includes/db/DatabaseSqlite.php

   1 <?php
   2 /**
   3  * This is the SQLite database abstraction layer.
   4  * See maintenance/sqlite/README for development notes and other specific information
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  * @ingroup Database
  23  */
  24
  25 /**
  26  * @ingroup Database
  27  */
  28 class DatabaseSqlite extends DatabaseBase {
  29
  30         private static $fulltextEnabled = null;
  31
  32         var $mAffectedRows;
  33         var $mLastResult;
  34         var $mDatabaseFile;
  35         var $mName;
  36
  37         /**
  38          * @var PDO
  39          */
  40         protected $mConn;
  41
  42         /**
  43          * Constructor.
  44          * Parameters $server, $user and $password are not used.
  45          * @param $server string
  46          * @param $user string
  47          * @param $password string
  48          * @param $dbName string
  49          * @param $flags int
  50          */
  51         function __construct( $server = false, $user = false, $password = false, $dbName = false, $flags = 0 ) {
  52                 $this->mName = $dbName;
  53                 parent::__construct( $server, $user, $password, $dbName, $flags );
  54                 // parent doesn't open when $user is false, but we can work with $dbName
  55                 if( $dbName ) {
  56                         global $wgSharedDB;
  57                         if( $this->open( $server, $user, $password, $dbName ) && $wgSharedDB ) {
  58                                 $this->attachDatabase( $wgSharedDB );
  59                         }
  60                 }
  61         }
  62
  63         /**
  64          * @return string
  65          */
  66         function getType() {
  67                 return 'sqlite';
  68         }
  69
  70         /**
  71          * @todo: check if it should be true like parent class
  72          *
  73          * @return bool
  74          */
  75         function implicitGroupby() {
  76                 return false;
  77         }
  78
  79         /** Open an SQLite database and return a resource handle to it
  80          *  NOTE: only $dbName is used, the other parameters are irrelevant for SQLite databases
  81          *
  82          * @param $server
  83          * @param $user
  84          * @param $pass
  85          * @param $dbName
  86          *
  87          * @return PDO
  88          */
  89         function open( $server, $user, $pass, $dbName ) {
  90                 global $wgSQLiteDataDir;
  91
  92                 $fileName = self::generateFileName( $wgSQLiteDataDir, $dbName );
  93                 if ( !is_readable( $fileName ) ) {
  94                         $this->mConn = false;
  95                         throw new DBConnectionError( $this, "SQLite database not accessible" );
  96                 }
  97                 $this->openFile( $fileName );
  98                 return $this->mConn;
  99         }
 100
 101         /**
 102          * Opens a database file
 103          *
 104          * @param $fileName string
 105          *
 106          * @return PDO|bool SQL connection or false if failed
 107          */
 108         function openFile( $fileName ) {
 109                 $this->mDatabaseFile = $fileName;
 110                 try {
 111                         if ( $this->mFlags & DBO_PERSISTENT ) {
 112                                 $this->mConn = new PDO( "sqlite:$fileName", '', '',
 113                                         array( PDO::ATTR_PERSISTENT => true ) );
 114                         } else {
 115                                 $this->mConn = new PDO( "sqlite:$fileName", '', '' );
 116                         }
 117                 } catch ( PDOException $e ) {
 118                         $err = $e->getMessage();
 119                 }
 120                 if ( !$this->mConn ) {
 121                         wfDebug( "DB connection error: $err\n" );
 122                         throw new DBConnectionError( $this, $err );
 123                 }
 124                 $this->mOpened = !!$this->mConn;
 125                 # set error codes only, don't raise exceptions
 126                 if ( $this->mOpened ) {
 127                         $this->mConn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT );
 128                         return true;
 129                 }
 130         }
 131
 132         /**
 133          * Does not actually close the connection, just destroys the reference for GC to do its work
 134          * @return bool
 135          */
 136         protected function closeConnection() {
 137                 $this->mConn = null;
 138                 return true;
 139         }
 140
 141         /**
 142          * Generates a database file name. Explicitly public for installer.
 143          * @param $dir String: Directory where database resides
 144          * @param $dbName String: Database name
 145          * @return String
 146          */
 147         public static function generateFileName( $dir, $dbName ) {
 148                 return "$dir/$dbName.sqlite";
 149         }
 150
 151         /**
 152          * Check if the searchindext table is FTS enabled.
 153          * @return bool False if not enabled.
 154          */
 155         function checkForEnabledSearch() {
 156                 if ( self::$fulltextEnabled === null ) {
 157                         self::$fulltextEnabled = false;
 158                         $table = $this->tableName( 'searchindex' );
 159                         $res = $this->query( "SELECT sql FROM sqlite_master WHERE tbl_name = '$table'", __METHOD__ );
 160                         if ( $res ) {
 161                                 $row = $res->fetchRow();
 162                                 self::$fulltextEnabled = stristr($row['sql'], 'fts' ) !== false;
 163                         }
 164                 }
 165                 return self::$fulltextEnabled;
 166         }
 167
 168         /**
 169          * Returns version of currently supported SQLite fulltext search module or false if none present.
 170          * @return String
 171          */
 172         static function getFulltextSearchModule() {
 173                 static $cachedResult = null;
 174                 if ( $cachedResult !== null ) {
 175                         return $cachedResult;
 176                 }
 177                 $cachedResult = false;
 178                 $table = 'dummy_search_test';
 179
 180                 $db = new DatabaseSqliteStandalone( ':memory:' );
 181
 182                 if ( $db->query( "CREATE VIRTUAL TABLE $table USING FTS3(dummy_field)", __METHOD__, true ) ) {
 183                         $cachedResult = 'FTS3';
 184                 }
 185                 $db->close();
 186                 return $cachedResult;
 187         }
 188
 189         /**
 190          * Attaches external database to our connection, see http://sqlite.org/lang_attach.html
 191          * for details.
 192          *
 193          * @param $name String: database name to be used in queries like SELECT foo FROM dbname.table
 194          * @param $file String: database file name. If omitted, will be generated using $name and $wgSQLiteDataDir
 195          * @param $fname String: calling function name
 196          *
 197          * @return ResultWrapper
 198          */
 199         function attachDatabase( $name, $file = false, $fname = 'DatabaseSqlite::attachDatabase' ) {
 200                 global $wgSQLiteDataDir;
 201                 if ( !$file ) {
 202                         $file = self::generateFileName( $wgSQLiteDataDir, $name );
 203                 }
 204                 $file = $this->addQuotes( $file );
 205                 return $this->query( "ATTACH DATABASE $file AS $name", $fname );
 206         }
 207
 208         /**
 209          * @see DatabaseBase::isWriteQuery()
 210          *
 211          * @param $sql string
 212          *
 213          * @return bool
 214          */
 215         function isWriteQuery( $sql ) {
 216                 return parent::isWriteQuery( $sql ) && !preg_match( '/^ATTACH\b/i', $sql );
 217         }
 218
 219         /**
 220          * SQLite doesn't allow buffered results or data seeking etc, so we'll use fetchAll as the result
 221          *
 222          * @param $sql string
 223          *
 224          * @return ResultWrapper
 225          */
 226         protected function doQuery( $sql ) {
 227                 $res = $this->mConn->query( $sql );
 228                 if ( $res === false ) {
 229                         return false;
 230                 } else {
 231                         $r = $res instanceof ResultWrapper ? $res->result : $res;
 232                         $this->mAffectedRows = $r->rowCount();
 233                         $res = new ResultWrapper( $this, $r->fetchAll() );
 234                 }
 235                 return $res;
 236         }
 237
 238         /**
 239          * @param $res ResultWrapper
 240          */
 241         function freeResult( $res ) {
 242                 if ( $res instanceof ResultWrapper ) {
 243                         $res->result = null;
 244                 } else {
 245                         $res = null;
 246                 }
 247         }
 248
 249         /**
 250          * @param $res ResultWrapper
 251          * @return
 252          */
 253         function fetchObject( $res ) {
 254                 if ( $res instanceof ResultWrapper ) {
 255                         $r =& $res->result;
 256                 } else {
 257                         $r =& $res;
 258                 }
 259
 260                 $cur = current( $r );
 261                 if ( is_array( $cur ) ) {
 262                         next( $r );
 263                         $obj = new stdClass;
 264                         foreach ( $cur as $k => $v ) {
 265                                 if ( !is_numeric( $k ) ) {
 266                                         $obj->$k = $v;
 267                                 }
 268                         }
 269
 270                         return $obj;
 271                 }
 272                 return false;
 273         }
 274
 275         /**
 276          * @param $res ResultWrapper
 277          * @return bool|mixed
 278          */
 279         function fetchRow( $res ) {
 280                 if ( $res instanceof ResultWrapper ) {
 281                         $r =& $res->result;
 282                 } else {
 283                         $r =& $res;
 284                 }
 285                 $cur = current( $r );
 286                 if ( is_array( $cur ) ) {
 287                         next( $r );
 288                         return $cur;
 289                 }
 290                 return false;
 291         }
 292
 293         /**
 294          * The PDO::Statement class implements the array interface so count() will work
 295          *
 296          * @param $res ResultWrapper
 297          *
 298          * @return int
 299          */
 300         function numRows( $res ) {
 301                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 302                 return count( $r );
 303         }
 304
 305         /**
 306          * @param $res ResultWrapper
 307          * @return int
 308          */
 309         function numFields( $res ) {
 310                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 311                 return is_array( $r ) ? count( $r[0] ) : 0;
 312         }
 313
 314         /**
 315          * @param $res ResultWrapper
 316          * @param $n
 317          * @return bool
 318          */
 319         function fieldName( $res, $n ) {
 320                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 321                 if ( is_array( $r ) ) {
 322                         $keys = array_keys( $r[0] );
 323                         return $keys[$n];
 324                 }
 325                 return false;
 326         }
 327
 328         /**
 329          * Use MySQL's naming (accounts for prefix etc) but remove surrounding backticks
 330          *
 331          * @param $name
 332          * @param $format String
 333          * @return string
 334          */
 335         function tableName( $name, $format = 'quoted' ) {
 336                 // table names starting with sqlite_ are reserved
 337                 if ( strpos( $name, 'sqlite_' ) === 0 ) {
 338                         return $name;
 339                 }
 340                 return str_replace( '"', '', parent::tableName( $name, $format ) );
 341         }
 342
 343         /**
 344          * Index names have DB scope
 345          *
 346          * @param $index string
 347          *
 348          * @return string
 349          */
 350         function indexName( $index ) {
 351                 return $index;
 352         }
 353
 354         /**
 355          * This must be called after nextSequenceVal
 356          *
 357          * @return int
 358          */
 359         function insertId() {
 360                 // PDO::lastInsertId yields a string :(
 361                 return intval( $this->mConn->lastInsertId() );
 362         }
 363
 364         /**
 365          * @param $res ResultWrapper
 366          * @param $row
 367          */
 368         function dataSeek( $res, $row ) {
 369                 if ( $res instanceof ResultWrapper ) {
 370                         $r =& $res->result;
 371                 } else {
 372                         $r =& $res;
 373                 }
 374                 reset( $r );
 375                 if ( $row > 0 ) {
 376                         for ( $i = 0; $i < $row; $i++ ) {
 377                                 next( $r );
 378                         }
 379                 }
 380         }
 381
 382         /**
 383          * @return string
 384          */
 385         function lastError() {
 386                 if ( !is_object( $this->mConn ) ) {
 387                         return "Cannot return last error, no db connection";
 388                 }
 389                 $e = $this->mConn->errorInfo();
 390                 return isset( $e[2] ) ? $e[2] : '';
 391         }
 392
 393         /**
 394          * @return string
 395          */
 396         function lastErrno() {
 397                 if ( !is_object( $this->mConn ) ) {
 398                         return "Cannot return last error, no db connection";
 399                 } else {
 400                         $info = $this->mConn->errorInfo();
 401                         return $info[1];
 402                 }
 403         }
 404
 405         /**
 406          * @return int
 407          */
 408         function affectedRows() {
 409                 return $this->mAffectedRows;
 410         }
 411
 412         /**
 413          * Returns information about an index
 414          * Returns false if the index does not exist
 415          * - if errors are explicitly ignored, returns NULL on failure
 416          *
 417          * @return array
 418          */
 419         function indexInfo( $table, $index, $fname = 'DatabaseSqlite::indexExists' ) {
 420                 $sql = 'PRAGMA index_info(' . $this->addQuotes( $this->indexName( $index ) ) . ')';
 421                 $res = $this->query( $sql, $fname );
 422                 if ( !$res ) {
 423                         return null;
 424                 }
 425                 if ( $res->numRows() == 0 ) {
 426                         return false;
 427                 }
 428                 $info = array();
 429                 foreach ( $res as $row ) {
 430                         $info[] = $row->name;
 431                 }
 432                 return $info;
 433         }
 434
 435         /**
 436          * @param $table
 437          * @param $index
 438          * @param $fname string
 439          * @return bool|null
 440          */
 441         function indexUnique( $table, $index, $fname = 'DatabaseSqlite::indexUnique' ) {
 442                 $row = $this->selectRow( 'sqlite_master', '*',
 443                         array(
 444                                 'type' => 'index',
 445                                 'name' => $this->indexName( $index ),
 446                         ), $fname );
 447                 if ( !$row || !isset( $row->sql ) ) {
 448                         return null;
 449                 }
 450
 451                 // $row->sql will be of the form CREATE [UNIQUE] INDEX ...
 452                 $indexPos = strpos( $row->sql, 'INDEX' );
 453                 if ( $indexPos === false ) {
 454                         return null;
 455                 }
 456                 $firstPart = substr( $row->sql, 0, $indexPos );
 457                 $options = explode( ' ', $firstPart );
 458                 return in_array( 'UNIQUE', $options );
 459         }
 460
 461         /**
 462          * Filter the options used in SELECT statements
 463          *
 464          * @param $options array
 465          *
 466          * @return array
 467          */
 468         function makeSelectOptions( $options ) {
 469                 foreach ( $options as $k => $v ) {
 470                         if ( is_numeric( $k ) && $v == 'FOR UPDATE' ) {
 471                                 $options[$k] = '';
 472                         }
 473                 }
 474                 return parent::makeSelectOptions( $options );
 475         }
 476
 477         /**
 478          * @param $options array
 479          * @return string
 480          */
 481         function makeUpdateOptions( $options ) {
 482                 $options = self::fixIgnore( $options );
 483                 return parent::makeUpdateOptions( $options );
 484         }
 485
 486         /**
 487          * @param $options array
 488          * @return array
 489          */
 490         static function fixIgnore( $options ) {
 491                 # SQLite uses OR IGNORE not just IGNORE
 492                 foreach ( $options as $k => $v ) {
 493                         if ( $v == 'IGNORE' ) {
 494                                 $options[$k] = 'OR IGNORE';
 495                         }
 496                 }
 497                 return $options;
 498         }
 499
 500         /**
 501          * @param $options array
 502          * @return string
 503          */
 504         function makeInsertOptions( $options ) {
 505                 $options = self::fixIgnore( $options );
 506                 return parent::makeInsertOptions( $options );
 507         }
 508
 509         /**
 510          * Based on generic method (parent) with some prior SQLite-sepcific adjustments
 511          * @return bool
 512          */
 513         function insert( $table, $a, $fname = 'DatabaseSqlite::insert', $options = array() ) {
 514                 if ( !count( $a ) ) {
 515                         return true;
 516                 }
 517
 518                 # SQLite can't handle multi-row inserts, so divide up into multiple single-row inserts
 519                 if ( isset( $a[0] ) && is_array( $a[0] ) ) {
 520                         $ret = true;
 521                         foreach ( $a as $v ) {
 522                                 if ( !parent::insert( $table, $v, "$fname/multi-row", $options ) ) {
 523                                         $ret = false;
 524                                 }
 525                         }
 526                 } else {
 527                         $ret = parent::insert( $table, $a, "$fname/single-row", $options );
 528                 }
 529
 530                 return $ret;
 531         }
 532
 533         /**
 534          * @param $table
 535          * @param $uniqueIndexes
 536          * @param $rows
 537          * @param $fname string
 538          * @return bool|ResultWrapper
 539          */
 540         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseSqlite::replace' ) {
 541                 if ( !count( $rows ) ) return true;
 542
 543                 # SQLite can't handle multi-row replaces, so divide up into multiple single-row queries
 544                 if ( isset( $rows[0] ) && is_array( $rows[0] ) ) {
 545                         $ret = true;
 546                         foreach ( $rows as $v ) {
 547                                 if ( !$this->nativeReplace( $table, $v, "$fname/multi-row" ) ) {
 548                                         $ret = false;
 549                                 }
 550                         }
 551                 } else {
 552                         $ret = $this->nativeReplace( $table, $rows, "$fname/single-row" );
 553                 }
 554
 555                 return $ret;
 556         }
 557
 558         /**
 559          * Returns the size of a text field, or -1 for "unlimited"
 560          * In SQLite this is SQLITE_MAX_LENGTH, by default 1GB. No way to query it though.
 561          *
 562          * @return int
 563          */
 564         function textFieldSize( $table, $field ) {
 565                 return -1;
 566         }
 567
 568         /**
 569          * @return bool
 570          */
 571         function unionSupportsOrderAndLimit() {
 572                 return false;
 573         }
 574
 575         /**
 576          * @param $sqls
 577          * @param $all
 578          * @return string
 579          */
 580         function unionQueries( $sqls, $all ) {
 581                 $glue = $all ? ' UNION ALL ' : ' UNION ';
 582                 return implode( $glue, $sqls );
 583         }
 584
 585         /**
 586          * @return bool
 587          */
 588         function wasDeadlock() {
 589                 return $this->lastErrno() == 5; // SQLITE_BUSY
 590         }
 591
 592         /**
 593          * @return bool
 594          */
 595         function wasErrorReissuable() {
 596                 return $this->lastErrno() ==  17; // SQLITE_SCHEMA;
 597         }
 598
 599         /**
 600          * @return bool
 601          */
 602         function wasReadOnlyError() {
 603                 return $this->lastErrno() == 8; // SQLITE_READONLY;
 604         }
 605
 606         /**
 607          * @return string wikitext of a link to the server software's web site
 608          */
 609         public static function getSoftwareLink() {
 610                 return "[http://sqlite.org/ SQLite]";
 611         }
 612
 613         /**
 614          * @return string Version information from the database
 615          */
 616         function getServerVersion() {
 617                 $ver = $this->mConn->getAttribute( PDO::ATTR_SERVER_VERSION );
 618                 return $ver;
 619         }
 620
 621         /**
 622          * @return string User-friendly database information
 623          */
 624         public function getServerInfo() {
 625                 return wfMessage( self::getFulltextSearchModule() ? 'sqlite-has-fts' : 'sqlite-no-fts', $this->getServerVersion() )->text();
 626         }
 627
 628         /**
 629          * Get information about a given field
 630          * Returns false if the field does not exist.
 631          *
 632          * @param $table string
 633          * @param $field string
 634          * @return SQLiteField|bool False on failure
 635          */
 636         function fieldInfo( $table, $field ) {
 637                 $tableName = $this->tableName( $table );
 638                 $sql = 'PRAGMA table_info(' . $this->addQuotes( $tableName ) . ')';
 639                 $res = $this->query( $sql, __METHOD__ );
 640                 foreach ( $res as $row ) {
 641                         if ( $row->name == $field ) {
 642                                 return new SQLiteField( $row, $tableName );
 643                         }
 644                 }
 645                 return false;
 646         }
 647
 648         protected function doBegin( $fname = '' ) {
 649                 if ( $this->mTrxLevel == 1 ) {
 650                         $this->commit( __METHOD__ );
 651                 }
 652                 $this->mConn->beginTransaction();
 653                 $this->mTrxLevel = 1;
 654         }
 655
 656         protected function doCommit( $fname = '' ) {
 657                 if ( $this->mTrxLevel == 0 ) {
 658                         return;
 659                 }
 660                 $this->mConn->commit();
 661                 $this->mTrxLevel = 0;
 662         }
 663
 664         protected function doRollback( $fname = '' ) {
 665                 if ( $this->mTrxLevel == 0 ) {
 666                         return;
 667                 }
 668                 $this->mConn->rollBack();
 669                 $this->mTrxLevel = 0;
 670         }
 671
 672         /**
 673          * @param $s string
 674          * @return string
 675          */
 676         function strencode( $s ) {
 677                 return substr( $this->addQuotes( $s ), 1, - 1 );
 678         }
 679
 680         /**
 681          * @param $b
 682          * @return Blob
 683          */
 684         function encodeBlob( $b ) {
 685                 return new Blob( $b );
 686         }
 687
 688         /**
 689          * @param $b Blob|string
 690          * @return string
 691          */
 692         function decodeBlob( $b ) {
 693                 if ( $b instanceof Blob ) {
 694                         $b = $b->fetch();
 695                 }
 696                 return $b;
 697         }
 698
 699         /**
 700          * @param $s Blob|string
 701          * @return string
 702          */
 703         function addQuotes( $s ) {
 704                 if ( $s instanceof Blob ) {
 705                         return "x'" . bin2hex( $s->fetch() ) . "'";
 706                 } else {
 707                         return $this->mConn->quote( $s );
 708                 }
 709         }
 710
 711         /**
 712          * @return string
 713          */
 714         function buildLike() {
 715                 $params = func_get_args();
 716                 if ( count( $params ) > 0 && is_array( $params[0] ) ) {
 717                         $params = $params[0];
 718                 }
 719                 return parent::buildLike( $params ) . "ESCAPE '\' ";
 720         }
 721
 722         /**
 723          * @return string
 724          */
 725         public function getSearchEngine() {
 726                 return "SearchSqlite";
 727         }
 728
 729         /**
 730          * No-op version of deadlockLoop
 731          * @return mixed
 732          */
 733         public function deadlockLoop( /*...*/ ) {
 734                 $args = func_get_args();
 735                 $function = array_shift( $args );
 736                 return call_user_func_array( $function, $args );
 737         }
 738
 739         /**
 740          * @param $s string
 741          * @return string
 742          */
 743         protected function replaceVars( $s ) {
 744                 $s = parent::replaceVars( $s );
 745                 if ( preg_match( '/^\s*(CREATE|ALTER) TABLE/i', $s ) ) {
 746                         // CREATE TABLE hacks to allow schema file sharing with MySQL
 747
 748                         // binary/varbinary column type -> blob
 749                         $s = preg_replace( '/\b(var)?binary(\(\d+\))/i', 'BLOB', $s );
 750                         // no such thing as unsigned
 751                         $s = preg_replace( '/\b(un)?signed\b/i', '', $s );
 752                         // INT -> INTEGER
 753                         $s = preg_replace( '/\b(tiny|small|medium|big|)int(\s*\(\s*\d+\s*\)|\b)/i', 'INTEGER', $s );
 754                         // floating point types -> REAL
 755                         $s = preg_replace( '/\b(float|double(\s+precision)?)(\s*\(\s*\d+\s*(,\s*\d+\s*)?\)|\b)/i', 'REAL', $s );
 756                         // varchar -> TEXT
 757                         $s = preg_replace( '/\b(var)?char\s*\(.*?\)/i', 'TEXT', $s );
 758                         // TEXT normalization
 759                         $s = preg_replace( '/\b(tiny|medium|long)text\b/i', 'TEXT', $s );
 760                         // BLOB normalization
 761                         $s = preg_replace( '/\b(tiny|small|medium|long|)blob\b/i', 'BLOB', $s );
 762                         // BOOL -> INTEGER
 763                         $s = preg_replace( '/\bbool(ean)?\b/i', 'INTEGER', $s );
 764                         // DATETIME -> TEXT
 765                         $s = preg_replace( '/\b(datetime|timestamp)\b/i', 'TEXT', $s );
 766                         // No ENUM type
 767                         $s = preg_replace( '/\benum\s*\([^)]*\)/i', 'TEXT', $s );
 768                         // binary collation type -> nothing
 769                         $s = preg_replace( '/\bbinary\b/i', '', $s );
 770                         // auto_increment -> autoincrement
 771                         $s = preg_replace( '/\bauto_increment\b/i', 'AUTOINCREMENT', $s );
 772                         // No explicit options
 773                         $s = preg_replace( '/\)[^);]*(;?)\s*$/', ')\1', $s );
 774                         // AUTOINCREMENT should immedidately follow PRIMARY KEY
 775                         $s = preg_replace( '/primary key (.*?) autoincrement/i', 'PRIMARY KEY AUTOINCREMENT $1', $s );
 776                 } elseif ( preg_match( '/^\s*CREATE (\s*(?:UNIQUE|FULLTEXT)\s+)?INDEX/i', $s ) ) {
 777                         // No truncated indexes
 778                         $s = preg_replace( '/\(\d+\)/', '', $s );
 779                         // No FULLTEXT
 780                         $s = preg_replace( '/\bfulltext\b/i', '', $s );
 781                 }
 782                 return $s;
 783         }
 784
 785         /**
 786          * Build a concatenation list to feed into a SQL query
 787          *
 788          * @param $stringList array
 789          *
 790          * @return string
 791          */
 792         function buildConcat( $stringList ) {
 793                 return '(' . implode( ') || (', $stringList ) . ')';
 794         }
 795
 796         /**
 797          * @throws MWException
 798          * @param $oldName
 799          * @param $newName
 800          * @param $temporary bool
 801          * @param $fname string
 802          * @return bool|ResultWrapper
 803          */
 804         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseSqlite::duplicateTableStructure' ) {
 805                 $res = $this->query( "SELECT sql FROM sqlite_master WHERE tbl_name=" . $this->addQuotes( $oldName ) . " AND type='table'", $fname );
 806                 $obj = $this->fetchObject( $res );
 807                 if ( !$obj ) {
 808                         throw new MWException( "Couldn't retrieve structure for table $oldName" );
 809                 }
 810                 $sql = $obj->sql;
 811                 $sql = preg_replace( '/(?<=\W)"?' . preg_quote( trim( $this->addIdentifierQuotes( $oldName ), '"' ) ) . '"?(?=\W)/', $this->addIdentifierQuotes( $newName ), $sql, 1 );
 812                 if ( $temporary ) {
 813                         if ( preg_match( '/^\\s*CREATE\\s+VIRTUAL\\s+TABLE\b/i', $sql ) ) {
 814                                 wfDebug( "Table $oldName is virtual, can't create a temporary duplicate.\n" );
 815                         } else {
 816                                 $sql = str_replace( 'CREATE TABLE', 'CREATE TEMPORARY TABLE', $sql );
 817                         }
 818                 }
 819                 return $this->query( $sql, $fname );
 820         }
 821
 822
 823         /**
 824          * List all tables on the database
 825          *
 826          * @param $prefix string Only show tables with this prefix, e.g. mw_
 827          * @param $fname String: calling function name
 828          *
 829          * @return array
 830          */
 831         function listTables( $prefix = null, $fname = 'DatabaseSqlite::listTables' ) {
 832                 $result = $this->select(
 833                         'sqlite_master',
 834                         'name',
 835                         "type='table'"
 836                 );
 837
 838                 $endArray = array();
 839
 840                 foreach( $result as $table ) {
 841                         $vars = get_object_vars($table);
 842                         $table = array_pop( $vars );
 843
 844                         if( !$prefix || strpos( $table, $prefix ) === 0 ) {
 845                                 if ( strpos( $table, 'sqlite_' ) !== 0 ) {
 846                                         $endArray[] = $table;
 847                                 }
 848
 849                         }
 850                 }
 851
 852                 return $endArray;
 853         }
 854
 855 } // end DatabaseSqlite class
 856
 857 /**
 858  * This class allows simple acccess to a SQLite database independently from main database settings
 859  * @ingroup Database
 860  */
 861 class DatabaseSqliteStandalone extends DatabaseSqlite {
 862         public function __construct( $fileName, $flags = 0 ) {
 863                 $this->mFlags = $flags;
 864                 $this->tablePrefix( null );
 865                 $this->openFile( $fileName );
 866         }
 867 }
 868
 869 /**
 870  * @ingroup Database
 871  */
 872 class SQLiteField implements Field {
 873         private $info, $tableName;
 874         function __construct( $info, $tableName ) {
 875                 $this->info = $info;
 876                 $this->tableName = $tableName;
 877         }
 878
 879         function name() {
 880                 return $this->info->name;
 881         }
 882
 883         function tableName() {
 884                 return $this->tableName;
 885         }
 886
 887         function defaultValue() {
 888                 if ( is_string( $this->info->dflt_value ) ) {
 889                         // Typically quoted
 890                         if ( preg_match( '/^\'(.*)\'$', $this->info->dflt_value ) ) {
 891                                 return str_replace( "''", "'", $this->info->dflt_value );
 892                         }
 893                 }
 894                 return $this->info->dflt_value;
 895         }
 896
 897         /**
 898          * @return bool
 899          */
 900         function isNullable() {
 901                 return !$this->info->notnull;
 902         }
 903
 904         function type() {
 905                 return $this->info->type;
 906         }
 907
 908 } // end SQLiteField