wikimedia / mediawiki

maintenance/oracle/alterSharedConstraints.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 32 and the first side effect is on line 30.

/**
 * 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
 *
 * @file
 * @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 __DIR__ . '/../Maintenance.php';

class AlterSharedConstraints extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->addDescription( '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 = $this->getDB( DB_MASTER );
		foreach ( $wgSharedTables as $table ) {
			$stable = $dbw->tableNameInternal( $table );

The method tableNameInternal() does not exist on Database. Did you maybe mean tableName()?

			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;