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