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  * @ingroup Maintenance
  19  */
  20
  21 /**
  22  * When using shared tables that are referenced by foreign keys on local
  23  * tables you have to change the constraints on local tables.
  24  *
  25  * The shared tables have to have GRANT REFERENCE on shared tables to local schema
  26  * i.e.: GRANT REFERENCES (user_id) ON mwuser TO hubclient;
  27  */
  28
  29 require_once( __DIR__ . '/../Maintenance.php' );
  30
  31 class AlterSharedConstraints extends Maintenance {
  32         public function __construct() {
  33                 parent::__construct();
  34                 $this->mDescription = "Alter foreign key to reference master tables in shared database setup.";
  35         }
  36
  37         public function getDbType() {
  38                 return Maintenance::DB_ADMIN;
  39         }
  40
  41         public function execute() {
  42                 global $wgSharedDB, $wgSharedTables, $wgSharedPrefix, $wgDBprefix;
  43
  44                 if ( $wgSharedDB == null ) {
  45                         $this->output( "Database sharing is not enabled\n" );
  46                         return;
  47                 }
  48
  49                 $dbw = wfGetDB( DB_MASTER );
  50                 foreach ( $wgSharedTables as $table ) {
  51                         $stable = $dbw->tableNameInternal($table);
  52                         if ( $wgSharedPrefix != null ) {
  53                                 $ltable = preg_replace( "/^$wgSharedPrefix(.*)/i", "$wgDBprefix\\1", $stable );
  54                         } else {
  55                                 $ltable = "{$wgDBprefix}{$stable}" ;
  56                         }
  57
  58                         $result = $dbw->query( "SELECT uc.constraint_name, uc.table_name, ucc.column_name, uccpk.table_name pk_table_name, uccpk.column_name pk_column_name, uc.delete_rule, uc.deferrable, uc.deferred
  59                                           FROM user_constraints uc, user_cons_columns ucc, user_cons_columns uccpk
  60                                          WHERE uc.constraint_type = 'R'
  61                                            AND ucc.constraint_name = uc.constraint_name
  62                                            AND uccpk.constraint_name = uc.r_constraint_name
  63                                            AND uccpk.table_name = '$ltable'" );
  64                         while (($row = $result->fetchRow()) !== false) {
  65
  66                                         $this->output( "Altering {$row['constraint_name']} ...");
  67
  68                                         try {
  69                                                 $dbw->query( "ALTER TABLE {$row['table_name']} DROP CONSTRAINT {$wgDBprefix}{$row['constraint_name']}" );
  70                                         } catch (DBQueryError $exdb) {
  71                                                 if ($exdb->errno != 2443) {
  72                                                         throw $exdb;
  73                                                 }
  74                                         }
  75
  76                                         $deleteRule = $row['delete_rule'] == 'NO ACTION' ? '' : "ON DELETE {$row['delete_rule']}";
  77                                         $dbw->query( "ALTER TABLE {$row['table_name']} ADD CONSTRAINT {$wgDBprefix}{$row['constraint_name']}
  78                                                 FOREIGN KEY ({$row['column_name']})
  79                                                 REFERENCES {$wgSharedDB}.$stable({$row['pk_column_name']})
  80                                                 {$deleteRule} {$row['deferrable']} INITIALLY {$row['deferred']}" );
  81
  82                                         $this->output( "DONE\n" );
  83                         }
  84                 }
  85         }
  86
  87 }
  88
  89 $maintClass = "AlterSharedConstraints";
  90 require_once( RUN_MAINTENANCE_IF_MAIN );