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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @ingroup Maintenance
*/
/**
* When using shared tables that are referenced by foreign keys on local
* tables you have to change the constraints on local tables.
*
* The shared tables have to have GRANT REFERENCE on shared tables to local schema
* i.e.: GRANT REFERENCES (user_id) ON mwuser TO hubclient;
*/
require_once( dirname( __FILE__ ) . '/../Maintenance.php' );
class AlterSharedConstraints extends Maintenance {
public function __construct() {
parent::__construct();
$this->mDescription = "Alter foreign key to reference master tables in shared database setup.";
}
public function getDbType() {
return Maintenance::DB_ADMIN;
}
public function execute() {
global $wgSharedDB, $wgSharedTables, $wgSharedPrefix, $wgDBprefix;
if ( $wgSharedDB == null ) {
$this->output( "Database sharing is not enabled\n" );
return;
}
$dbw = wfGetDB( DB_MASTER );
foreach ( $wgSharedTables as $table ) {
$stable = $dbw->tableNameInternal($table);
if ( $wgSharedPrefix != null ) {
$ltable = preg_replace( "/^$wgSharedPrefix(.*)/i", "$wgDBprefix\\1", $stable );
} else {
$ltable = "{$wgDBprefix}{$stable}" ;
}
$result = $dbw->query( "SELECT uc.constraint_name, uc.table_name, ucc.column_name, uccpk.table_name pk_table_name, uccpk.column_name pk_column_name, uc.delete_rule, uc.deferrable, uc.deferred
FROM user_constraints uc, user_cons_columns ucc, user_cons_columns uccpk
WHERE uc.constraint_type = 'R'
AND ucc.constraint_name = uc.constraint_name
AND uccpk.constraint_name = uc.r_constraint_name
AND uccpk.table_name = '$ltable'" );
while (($row = $result->fetchRow()) !== false) {
$this->output( "Altering {$row['constraint_name']} ...");
try {
$dbw->query( "ALTER TABLE {$row['table_name']} DROP CONSTRAINT {$wgDBprefix}{$row['constraint_name']}" );
} catch (DBQueryError $exdb) {
if ($exdb->errno != 2443) {
throw $exdb;
}
}
$deleteRule = $row['delete_rule'] == 'NO ACTION' ? '' : "ON DELETE {$row['delete_rule']}";
$dbw->query( "ALTER TABLE {$row['table_name']} ADD CONSTRAINT {$wgDBprefix}{$row['constraint_name']}
FOREIGN KEY ({$row['column_name']})
REFERENCES {$wgSharedDB}.$stable({$row['pk_column_name']})
{$deleteRule} {$row['deferrable']} INITIALLY {$row['deferred']}" );
$this->output( "DONE\n" );
}
}
}
}
$maintClass = "AlterSharedConstraints";
require_once( RUN_MAINTENANCE_IF_MAIN );
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