From d86b78dadf9ba8607c1c6d7b817b59d4fa0a06a2 Mon Sep 17 00:00:00 2001
From: Aaron Schulz <aaron@users.mediawiki.org>
Date: Thu, 25 Dec 2008 04:31:44 +0000
Subject: [PATCH] Add a little script I use to change db prefix

---
 maintenance/renameDbPrefix.php | 68 ++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 maintenance/renameDbPrefix.php

diff --git a/maintenance/renameDbPrefix.php b/maintenance/renameDbPrefix.php
new file mode 100644
index 0000000000..17568b4a04
--- /dev/null
+++ b/maintenance/renameDbPrefix.php
@@ -0,0 +1,68 @@
+<?php
+/**
+ * Run this script to after changing $wgDBPrefix on a wiki.
+ * The wiki will have to get downtime to do this correctly.
+ *
+ * @file
+ * @ingroup Maintenance
+ */
+$optionsWithArgs = array('old','new','help');
+
+require_once( 'commandLine.inc' );
+
+if( @$options['help'] || !isset($options['old']) || !isset($options['new']) ) {
+	print "usage:updateSpecialPages.php [--help] [--old x] [new y]\n";
+	print "  --help      : this help message\n";
+	print "  --old x       : old db prefix x\n";
+	print "  --old 0       : EMPTY old db prefix x\n";
+	print "  --new y       : new db prefix y\n";
+	print "  --new 0       : EMPTY new db prefix\n";
+	wfDie();
+}
+
+// Allow for no old prefix
+if( $options['old'] === '0' ) {
+	$old = '';
+} else {
+	// Use nice safe, sane, prefixes
+	preg_match( '/^[a-zA-Z]+_$/', $options['old'], $m );
+	$old = isset($m[0]) ? $m[0] : false;
+}
+// Allow for no new prefix
+if( $options['new'] === '0' ) {
+	$new = '';
+} else {
+	// Use nice safe, sane, prefixes
+	preg_match( '/^[a-zA-Z]+_$/', $options['new'], $m );
+	$new = isset($m[0]) ? $m[0] : false;
+}
+
+if( $old===false || $new===false ) {
+	print "Invalid prefix!\n";
+	wfDie();
+}
+if( $old === $new ) {
+	print "Same prefix. Nothing to rename!\n";
+	wfDie();
+}
+
+print "Renaming DB prefix for tables of $wgDBname from '$old' to '$new'\n";
+$count = 0;
+
+$dbw = wfGetDB( DB_MASTER );
+$res = $dbw->query( "SHOW TABLES LIKE '".$dbw->escapeLike($old)."%'" );
+foreach( $res as $row ) {
+	// XXX: odd syntax. MySQL outputs an oddly cased "Tables of X"
+	// sort of message. Best not to try $row->x stuff...
+	$fields = get_object_vars( $row );
+	// Silly for loop over one field...
+	foreach( $fields as $resName => $table ) {
+		// $old should be regexp safe ([a-zA-Z_])
+		$newTable = preg_replace( '/^'.$old.'/',$new,$table);
+		print "Renaming table $table to $newTable\n";
+		$dbw->query( "RENAME TABLE $table TO $newTable" );
+	}
+	$count++;
+}
+print "Done! [$count tables]\n";
+
-- 
2.20.1