includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * @file
   6  * @ingroup Database
   7  */
   8
   9 /**
  10  * @ingroup Database
  11  */
  12 class ORABlob {
  13         var $mData;
  14
  15         function __construct( $data ) {
  16                 $this->mData = $data;
  17         }
  18
  19         function getData() {
  20                 return $this->mData;
  21         }
  22 }
  23
  24 /**
  25  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  26  * other things.  We use a wrapper class to handle that and other
  27  * Oracle-specific bits, like converting column names back to lowercase.
  28  * @ingroup Database
  29  */
  30 class ORAResult {
  31         private $rows;
  32         private $cursor;
  33         private $stmt;
  34         private $nrows;
  35
  36         private function array_unique_md( $array_in ) {
  37                 $array_out = array();
  38                 $array_hashes = array();
  39
  40                 foreach ( $array_in as $item ) {
  41                         $hash = md5( serialize( $item ) );
  42                         if ( !isset( $array_hashes[$hash] ) ) {
  43                                 $array_hashes[$hash] = $hash;
  44                                 $array_out[] = $item;
  45                         }
  46                 }
  47
  48                 return $array_out;
  49         }
  50
  51         function __construct( &$db, $stmt, $unique = false ) {
  52                 $this->db =& $db;
  53
  54                 if ( ( $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, - 1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM ) ) === false ) {
  55                         $e = oci_error( $stmt );
  56                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  57                         return;
  58                 }
  59
  60                 if ( $unique ) {
  61                         $this->rows = $this->array_unique_md( $this->rows );
  62                         $this->nrows = count( $this->rows );
  63                 }
  64
  65                 $this->cursor = 0;
  66                 $this->stmt = $stmt;
  67         }
  68
  69         public function free() {
  70                 oci_free_statement( $this->stmt );
  71         }
  72
  73         public function seek( $row ) {
  74                 $this->cursor = min( $row, $this->nrows );
  75         }
  76
  77         public function numRows() {
  78                 return $this->nrows;
  79         }
  80
  81         public function numFields() {
  82                 return oci_num_fields( $this->stmt );
  83         }
  84
  85         public function fetchObject() {
  86                 if ( $this->cursor >= $this->nrows ) {
  87                         return false;
  88                 }
  89                 $row = $this->rows[$this->cursor++];
  90                 $ret = new stdClass();
  91                 foreach ( $row as $k => $v ) {
  92                         $lc = strtolower( oci_field_name( $this->stmt, $k + 1 ) );
  93                         $ret->$lc = $v;
  94                 }
  95
  96                 return $ret;
  97         }
  98
  99         public function fetchRow() {
 100                 if ( $this->cursor >= $this->nrows ) {
 101                         return false;
 102                 }
 103
 104                 $row = $this->rows[$this->cursor++];
 105                 $ret = array();
 106                 foreach ( $row as $k => $v ) {
 107                         $lc = strtolower( oci_field_name( $this->stmt, $k + 1 ) );
 108                         $ret[$lc] = $v;
 109                         $ret[$k] = $v;
 110                 }
 111                 return $ret;
 112         }
 113 }
 114
 115 /**
 116  * Utility class.
 117  * @ingroup Database
 118  */
 119 class ORAField {
 120         private $name, $tablename, $default, $max_length, $nullable,
 121                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 122
 123         function __construct( $info ) {
 124                 $this->name = $info['column_name'];
 125                 $this->tablename = $info['table_name'];
 126                 $this->default = $info['data_default'];
 127                 $this->max_length = $info['data_length'];
 128                 $this->nullable = $info['not_null'];
 129                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 130                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 131                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 132                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 133                 $this->type = $info['data_type'];
 134         }
 135
 136         function name() {
 137                 return $this->name;
 138         }
 139
 140         function tableName() {
 141                 return $this->tablename;
 142         }
 143
 144         function defaultValue() {
 145                 return $this->default;
 146         }
 147
 148         function maxLength() {
 149                 return $this->max_length;
 150         }
 151
 152         function nullable() {
 153                 return $this->nullable;
 154         }
 155
 156         function isKey() {
 157                 return $this->is_key;
 158         }
 159
 160         function isMultipleKey() {
 161                 return $this->is_multiple;
 162         }
 163
 164         function type() {
 165                 return $this->type;
 166         }
 167 }
 168
 169 /**
 170  * @ingroup Database
 171  */
 172 class DatabaseOracle extends DatabaseBase {
 173         var $mInsertId = null;
 174         var $mLastResult = null;
 175         var $numeric_version = null;
 176         var $lastResult = null;
 177         var $cursor = 0;
 178         var $mAffectedRows;
 179
 180         var $ignore_DUP_VAL_ON_INDEX = false;
 181         var $sequenceData = null;
 182
 183         var $defaultCharset = 'AL32UTF8';
 184
 185         var $mFieldInfoCache = array();
 186
 187         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 188                 $flags = 0, $tablePrefix = 'get from global' )
 189         {
 190                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper( $tablePrefix );
 191                 parent::__construct( $server, $user, $password, $dbName, $flags, $tablePrefix );
 192                 wfRunHooks( 'DatabaseOraclePostInit', array( &$this ) );
 193         }
 194
 195         function getType() {
 196                 return 'oracle';
 197         }
 198
 199         function cascadingDeletes() {
 200                 return true;
 201         }
 202         function cleanupTriggers() {
 203                 return true;
 204         }
 205         function strictIPs() {
 206                 return true;
 207         }
 208         function realTimestamps() {
 209                 return true;
 210         }
 211         function implicitGroupby() {
 212                 return false;
 213         }
 214         function implicitOrderby() {
 215                 return false;
 216         }
 217         function searchableIPs() {
 218                 return true;
 219         }
 220
 221         static function newFromParams( $server, $user, $password, $dbName, $flags = 0, $tablePrefix ) {
 222                 return new DatabaseOracle( $server, $user, $password, $dbName, $flags, $tablePrefix );
 223         }
 224
 225         /**
 226          * Usually aborts on failure
 227          */
 228         function open( $server, $user, $password, $dbName ) {
 229                 if ( !function_exists( 'oci_connect' ) ) {
 230                         throw new DBConnectionError( $this, "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n (Note: if you recently installed PHP, you may need to restart your webserver and database)\n" );
 231                 }
 232
 233                 $this->close();
 234                 $this->mUser = $user;
 235                 $this->mPassword = $password;
 236                 // changed internal variables functions
 237                 // mServer now holds the TNS endpoint
 238                 // mDBname is schema name if different from username
 239                 if ( !$server ) {
 240                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 241                         $this->mServer = $dbName;
 242                         $this->mDBname = $user;
 243                 } else {
 244                         $this->mServer = $server;
 245                         if ( !$dbName ) {
 246                                 $this->mDBname = $user;
 247                         } else {
 248                                 $this->mDBname = $dbName;
 249                         }
 250                 }
 251
 252                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 253                         return;
 254                 }
 255
 256                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 257                 if ( $this->mFlags & DBO_DEFAULT ) {
 258                         $this->mConn = oci_new_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 259                 } else {
 260                         $this->mConn = oci_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 261                 }
 262
 263                 if ( $this->mUser != $this->mDBname ) {
 264                         //change current schema in session
 265                         $this->selectDB( $this->mDBname );
 266                 }
 267
 268                 if ( !$this->mConn ) {
 269                         wfDebug( "DB connection error\n" );
 270                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 271                         wfDebug( $this->lastError() . "\n" );
 272                         return false;
 273                 }
 274
 275                 $this->mOpened = true;
 276
 277                 # removed putenv calls because they interfere with the system globaly
 278                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 279                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 280                 return $this->mConn;
 281         }
 282
 283         /**
 284          * Closes a database connection, if it is open
 285          * Returns success, true if already closed
 286          */
 287         function close() {
 288                 $this->mOpened = false;
 289                 if ( $this->mConn ) {
 290                         return oci_close( $this->mConn );
 291                 } else {
 292                         return true;
 293                 }
 294         }
 295
 296         function execFlags() {
 297                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 298         }
 299
 300         function doQuery( $sql ) {
 301                 wfDebug( "SQL: [$sql]\n" );
 302                 if ( !mb_check_encoding( $sql ) ) {
 303                         throw new MWException( "SQL encoding is invalid\n$sql" );
 304                 }
 305
 306                 // handle some oracle specifics
 307                 // remove AS column/table/subquery namings
 308                 if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
 309                         $sql = preg_replace( '/ as /i', ' ', $sql );
 310                 }
 311                 // Oracle has issues with UNION clause if the statement includes LOB fields
 312                 // So we do a UNION ALL and then filter the results array with array_unique
 313                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 314                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 315                 // you have to select data from plan table after explain
 316                 $explain_id = date( 'dmYHis' );
 317
 318                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 319
 320                 wfSuppressWarnings();
 321
 322                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 323                         $e = oci_error( $this->mConn );
 324                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 325                         return false;
 326                 }
 327
 328                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 329                         $e = oci_error( $stmt );
 330                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 331                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 332                                 return false;
 333                         }
 334                 }
 335
 336                 wfRestoreWarnings();
 337
 338                 if ( $explain_count > 0 ) {
 339                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 340                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 341                         return new ORAResult( $this, $stmt, $union_unique );
 342                 } else {
 343                         $this->mAffectedRows = oci_num_rows( $stmt );
 344                         return true;
 345                 }
 346         }
 347
 348         function queryIgnore( $sql, $fname = '' ) {
 349                 return $this->query( $sql, $fname, true );
 350         }
 351
 352         function freeResult( $res ) {
 353                 if ( $res instanceof ORAResult ) {
 354                         $res->free();
 355                 } else {
 356                         $res->result->free();
 357                 }
 358         }
 359
 360         function fetchObject( $res ) {
 361                 if ( $res instanceof ORAResult ) {
 362                         return $res->numRows();
 363                 } else {
 364                         return $res->result->fetchObject();
 365                 }
 366         }
 367
 368         function fetchRow( $res ) {
 369                 if ( $res instanceof ORAResult ) {
 370                         return $res->fetchRow();
 371                 } else {
 372                         return $res->result->fetchRow();
 373                 }
 374         }
 375
 376         function numRows( $res ) {
 377                 if ( $res instanceof ORAResult ) {
 378                         return $res->numRows();
 379                 } else {
 380                         return $res->result->numRows();
 381                 }
 382         }
 383
 384         function numFields( $res ) {
 385                 if ( $res instanceof ORAResult ) {
 386                         return $res->numFields();
 387                 } else {
 388                         return $res->result->numFields();
 389                 }
 390         }
 391
 392         function fieldName( $stmt, $n ) {
 393                 return oci_field_name( $stmt, $n );
 394         }
 395
 396         /**
 397          * This must be called after nextSequenceVal
 398          */
 399         function insertId() {
 400                 return $this->mInsertId;
 401         }
 402
 403         function dataSeek( $res, $row ) {
 404                 if ( $res instanceof ORAResult ) {
 405                         $res->seek( $row );
 406                 } else {
 407                         $res->result->seek( $row );
 408                 }
 409         }
 410
 411         function lastError() {
 412                 if ( $this->mConn === false ) {
 413                         $e = oci_error();
 414                 } else {
 415                         $e = oci_error( $this->mConn );
 416                 }
 417                 return $e['message'];
 418         }
 419
 420         function lastErrno() {
 421                 if ( $this->mConn === false ) {
 422                         $e = oci_error();
 423                 } else {
 424                         $e = oci_error( $this->mConn );
 425                 }
 426                 return $e['code'];
 427         }
 428
 429         function affectedRows() {
 430                 return $this->mAffectedRows;
 431         }
 432
 433         /**
 434          * Returns information about an index
 435          * If errors are explicitly ignored, returns NULL on failure
 436          */
 437         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 438                 return false;
 439         }
 440
 441         function indexUnique( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 442                 return false;
 443         }
 444
 445         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 446                 if ( !count( $a ) ) {
 447                         return true;
 448                 }
 449
 450                 if ( !is_array( $options ) ) {
 451                         $options = array( $options );
 452                 }
 453
 454                 if ( in_array( 'IGNORE', $options ) ) {
 455                         $this->ignore_DUP_VAL_ON_INDEX = true;
 456                 }
 457
 458                 if ( !is_array( reset( $a ) ) ) {
 459                         $a = array( $a );
 460                 }
 461
 462                 foreach ( $a as &$row ) {
 463                         $this->insertOneRow( $table, $row, $fname );
 464                 }
 465                 $retVal = true;
 466
 467                 if ( in_array( 'IGNORE', $options ) ) {
 468                         $this->ignore_DUP_VAL_ON_INDEX = false;
 469                 }
 470
 471                 return $retVal;
 472         }
 473
 474         private function insertOneRow( $table, $row, $fname ) {
 475                 global $wgContLang;
 476
 477                 $table = $this->tableName( $table );
 478                 // "INSERT INTO tables (a, b, c)"
 479                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 480                 $sql .= " VALUES (";
 481
 482                 // for each value, append ":key"
 483                 $first = true;
 484                 foreach ( $row as $col => $val ) {
 485                         if ( $first ) {
 486                                 $sql .= $val !== null ? ':' . $col : 'NULL';
 487                         } else {
 488                                 $sql .= $val !== null ? ', :' . $col : ', NULL';
 489                         }
 490
 491                         $first = false;
 492                 }
 493                 $sql .= ')';
 494
 495                 $stmt = oci_parse( $this->mConn, $sql );
 496                 foreach ( $row as $col => &$val ) {
 497                         $col_info = $this->fieldInfoMulti( $table, $col );
 498                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 499
 500                         if ( $val === null ) {
 501                                 // do nothing ... null was inserted in statement creation
 502                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 503                                 if ( is_object( $val ) ) {
 504                                         $val = $val->getData();
 505                                 }
 506
 507                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 508                                         $val = '31-12-2030 12:00:00.000000';
 509                                 }
 510
 511                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 512                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
 513                                         $this->reportQueryError( $this->lastErrno(), $this->lastError(), $sql, __METHOD__ );
 514                                         return false;
 515                                 }
 516                         } else {
 517                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 518                                         $e = oci_error( $stmt );
 519                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 520                                 }
 521
 522                                 if ( $col_type == 'BLOB' ) { // is_object($val)) {
 523                                         $lob[$col]->writeTemporary( $val ); // ->getData());
 524                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
 525                                 } else {
 526                                         $lob[$col]->writeTemporary( $val );
 527                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 528                                 }
 529                         }
 530                 }
 531
 532                 wfSuppressWarnings();
 533
 534                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
 535                         $e = oci_error( $stmt );
 536
 537                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 538                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 539                                 return false;
 540                         } else {
 541                                 $this->mAffectedRows = oci_num_rows( $stmt );
 542                         }
 543                 } else {
 544                         $this->mAffectedRows = oci_num_rows( $stmt );
 545                 }
 546
 547                 wfRestoreWarnings();
 548
 549                 if ( isset( $lob ) ) {
 550                         foreach ( $lob as $lob_v ) {
 551                                 $lob_v->free();
 552                         }
 553                 }
 554
 555                 if ( !$this->mTrxLevel ) {
 556                         oci_commit( $this->mConn );
 557                 }
 558
 559                 oci_free_statement( $stmt );
 560         }
 561
 562         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 563                 $insertOptions = array(), $selectOptions = array() )
 564         {
 565                 $destTable = $this->tableName( $destTable );
 566                 if ( !is_array( $selectOptions ) ) {
 567                         $selectOptions = array( $selectOptions );
 568                 }
 569                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 570                 if ( is_array( $srcTable ) ) {
 571                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 572                 } else {
 573                         $srcTable = $this->tableName( $srcTable );
 574                 }
 575
 576                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 577                                 !isset( $varMap[$sequenceData['column']] ) )
 578                 {
 579                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 580                 }
 581
 582                 // count-alias subselect fields to avoid abigious definition errors
 583                 $i = 0;
 584                 foreach ( $varMap as &$val ) {
 585                         $val = $val . ' field' . ( $i++ );
 586                 }
 587
 588                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 589                         " SELECT $startOpts " . implode( ',', $varMap ) .
 590                         " FROM $srcTable $useIndex ";
 591                 if ( $conds != '*' ) {
 592                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 593                 }
 594                 $sql .= " $tailOpts";
 595
 596                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 597                         $this->ignore_DUP_VAL_ON_INDEX = true;
 598                 }
 599
 600                 $retval = $this->query( $sql, $fname );
 601
 602                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 603                         $this->ignore_DUP_VAL_ON_INDEX = false;
 604                 }
 605
 606                 return $retval;
 607         }
 608
 609         function tableName( $name ) {
 610                 global $wgSharedDB, $wgSharedPrefix, $wgSharedTables;
 611                 /*
 612                 Replace reserved words with better ones
 613                 Using uppercase because that's the only way Oracle can handle
 614                 quoted tablenames
 615                 */
 616                 switch( $name ) {
 617                         case 'user':
 618                                 $name = 'MWUSER';
 619                                 break;
 620                         case 'text':
 621                                 $name = 'PAGECONTENT';
 622                                 break;
 623                 }
 624
 625                 /*
 626                         The rest of procedure is equal to generic Databse class
 627                         except for the quoting style
 628                 */
 629                 if ( $name[0] == '"' && substr( $name, - 1, 1 ) == '"' ) {
 630                         return $name;
 631                 }
 632                 if ( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) {
 633                         return $name;
 634                 }
 635                 $dbDetails = array_reverse( explode( '.', $name, 2 ) );
 636                 if ( isset( $dbDetails[1] ) ) {
 637                         @list( $table, $database ) = $dbDetails;
 638                 } else {
 639                         @list( $table ) = $dbDetails;
 640                 }
 641
 642                 $prefix = $this->mTablePrefix;
 643
 644                 if ( isset( $database ) ) {
 645                         $table = ( $table[0] == '`' ? $table : "`{$table}`" );
 646                 }
 647
 648                 if ( !isset( $database ) && isset( $wgSharedDB ) && $table[0] != '"'
 649                         && isset( $wgSharedTables )
 650                         && is_array( $wgSharedTables )
 651                         && in_array( $table, $wgSharedTables )
 652                 ) {
 653                         $database = $wgSharedDB;
 654                         $prefix   = isset( $wgSharedPrefix ) ? $wgSharedPrefix : $prefix;
 655                 }
 656
 657                 if ( isset( $database ) ) {
 658                         $database = ( $database[0] == '"' ? $database : "\"{$database}\"" );
 659                 }
 660                 $table = ( $table[0] == '"' ? $table : "\"{$prefix}{$table}\"" );
 661
 662                 $tableName = ( isset( $database ) ? "{$database}.{$table}" : "{$table}" );
 663
 664                 return strtoupper( $tableName );
 665         }
 666
 667         /**
 668          * Return the next in a sequence, save the value for retrieval via insertId()
 669          */
 670         function nextSequenceValue( $seqName ) {
 671                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 672                 $row = $this->fetchRow( $res );
 673                 $this->mInsertId = $row[0];
 674                 return $this->mInsertId;
 675         }
 676
 677         /**
 678          * Return sequence_name if table has a sequence
 679          */
 680         private function getSequenceData( $table ) {
 681                 if ( $this->sequenceData == null ) {
 682                         $result = $this->query( "SELECT lower(us.sequence_name), lower(utc.table_name), lower(utc.column_name) from user_sequences us, user_tab_columns utc where us.sequence_name = utc.table_name||'_'||utc.column_name||'_SEQ'" );
 683
 684                         while ( ( $row = $result->fetchRow() ) !== false ) {
 685                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 686                                         'sequence' => $row[0],
 687                                         'column' => $row[2]
 688                                 );
 689                         }
 690                 }
 691
 692                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 693         }
 694
 695         /**
 696          * REPLACE query wrapper
 697          * Oracle simulates this with a DELETE followed by INSERT
 698          * $row is the row to insert, an associative array
 699          * $uniqueIndexes is an array of indexes. Each element may be either a
 700          * field name or an array of field names
 701          *
 702          * It may be more efficient to leave off unique indexes which are unlikely to collide.
 703          * However if you do this, you run the risk of encountering errors which wouldn't have
 704          * occurred in MySQL.
 705          *
 706          * @param $table String: table name
 707          * @param $uniqueIndexes Array: array of indexes. Each element may be
 708          *                       either a field name or an array of field names
 709          * @param $rows Array: rows to insert to $table
 710          * @param $fname String: function name, you can use __METHOD__ here
 711          */
 712         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 713                 $table = $this->tableName( $table );
 714
 715                 if ( count( $rows ) == 0 ) {
 716                         return;
 717                 }
 718
 719                 # Single row case
 720                 if ( !is_array( reset( $rows ) ) ) {
 721                         $rows = array( $rows );
 722                 }
 723
 724                 $sequenceData = $this->getSequenceData( $table );
 725
 726                 foreach ( $rows as $row ) {
 727                         # Delete rows which collide
 728                         if ( $uniqueIndexes ) {
 729                                 $condsDelete = array();
 730                                 foreach ( $uniqueIndexes as $index ) {
 731                                         $condsDelete[$index] = $row[$index];
 732                                 }
 733                                 if ( count( $condsDelete ) > 0 ) {
 734                                         $this->delete( $table, $condsDelete, $fname );
 735                                 }
 736                         }
 737
 738                         if ( $sequenceData !== false && !isset( $row[$sequenceData['column']] ) ) {
 739                                 $row[$sequenceData['column']] = $this->nextSequenceValue( $sequenceData['sequence'] );
 740                         }
 741
 742                         # Now insert the row
 743                         $this->insert( $table, $row, $fname );
 744                 }
 745         }
 746
 747         # DELETE where the condition is a join
 748         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabaseOracle::deleteJoin' ) {
 749                 if ( !$conds ) {
 750                         throw new DBUnexpectedError( $this, 'DatabaseOracle::deleteJoin() called with empty $conds' );
 751                 }
 752
 753                 $delTable = $this->tableName( $delTable );
 754                 $joinTable = $this->tableName( $joinTable );
 755                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 756                 if ( $conds != '*' ) {
 757                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 758                 }
 759                 $sql .= ')';
 760
 761                 $this->query( $sql, $fname );
 762         }
 763
 764         # Returns the size of a text field, or -1 for "unlimited"
 765         function textFieldSize( $table, $field ) {
 766                 $fieldInfoData = $this->fieldInfo( $table, $field);
 767                 if ( $fieldInfoData->type == 'varchar' ) {
 768                         $size = $row->size - 4;
 769                 } else {
 770                         $size = $row->size;
 771                 }
 772                 return $size;
 773         }
 774
 775         function limitResult( $sql, $limit, $offset = false ) {
 776                 if ( $offset === false ) {
 777                         $offset = 0;
 778                 }
 779                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 780         }
 781
 782         function unionQueries( $sqls, $all ) {
 783                 $glue = ' UNION ALL ';
 784                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 785         }
 786
 787         function wasDeadlock() {
 788                 return $this->lastErrno() == 'OCI-00060';
 789         }
 790
 791         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 792                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 793                 $oldName = trim( strtoupper( $oldName ), '"');
 794                 $oldParts = explode( '_', $oldName );
 795
 796                 $newName = trim( strtoupper( $newName ), '"');
 797                 $newParts = explode( '_', $newName );
 798
 799                 $oldPrefix = '';
 800                 $newPrefix = '';
 801                 for ( $i = count( $oldParts ) - 1; $i >= 0; $i-- ) {
 802                         if ( $oldParts[$i] != $newParts[$i] ) {
 803                                 $oldPrefix = implode( '_', $oldParts ) . '_';
 804                                 $newPrefix = implode( '_', $newParts ) . '_';
 805                                 break;
 806                         }
 807                         unset( $oldParts[$i] );
 808                         unset( $newParts[$i] );
 809                 }
 810
 811                 $tabName = substr( $oldName, strlen( $oldPrefix ) );
 812
 813                 return $this->query( 'BEGIN DUPLICATE_TABLE(\'' . $tabName . '\', \'' . $oldPrefix . '\', \''.$newPrefix.'\', ' . $temporary . '); END;', $fname );
 814         }
 815
 816         function timestamp( $ts = 0 ) {
 817                 return wfTimestamp( TS_ORACLE, $ts );
 818         }
 819
 820         /**
 821          * Return aggregated value function call
 822          */
 823         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 824                 return $valuedata;
 825         }
 826
 827         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 828                 # Ignore errors during error handling to avoid infinite
 829                 # recursion
 830                 $ignore = $this->ignoreErrors( true );
 831                 ++$this->mErrorCount;
 832
 833                 if ( $ignore || $tempIgnore ) {
 834                         wfDebug( "SQL ERROR (ignored): $error\n" );
 835                         $this->ignoreErrors( $ignore );
 836                 } else {
 837                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 838                 }
 839         }
 840
 841         /**
 842          * @return string wikitext of a link to the server software's web site
 843          */
 844         public static function getSoftwareLink() {
 845                 return '[http://www.oracle.com/ Oracle]';
 846         }
 847
 848         /**
 849          * @return string Version information from the database
 850          */
 851         function getServerVersion() {
 852                 //better version number, fallback on driver
 853                 $rset = $this->doQuery( 'SELECT version FROM product_component_version WHERE UPPER(product) LIKE \'ORACLE DATABASE%\'' );
 854                 if ( !( $row =  $rset->fetchRow() ) ) {
 855                         return oci_server_version( $this->mConn );
 856                 }
 857                 return $row['version'];
 858         }
 859
 860         /**
 861          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 862          */
 863         function tableExists( $table ) {
 864                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 865                 $res = $this->doQuery( $SQL );
 866                 if ( $res ) {
 867                         $count = $res->numRows();
 868                         $res->free();
 869                 } else {
 870                         $count = 0;
 871                 }
 872                 return $count;
 873         }
 874
 875         /**
 876          * Function translates mysql_fetch_field() functionality on ORACLE.
 877          * Caching is present for reducing query time.
 878          * For internal calls. Use fieldInfo for normal usage.
 879          * Returns false if the field doesn't exist
 880          *
 881          * @param $table Array
 882          * @param $field String
 883          */
 884         private function fieldInfoMulti( $table, $field ) {
 885                 $field = strtoupper( $field );
 886                 if ( is_array( $table ) ) {
 887                         $table = array_map( array( &$this, 'tableName' ), $table );
 888                         $tableWhere = 'IN (';
 889                         foreach( $table as &$singleTable ) {
 890                                 $singleTable = strtoupper( trim( $singleTable, '"' ) );
 891                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 892                                         return $this->mFieldInfoCache["$singleTable.$field"];
 893                                 }
 894                                 $tableWhere .= '\'' . $singleTable . '\',';
 895                         }
 896                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 897                 } else {
 898                         $table = strtoupper( trim( $this->tableName( $table ), '"' ) );
 899                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 900                                 return $this->mFieldInfoCache["$table.$field"];
 901                         }
 902                         $tableWhere = '= \''.$table.'\'';
 903                 }
 904
 905                 $fieldInfoStmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name '.$tableWhere.' and column_name = \''.$field.'\'' );
 906                 if ( oci_execute( $fieldInfoStmt, OCI_DEFAULT ) === false ) {
 907                         $e = oci_error( $fieldInfoStmt );
 908                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 909                         return false;
 910                 }
 911                 $res = new ORAResult( $this, $fieldInfoStmt );
 912                 if ( $res->numRows() == 0 ) {
 913                         if ( is_array( $table ) ) {
 914                                 foreach( $table as &$singleTable ) {
 915                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 916                                 }
 917                         } else {
 918                                 $this->mFieldInfoCache["$table.$field"] = false;
 919                         }
 920                 } else {
 921                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 922                         $table = $fieldInfoTemp->tableName();
 923                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 924                         return $fieldInfoTemp;
 925                 }
 926         }
 927
 928         function fieldInfo( $table, $field ) {
 929                 if ( is_array( $table ) ) {
 930                         throw new DBUnexpectedError( $this, 'Database::fieldInfo called with table array!' );
 931                 }
 932                 return $this->fieldInfoMulti ($table, $field);
 933         }
 934
 935         function begin( $fname = '' ) {
 936                 $this->mTrxLevel = 1;
 937         }
 938
 939         function commit( $fname = '' ) {
 940                 oci_commit( $this->mConn );
 941                 $this->mTrxLevel = 0;
 942         }
 943
 944         /* Not even sure why this is used in the main codebase... */
 945         function limitResultForUpdate( $sql, $num ) {
 946                 return $sql;
 947         }
 948
 949         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 950         function sourceStream( $fp, $lineCallback = false, $resultCallback = false ) {
 951                 $cmd = '';
 952                 $done = false;
 953                 $dollarquote = false;
 954
 955                 $replacements = array();
 956
 957                 while ( ! feof( $fp ) ) {
 958                         if ( $lineCallback ) {
 959                                 call_user_func( $lineCallback );
 960                         }
 961                         $line = trim( fgets( $fp, 1024 ) );
 962                         $sl = strlen( $line ) - 1;
 963
 964                         if ( $sl < 0 ) {
 965                                 continue;
 966                         }
 967                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
 968                                 continue;
 969                         }
 970
 971                         // Allow dollar quoting for function declarations
 972                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 973                                 if ( $dollarquote ) {
 974                                         $dollarquote = false;
 975                                         $done = true;
 976                                 } else {
 977                                         $dollarquote = true;
 978                                 }
 979                         } elseif ( !$dollarquote ) {
 980                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
 981                                         $done = true;
 982                                         $line = substr( $line, 0, $sl );
 983                                 }
 984                         }
 985
 986                         if ( $cmd != '' ) {
 987                                 $cmd .= ' ';
 988                         }
 989                         $cmd .= "$line\n";
 990
 991                         if ( $done ) {
 992                                 $cmd = str_replace( ';;', ";", $cmd );
 993                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
 994                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
 995                                                 $replacements[$defines[2]] = $defines[1];
 996                                         }
 997                                 } else {
 998                                         foreach ( $replacements as $mwVar => $scVar ) {
 999                                                 $cmd = str_replace( '&' . $scVar . '.', '{$' . $mwVar . '}', $cmd );
1000                                         }
1001
1002                                         $cmd = $this->replaceVars( $cmd );
1003                                         $res = $this->query( $cmd, __METHOD__ );
1004                                         if ( $resultCallback ) {
1005                                                 call_user_func( $resultCallback, $res, $this );
1006                                         }
1007
1008                                         if ( false === $res ) {
1009                                                 $err = $this->lastError();
1010                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1011                                         }
1012                                 }
1013
1014                                 $cmd = '';
1015                                 $done = false;
1016                         }
1017                 }
1018                 return true;
1019         }
1020
1021         function setup_database() {
1022                 $res = $this->sourceFile( "../maintenance/oracle/tables.sql" );
1023                 if ( $res === true ) {
1024                         print " done.</li>\n";
1025                 } else {
1026                         print " <b>FAILED</b></li>\n";
1027                         dieout( htmlspecialchars( $res ) );
1028                 }
1029
1030                 // Avoid the non-standard "REPLACE INTO" syntax
1031                 echo "<li>Populating interwiki table</li>\n";
1032                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1033                 if ( !$f ) {
1034                         dieout( "Could not find the interwiki.sql file" );
1035                 }
1036
1037                 // do it like the postgres :D
1038                 $SQL = "INSERT INTO " . $this->tableName( 'interwiki' ) . " (iw_prefix,iw_url,iw_local) VALUES ";
1039                 while ( !feof( $f ) ) {
1040                         $line = fgets( $f, 1024 );
1041                         $matches = array();
1042                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) {
1043                                 continue;
1044                         }
1045                         $this->query( "$SQL $matches[1],$matches[2])" );
1046                 }
1047
1048                 echo "<li>Table interwiki successfully populated</li>\n";
1049         }
1050
1051         function selectDB( $db ) {
1052                 if ( $db == null || $db == $this->mUser ) { return true; }
1053                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper($db);
1054                 $stmt = oci_parse( $this->mConn, $sql );
1055                 if ( !oci_execute( $stmt ) ) {
1056                         $e = oci_error( $stmt );
1057                         if ( $e['code'] != '1435' ) {
1058                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1059                         }
1060                         return false;
1061                 }
1062                 return true;
1063         }
1064
1065         function strencode( $s ) {
1066                 return str_replace( "'", "''", $s );
1067         }
1068
1069         function addQuotes( $s ) {
1070                 global $wgContLang;
1071                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1072                         $s = $wgContLang->checkTitleEncoding( $s );
1073                 }
1074                 return "'" . $this->strencode( $s ) . "'";
1075         }
1076
1077         function quote_ident( $s ) {
1078                 return $s;
1079         }
1080
1081         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1082                 global $wgContLang;
1083
1084                 $conds2 = array();
1085                 $conds = ( $conds != null && !is_array( $conds ) ) ? array( $conds ) : $conds;
1086                 foreach ( $conds as $col => $val ) {
1087                         $col_info = $this->fieldInfoMulti( $table, $col );
1088                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1089                         if ( $col_type == 'CLOB' ) {
1090                                 $conds2['TO_CHAR(' . $col . ')'] = $wgContLang->checkTitleEncoding( $val );
1091                         } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1092                                 $conds2[$col] = $wgContLang->checkTitleEncoding( $val );
1093                         } else {
1094                                 $conds2[$col] = $val;
1095                         }
1096                 }
1097
1098                 return parent::selectRow( $table, $vars, $conds2, $fname, $options, $join_conds );
1099         }
1100
1101         /**
1102          * Returns an optional USE INDEX clause to go after the table, and a
1103          * string to go at the end of the query
1104          *
1105          * @private
1106          *
1107          * @param $options Array: an associative array of options to be turned into
1108          *              an SQL query, valid keys are listed in the function.
1109          * @return array
1110          */
1111         function makeSelectOptions( $options ) {
1112                 $preLimitTail = $postLimitTail = '';
1113                 $startOpts = '';
1114
1115                 $noKeyOptions = array();
1116                 foreach ( $options as $key => $option ) {
1117                         if ( is_numeric( $key ) ) {
1118                                 $noKeyOptions[$option] = true;
1119                         }
1120                 }
1121
1122                 if ( isset( $options['GROUP BY'] ) ) {
1123                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1124                 }
1125                 if ( isset( $options['ORDER BY'] ) ) {
1126                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1127                 }
1128
1129                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1130                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1131                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1132                         $startOpts .= 'DISTINCT';
1133                 }
1134
1135                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1136                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1137                 } else {
1138                         $useIndex = '';
1139                 }
1140
1141                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1142         }
1143
1144         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1145                 global $wgContLang;
1146
1147                 if ( $wgContLang != null && $conds != '*' ) {
1148                         $conds2 = array();
1149                         $conds = ( $conds != null && !is_array( $conds ) ) ? array( $conds ) : $conds;
1150                         foreach ( $conds as $col => $val ) {
1151                                 $col_info = $this->fieldInfoMulti( $table, $col );
1152                                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1153                                 if ( $col_type == 'CLOB' ) {
1154                                         $conds2['TO_CHAR(' . $col . ')'] = $wgContLang->checkTitleEncoding( $val );
1155                                 } else {
1156                                         if ( is_array( $val ) ) {
1157                                                 $conds2[$col] = $val;
1158                                                 foreach ( $conds2[$col] as &$val2 ) {
1159                                                         $val2 = $wgContLang->checkTitleEncoding( $val2 );
1160                                                 }
1161                                         } else {
1162                                                 $conds2[$col] = $wgContLang->checkTitleEncoding( $val );
1163                                         }
1164                                 }
1165                         }
1166
1167                         return parent::delete( $table, $conds2, $fname );
1168                 } else {
1169                         return parent::delete( $table, $conds, $fname );
1170                 }
1171         }
1172
1173         function bitNot( $field ) {
1174                 // expecting bit-fields smaller than 4bytes
1175                 return 'BITNOT(' . $field . ')';
1176         }
1177
1178         function bitAnd( $fieldLeft, $fieldRight ) {
1179                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1180         }
1181
1182         function bitOr( $fieldLeft, $fieldRight ) {
1183                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1184         }
1185
1186         function setFakeMaster( $enabled = true ) { }
1187
1188         function getDBname() {
1189                 return $this->mDBname;
1190         }
1191
1192         function getServer() {
1193                 return $this->mServer;
1194         }
1195
1196         public function replaceVars( $ins ) {
1197                 $varnames = array( 'wgDBprefix' );
1198                 if ( $this->mFlags & DBO_SYSDBA ) {
1199                         $varnames[] = '_OracleDefTS';
1200                         $varnames[] = '_OracleTempTS';
1201                 }
1202
1203                 // Ordinary variables
1204                 foreach ( $varnames as $var ) {
1205                         if ( isset( $GLOBALS[$var] ) ) {
1206                                 $val = addslashes( $GLOBALS[$var] ); // FIXME: safety check?
1207                                 $ins = str_replace( '{$' . $var . '}', $val, $ins );
1208                                 $ins = str_replace( '/*$' . $var . '*/`', '`' . $val, $ins );
1209                                 $ins = str_replace( '/*$' . $var . '*/', $val, $ins );
1210                         }
1211                 }
1212
1213                 return parent::replaceVars( $ins );
1214         }
1215
1216         public function getSearchEngine() {
1217                 return 'SearchOracle';
1218         }
1219 } // end DatabaseOracle class