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                 $table = 'dummy_search_test';
 152                 $this->query( "DROP TABLE IF EXISTS $table", __METHOD__ );
 153
 154                 if ( $this->query( "CREATE VIRTUAL TABLE $table USING FTS3(dummy_field)", __METHOD__, true ) ) {
 155                         $this->query( "DROP TABLE IF EXISTS $table", __METHOD__ );
 156                         return 'FTS3';
 157                 }
 158                 return false;
 159         }
 160
 161         /**
 162          * Attaches external database to our connection, see http://sqlite.org/lang_attach.html
 163          * for details.
 164          * @param $name String: database name to be used in queries like SELECT foo FROM dbname.table
 165          * @param $file String: database file name. If omitted, will be generated using $name and $wgSQLiteDataDir
 166          * @param $fname String: calling function name
 167          */
 168         function attachDatabase( $name, $file = false, $fname = 'DatabaseSqlite::attachDatabase' ) {
 169                 global $wgSQLiteDataDir;
 170                 if ( !$file ) {
 171                         $file = self::generateFileName( $wgSQLiteDataDir, $name );
 172                 }
 173                 $file = $this->addQuotes( $file );
 174                 return $this->query( "ATTACH DATABASE $file AS $name", $fname );
 175         }
 176
 177         /**
 178          * @see DatabaseBase::isWriteQuery()
 179          */
 180         function isWriteQuery( $sql ) {
 181                 return parent::isWriteQuery( $sql ) && !preg_match( '/^ATTACH\b/i', $sql );
 182         }
 183
 184         /**
 185          * SQLite doesn't allow buffered results or data seeking etc, so we'll use fetchAll as the result
 186          */
 187         function doQuery( $sql ) {
 188                 $res = $this->mConn->query( $sql );
 189                 if ( $res === false ) {
 190                         return false;
 191                 } else {
 192                         $r = $res instanceof ResultWrapper ? $res->result : $res;
 193                         $this->mAffectedRows = $r->rowCount();
 194                         $res = new ResultWrapper( $this, $r->fetchAll() );
 195                 }
 196                 return $res;
 197         }
 198
 199         function freeResult( $res ) {
 200                 if ( $res instanceof ResultWrapper )
 201                         $res->result = null;
 202                 else
 203                         $res = null;
 204         }
 205
 206         function fetchObject( $res ) {
 207                 if ( $res instanceof ResultWrapper )
 208                         $r =& $res->result;
 209                 else
 210                         $r =& $res;
 211
 212                 $cur = current( $r );
 213                 if ( is_array( $cur ) ) {
 214                         next( $r );
 215                         $obj = new stdClass;
 216                         foreach ( $cur as $k => $v )
 217                                 if ( !is_numeric( $k ) )
 218                                         $obj->$k = $v;
 219
 220                         return $obj;
 221                 }
 222                 return false;
 223         }
 224
 225         function fetchRow( $res ) {
 226                 if ( $res instanceof ResultWrapper )
 227                         $r =& $res->result;
 228                 else
 229                         $r =& $res;
 230
 231                 $cur = current( $r );
 232                 if ( is_array( $cur ) ) {
 233                         next( $r );
 234                         return $cur;
 235                 }
 236                 return false;
 237         }
 238
 239         /**
 240          * The PDO::Statement class implements the array interface so count() will work
 241          */
 242         function numRows( $res ) {
 243                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 244                 return count( $r );
 245         }
 246
 247         function numFields( $res ) {
 248                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 249                 return is_array( $r ) ? count( $r[0] ) : 0;
 250         }
 251
 252         function fieldName( $res, $n ) {
 253                 $r = $res instanceof ResultWrapper ? $res->result : $res;
 254                 if ( is_array( $r ) ) {
 255                         $keys = array_keys( $r[0] );
 256                         return $keys[$n];
 257                 }
 258                 return  false;
 259         }
 260
 261         /**
 262          * Use MySQL's naming (accounts for prefix etc) but remove surrounding backticks
 263          */
 264         function tableName( $name ) {
 265                 return str_replace( '`', '', parent::tableName( $name ) );
 266         }
 267
 268         /**
 269          * Index names have DB scope
 270          */
 271         function indexName( $index ) {
 272                 return $index;
 273         }
 274
 275         /**
 276          * This must be called after nextSequenceVal
 277          */
 278         function insertId() {
 279                 return $this->mConn->lastInsertId();
 280         }
 281
 282         function dataSeek( $res, $row ) {
 283                 if ( $res instanceof ResultWrapper )
 284                         $r =& $res->result;
 285                 else
 286                         $r =& $res;
 287                 reset( $r );
 288                 if ( $row > 0 )
 289                         for ( $i = 0; $i < $row; $i++ )
 290                                 next( $r );
 291         }
 292
 293         function lastError() {
 294                 if ( !is_object( $this->mConn ) )
 295                         return "Cannot return last error, no db connection";
 296                 $e = $this->mConn->errorInfo();
 297                 return isset( $e[2] ) ? $e[2] : '';
 298         }
 299
 300         function lastErrno() {
 301                 if ( !is_object( $this->mConn ) ) {
 302                         return "Cannot return last error, no db connection";
 303                 } else {
 304                         $info = $this->mConn->errorInfo();
 305                         return $info[1];
 306                 }
 307         }
 308
 309         function affectedRows() {
 310                 return $this->mAffectedRows;
 311         }
 312
 313         /**
 314          * Returns information about an index
 315          * Returns false if the index does not exist
 316          * - if errors are explicitly ignored, returns NULL on failure
 317          */
 318         function indexInfo( $table, $index, $fname = 'DatabaseSqlite::indexExists' ) {
 319                 $sql = 'PRAGMA index_info(' . $this->addQuotes( $this->indexName( $index ) ) . ')';
 320                 $res = $this->query( $sql, $fname );
 321                 if ( !$res ) {
 322                         return null;
 323                 }
 324                 if ( $res->numRows() == 0 ) {
 325                         return false;
 326                 }
 327                 $info = array();
 328                 foreach ( $res as $row ) {
 329                         $info[] = $row->name;
 330                 }
 331                 return $info;
 332         }
 333
 334         function indexUnique( $table, $index, $fname = 'DatabaseSqlite::indexUnique' ) {
 335                 $row = $this->selectRow( 'sqlite_master', '*',
 336                         array(
 337                                 'type' => 'index',
 338                                 'name' => $this->indexName( $index ),
 339                         ), $fname );
 340                 if ( !$row || !isset( $row->sql ) ) {
 341                         return null;
 342                 }
 343
 344                 // $row->sql will be of the form CREATE [UNIQUE] INDEX ...
 345                 $indexPos = strpos( $row->sql, 'INDEX' );
 346                 if ( $indexPos === false ) {
 347                         return null;
 348                 }
 349                 $firstPart = substr( $row->sql, 0, $indexPos );
 350                 $options = explode( ' ', $firstPart );
 351                 return in_array( 'UNIQUE', $options );
 352         }
 353
 354         /**
 355          * Filter the options used in SELECT statements
 356          */
 357         function makeSelectOptions( $options ) {
 358                 foreach ( $options as $k => $v )
 359                         if ( is_numeric( $k ) && $v == 'FOR UPDATE' )
 360                                 $options[$k] = '';
 361                 return parent::makeSelectOptions( $options );
 362         }
 363
 364         /**
 365          * Based on generic method (parent) with some prior SQLite-sepcific adjustments
 366          */
 367         function insert( $table, $a, $fname = 'DatabaseSqlite::insert', $options = array() ) {
 368                 if ( !count( $a ) ) return true;
 369                 if ( !is_array( $options ) ) $options = array( $options );
 370
 371                 # SQLite uses OR IGNORE not just IGNORE
 372                 foreach ( $options as $k => $v )
 373                         if ( $v == 'IGNORE' )
 374                                 $options[$k] = 'OR IGNORE';
 375
 376                 # SQLite can't handle multi-row inserts, so divide up into multiple single-row inserts
 377                 if ( isset( $a[0] ) && is_array( $a[0] ) ) {
 378                         $ret = true;
 379                         foreach ( $a as $k => $v )
 380                                 if ( !parent::insert( $table, $v, "$fname/multi-row", $options ) )
 381                                         $ret = false;
 382                 } else {
 383                         $ret = parent::insert( $table, $a, "$fname/single-row", $options );
 384                 }
 385
 386                 return $ret;
 387         }
 388
 389         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseSqlite::replace' ) {
 390                 if ( !count( $rows ) ) return true;
 391
 392                 # SQLite can't handle multi-row replaces, so divide up into multiple single-row queries
 393                 if ( isset( $rows[0] ) && is_array( $rows[0] ) ) {
 394                         $ret = true;
 395                         foreach ( $rows as $k => $v )
 396                                 if ( !parent::replace( $table, $uniqueIndexes, $v, "$fname/multi-row" ) )
 397                                         $ret = false;
 398                 } else {
 399                         $ret = parent::replace( $table, $uniqueIndexes, $rows, "$fname/single-row" );
 400                 }
 401
 402                 return $ret;
 403         }
 404
 405         /**
 406          * Returns the size of a text field, or -1 for "unlimited"
 407          * In SQLite this is SQLITE_MAX_LENGTH, by default 1GB. No way to query it though.
 408          */
 409         function textFieldSize( $table, $field ) {
 410                 return - 1;
 411         }
 412
 413         function unionSupportsOrderAndLimit() {
 414                 return false;
 415         }
 416
 417         function unionQueries( $sqls, $all ) {
 418                 $glue = $all ? ' UNION ALL ' : ' UNION ';
 419                 return implode( $glue, $sqls );
 420         }
 421
 422         function wasDeadlock() {
 423                 return $this->lastErrno() == 5; // SQLITE_BUSY
 424         }
 425
 426         function wasErrorReissuable() {
 427                 return $this->lastErrno() ==  17; // SQLITE_SCHEMA;
 428         }
 429
 430         function wasReadOnlyError() {
 431                 return $this->lastErrno() == 8; // SQLITE_READONLY;
 432         }
 433
 434         /**
 435          * @return string wikitext of a link to the server software's web site
 436          */
 437         public static function getSoftwareLink() {
 438                 return "[http://sqlite.org/ SQLite]";
 439         }
 440
 441         /**
 442          * @return string Version information from the database
 443          */
 444         function getServerVersion() {
 445                 $ver = $this->mConn->getAttribute( PDO::ATTR_SERVER_VERSION );
 446                 return $ver;
 447         }
 448
 449         /**
 450          * Get information about a given field
 451          * Returns false if the field does not exist.
 452          */
 453         function fieldInfo( $table, $field ) {
 454                 $tableName = $this->tableName( $table );
 455                 $sql = 'PRAGMA table_info(' . $this->addQuotes( $tableName ) . ')';
 456                 $res = $this->query( $sql, __METHOD__ );
 457                 foreach ( $res as $row ) {
 458                         if ( $row->name == $field ) {
 459                                 return new SQLiteField( $row, $tableName );
 460                         }
 461                 }
 462                 return false;
 463         }
 464
 465         function begin( $fname = '' ) {
 466                 if ( $this->mTrxLevel == 1 ) $this->commit();
 467                 $this->mConn->beginTransaction();
 468                 $this->mTrxLevel = 1;
 469         }
 470
 471         function commit( $fname = '' ) {
 472                 if ( $this->mTrxLevel == 0 ) return;
 473                 $this->mConn->commit();
 474                 $this->mTrxLevel = 0;
 475         }
 476
 477         function rollback( $fname = '' ) {
 478                 if ( $this->mTrxLevel == 0 ) return;
 479                 $this->mConn->rollBack();
 480                 $this->mTrxLevel = 0;
 481         }
 482
 483         function limitResultForUpdate( $sql, $num ) {
 484                 return $this->limitResult( $sql, $num );
 485         }
 486
 487         function strencode( $s ) {
 488                 return substr( $this->addQuotes( $s ), 1, - 1 );
 489         }
 490
 491         function encodeBlob( $b ) {
 492                 return new Blob( $b );
 493         }
 494
 495         function decodeBlob( $b ) {
 496                 if ( $b instanceof Blob ) {
 497                         $b = $b->fetch();
 498                 }
 499                 return $b;
 500         }
 501
 502         function addQuotes( $s ) {
 503                 if ( $s instanceof Blob ) {
 504                         return "x'" . bin2hex( $s->fetch() ) . "'";
 505                 } else {
 506                         return $this->mConn->quote( $s );
 507                 }
 508         }
 509
 510         function quote_ident( $s ) {
 511                 return $s;
 512         }
 513
 514         function buildLike() {
 515                 $params = func_get_args();
 516                 if ( count( $params ) > 0 && is_array( $params[0] ) ) {
 517                         $params = $params[0];
 518                 }
 519                 return parent::buildLike( $params ) . "ESCAPE '\' ";
 520         }
 521
 522         /**
 523          * Called by the installer script (when modified according to the MediaWikiLite installation instructions)
 524          * - this is the same way PostgreSQL works, MySQL reads in tables.sql and interwiki.sql using dbsource (which calls db->sourceFile)
 525          */
 526         public function setup_database() {
 527                 global $IP;
 528
 529                 # Process common MySQL/SQLite table definitions
 530                 $err = $this->sourceFile( "$IP/maintenance/tables.sql" );
 531                 if ( $err !== true ) {
 532                         echo " <b>FAILED</b></li>";
 533                         dieout( htmlspecialchars( $err ) );
 534                 }
 535                 echo " done.</li>";
 536
 537                 # Use DatabasePostgres's code to populate interwiki from MySQL template
 538                 $f = fopen( "$IP/maintenance/interwiki.sql", 'r' );
 539                 if ( !$f ) {
 540                         dieout( "Could not find the interwiki.sql file." );
 541                 }
 542
 543                 $sql = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
 544                 while ( !feof( $f ) ) {
 545                         $line = fgets( $f, 1024 );
 546                         $matches = array();
 547                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) continue;
 548                         $this->query( "$sql $matches[1],$matches[2])" );
 549                 }
 550         }
 551
 552         public function getSearchEngine() {
 553                 return "SearchSqlite";
 554         }
 555
 556         /**
 557          * No-op version of deadlockLoop
 558          */
 559         public function deadlockLoop( /*...*/ ) {
 560                 $args = func_get_args();
 561                 $function = array_shift( $args );
 562                 return call_user_func_array( $function, $args );
 563         }
 564
 565         protected function replaceVars( $s ) {
 566                 $s = parent::replaceVars( $s );
 567                 if ( preg_match( '/^\s*(CREATE|ALTER) TABLE/i', $s ) ) {
 568                         // CREATE TABLE hacks to allow schema file sharing with MySQL
 569
 570                         // binary/varbinary column type -> blob
 571                         $s = preg_replace( '/\b(var)?binary(\(\d+\))/i', 'BLOB', $s );
 572                         // no such thing as unsigned
 573                         $s = preg_replace( '/\b(un)?signed\b/i', '', $s );
 574                         // INT -> INTEGER
 575                         $s = preg_replace( '/\b(tiny|small|medium|big|)int(\s*\([\s\d]*\)|\b)/i', 'INTEGER', $s );
 576                         // varchar -> TEXT
 577                         $s = preg_replace( '/\b(var)?char\s*\(.*?\)/i', 'TEXT', $s );
 578                         // TEXT normalization
 579                         $s = preg_replace( '/\b(tiny|medium|long)text\b/i', 'TEXT', $s );
 580                         // BLOB normalization
 581                         $s = preg_replace( '/\b(tiny|small|medium|long|)blob\b/i', 'BLOB', $s );
 582                         // BOOL -> INTEGER
 583                         $s = preg_replace( '/\bbool(ean)?\b/i', 'INTEGER', $s );
 584                         // DATETIME -> TEXT
 585                         $s = preg_replace( '/\b(datetime|timestamp)\b/i', 'TEXT', $s );
 586                         // No ENUM type
 587                         $s = preg_replace( '/\benum\s*\([^)]*\)/i', 'TEXT', $s );
 588                         // binary collation type -> nothing
 589                         $s = preg_replace( '/\bbinary\b/i', '', $s );
 590                         // auto_increment -> autoincrement
 591                         $s = preg_replace( '/\bauto_increment\b/i', 'AUTOINCREMENT', $s );
 592                         // No explicit options
 593                         $s = preg_replace( '/\)[^);]*(;?)\s*$/', ')\1', $s );
 594                 } elseif ( preg_match( '/^\s*CREATE (\s*(?:UNIQUE|FULLTEXT)\s+)?INDEX/i', $s ) ) {
 595                         // No truncated indexes
 596                         $s = preg_replace( '/\(\d+\)/', '', $s );
 597                         // No FULLTEXT
 598                         $s = preg_replace( '/\bfulltext\b/i', '', $s );
 599                 }
 600                 return $s;
 601         }
 602
 603         /*
 604          * Build a concatenation list to feed into a SQL query
 605          */
 606         function buildConcat( $stringList ) {
 607                 return '(' . implode( ') || (', $stringList ) . ')';
 608         }
 609
 610         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseSqlite::duplicateTableStructure' ) {
 611                 $res = $this->query( "SELECT sql FROM sqlite_master WHERE tbl_name='$oldName' AND type='table'", $fname );
 612                 $obj = $this->fetchObject( $res );
 613                 if ( !$obj ) {
 614                         throw new MWException( "Couldn't retrieve structure for table $oldName" );
 615                 }
 616                 $sql = $obj->sql;
 617                 $sql = preg_replace( '/\b' . preg_quote( $oldName ) . '\b/', $newName, $sql, 1 );
 618                 return $this->query( $sql, $fname );
 619         }
 620
 621 } // end DatabaseSqlite class
 622
 623 /**
 624  * This class allows simple acccess to a SQLite database independently from main database settings
 625  * @ingroup Database
 626  */
 627 class DatabaseSqliteStandalone extends DatabaseSqlite {
 628         public function __construct( $fileName, $flags = 0 ) {
 629                 $this->mFlags = $flags;
 630                 $this->openFile( $fileName );
 631         }
 632 }
 633
 634 /**
 635  * @ingroup Database
 636  */
 637 class SQLiteField {
 638         private $info, $tableName;
 639         function __construct( $info, $tableName ) {
 640                 $this->info = $info;
 641                 $this->tableName = $tableName;
 642         }
 643
 644         function name() {
 645                 return $this->info->name;
 646         }
 647
 648         function tableName() {
 649                 return $this->tableName;
 650         }
 651
 652         function defaultValue() {
 653                 if ( is_string( $this->info->dflt_value ) ) {
 654                         // Typically quoted
 655                         if ( preg_match( '/^\'(.*)\'$', $this->info->dflt_value ) ) {
 656                                 return str_replace( "''", "'", $this->info->dflt_value );
 657                         }
 658                 }
 659                 return $this->info->dflt_value;
 660         }
 661
 662         function maxLength() {
 663                 return -1;
 664         }
 665
 666         function nullable() {
 667                 // SQLite dynamic types are always nullable
 668                 return true;
 669         }
 670
 671         # isKey(),  isMultipleKey() not implemented, MySQL-specific concept.
 672         # Suggest removal from base class [TS]
 673
 674         function type() {
 675                 return $this->info->type;
 676         }
 677
 678 } // end SQLiteField