return undef if (! defined($table_status));
566: if (! $table_status) {
567: $errorstring = "table $table_id does not exist.";
568: return undef;
569: }
570: my $tablename = &translate_id($table_id);
571: #
572: # Get MySQLs table status information.
573: #
574: my $db_command = "SHOW TABLE STATUS FROM loncapa LIKE '$tablename'";
575: my $sth = $dbh->prepare($db_command);
576: $sth->execute();
577: if ($sth->err) {
578: $errorstring = "$dbh ATTEMPTED:\n".$db_command."\nRESULTING ERROR:\n".
579: $sth->errstr;
580: &disconnect_from_db();
581: return undef;
582: }
583: my @column_name = @{$sth->{NAME}};
584: #
585: my @info=$sth->fetchrow_array;
586: for (my $i=0;$i<= $#info ; $i++) {
587: if ($column_name[$i] =~ /^(Create_|Update_|Check_)time$/) {
588: $Tables{$tablename}->{$column_name[$i]}=
589: &unsqltime($info[$i]);
590: } else {
591: $Tables{$tablename}->{$column_name[$i]}= $info[$i];
592: }
593: }
594: #
595: # Determine the column order
596: #
597: $db_command = "DESCRIBE $tablename";
598: $sth = $dbh->prepare($db_command);
599: $sth->execute();
600: if ($sth->err) {
601: $errorstring = "$dbh ATTEMPTED:\n".$db_command."\nRESULTING ERROR:\n".
602: $sth->errstr;
603: &disconnect_from_db();
604: return undef;
605: }
606: my $aref=$sth->fetchall_arrayref;
607: $Tables{$tablename}->{'Col_order'}=[]; # Clear values.
608: # The values we want are the 'Field' entries, the first column.
609: for (my $i=0;$i< @$aref ; $i++) {
610: push @{$Tables{$tablename}->{'Col_order'}},$aref->[$i]->[0];
611: }
612: #
613: $debugstring = "Retrieved table info for $tablename";
614: return 1;
615: }
616:
617: ###############################
618:
619: =pod
620:
621: =item &table_information()
622:
623: Inputs: table id
624:
625: Returns: hash with the table status
626:
627: =cut
628:
629: ###############################
630: sub table_information {
631: my $table_id=shift;
632: if (&update_table_info($table_id)) {
633: return %{$Tables{$table_id}};
634: } else {
635: return ();
636: }
637: }
638:
639: ###############################
640:
641: =pod
642:
643: =item &col_order()
644:
645: Inputs: table id
646:
647: Returns: array with column order
648:
649: =cut
650:
651: ###############################
652: sub col_order {
653: my $table_id=shift;
654: if (&update_table_info($table_id)) {
655: return @{$Tables{$table_id}->{'Col_order'}};
656: } else {
657: return ();
658: }
659: }
660:
661: ###############################
662:
663: =pod
664:
665: =item &create_table()
666:
667: Inputs:
668: table description, see &build_table_creation_request
669: Returns:
670: undef on error, table id on success.
671:
672: =cut
673:
674: ###############################
675: sub create_table {
676: return undef if (!defined(&connect_to_db($dbh)));
677: my ($table_des)=@_;
678: my ($request,$table_id) = &build_table_creation_request($table_des);
679: #
680: # Execute the request to create the table
681: #############################################
682: my $count = $dbh->do($request);
683: if (! defined($count)) {
684: $errorstring = "$dbh ATTEMPTED:\n".$request."\nRESULTING ERROR:\n".
685: $dbh->errstr();
686: return undef;
687: }
688: my $tablename = &translate_id($table_id);
689: delete($Tables{$tablename}) if (exists($Tables{$tablename}));
690: return undef if (! defined(&update_table_info($table_id)));
691: $debugstring = "Created table $tablename at time ".time.
692: " with request\n$request";
693: return $table_id;
694: }
695:
696: ###############################
697:
698: =pod
699:
700: =item build_table_creation_request
701:
702: Input: table description
703:
704: table description = {
705: permanent => 'yes' or 'no',
706: columns => [
707: { name => 'colA',
708: type => mysql type,
709: restrictions => 'NOT NULL' or empty,
710: primary_key => 'yes' or empty,
711: auto_inc => 'yes' or empty,
712: },
713: { name => 'colB',
714: ...
715: },
716: { name => 'colC',
717: ...
718: },
719: ],
720: 'PRIMARY KEY' => (index_col_name,...),
721: KEY => [{ name => 'idx_name',
722: columns => (col1,col2,..),},],
723: INDEX => [{ name => 'idx_name',
724: columns => (col1,col2,..),},],
725: UNIQUE => [{ index => 'yes',
726: name => 'idx_name',
727: columns => (col1,col2,..),},],
728: FULLTEXT => [{ index => 'yes',
729: name => 'idx_name',
730: columns => (col1,col2,..),},],
731:
732: }
733:
734: Returns: scalar string containing mysql commands to create the table
735:
736: =cut
737:
738: ###############################
739: sub build_table_creation_request {
740: my ($table_des)=@_;
741: #
742: # Build request to create table
743: ##################################
744: my @Columns;
745: my $col_des;
746: my $table_id;
747: if (exists($table_des->{'id'})) {
748: $table_id = $table_des->{'id'};
749: } else {
750: $table_id = &get_new_table_id();
751: }
752: my $tablename = &translate_id($table_id);
753: my $request = "CREATE TABLE IF NOT EXISTS ".$tablename." ";
754: foreach my $coldata (@{$table_des->{'columns'}}) {
755: my $column = $coldata->{'name'};
756: next if (! defined($column));
757: $col_des = '';
758: if (lc($coldata->{'type'}) =~ /(enum|set)/) { # 'enum' or 'set'
759: $col_des.=$column." ".$coldata->{'type'}."('".
760: join("', '",@{$coldata->{'values'}})."')";
761: } else {
762: $col_des.=$column." ".$coldata->{'type'};
763: if (exists($coldata->{'size'})) {
764: $col_des.="(".$coldata->{'size'}.")";
765: }
766: }
767: # Modifiers
768: if (exists($coldata->{'restrictions'})){
769: $col_des.=" ".$coldata->{'restrictions'};
770: }
771: if (exists($coldata->{'default'})) {
772: $col_des.=" DEFAULT '".$coldata->{'default'}."'";
773: }
774: $col_des.=' AUTO_INCREMENT' if (exists($coldata->{'auto_inc'}) &&
775: ($coldata->{'auto_inc'} eq 'yes'));
776: $col_des.=' PRIMARY KEY' if (exists($coldata->{'primary_key'}) &&
777: ($coldata->{'primary_key'} eq 'yes'));
778: } continue {
779: # skip blank items.
780: push (@Columns,$col_des) if ($col_des ne '');
781: }
782: if (exists($table_des->{'PRIMARY KEY'})) {
783: push (@Columns,'PRIMARY KEY ('.join(',',@{$table_des->{'PRIMARY KEY'}})
784: .')');
785: }
786: #
787: foreach my $indextype ('KEY','INDEX') {
788: next if (!exists($table_des->{$indextype}));
789: foreach my $indexdescription (@{$table_des->{$indextype}}) {
790: my $text = $indextype.' ';
791: if (exists($indexdescription->{'name'})) {
792: $text .=$indexdescription->{'name'};
793: }
794: $text .= ' ('.join(',',@{$indexdescription->{'columns'}}).')';
795: push (@Columns,$text);
796: }
797: }
798: #
799: foreach my $indextype ('UNIQUE','FULLTEXT') {
800: next if (! exists($table_des->{$indextype}));
801: foreach my $indexdescription (@{$table_des->{$indextype}}) {
802: my $text = $indextype.' ';
803: if (exists($indexdescription->{'index'}) &&
804: $indexdescription->{'index'} eq 'yes') {
805: $text .= 'INDEX ';
806: }
807: if (exists($indexdescription->{'name'})) {
808: $text .=$indexdescription->{'name'};
809: }
810: $text .= ' ('.join(',',@{$indexdescription->{'columns'}}).')';
811: push (@Columns,$text);
812: }
813: }
814: #
815: $request .= "(".join(", ",@Columns).") ";
816: unless($table_des->{'permanent'} eq 'yes') {
817: $request.="COMMENT = 'temporary' ";
818: }
819: $request .= "TYPE=MYISAM";
820: return $request,$table_id;
821: }
822:
823: ###############################
824:
825: =pod
826:
827: =item &get_new_table_id()
828:
829: Used internally to prevent table name collisions.
830:
831: =cut
832:
833: ###############################
834: sub get_new_table_id {
835: my $newid = 0;
836: my @tables = &tables_in_db();
837: foreach (@tables) {
838: if (/^$env{'user.name'}_$env{'user.domain'}_(\d+)$/) {
839: $newid = $1 if ($1 > $newid);
840: }
841: }
842: return ++$newid;
843: }
844:
845: ###############################
846:
847: =pod
848:
849: =item &get_rows()
850:
851: Inputs: $table_id,$condition
852:
853: Returns: undef on error, an array ref to (array of) results on success.
854:
855: Internally, this function does a 'SELECT * FROM table WHERE $condition'.
856: $condition = 'id>0' will result in all rows where column 'id' has a value
857: greater than 0 being returned.
858:
859: =cut
860:
861: ###############################
862: sub get_rows {
863: my ($table_id,$condition) = @_;
864: return undef if (! defined(&connect_to_db()));
865: my $table_status = &check_table($table_id);
866: return undef if (! defined($table_status));
867: if (! $table_status) {
868: $errorstring = "table $table_id does not exist.";
869: return undef;
870: }
871: my $tablename = &translate_id($table_id);
872: my $request;
873: if (defined($condition) && $condition ne '') {
874: $request = 'SELECT * FROM '.$tablename.' WHERE '.$condition;
875: } else {
876: $request = 'SELECT * FROM '.$tablename;
877: $condition = 'no condition';
878: }
879: my $sth=$dbh->prepare($request);
880: $sth->execute();
881: if ($sth->err) {
882: $errorstring = "$dbh ATTEMPTED:\n".$request."\nRESULTING ERROR:\n".
883: $sth->errstr;
884: $debugstring = "Failed to get rows matching $condition";
885: return undef;
886: }
887: $debugstring = "Got rows matching $condition";
888: my @Results = @{$sth->fetchall_arrayref};
889: return @Results;
890: }
891:
892: ###############################
893:
894: =pod
895:
896: =item &store_row()
897:
898: Inputs: table id, row data
899:
900: returns undef on error, 1 on success.
901:
902: =cut
903:
904: ###############################
905: sub store_row {
906: my ($table_id,$rowdata) = @_;
907: #
908: return undef if (! defined(&connect_to_db()));
909: my $table_status = &check_table($table_id);
910: return undef if (! defined($table_status));
911: if (! $table_status) {
912: $errorstring = "table $table_id does not exist.";
913: return undef;
914: }
915: #
916: my $tablename = &translate_id($table_id);
917: #
918: my $sth;
919: if (exists($Tables{$tablename}->{'row_insert_sth'})) {
920: $sth = $Tables{$tablename}->{'row_insert_sth'};
921: } else {
922: # Build the insert statement handler
923: return undef if (! defined(&update_table_info($table_id)));
924: my $insert_request = 'INSERT INTO '.$tablename.' VALUES(';
925: foreach (@{$Tables{$tablename}->{'Col_order'}}) {
926: $insert_request.="?,";
927: }
928: chop $insert_request;
929: $insert_request.=")";
930: $sth=$dbh->prepare($insert_request);
931: $Tables{$tablename}->{'row_insert_sth'}=$sth;
932: }
933: my @Parameters;
934: if (ref($rowdata) eq 'ARRAY') {
935: @Parameters = @$rowdata;
936: } elsif (ref($rowdata) eq 'HASH') {
937: foreach (@{$Tables{$tablename}->{'Col_order'}}) {
938: push(@Parameters,$rowdata->{$_});
939: }
940: }
941: $sth->execute(@Parameters);
942: if ($sth->err) {
943: $errorstring = "$dbh ATTEMPTED insert @Parameters RESULTING ERROR:\n".
944: $sth->errstr;
945: return undef;
946: }
947: $debugstring = "Stored row.";
948: return 1;
949: }
950:
951:
952: ###############################
953:
954: =pod
955:
956: =item &bulk_store_rows()
957:
958: Inputs: table id, [columns],[[row data1].[row data2],...]
959:
960: returns undef on error, 1 on success.
961:
962: =cut
963:
964: ###############################
965: sub bulk_store_rows {
966: my ($table_id,$columns,$rows) = @_;
967: #
968: return undef if (! defined(&connect_to_db()));
969: my $dbh = &get_dbh();
970: return undef if (! defined($dbh));
971: my $table_status = &check_table($table_id);
972: return undef if (! defined($table_status));
973: if (! $table_status) {
974: $errorstring = "table $table_id does not exist.";
975: return undef;
976: }
977: #
978: my $tablename = &translate_id($table_id);
979: #
980: my $request = 'INSERT IGNORE INTO '.$tablename.' ';
981: if (defined($columns) && ref($columns) eq 'ARRAY') {
982: $request .= join(',',@$columns).' ';
983: }
984: if (! defined($rows) || ref($rows) ne 'ARRAY') {
985: $errorstring = "no input rows given.";
986: return undef;
987: }
988: $request .= 'VALUES ';
989: foreach my $row (@$rows) {
990: # avoid doing row stuff here...
991: $request .= '('.join(',',@$row).'),';
992: }
993: $request =~ s/,$//;
994: # $debugstring = "Executed ".$/.$request; # commented out - this is big
995: $dbh->do($request);
996: if ($dbh->err) {
997: $errorstring = 'Attempted '.$/.$request.$/.'Got error '.$dbh->errstr();
998: return undef;
999: }
1000: return 1;
1001: }
1002:
1003:
1004: ###############################
1005:
1006: =pod
1007:
1008: =item &replace_row()
1009:
1010: Inputs: table id, row data
1011:
1012: returns undef on error, 1 on success.
1013:
1014: Acts like &store_row() but uses the 'REPLACE' command instead of 'INSERT'.
1015:
1016: =cut
1017:
1018: ###############################
1019: sub replace_row {
1020: my ($table_id,$rowdata) = @_;
1021: #
1022: return undef if (! defined(&connect_to_db()));
1023: my $table_status = &check_table($table_id);
1024: return undef if (! defined($table_status));
1025: if (! $table_status) {
1026: $errorstring = "table $table_id does not exist.";
1027: return undef;
1028: }
1029: #
1030: my $tablename = &translate_id($table_id);
1031: #
1032: my $sth;
1033: if (exists($Tables{$tablename}->{'row_replace_sth'})) {
1034: $sth = $Tables{$tablename}->{'row_replace_sth'};
1035: } else {
1036: # Build the insert statement handler
1037: return undef if (! defined(&update_table_info($table_id)));
1038: my $replace_request = 'REPLACE INTO '.$tablename.' VALUES(';
1039: foreach (@{$Tables{$tablename}->{'Col_order'}}) {
1040: $replace_request.="?,";
1041: }
1042: chop $replace_request;
1043: $replace_request.=")";
1044: $sth=$dbh->prepare($replace_request);
1045: $Tables{$tablename}->{'row_replace_sth'}=$sth;
1046: }
1047: my @Parameters;
1048: if (ref($rowdata) eq 'ARRAY') {
1049: @Parameters = @$rowdata;
1050: } elsif (ref($rowdata) eq 'HASH') {
1051: foreach (@{$Tables{$tablename}->{'Col_order'}}) {
1052: push(@Parameters,$rowdata->{$_});
1053: }
1054: }
1055: $sth->execute(@Parameters);
1056: if ($sth->err) {
1057: $errorstring = "$dbh ATTEMPTED replace @Parameters RESULTING ERROR:\n".
1058: $sth->errstr;
1059: return undef;
1060: }
1061: $debugstring = "Stored row.";
1062: return 1;
1063: }
1064:
1065: ###########################################
1066:
1067: =pod
1068:
1069: =item &tables_in_db()
1070:
1071: Returns a list containing the names of all the tables in the database.
1072: Returns undef on error.
1073:
1074: =cut
1075:
1076: ###########################################
1077: sub tables_in_db {
1078: return undef if (!defined(&connect_to_db()));
1079: my $sth=$dbh->prepare('SHOW TABLES');
1080: $sth->execute();
1081: $sth->execute();
1082: my $aref = $sth->fetchall_arrayref;
1083: if ($sth->err()) {
1084: $errorstring =
1085: "$dbh ATTEMPTED:\n".'fetchall_arrayref after SHOW TABLES'.
1086: "\nRESULTING ERROR:\n".$sth->errstr;
1087: return undef;
1088: }
1089: my @table_list;
1090: foreach (@$aref) {
1091: push(@table_list,$_->[0]);
1092: }
1093: $debugstring = "Got list of tables in DB: ".join(',',@table_list);
1094: return(@table_list);
1095: }
1096:
1097: ###########################################
1098:
1099: =pod
1100:
1101: =item &translate_id()
1102:
1103: Used internally to translate a numeric table id into a MySQL table name.
1104: If the input $id contains non-numeric characters it is assumed to have
1105: already been translated.
1106:
1107: Checks are NOT performed to see if the table actually exists.
1108:
1109: =cut
1110:
1111: ###########################################
1112: sub translate_id {
1113: my $id = shift;
1114: # id should be a digit. If it is not a digit we assume the given id
1115: # is complete and does not need to be translated.
1116: return $id if ($id =~ /\D/);
1117: return $env{'user.name'}.'_'.$env{'user.domain'}.'_'.$id;
1118: }
1119:
1120: ###########################################
1121:
1122: =pod
1123:
1124: =item &check_table()
1125:
1126: Input: table id
1127:
1128: Checks to see if the requested table exists. Returns 0 (no), 1 (yes), or
1129: undef (error).
1130:
1131: =cut
1132:
1133: ###########################################
1134: sub check_table {
1135: my $table_id = shift;
1136: return undef if (!defined(&connect_to_db()));
1137: #
1138: $table_id = &translate_id($table_id);
1139: my @Table_list = &tables_in_db();
1140: my $result = 0;
1141: foreach (@Table_list) {
1142: if ($_ eq $table_id) {
1143: $result = 1;
1144: last;
1145: }
1146: }
1147: # If it does not exist, make sure we do not have it listed in %Tables
1148: delete($Tables{$table_id}) if ((! $result) && exists($Tables{$table_id}));
1149: $debugstring = "check_table returned $result for $table_id";
1150: return $result;
1151: }
1152:
1153: ###########################################
1154:
1155: =pod
1156:
1157: =item &remove_from_table()
1158:
1159: Input: $table_id, $column, $value
1160:
1161: Returns: the number of rows deleted. undef on error.
1162:
1163: Executes a "delete from $tableid where $column like binary '$value'".
1164:
1165: =cut
1166:
1167: ###########################################
1168: sub remove_from_table {
1169: my ($table_id,$column,$value) = @_;
1170: return undef if (!defined(&connect_to_db()));
1171: #
1172: $table_id = &translate_id($table_id);
1173: my $command = 'DELETE FROM '.$table_id.' WHERE '.$column.
1174: " LIKE BINARY ".$dbh->quote($value);
1175: my $sth = $dbh->prepare($command);
1176: unless ($sth->execute()) {
1177: $errorstring = "ERROR on execution of ".$command."\n".$sth->errstr;
1178: return undef;
1179: }
1180: $debugstring = $command;
1181: my $rows = $sth->rows;
1182: return $rows;
1183: }
1184:
1185: ###########################################
1186:
1187: =pod
1188:
1189: =item drop_table($table_id)
1190:
1191: Issues a 'drop table if exists' command
1192:
1193: =cut
1194:
1195: ###########################################
1196:
1197: sub drop_table {
1198: my ($table_id) = @_;
1199: return undef if (!defined(&connect_to_db()));
1200: #
1201: $table_id = &translate_id($table_id);
1202: my $command = 'DROP TABLE IF EXISTS '.$table_id;
1203: my $sth = $dbh->prepare($command);
1204: $sth->execute();
1205: if ($sth->err) {
1206: $errorstring = "ERROR on execution of ".$command."\n".$sth->errstr;
1207: return undef;
1208: }
1209: $debugstring = $command;
1210: delete($Tables{$table_id}); # remove any knowledge of the table
1211: return 1; # if we got here there was no error, so return a 'true' value
1212: }
1213:
1214: ##########################################
1215:
1216: =pod
1217:
1218: =item fix_table_name
1219:
1220: Fixes a table name so that it will work with MySQL.
1221:
1222: =cut
1223:
1224: ##########################################
1225: sub fix_table_name {
1226: my ($name) = @_;
1227: $name =~ s/^(\d+[eE]\d+)/_$1/;
1228: return $name;
1229: }
1230:
1231:
1232: # ---------------------------- convert 'time' format into a datetime sql format
1233: sub sqltime {
1234: my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) =
1235: localtime(&unsqltime($_[0]));
1236: $mon++; $year+=1900;
1237: return "$year-$mon-$mday $hour:$min:$sec";
1238: }
1239:
1240: sub maketime {
1241: my %th=@_;
1242: return POSIX::mktime(($th{'seconds'},$th{'minutes'},$th{'hours'},
1243: $th{'day'},$th{'month'}-1,
1244: $th{'year'}-1900,0,0,$th{'dlsav'}));
1245: }
1246:
1247:
1248: #########################################
1249: #
1250: # Retro-fixing of un-backward-compatible time format
1251:
1252: sub unsqltime {
1253: my $timestamp=shift;
1254: if ($timestamp=~/^(\d+)\-(\d+)\-(\d+)\s+(\d+)\:(\d+)\:(\d+)$/) {
1255: $timestamp=&maketime('year'=>$1,'month'=>$2,'day'=>$3,
1256: 'hours'=>$4,'minutes'=>$5,'seconds'=>$6);
1257: }
1258: return $timestamp;
1259: }
1260:
1261:
1262: 1;
1263:
1264: __END__;
1265:
1266: =pod
1267:
1268: =back
1269:
1270: =cut
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