maintenance/oracle/alterSharedConstraints.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @ingroup Maintenance
  20  */
  21
  22 /**
  23  * When using shared tables that are referenced by foreign keys on local
  24  * tables you have to change the constraints on local tables.
  25  *
  26  * The shared tables have to have GRANT REFERENCE on shared tables to local schema
  27  * i.e.: GRANT REFERENCES (user_id) ON mwuser TO hubclient;
  28  */
  29
  30 require_once( __DIR__ . '/../Maintenance.php' );
  31
  32 class AlterSharedConstraints extends Maintenance {
  33         public function __construct() {
  34                 parent::__construct();
  35                 $this->mDescription = "Alter foreign key to reference master tables in shared database setup.";
  36         }
  37
  38         public function getDbType() {
  39                 return Maintenance::DB_ADMIN;
  40         }
  41
  42         public function execute() {
  43                 global $wgSharedDB, $wgSharedTables, $wgSharedPrefix, $wgDBprefix;
  44
  45                 if ( $wgSharedDB == null ) {
  46                         $this->output( "Database sharing is not enabled\n" );
  47                         return;
  48                 }
  49
  50                 $dbw = wfGetDB( DB_MASTER );
  51                 foreach ( $wgSharedTables as $table ) {
  52                         $stable = $dbw->tableNameInternal($table);
  53                         if ( $wgSharedPrefix != null ) {
  54                                 $ltable = preg_replace( "/^$wgSharedPrefix(.*)/i", "$wgDBprefix\\1", $stable );
  55                         } else {
  56                                 $ltable = "{$wgDBprefix}{$stable}" ;
  57                         }
  58
  59                         $result = $dbw->query( "SELECT uc.constraint_name, uc.table_name, ucc.column_name, uccpk.table_name pk_table_name, uccpk.column_name pk_column_name, uc.delete_rule, uc.deferrable, uc.deferred
  60                                           FROM user_constraints uc, user_cons_columns ucc, user_cons_columns uccpk
  61                                          WHERE uc.constraint_type = 'R'
  62                                            AND ucc.constraint_name = uc.constraint_name
  63                                            AND uccpk.constraint_name = uc.r_constraint_name
  64                                            AND uccpk.table_name = '$ltable'" );
  65                         while (($row = $result->fetchRow()) !== false) {
  66
  67                                         $this->output( "Altering {$row['constraint_name']} ...");
  68
  69                                         try {
  70                                                 $dbw->query( "ALTER TABLE {$row['table_name']} DROP CONSTRAINT {$wgDBprefix}{$row['constraint_name']}" );
  71                                         } catch (DBQueryError $exdb) {
  72                                                 if ($exdb->errno != 2443) {
  73                                                         throw $exdb;
  74                                                 }
  75                                         }
  76
  77                                         $deleteRule = $row['delete_rule'] == 'NO ACTION' ? '' : "ON DELETE {$row['delete_rule']}";
  78                                         $dbw->query( "ALTER TABLE {$row['table_name']} ADD CONSTRAINT {$wgDBprefix}{$row['constraint_name']}
  79                                                 FOREIGN KEY ({$row['column_name']})
  80                                                 REFERENCES {$wgSharedDB}.$stable({$row['pk_column_name']})
  81                                                 {$deleteRule} {$row['deferrable']} INITIALLY {$row['deferred']}" );
  82
  83                                         $this->output( "DONE\n" );
  84                         }
  85                 }
  86         }
  87
  88 }
  89
  90 $maintClass = "AlterSharedConstraints";
  91 require_once( RUN_MAINTENANCE_IF_MAIN );