includes/installer/MysqlInstaller.php

   1 <?php
   2 /**
   3  * MySQL-specific installer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * Class for setting up the MediaWiki database using MySQL.
  26  *
  27  * @ingroup Deployment
  28  * @since 1.17
  29  */
  30 class MysqlInstaller extends DatabaseInstaller {
  31
  32         protected $globalNames = array(
  33                 'wgDBserver',
  34                 'wgDBname',
  35                 'wgDBuser',
  36                 'wgDBpassword',
  37                 'wgDBprefix',
  38                 'wgDBTableOptions',
  39                 'wgDBmysql5',
  40         );
  41
  42         protected $internalDefaults = array(
  43                 '_MysqlEngine' => 'InnoDB',
  44                 '_MysqlCharset' => 'binary',
  45                 '_InstallUser' => 'root',
  46         );
  47
  48         public $supportedEngines = array( 'InnoDB', 'MyISAM' );
  49
  50         public $minimumVersion = '5.0.2';
  51
  52         public $webUserPrivs = array(
  53                 'DELETE',
  54                 'INSERT',
  55                 'SELECT',
  56                 'UPDATE',
  57                 'CREATE TEMPORARY TABLES',
  58         );
  59
  60         /**
  61          * @return string
  62          */
  63         public function getName() {
  64                 return 'mysql';
  65         }
  66
  67         public function __construct( $parent ) {
  68                 parent::__construct( $parent );
  69         }
  70
  71         /**
  72          * @return Bool
  73          */
  74         public function isCompiled() {
  75                 return self::checkExtension( 'mysql' );
  76         }
  77
  78         /**
  79          * @return array
  80          */
  81         public function getGlobalDefaults() {
  82                 return array();
  83         }
  84
  85         /**
  86          * @return string
  87          */
  88         public function getConnectForm() {
  89                 return
  90                         $this->getTextBox( 'wgDBserver', 'config-db-host', array(), $this->parent->getHelpBox( 'config-db-host-help' ) ) .
  91                         Html::openElement( 'fieldset' ) .
  92                         Html::element( 'legend', array(), wfMessage( 'config-db-wiki-settings' )->text() ) .
  93                         $this->getTextBox( 'wgDBname', 'config-db-name', array( 'dir' => 'ltr' ), $this->parent->getHelpBox( 'config-db-name-help' ) ) .
  94                         $this->getTextBox( 'wgDBprefix', 'config-db-prefix', array( 'dir' => 'ltr' ), $this->parent->getHelpBox( 'config-db-prefix-help' ) ) .
  95                         Html::closeElement( 'fieldset' ) .
  96                         $this->getInstallUserBox();
  97         }
  98
  99         public function submitConnectForm() {
 100                 // Get variables from the request.
 101                 $newValues = $this->setVarsFromRequest( array( 'wgDBserver', 'wgDBname', 'wgDBprefix' ) );
 102
 103                 // Validate them.
 104                 $status = Status::newGood();
 105                 if ( !strlen( $newValues['wgDBserver'] ) ) {
 106                         $status->fatal( 'config-missing-db-host' );
 107                 }
 108                 if ( !strlen( $newValues['wgDBname'] ) ) {
 109                         $status->fatal( 'config-missing-db-name' );
 110                 } elseif ( !preg_match( '/^[a-z0-9+_-]+$/i', $newValues['wgDBname'] ) ) {
 111                         $status->fatal( 'config-invalid-db-name', $newValues['wgDBname'] );
 112                 }
 113                 if ( !preg_match( '/^[a-z0-9_-]*$/i', $newValues['wgDBprefix'] ) ) {
 114                         $status->fatal( 'config-invalid-db-prefix', $newValues['wgDBprefix'] );
 115                 }
 116                 if ( !$status->isOK() ) {
 117                         return $status;
 118                 }
 119
 120                 // Submit user box
 121                 $status = $this->submitInstallUserBox();
 122                 if ( !$status->isOK() ) {
 123                         return $status;
 124                 }
 125
 126                 // Try to connect
 127                 $status = $this->getConnection();
 128                 if ( !$status->isOK() ) {
 129                         return $status;
 130                 }
 131                 /**
 132                  * @var $conn DatabaseBase
 133                  */
 134                 $conn = $status->value;
 135
 136                 // Check version
 137                 $version = $conn->getServerVersion();
 138                 if ( version_compare( $version, $this->minimumVersion ) < 0 ) {
 139                         return Status::newFatal( 'config-mysql-old', $this->minimumVersion, $version );
 140                 }
 141
 142                 return $status;
 143         }
 144
 145         /**
 146          * @return Status
 147          */
 148         public function openConnection() {
 149                 $status = Status::newGood();
 150                 try {
 151                         $db = new DatabaseMysql(
 152                                 $this->getVar( 'wgDBserver' ),
 153                                 $this->getVar( '_InstallUser' ),
 154                                 $this->getVar( '_InstallPassword' ),
 155                                 false,
 156                                 false,
 157                                 0,
 158                                 $this->getVar( 'wgDBprefix' )
 159                         );
 160                         $status->value = $db;
 161                 } catch ( DBConnectionError $e ) {
 162                         $status->fatal( 'config-connection-error', $e->getMessage() );
 163                 }
 164                 return $status;
 165         }
 166
 167         public function preUpgrade() {
 168                 global $wgDBuser, $wgDBpassword;
 169
 170                 $status = $this->getConnection();
 171                 if ( !$status->isOK() ) {
 172                         $this->parent->showStatusError( $status );
 173                         return;
 174                 }
 175                 /**
 176                  * @var $conn DatabaseBase
 177                  */
 178                 $conn = $status->value;
 179                 $conn->selectDB( $this->getVar( 'wgDBname' ) );
 180
 181                 # Determine existing default character set
 182                 if ( $conn->tableExists( "revision", __METHOD__ ) ) {
 183                         $revision = $conn->buildLike( $this->getVar( 'wgDBprefix' ) . 'revision' );
 184                         $res = $conn->query( "SHOW TABLE STATUS $revision", __METHOD__ );
 185                         $row = $conn->fetchObject( $res );
 186                         if ( !$row ) {
 187                                 $this->parent->showMessage( 'config-show-table-status' );
 188                                 $existingSchema = false;
 189                                 $existingEngine = false;
 190                         } else {
 191                                 if ( preg_match( '/^latin1/', $row->Collation ) ) {
 192                                         $existingSchema = 'latin1';
 193                                 } elseif ( preg_match( '/^utf8/', $row->Collation ) ) {
 194                                         $existingSchema = 'utf8';
 195                                 } elseif ( preg_match( '/^binary/', $row->Collation ) ) {
 196                                         $existingSchema = 'binary';
 197                                 } else {
 198                                         $existingSchema = false;
 199                                         $this->parent->showMessage( 'config-unknown-collation' );
 200                                 }
 201                                 if ( isset( $row->Engine ) ) {
 202                                         $existingEngine = $row->Engine;
 203                                 } else {
 204                                         $existingEngine = $row->Type;
 205                                 }
 206                         }
 207                 } else {
 208                         $existingSchema = false;
 209                         $existingEngine = false;
 210                 }
 211
 212                 if ( $existingSchema && $existingSchema != $this->getVar( '_MysqlCharset' ) ) {
 213                         $this->setVar( '_MysqlCharset', $existingSchema );
 214                 }
 215                 if ( $existingEngine && $existingEngine != $this->getVar( '_MysqlEngine' ) ) {
 216                         $this->setVar( '_MysqlEngine', $existingEngine );
 217                 }
 218
 219                 # Normal user and password are selected after this step, so for now
 220                 # just copy these two
 221                 $wgDBuser = $this->getVar( '_InstallUser' );
 222                 $wgDBpassword = $this->getVar( '_InstallPassword' );
 223         }
 224
 225         /**
 226          * Get a list of storage engines that are available and supported
 227          *
 228          * @return array
 229          */
 230         public function getEngines() {
 231                 $status = $this->getConnection();
 232
 233                 /**
 234                  * @var $conn DatabaseBase
 235                  */
 236                 $conn = $status->value;
 237
 238                 $engines = array();
 239                 $res = $conn->query( 'SHOW ENGINES', __METHOD__ );
 240                 foreach ( $res as $row ) {
 241                         if ( $row->Support == 'YES' || $row->Support == 'DEFAULT' ) {
 242                                 $engines[] = $row->Engine;
 243                         }
 244                 }
 245                 $engines = array_intersect( $this->supportedEngines, $engines );
 246                 return $engines;
 247         }
 248
 249         /**
 250          * Get a list of character sets that are available and supported
 251          *
 252          * @return array
 253          */
 254         public function getCharsets() {
 255                 return array( 'binary', 'utf8' );
 256         }
 257
 258         /**
 259          * Return true if the install user can create accounts
 260          *
 261          * @return bool
 262          */
 263         public function canCreateAccounts() {
 264                 $status = $this->getConnection();
 265                 if ( !$status->isOK() ) {
 266                         return false;
 267                 }
 268                 /**
 269                  * @var $conn DatabaseBase
 270                  */
 271                 $conn = $status->value;
 272
 273                 // Get current account name
 274                 $currentName = $conn->selectField( '', 'CURRENT_USER()', '', __METHOD__ );
 275                 $parts = explode( '@', $currentName );
 276                 if ( count( $parts ) != 2 ) {
 277                         return false;
 278                 }
 279                 $quotedUser = $conn->addQuotes( $parts[0] ) .
 280                         '@' . $conn->addQuotes( $parts[1] );
 281
 282                 // The user needs to have INSERT on mysql.* to be able to CREATE USER
 283                 // The grantee will be double-quoted in this query, as required
 284                 $res = $conn->select( 'INFORMATION_SCHEMA.USER_PRIVILEGES', '*',
 285                         array( 'GRANTEE' => $quotedUser ), __METHOD__ );
 286                 $insertMysql = false;
 287                 $grantOptions = array_flip( $this->webUserPrivs );
 288                 foreach ( $res as $row ) {
 289                         if ( $row->PRIVILEGE_TYPE == 'INSERT' ) {
 290                                 $insertMysql = true;
 291                         }
 292                         if ( $row->IS_GRANTABLE ) {
 293                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 294                         }
 295                 }
 296
 297                 // Check for DB-specific privs for mysql.*
 298                 if ( !$insertMysql ) {
 299                         $row = $conn->selectRow( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 300                                 array(
 301                                         'GRANTEE' => $quotedUser,
 302                                         'TABLE_SCHEMA' => 'mysql',
 303                                         'PRIVILEGE_TYPE' => 'INSERT',
 304                                 ), __METHOD__ );
 305                         if ( $row ) {
 306                                 $insertMysql = true;
 307                         }
 308                 }
 309
 310                 if ( !$insertMysql ) {
 311                         return false;
 312                 }
 313
 314                 // Check for DB-level grant options
 315                 $res = $conn->select( 'INFORMATION_SCHEMA.SCHEMA_PRIVILEGES', '*',
 316                         array(
 317                                 'GRANTEE' => $quotedUser,
 318                                 'IS_GRANTABLE' => 1,
 319                         ), __METHOD__ );
 320                 foreach ( $res as $row ) {
 321                         $regex = $conn->likeToRegex( $row->TABLE_SCHEMA );
 322                         if ( preg_match( $regex, $this->getVar( 'wgDBname' ) ) ) {
 323                                 unset( $grantOptions[$row->PRIVILEGE_TYPE] );
 324                         }
 325                 }
 326                 if ( count( $grantOptions ) ) {
 327                         // Can't grant everything
 328                         return false;
 329                 }
 330                 return true;
 331         }
 332
 333         /**
 334          * @return string
 335          */
 336         public function getSettingsForm() {
 337                 if ( $this->canCreateAccounts() ) {
 338                         $noCreateMsg = false;
 339                 } else {
 340                         $noCreateMsg = 'config-db-web-no-create-privs';
 341                 }
 342                 $s = $this->getWebUserBox( $noCreateMsg );
 343
 344                 // Do engine selector
 345                 $engines = $this->getEngines();
 346                 // If the current default engine is not supported, use an engine that is
 347                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 348                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 349                 }
 350
 351                 $s .= Xml::openElement( 'div', array(
 352                         'id' => 'dbMyisamWarning'
 353                 ));
 354                 $s .= $this->parent->getWarningBox( wfMessage( 'config-mysql-myisam-dep' )->text() );
 355                 $s .= Xml::closeElement( 'div' );
 356
 357                 if( $this->getVar( '_MysqlEngine' ) != 'MyISAM' ) {
 358                         $s .= Xml::openElement( 'script', array( 'type' => 'text/javascript' ) );
 359                         $s .= '$(\'#dbMyisamWarning\').hide();';
 360                         $s .= Xml::closeElement( 'script' );
 361                 }
 362
 363                 if ( count( $engines ) >= 2 ) {
 364                         // getRadioSet() builds a set of labeled radio buttons.
 365                         // For grep: The following messages are used as the item labels:
 366                         // config-mysql-innodb, config-mysql-myisam
 367                         $s .= $this->getRadioSet( array(
 368                                 'var' => '_MysqlEngine',
 369                                 'label' => 'config-mysql-engine',
 370                                 'itemLabelPrefix' => 'config-mysql-',
 371                                 'values' => $engines,
 372                                 'itemAttribs' => array(
 373                                         'MyISAM' => array(
 374                                                 'class' => 'showHideRadio',
 375                                                 'rel'   => 'dbMyisamWarning'),
 376                                         'InnoDB' => array(
 377                                                 'class' => 'hideShowRadio',
 378                                                 'rel'   => 'dbMyisamWarning')
 379                         )));
 380                         $s .= $this->parent->getHelpBox( 'config-mysql-engine-help' );
 381                 }
 382
 383                 // If the current default charset is not supported, use a charset that is
 384                 $charsets = $this->getCharsets();
 385                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 386                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 387                 }
 388
 389                 // Do charset selector
 390                 if ( count( $charsets ) >= 2 ) {
 391                         // getRadioSet() builds a set of labeled radio buttons.
 392                         // For grep: The following messages are used as the item labels:
 393                         // config-mysql-binary, config-mysql-utf8
 394                         $s .= $this->getRadioSet( array(
 395                                 'var' => '_MysqlCharset',
 396                                 'label' => 'config-mysql-charset',
 397                                 'itemLabelPrefix' => 'config-mysql-',
 398                                 'values' => $charsets
 399                         ));
 400                         $s .= $this->parent->getHelpBox( 'config-mysql-charset-help' );
 401                 }
 402
 403                 return $s;
 404         }
 405
 406         /**
 407          * @return Status
 408          */
 409         public function submitSettingsForm() {
 410                 $this->setVarsFromRequest( array( '_MysqlEngine', '_MysqlCharset' ) );
 411                 $status = $this->submitWebUserBox();
 412                 if ( !$status->isOK() ) {
 413                         return $status;
 414                 }
 415
 416                 // Validate the create checkbox
 417                 $canCreate = $this->canCreateAccounts();
 418                 if ( !$canCreate ) {
 419                         $this->setVar( '_CreateDBAccount', false );
 420                         $create = false;
 421                 } else {
 422                         $create = $this->getVar( '_CreateDBAccount' );
 423                 }
 424
 425                 if ( !$create ) {
 426                         // Test the web account
 427                         try {
 428                                 new DatabaseMysql(
 429                                         $this->getVar( 'wgDBserver' ),
 430                                         $this->getVar( 'wgDBuser' ),
 431                                         $this->getVar( 'wgDBpassword' ),
 432                                         false,
 433                                         false,
 434                                         0,
 435                                         $this->getVar( 'wgDBprefix' )
 436                                 );
 437                         } catch ( DBConnectionError $e ) {
 438                                 return Status::newFatal( 'config-connection-error', $e->getMessage() );
 439                         }
 440                 }
 441
 442                 // Validate engines and charsets
 443                 // This is done pre-submit already so it's just for security
 444                 $engines = $this->getEngines();
 445                 if ( !in_array( $this->getVar( '_MysqlEngine' ), $engines ) ) {
 446                         $this->setVar( '_MysqlEngine', reset( $engines ) );
 447                 }
 448                 $charsets = $this->getCharsets();
 449                 if ( !in_array( $this->getVar( '_MysqlCharset' ), $charsets ) ) {
 450                         $this->setVar( '_MysqlCharset', reset( $charsets ) );
 451                 }
 452                 return Status::newGood();
 453         }
 454
 455         public function preInstall() {
 456                 # Add our user callback to installSteps, right before the tables are created.
 457                 $callback = array(
 458                         'name' => 'user',
 459                         'callback' => array( $this, 'setupUser' ),
 460                 );
 461                 $this->parent->addInstallStep( $callback, 'tables' );
 462         }
 463
 464         /**
 465          * @return Status
 466          */
 467         public function setupDatabase() {
 468                 $status = $this->getConnection();
 469                 if ( !$status->isOK() ) {
 470                         return $status;
 471                 }
 472                 $conn = $status->value;
 473                 $dbName = $this->getVar( 'wgDBname' );
 474                 if( !$conn->selectDB( $dbName ) ) {
 475                         $conn->query( "CREATE DATABASE " . $conn->addIdentifierQuotes( $dbName ), __METHOD__ );
 476                         $conn->selectDB( $dbName );
 477                 }
 478                 $this->setupSchemaVars();
 479                 return $status;
 480         }
 481
 482         /**
 483          * @return Status
 484          */
 485         public function setupUser() {
 486                 $dbUser = $this->getVar( 'wgDBuser' );
 487                 if( $dbUser == $this->getVar( '_InstallUser' ) ) {
 488                         return Status::newGood();
 489                 }
 490                 $status = $this->getConnection();
 491                 if ( !$status->isOK() ) {
 492                         return $status;
 493                 }
 494
 495                 $this->setupSchemaVars();
 496                 $dbName = $this->getVar( 'wgDBname' );
 497                 $this->db->selectDB( $dbName );
 498                 $server = $this->getVar( 'wgDBserver' );
 499                 $password = $this->getVar( 'wgDBpassword' );
 500                 $grantableNames = array();
 501
 502                 if ( $this->getVar( '_CreateDBAccount' ) ) {
 503                         // Before we blindly try to create a user that already has access,
 504                         try { // first attempt to connect to the database
 505                                 new DatabaseMysql(
 506                                         $server,
 507                                         $dbUser,
 508                                         $password,
 509                                         false,
 510                                         false,
 511                                         0,
 512                                         $this->getVar( 'wgDBprefix' )
 513                                 );
 514                                 $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 515                                 $tryToCreate = false;
 516                         } catch ( DBConnectionError $e ) {
 517                                 $tryToCreate = true;
 518                         }
 519                 } else {
 520                         $grantableNames[] = $this->buildFullUserName( $dbUser, $server );
 521                         $tryToCreate = false;
 522                 }
 523
 524                 if( $tryToCreate ) {
 525                         $createHostList = array(
 526                                 $server,
 527                                 'localhost',
 528                                 'localhost.localdomain',
 529                                 '%'
 530                         );
 531
 532                         $createHostList = array_unique( $createHostList );
 533                         $escPass = $this->db->addQuotes( $password );
 534
 535                         foreach( $createHostList as $host ) {
 536                                 $fullName = $this->buildFullUserName( $dbUser, $host );
 537                                 if( !$this->userDefinitelyExists( $dbUser, $host ) ) {
 538                                         try{
 539                                                 $this->db->begin( __METHOD__ );
 540                                                 $this->db->query( "CREATE USER $fullName IDENTIFIED BY $escPass", __METHOD__ );
 541                                                 $this->db->commit( __METHOD__ );
 542                                                 $grantableNames[] = $fullName;
 543                                         } catch( DBQueryError $dqe ) {
 544                                                 if( $this->db->lastErrno() == 1396 /* ER_CANNOT_USER */ ) {
 545                                                         // User (probably) already exists
 546                                                         $this->db->rollback( __METHOD__ );
 547                                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 548                                                         $grantableNames[] = $fullName;
 549                                                         break;
 550                                                 } else {
 551                                                         // If we couldn't create for some bizzare reason and the
 552                                                         // user probably doesn't exist, skip the grant
 553                                                         $this->db->rollback( __METHOD__ );
 554                                                         $status->warning( 'config-install-user-create-failed', $dbUser, $dqe->getText() );
 555                                                 }
 556                                         }
 557                                 } else {
 558                                         $status->warning( 'config-install-user-alreadyexists', $dbUser );
 559                                         $grantableNames[] = $fullName;
 560                                         break;
 561                                 }
 562                         }
 563                 }
 564
 565                 // Try to grant to all the users we know exist or we were able to create
 566                 $dbAllTables = $this->db->addIdentifierQuotes( $dbName ) . '.*';
 567                 foreach( $grantableNames as $name ) {
 568                         try {
 569                                 $this->db->begin( __METHOD__ );
 570                                 $this->db->query( "GRANT ALL PRIVILEGES ON $dbAllTables TO $name", __METHOD__ );
 571                                 $this->db->commit( __METHOD__ );
 572                         } catch( DBQueryError $dqe ) {
 573                                 $this->db->rollback( __METHOD__ );
 574                                 $status->fatal( 'config-install-user-grant-failed', $dbUser, $dqe->getText() );
 575                         }
 576                 }
 577
 578                 return $status;
 579         }
 580
 581         /**
 582          * Return a formal 'User'@'Host' username for use in queries
 583          * @param string $name Username, quotes will be added
 584          * @param string $host Hostname, quotes will be added
 585          * @return String
 586          */
 587         private function buildFullUserName( $name, $host ) {
 588                 return $this->db->addQuotes( $name ) . '@' . $this->db->addQuotes( $host );
 589         }
 590
 591         /**
 592          * Try to see if the user account exists. Our "superuser" may not have
 593          * access to mysql.user, so false means "no" or "maybe"
 594          * @param string $host Hostname to check
 595          * @param string $user Username to check
 596          * @return boolean
 597          */
 598         private function userDefinitelyExists( $host, $user ) {
 599                 try {
 600                         $res = $this->db->selectRow( 'mysql.user', array( 'Host', 'User' ),
 601                                 array( 'Host' => $host, 'User' => $user ), __METHOD__ );
 602                         return (bool)$res;
 603                 } catch( DBQueryError $dqe ) {
 604                         return false;
 605                 }
 606
 607         }
 608
 609         /**
 610          * Return any table options to be applied to all tables that don't
 611          * override them.
 612          *
 613          * @return String
 614          */
 615         protected function getTableOptions() {
 616                 $options = array();
 617                 if ( $this->getVar( '_MysqlEngine' ) !== null ) {
 618                         $options[] = "ENGINE=" . $this->getVar( '_MysqlEngine' );
 619                 }
 620                 if ( $this->getVar( '_MysqlCharset' ) !== null ) {
 621                         $options[] = 'DEFAULT CHARSET=' . $this->getVar( '_MysqlCharset' );
 622                 }
 623                 return implode( ', ', $options );
 624         }
 625
 626         /**
 627          * Get variables to substitute into tables.sql and the SQL patch files.
 628          *
 629          * @return array
 630          */
 631         public function getSchemaVars() {
 632                 return array(
 633                         'wgDBTableOptions' => $this->getTableOptions(),
 634                         'wgDBname' => $this->getVar( 'wgDBname' ),
 635                         'wgDBuser' => $this->getVar( 'wgDBuser' ),
 636                         'wgDBpassword' => $this->getVar( 'wgDBpassword' ),
 637                 );
 638         }
 639
 640         public function getLocalSettings() {
 641                 $dbmysql5 = wfBoolToStr( $this->getVar( 'wgDBmysql5', true ) );
 642                 $prefix = LocalSettingsGenerator::escapePhpString( $this->getVar( 'wgDBprefix' ) );
 643                 $tblOpts = LocalSettingsGenerator::escapePhpString( $this->getTableOptions() );
 644                 return
 645 "# MySQL specific settings
 646 \$wgDBprefix = \"{$prefix}\";
 647
 648 # MySQL table options to use during installation or update
 649 \$wgDBTableOptions = \"{$tblOpts}\";
 650
 651 # Experimental charset support for MySQL 5.0.
 652 \$wgDBmysql5 = {$dbmysql5};";
 653         }
 654 }