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  * @file
   7  * @ingroup Database
   8  */
   9
  10 /**
  11  * @ingroup Database
  12  */
  13 class DatabaseSqlite extends DatabaseBase {
  14
  15         private static $fulltextEnabled = null;
  16
  17         var $mAffectedRows;
  18         var $mLastResult;
  19         var $mDatabaseFile;
  20         var $mName;
  21
  22         /**
  23          * Constructor.
  24          * Parameters $server, $user and $password are not used.
  25          */
  26         function __construct( $server = false, $user = false, $password = false, $dbName = false, $failFunction = false, $flags = 0 ) {
  27                 global $wgSharedDB;
  28                 $this->mFailFunction = $failFunction;
  29                 $this->mFlags = $flags;
  30                 $this->mName = $dbName;
  31
  32                 if ( $this->open( $server, $user, $password, $dbName ) && $wgSharedDB ) {
  33                         $this->attachDatabase( $wgSharedDB );
  34                 }
  35         }
  36
  37         /**
  38          * Serialization handler, see http://php.net/manual/en/language.oop5.magic.php#language.oop5.magic.sleep
  39          * for details. Instances of this class sometimes get serialized, e.g. with Title and its BacklinkCache
  40          * Because attempts to serialize mConn end in "can't serialize PDO objects" exceptions, we simply disallow
  41          * to serialize anything in this class.
  42          */
  43         function __sleep() {
  44                 return array();
  45         }
  46
  47         function getType() {
  48                 return 'sqlite';
  49         }
  50
  51         /**
  52          * @todo: check if it should be true like parent class
  53          */
  54         function implicitGroupby()   { return false; }
  55
  56         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0 ) {
  57                 return new DatabaseSqlite( $server, $user, $password, $dbName, $failFunction, $flags );
  58         }
  59
  60         /** Open an SQLite database and return a resource handle to it
  61          *  NOTE: only $dbName is used, the other parameters are irrelevant for SQLite databases
  62          */
  63         function open( $server, $user, $pass, $dbName ) {
  64                 global $wgSQLiteDataDir;
  65
  66                 $fileName = self::generateFileName( $wgSQLiteDataDir, $dbName );
  67                 if ( !is_readable( $fileName ) ) {
  68                         $this->mConn = false;
  69                         throw new DBConnectionError( $this, "SQLite database not accessible" );
  70                 }
  71                 $this->openFile( $fileName );
  72                 return $this->mConn;
  73         }
  74
  75         /**
  76          * Opens a database file
  77          * @return SQL connection or false if failed
  78          */
  79         function openFile( $fileName ) {
  80                 $this->mDatabaseFile = $fileName;
  81                 try {
  82                         if ( $this->mFlags & DBO_PERSISTENT ) {
  83                                 $this->mConn = new PDO( "sqlite:$fileName", '', '',
  84                                         array( PDO::ATTR_PERSISTENT => true ) );
  85                         } else {
  86                                 $this->mConn = new PDO( "sqlite:$fileName", '', '' );
  87                         }
  88                 } catch ( PDOException $e ) {
  89                         $err = $e->getMessage();
  90                 }
  91                 if ( $this->mConn === false ) {
  92                         wfDebug( "DB connection error: $err\n" );
  93                         if ( !$this->mFailFunction ) {
  94                                 throw new DBConnectionError( $this, $err );
  95                         } else {
  96                                 return false;
  97                         }
  98
  99                 }
 100                 $this->mOpened = !!$this->mConn;
 101                 # set error codes only, don't raise exceptions
 102                 if ( $this->mOpened ) {
 103                         $this->mConn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT );
 104                         return true;
 105                 }
 106         }
 107
 108         /**
 109          * Close an SQLite database
 110          */
 111         function close() {
 112                 $this->mOpened = false;
 113                 if ( is_object( $this->mConn ) ) {
 114                         if ( $this->trxLevel() ) $this->commit();
 115                         $this->mConn = null;
 116                 }
 117                 return true;
 118         }
 119
 120         /**
 121          * Generates a database file name. Explicitly public for installer.
 122          * @param $dir String: Directory where database resides
 123          * @param $dbName String: Database name
 124          * @return String
 125          */
 126         public static function generateFileName( $dir, $dbName ) {
 127                 return "$dir/$dbName.sqlite";
 128         }
 129
 130         /**
 131          * Check if the searchindext table is FTS enabled.
 132          * @returns false if not enabled.
 133          */
 134         function checkForEnabledSearch() {
 135                 if ( self::$fulltextEnabled === null ) {
 136                         self::$fulltextEnabled = false;
 137                         $res = $this->query( "SELECT sql FROM sqlite_master WHERE tbl_name = 'searchindex'", __METHOD__ );
 138                         if ( $res ) {
 139                                 $row = $res->fetchRow();
 140                                 self::$fulltextEnabled = stristr($row['sql'], 'fts' ) !== false;
 141                         }
 142                 }
 143                 return self::$fulltextEnabled;
 144         }
 145
 146         /**
 147          * Returns version of currently supported SQLite fulltext search module or false if none present.
 148          * @return String
 149          */
 150         function getFulltextSearchModule() {
 151                 static $cachedResult = null;
 152                 if ( $cachedResult !== null ) {
 153                         return $cachedResult;
 154                 }
 155                 $cachedResult = false;
 156                 $table = 'dummy_search_test';
 157                 $this->query( "DROP TABLE IF EXISTS $table", __METHOD__ );
 158
 159                 if ( $this->query( "CREATE VIRTUAL TABLE $table USING FTS3(dummy_field)", __METHOD__, true ) ) {
 160                         $this->query( "DROP TABLE IF EXISTS $table", __METHOD__ );
 161                         $cachedResult = 'FTS3';
 162                 }
 163                 return $cachedResult;
 164         }
 165
 166         /**
 167          * Attaches external database to our connection, see http://sqlite.org/lang_attach.html
 168          * for details.
 169          * @param $name String: database name to be used in queries like SELECT foo FROM dbname.table
 170          * @param $file String: database file name. If omitted, will be generated using $name and $wgSQLiteDataDir
 171          * @param $fname String: calling function name
 172          */
 173         function attachDatabase( $name, $file = false, $fname = 'DatabaseSqlite::attachDatabase' ) {
 174                 global $wgSQLiteDataDir;
 175                 if ( !$file ) {
 176                         $file = self::generateFileName( $wgSQLiteDataDir, $name );
 177                 }
 178                 $file = $this->addQuotes( $file );
 179                 return $this->query( "ATTACH DATABASE $file AS $name", $fname );
 180         }
 181
 182         /**
 183          * @see DatabaseBase::isWriteQuery()
 184          */
 185         function isWriteQuery( $sql ) {
 186                 return parent::isWriteQuery( $sql ) && !preg_match( '/^ATTACH\b/i', $sql );
 187         }
 188
 189         /**
 190          * SQLite doesn't allow buffered results or data seeking etc, so we'll use fetchAll as the result
 191          */
 192         function doQuery( $sql ) {
 193                 $res = $this->mConn->query( $sql );
 194                 if ( $res === false ) {
 195                         return false;
 196                 } else {
 197                         $r = $res instanceof ResultWrapper ? $res->result : $res;
 198                         $this->mAffectedRows = $r->rowCount();
 199                         $res = new ResultWrapper( $this, $r->fetchAll() );
 200                 }
 201                 return $res;
 202         }
 203
 204         function freeResult( $res ) {
 205                 if ( $res instanceof ResultWrapper ) {
 206                         $res->result = null;
 207                 } else {
 208                         $res = null;
 209                 }
 210         }
 211
 212         function fetchObject( $res ) {
 213                 if ( $res instanceof ResultWrapper ) {
 214                         $r =& $res->result;
 215                 } else {
 216                         $r =& $res;
 217                 }
 218
 219                 $cur = current( $r );
 220                 if ( is_array( $cur ) ) {
 221                         next( $r );
 222                         $obj = new stdClass;
 223                         foreach ( $cur as $k => $v ) {
 224                                 if ( !is_numeric( $k ) ) {
 225                                         $obj->$k = $v;
 226                                 }
 227                         }
 228
 229                         return $obj;
 230                 }
 231                 return false;
 232         }
 233
 234         function fetchRow( $res ) {
 235                 if ( $res instanceof ResultWrapper ) {
 236                         $r =& $res->result;
 237                 } else {
 238                         $r =& $res;
 239                 }
 240                 $cur = current( $r );
 241                 if ( is_array( $cur ) ) {
 242                         next( $r );
 243                         return $cur;
 244                 }
 245                 return false;
 246         }
 247
 248         /**
 249          * The PDO::Statement class implements the array interface so count() will work
 250          */
 251         function numRows( $res ) {
 252                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 253                 return count( $r );
 254         }
 255
 256         function numFields( $res ) {
 257                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 258                 return is_array( $r ) ? count( $r[0] ) : 0;
 259         }
 260
 261         function fieldName( $res, $n ) {
 262                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 263                 if ( is_array( $r ) ) {
 264                         $keys = array_keys( $r[0] );
 265                         return $keys[$n];
 266                 }
 267                 return  false;
 268         }
 269
 270         /**
 271          * Use MySQL's naming (accounts for prefix etc) but remove surrounding backticks
 272          */
 273         function tableName( $name ) {
 274                 // table names starting with sqlite_ are reserved
 275                 if ( strpos( $name, 'sqlite_' ) === 0 ) return $name;
 276                 return str_replace( '`', '', parent::tableName( $name ) );
 277         }
 278
 279         /**
 280          * Index names have DB scope
 281          */
 282         function indexName( $index ) {
 283                 return $index;
 284         }
 285
 286         /**
 287          * This must be called after nextSequenceVal
 288          */
 289         function insertId() {
 290                 return $this->mConn->lastInsertId();
 291         }
 292
 293         function dataSeek( $res, $row ) {
 294                 if ( $res instanceof ResultWrapper ) {
 295                         $r =& $res->result;
 296                 } else {
 297                         $r =& $res;
 298                 }
 299                 reset( $r );
 300                 if ( $row > 0 ) {
 301                         for ( $i = 0; $i < $row; $i++ ) {
 302                                 next( $r );
 303                         }
 304                 }
 305         }
 306
 307         function lastError() {
 308                 if ( !is_object( $this->mConn ) ) {
 309                         return "Cannot return last error, no db connection";
 310                 }
 311                 $e = $this->mConn->errorInfo();
 312                 return isset( $e[2] ) ? $e[2] : '';
 313         }
 314
 315         function lastErrno() {
 316                 if ( !is_object( $this->mConn ) ) {
 317                         return "Cannot return last error, no db connection";
 318                 } else {
 319                         $info = $this->mConn->errorInfo();
 320                         return $info[1];
 321                 }
 322         }
 323
 324         function affectedRows() {
 325                 return $this->mAffectedRows;
 326         }
 327
 328         /**
 329          * Returns information about an index
 330          * Returns false if the index does not exist
 331          * - if errors are explicitly ignored, returns NULL on failure
 332          */
 333         function indexInfo( $table, $index, $fname = 'DatabaseSqlite::indexExists' ) {
 334                 $sql = 'PRAGMA index_info(' . $this->addQuotes( $this->indexName( $index ) ) . ')';
 335                 $res = $this->query( $sql, $fname );
 336                 if ( !$res ) {
 337                         return null;
 338                 }
 339                 if ( $res->numRows() == 0 ) {
 340                         return false;
 341                 }
 342                 $info = array();
 343                 foreach ( $res as $row ) {
 344                         $info[] = $row->name;
 345                 }
 346                 return $info;
 347         }
 348
 349         function indexUnique( $table, $index, $fname = 'DatabaseSqlite::indexUnique' ) {
 350                 $row = $this->selectRow( 'sqlite_master', '*',
 351                         array(
 352                                 'type' => 'index',
 353                                 'name' => $this->indexName( $index ),
 354                         ), $fname );
 355                 if ( !$row || !isset( $row->sql ) ) {
 356                         return null;
 357                 }
 358
 359                 // $row->sql will be of the form CREATE [UNIQUE] INDEX ...
 360                 $indexPos = strpos( $row->sql, 'INDEX' );
 361                 if ( $indexPos === false ) {
 362                         return null;
 363                 }
 364                 $firstPart = substr( $row->sql, 0, $indexPos );
 365                 $options = explode( ' ', $firstPart );
 366                 return in_array( 'UNIQUE', $options );
 367         }
 368
 369         /**
 370          * Filter the options used in SELECT statements
 371          */
 372         function makeSelectOptions( $options ) {
 373                 foreach ( $options as $k => $v ) {
 374                         if ( is_numeric( $k ) && $v == 'FOR UPDATE' ) {
 375                                 $options[$k] = '';
 376                         }
 377                 }
 378                 return parent::makeSelectOptions( $options );
 379         }
 380
 381         /**
 382          * Based on generic method (parent) with some prior SQLite-sepcific adjustments
 383          */
 384         function insert( $table, $a, $fname = 'DatabaseSqlite::insert', $options = array() ) {
 385                 if ( !count( $a ) ) {
 386                         return true;
 387                 }
 388                 if ( !is_array( $options ) ) {
 389                         $options = array( $options );
 390                 }
 391
 392                 # SQLite uses OR IGNORE not just IGNORE
 393                 foreach ( $options as $k => $v ) {
 394                         if ( $v == 'IGNORE' ) {
 395                                 $options[$k] = 'OR IGNORE';
 396                         }
 397                 }
 398
 399                 # SQLite can't handle multi-row inserts, so divide up into multiple single-row inserts
 400                 if ( isset( $a[0] ) && is_array( $a[0] ) ) {
 401                         $ret = true;
 402                         foreach ( $a as $k => $v ) {
 403                                 if ( !parent::insert( $table, $v, "$fname/multi-row", $options ) ) {
 404                                         $ret = false;
 405                                 }
 406                         }
 407                 } else {
 408                         $ret = parent::insert( $table, $a, "$fname/single-row", $options );
 409                 }
 410
 411                 return $ret;
 412         }
 413
 414         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseSqlite::replace' ) {
 415                 if ( !count( $rows ) ) return true;
 416
 417                 # SQLite can't handle multi-row replaces, so divide up into multiple single-row queries
 418                 if ( isset( $rows[0] ) && is_array( $rows[0] ) ) {
 419                         $ret = true;
 420                         foreach ( $rows as $k => $v ) {
 421                                 if ( !parent::replace( $table, $uniqueIndexes, $v, "$fname/multi-row" ) ) {
 422                                         $ret = false;
 423                                 }
 424                         }
 425                 } else {
 426                         $ret = parent::replace( $table, $uniqueIndexes, $rows, "$fname/single-row" );
 427                 }
 428
 429                 return $ret;
 430         }
 431
 432         /**
 433          * Returns the size of a text field, or -1 for "unlimited"
 434          * In SQLite this is SQLITE_MAX_LENGTH, by default 1GB. No way to query it though.
 435          */
 436         function textFieldSize( $table, $field ) {
 437                 return - 1;
 438         }
 439
 440         function unionSupportsOrderAndLimit() {
 441                 return false;
 442         }
 443
 444         function unionQueries( $sqls, $all ) {
 445                 $glue = $all ? ' UNION ALL ' : ' UNION ';
 446                 return implode( $glue, $sqls );
 447         }
 448
 449         function wasDeadlock() {
 450                 return $this->lastErrno() == 5; // SQLITE_BUSY
 451         }
 452
 453         function wasErrorReissuable() {
 454                 return $this->lastErrno() ==  17; // SQLITE_SCHEMA;
 455         }
 456
 457         function wasReadOnlyError() {
 458                 return $this->lastErrno() == 8; // SQLITE_READONLY;
 459         }
 460
 461         /**
 462          * @return string wikitext of a link to the server software's web site
 463          */
 464         public static function getSoftwareLink() {
 465                 return "[http://sqlite.org/ SQLite]";
 466         }
 467
 468         /**
 469          * @return string Version information from the database
 470          */
 471         function getServerVersion() {
 472                 $ver = $this->mConn->getAttribute( PDO::ATTR_SERVER_VERSION );
 473                 return $ver;
 474         }
 475
 476         /**
 477          * @return string User-friendly database information
 478          */
 479         public function getServerInfo() {
 480                 return wfMsg( $this->getFulltextSearchModule() ? 'sqlite-has-fts' : 'sqlite-no-fts', $this->getServerVersion() );
 481         }
 482
 483         /**
 484          * Get information about a given field
 485          * Returns false if the field does not exist.
 486          */
 487         function fieldInfo( $table, $field ) {
 488                 $tableName = $this->tableName( $table );
 489                 $sql = 'PRAGMA table_info(' . $this->addQuotes( $tableName ) . ')';
 490                 $res = $this->query( $sql, __METHOD__ );
 491                 foreach ( $res as $row ) {
 492                         if ( $row->name == $field ) {
 493                                 return new SQLiteField( $row, $tableName );
 494                         }
 495                 }
 496                 return false;
 497         }
 498
 499         function begin( $fname = '' ) {
 500                 if ( $this->mTrxLevel == 1 ) $this->commit();
 501                 $this->mConn->beginTransaction();
 502                 $this->mTrxLevel = 1;
 503         }
 504
 505         function commit( $fname = '' ) {
 506                 if ( $this->mTrxLevel == 0 ) return;
 507                 $this->mConn->commit();
 508                 $this->mTrxLevel = 0;
 509         }
 510
 511         function rollback( $fname = '' ) {
 512                 if ( $this->mTrxLevel == 0 ) return;
 513                 $this->mConn->rollBack();
 514                 $this->mTrxLevel = 0;
 515         }
 516
 517         function limitResultForUpdate( $sql, $num ) {
 518                 return $this->limitResult( $sql, $num );
 519         }
 520
 521         function strencode( $s ) {
 522                 return substr( $this->addQuotes( $s ), 1, - 1 );
 523         }
 524
 525         function encodeBlob( $b ) {
 526                 return new Blob( $b );
 527         }
 528
 529         function decodeBlob( $b ) {
 530                 if ( $b instanceof Blob ) {
 531                         $b = $b->fetch();
 532                 }
 533                 return $b;
 534         }
 535
 536         function addQuotes( $s ) {
 537                 if ( $s instanceof Blob ) {
 538                         return "x'" . bin2hex( $s->fetch() ) . "'";
 539                 } else {
 540                         return $this->mConn->quote( $s );
 541                 }
 542         }
 543
 544         function quote_ident( $s ) {
 545                 return $s;
 546         }
 547
 548         function buildLike() {
 549                 $params = func_get_args();
 550                 if ( count( $params ) > 0 && is_array( $params[0] ) ) {
 551                         $params = $params[0];
 552                 }
 553                 return parent::buildLike( $params ) . "ESCAPE '\' ";
 554         }
 555
 556         /**
 557          * Called by the installer script
 558          * - this is the same way PostgreSQL works, MySQL reads in tables.sql and interwiki.sql using DatabaseBase::sourceFile()
 559          */
 560         public function setup_database() {
 561                 global $IP;
 562
 563                 # Process common MySQL/SQLite table definitions
 564                 $err = $this->sourceFile( "$IP/maintenance/tables.sql" );
 565                 if ( $err !== true ) {
 566                         echo " <b>FAILED</b></li>";
 567                         dieout( htmlspecialchars( $err ) );
 568                 }
 569                 echo " done.</li>";
 570
 571                 # Use DatabasePostgres's code to populate interwiki from MySQL template
 572                 $f = fopen( "$IP/maintenance/interwiki.sql", 'r' );
 573                 if ( !$f ) {
 574                         dieout( "Could not find the interwiki.sql file." );
 575                 }
 576
 577                 $sql = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local,iw_api,iw_wikiid) VALUES ";
 578                 while ( !feof( $f ) ) {
 579                         $line = fgets( $f, 1024 );
 580                         $matches = array();
 581                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) continue;
 582                         $this->query( "$sql $matches[1],$matches[2],'','')" );
 583                 }
 584         }
 585
 586         public function getSearchEngine() {
 587                 return "SearchSqlite";
 588         }
 589
 590         /**
 591          * No-op version of deadlockLoop
 592          */
 593         public function deadlockLoop( /*...*/ ) {
 594                 $args = func_get_args();
 595                 $function = array_shift( $args );
 596                 return call_user_func_array( $function, $args );
 597         }
 598
 599         protected function replaceVars( $s ) {
 600                 $s = parent::replaceVars( $s );
 601                 if ( preg_match( '/^\s*(CREATE|ALTER) TABLE/i', $s ) ) {
 602                         // CREATE TABLE hacks to allow schema file sharing with MySQL
 603
 604                         // binary/varbinary column type -> blob
 605                         $s = preg_replace( '/\b(var)?binary(\(\d+\))/i', 'BLOB', $s );
 606                         // no such thing as unsigned
 607                         $s = preg_replace( '/\b(un)?signed\b/i', '', $s );
 608                         // INT -> INTEGER
 609                         $s = preg_replace( '/\b(tiny|small|medium|big|)int(\s*\([\s\d]*\)|\b)/i', 'INTEGER', $s );
 610                         // varchar -> TEXT
 611                         $s = preg_replace( '/\b(var)?char\s*\(.*?\)/i', 'TEXT', $s );
 612                         // TEXT normalization
 613                         $s = preg_replace( '/\b(tiny|medium|long)text\b/i', 'TEXT', $s );
 614                         // BLOB normalization
 615                         $s = preg_replace( '/\b(tiny|small|medium|long|)blob\b/i', 'BLOB', $s );
 616                         // BOOL -> INTEGER
 617                         $s = preg_replace( '/\bbool(ean)?\b/i', 'INTEGER', $s );
 618                         // DATETIME -> TEXT
 619                         $s = preg_replace( '/\b(datetime|timestamp)\b/i', 'TEXT', $s );
 620                         // No ENUM type
 621                         $s = preg_replace( '/\benum\s*\([^)]*\)/i', 'TEXT', $s );
 622                         // binary collation type -> nothing
 623                         $s = preg_replace( '/\bbinary\b/i', '', $s );
 624                         // auto_increment -> autoincrement
 625                         $s = preg_replace( '/\bauto_increment\b/i', 'AUTOINCREMENT', $s );
 626                         // No explicit options
 627                         $s = preg_replace( '/\)[^);]*(;?)\s*$/', ')\1', $s );
 628                 } elseif ( preg_match( '/^\s*CREATE (\s*(?:UNIQUE|FULLTEXT)\s+)?INDEX/i', $s ) ) {
 629                         // No truncated indexes
 630                         $s = preg_replace( '/\(\d+\)/', '', $s );
 631                         // No FULLTEXT
 632                         $s = preg_replace( '/\bfulltext\b/i', '', $s );
 633                 }
 634                 return $s;
 635         }
 636
 637         /*
 638          * Build a concatenation list to feed into a SQL query
 639          */
 640         function buildConcat( $stringList ) {
 641                 return '(' . implode( ') || (', $stringList ) . ')';
 642         }
 643
 644         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseSqlite::duplicateTableStructure' ) {
 645                 $res = $this->query( "SELECT sql FROM sqlite_master WHERE tbl_name='$oldName' AND type='table'", $fname );
 646                 $obj = $this->fetchObject( $res );
 647                 if ( !$obj ) {
 648                         throw new MWException( "Couldn't retrieve structure for table $oldName" );
 649                 }
 650                 $sql = $obj->sql;
 651                 $sql = preg_replace( '/\b' . preg_quote( $oldName ) . '\b/', $newName, $sql, 1 );
 652                 return $this->query( $sql, $fname );
 653         }
 654
 655 } // end DatabaseSqlite class
 656
 657 /**
 658  * This class allows simple acccess to a SQLite database independently from main database settings
 659  * @ingroup Database
 660  */
 661 class DatabaseSqliteStandalone extends DatabaseSqlite {
 662         public function __construct( $fileName, $flags = 0 ) {
 663                 $this->mFlags = $flags;
 664                 $this->tablePrefix( null );
 665                 $this->openFile( $fileName );
 666         }
 667 }
 668
 669 /**
 670  * @ingroup Database
 671  */
 672 class SQLiteField {
 673         private $info, $tableName;
 674         function __construct( $info, $tableName ) {
 675                 $this->info = $info;
 676                 $this->tableName = $tableName;
 677         }
 678
 679         function name() {
 680                 return $this->info->name;
 681         }
 682
 683         function tableName() {
 684                 return $this->tableName;
 685         }
 686
 687         function defaultValue() {
 688                 if ( is_string( $this->info->dflt_value ) ) {
 689                         // Typically quoted
 690                         if ( preg_match( '/^\'(.*)\'$', $this->info->dflt_value ) ) {
 691                                 return str_replace( "''", "'", $this->info->dflt_value );
 692                         }
 693                 }
 694                 return $this->info->dflt_value;
 695         }
 696
 697         function maxLength() {
 698                 return -1;
 699         }
 700
 701         function nullable() {
 702                 // SQLite dynamic types are always nullable
 703                 return true;
 704         }
 705
 706         # isKey(),  isMultipleKey() not implemented, MySQL-specific concept.
 707         # Suggest removal from base class [TS]
 708
 709         function type() {
 710                 return $this->info->type;
 711         }
 712
 713 } // end SQLiteField