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<?php |
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/** |
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* Change the prefix of database tables. |
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* Run this script to after changing $wgDBprefix on a wiki. |
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* The wiki will have to get downtime to do this correctly. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* http://www.gnu.org/copyleft/gpl.html |
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* |
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* @file |
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* @ingroup Maintenance |
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*/ |
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require_once __DIR__ . '/Maintenance.php'; |
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/** |
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* Maintenance script that changes the prefix of database tables. |
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* |
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* @ingroup Maintenance |
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*/ |
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class RenameDbPrefix extends Maintenance { |
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public function __construct() { |
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parent::__construct(); |
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$this->addOption( "old", "Old db prefix [0 for none]", true, true ); |
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$this->addOption( "new", "New db prefix [0 for none]", true, true ); |
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} |
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public function getDbType() { |
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return Maintenance::DB_ADMIN; |
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} |
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public function execute() { |
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global $wgDBname; |
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// Allow for no old prefix |
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View Code Duplication |
if ( $this->getOption( 'old', 0 ) === '0' ) { |
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$old = ''; |
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} else { |
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// Use nice safe, sane, prefixes |
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preg_match( '/^[a-zA-Z]+_$/', $this->getOption( 'old' ), $m ); |
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$old = isset( $m[0] ) ? $m[0] : false; |
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} |
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// Allow for no new prefix |
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View Code Duplication |
if ( $this->getOption( 'new', 0 ) === '0' ) { |
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$new = ''; |
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} else { |
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// Use nice safe, sane, prefixes |
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preg_match( '/^[a-zA-Z]+_$/', $this->getOption( 'new' ), $m ); |
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$new = isset( $m[0] ) ? $m[0] : false; |
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} |
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if ( $old === false || $new === false ) { |
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$this->error( "Invalid prefix!", true ); |
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} |
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if ( $old === $new ) { |
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$this->output( "Same prefix. Nothing to rename!\n", true ); |
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} |
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$this->output( "Renaming DB prefix for tables of $wgDBname from '$old' to '$new'\n" ); |
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$count = 0; |
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$dbw = $this->getDB( DB_MASTER ); |
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$res = $dbw->query( "SHOW TABLES " . $dbw->buildLike( $old, $dbw->anyString() ) ); |
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foreach ( $res as $row ) { |
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// XXX: odd syntax. MySQL outputs an oddly cased "Tables of X" |
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// sort of message. Best not to try $row->x stuff... |
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$fields = get_object_vars( $row ); |
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// Silly for loop over one field... |
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foreach ( $fields as $table ) { |
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// $old should be regexp safe ([a-zA-Z_]) |
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$newTable = preg_replace( '/^' . $old . '/', $new, $table ); |
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$this->output( "Renaming table $table to $newTable\n" ); |
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$dbw->query( "RENAME TABLE $table TO $newTable" ); |
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} |
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$count++; |
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} |
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$this->output( "Done! [$count tables]\n" ); |
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} |
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} |
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$maintClass = "RenameDbPrefix"; |
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require_once RUN_MAINTENANCE_IF_MAIN; |
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wikimedia /
mediawiki
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.