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Diff for /loncom/interface/lonmysql.pm between versions 1.34 and 1.41

version 1.34, 2005/08/24 19:21:05 version 1.41, 2019/11/20 18:02:55
Line 87  and provide a common interface.  The goa Line 87  and provide a common interface.  The goa
 a complete reimplementation of the DBI interface.  Instead we try to   a complete reimplementation of the DBI interface.  Instead we try to 
 make using mysql as painless as possible.  make using mysql as painless as possible.
   
 Each table has a numeric ID that is a parameter to most lonmysql functions.  Each table has a numeric ID that is a parameter to most lonmysql
 The table id is returned by &create_table.    functions.  The table id is returned by &create_table.  If you lose
 If you lose the table id, it is lost forever.  the table id, it is lost forever.  The table names in MySQL correspond
 The table names in MySQL correspond to   to $env{'user.name'}.'_'.$env{'user.domain'}.'_'.$table_id. (With all
 $env{'user.name'}.'_'.$env{'user.domain'}.'_'.$table_id.  If the table id   non-word characters removed form user.name and user.domain) If the
 is non-numeric, it is assumed to be the full name of a table.  If you pass  table id is non-numeric, it is assumed to be the full name of a table.
 the table id in a form, you MUST ensure that what you send to lonmysql is  If you pass the table id in a form, you MUST ensure that what you send
 numeric, otherwise you are opening up all the tables in the MySQL database.  to lonmysql is numeric, otherwise you are opening up all the tables in
   the MySQL database.
   
 =over 4  =over 4
   
Line 571  sub update_table_info { Line 572  sub update_table_info {
     #      #
     # Get MySQLs table status information.      # Get MySQLs table status information.
     #      #
     my @tabledesc;  
     my ($major_version) = ($db_config{'version'} =~ /^(\d)\./);  
     if ($major_version <= 3) {  
         @tabledesc = qw/  
             Name Type Row_format Rows Avg_row_length Data_length  
             Max_data_length Index_length Data_free Auto_increment   
             Create_time Update_time Check_time Create_options Comment/;  
     } else { # At least 4 has this structure...  
         @tabledesc = qw/  
             Name Engine Version Row_format Rows Avg_row_length Data_length  
             Max_data_length Index_length Data_free Auto_increment Create_time   
             Update_time Check_time Collation Checksum Create_options Comment/;  
     }  
     my $db_command = "SHOW TABLE STATUS FROM loncapa LIKE '$tablename'";      my $db_command = "SHOW TABLE STATUS FROM loncapa LIKE '$tablename'";
     my $sth = $dbh->prepare($db_command);      my $sth = $dbh->prepare($db_command);
     $sth->execute();      $sth->execute();
Line 593  sub update_table_info { Line 581  sub update_table_info {
         &disconnect_from_db();          &disconnect_from_db();
         return undef;          return undef;
     }      }
       my @column_name = @{$sth->{NAME}};
     #      #
     my @info=$sth->fetchrow_array;      my @info=$sth->fetchrow_array;
     for (my $i=0;$i<= $#info ; $i++) {      for (my $i=0;$i<= $#info ; $i++) {
         if ($tabledesc[$i] !~ /^(Create_|Update_|Check_)time$/) {          if ($column_name[$i] =~ /^(Create_|Update_|Check_)time$/) {
             $Tables{$tablename}->{$tabledesc[$i]}=               $Tables{$tablename}->{$column_name[$i]}= 
                 &unsqltime($info[$i]);                  &unsqltime($info[$i]);
         } else {          } else {
             $Tables{$tablename}->{$tabledesc[$i]}= $info[$i];              $Tables{$tablename}->{$column_name[$i]}= $info[$i];
         }          }
     }      }
     #      #
Line 828  sub build_table_creation_request { Line 817  sub build_table_creation_request {
     unless($table_des->{'permanent'} eq 'yes') {      unless($table_des->{'permanent'} eq 'yes') {
         $request.="COMMENT = 'temporary' ";          $request.="COMMENT = 'temporary' ";
     }       } 
     $request .= "TYPE=MYISAM";      $request .= "ENGINE=MYISAM";
     return $request,$table_id;      return $request,$table_id;
 }  }
   
Line 836  sub build_table_creation_request { Line 825  sub build_table_creation_request {
   
 =pod  =pod
   
   =item &get_table_prefix()
   
   returns the cleaned version of user.name and user.domain for us in table names
   
   =cut
   
   ###############################
   sub get_table_prefix {
       my $clean_name   = $env{'user.name'};
       my $clean_domain = $env{'user.domain'};
       $clean_name =~ s/\W//g;
       $clean_domain =~ s/\W//g;
       return $clean_name.'_'.$clean_domain.'_';
   }
   
   ###############################
   
   =pod
   
 =item &get_new_table_id()  =item &get_new_table_id()
   
 Used internally to prevent table name collisions.  Used internally to prevent table name collisions.
Line 846  Used internally to prevent table name co Line 854  Used internally to prevent table name co
 sub get_new_table_id {  sub get_new_table_id {
     my $newid = 0;      my $newid = 0;
     my @tables = &tables_in_db();      my @tables = &tables_in_db();
       my $prefix = &get_table_prefix();
     foreach (@tables) {      foreach (@tables) {
         if (/^$env{'user.name'}_$env{'user.domain'}_(\d+)$/) {          if (/^\Q$prefix\E(\d+)$/) {
             $newid = $1 if ($1 > $newid);              $newid = $1 if ($1 > $newid);
         }          }
     }      }
Line 1086  Returns undef on error. Line 1095  Returns undef on error.
 =cut  =cut
   
 ###########################################  ###########################################
   
   ########## Show-Tables Cache
   my $have_read_tables = 0;
   my $dbh_sth;
   ##########
   
 sub tables_in_db {  sub tables_in_db {
     return undef if (!defined(&connect_to_db()));      return undef if (!defined(&connect_to_db()));
     my $sth=$dbh->prepare('SHOW TABLES');      
     $sth->execute();      ########## Show-Tables Cache
     $sth->execute();      if(!$have_read_tables) { 
     my $aref = $sth->fetchall_arrayref;       $dbh_sth=$dbh->prepare('SHOW TABLES');
     if ($sth->err()) {       $have_read_tables = 1;
       }   
       $dbh_sth->execute();
       #$dbh_sth->execute(); # Removed strange execute - from release 119
       ##########    
       
       my $aref = $dbh_sth->fetchall_arrayref;
       if ($dbh_sth->err()) {
         $errorstring =           $errorstring = 
             "$dbh ATTEMPTED:\n".'fetchall_arrayref after SHOW TABLES'.              "$dbh ATTEMPTED:\n".'fetchall_arrayref after SHOW TABLES'.
             "\nRESULTING ERROR:\n".$sth->errstr;              "\nRESULTING ERROR:\n".$dbh_sth->errstr;
         return undef;          return undef;
     }      }
     my @table_list;      my @table_list;
Line 1126  sub translate_id { Line 1148  sub translate_id {
     # id should be a digit.  If it is not a digit we assume the given id      # id should be a digit.  If it is not a digit we assume the given id
     # is complete and does not need to be translated.      # is complete and does not need to be translated.
     return $id if ($id =~ /\D/);        return $id if ($id =~ /\D/);  
     return $env{'user.name'}.'_'.$env{'user.domain'}.'_'.$id;      return &get_table_prefix().$id;
 }  }
   
 ###########################################  ###########################################
Line 1237  Fixes a table name so that it will work Line 1259  Fixes a table name so that it will work
 sub fix_table_name {  sub fix_table_name {
     my ($name) = @_;      my ($name) = @_;
     $name =~ s/^(\d+[eE]\d+)/_$1/;      $name =~ s/^(\d+[eE]\d+)/_$1/;
       $name =~ s/\W//g;
     return $name;      return $name;
 }  }
   
Line 1265  sub unsqltime { Line 1288  sub unsqltime {
     my $timestamp=shift;      my $timestamp=shift;
     if ($timestamp=~/^(\d+)\-(\d+)\-(\d+)\s+(\d+)\:(\d+)\:(\d+)$/) {      if ($timestamp=~/^(\d+)\-(\d+)\-(\d+)\s+(\d+)\:(\d+)\:(\d+)$/) {
         $timestamp=&maketime('year'=>$1,'month'=>$2,'day'=>$3,          $timestamp=&maketime('year'=>$1,'month'=>$2,'day'=>$3,
                              'hours'=>$4,'minutes'=>$5,'seconds'=>$6);                               'hours'=>$4,'minutes'=>$5,'seconds'=>$6,'dlsav'=>-1);
     }      }
     return $timestamp;      return $timestamp;
 }  }
Removed from v.1.34  
changed lines
  Added in v.1.41

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