includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * @ingroup Database
   4  * @file
   5  */
   6
   7 /**
   8  * This is the Oracle database abstraction layer.
   9  * @ingroup Database
  10  */
  11 class ORABlob {
  12         var $mData;
  13
  14         function __construct( $data ) {
  15                 $this->mData = $data;
  16         }
  17
  18         function getData() {
  19                 return $this->mData;
  20         }
  21 }
  22
  23 /**
  24  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  25  * other things.  We use a wrapper class to handle that and other
  26  * Oracle-specific bits, like converting column names back to lowercase.
  27  * @ingroup Database
  28  */
  29 class ORAResult {
  30         private $rows;
  31         private $cursor;
  32         private $stmt;
  33         private $nrows;
  34
  35         private $unique;
  36         private function array_unique_md( $array_in ) {
  37                 $array_out = array();
  38                 $array_hashes = array();
  39
  40                 foreach ( $array_in as $key => $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'], '', __FUNCTION__ );
  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 $mFileInfoCache = array();
 186
 187         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 188                 $failFunction = false, $flags = 0, $tablePrefix = 'get from global' )
 189         {
 190                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper( $tablePrefix );
 191                 parent::__construct( $server, $user, $password, $dbName, $failFunction, $flags, $tablePrefix );
 192                 wfRunHooks( 'DatabaseOraclePostInit', array( &$this ) );
 193         }
 194
 195         function cascadingDeletes() {
 196                 return true;
 197         }
 198         function cleanupTriggers() {
 199                 return true;
 200         }
 201         function strictIPs() {
 202                 return true;
 203         }
 204         function realTimestamps() {
 205                 return true;
 206         }
 207         function implicitGroupby() {
 208                 return false;
 209         }
 210         function implicitOrderby() {
 211                 return false;
 212         }
 213         function searchableIPs() {
 214                 return true;
 215         }
 216
 217         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0 )
 218         {
 219                 return new DatabaseOracle( $server, $user, $password, $dbName, $failFunction, $flags );
 220         }
 221
 222         /**
 223          * Usually aborts on failure
 224          * If the failFunction is set to a non-zero integer, returns success
 225          */
 226         function open( $server, $user, $password, $dbName ) {
 227                 if ( !function_exists( 'oci_connect' ) ) {
 228                         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" );
 229                 }
 230
 231                 $this->close();
 232                 $this->mServer = $server;
 233                 $this->mUser = $user;
 234                 $this->mPassword = $password;
 235                 $this->mDBname = $dbName;
 236
 237                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 238                         return;
 239                 }
 240
 241                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 242                 if ( $this->mFlags & DBO_DEFAULT ) {
 243                         $this->mConn = oci_new_connect( $user, $password, $dbName, $this->defaultCharset, $session_mode );
 244                 } else {
 245                         $this->mConn = oci_connect( $user, $password, $dbName, $this->defaultCharset, $session_mode );
 246                 }
 247
 248                 if ( $this->mConn == false ) {
 249                         wfDebug( "DB connection error\n" );
 250                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 251                         wfDebug( $this->lastError() . "\n" );
 252                         return false;
 253                 }
 254
 255                 $this->mOpened = true;
 256
 257                 # removed putenv calls because they interfere with the system globaly
 258                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 259                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 260                 return $this->mConn;
 261         }
 262
 263         /**
 264          * Closes a database connection, if it is open
 265          * Returns success, true if already closed
 266          */
 267         function close() {
 268                 $this->mOpened = false;
 269                 if ( $this->mConn ) {
 270                         return oci_close( $this->mConn );
 271                 } else {
 272                         return true;
 273                 }
 274         }
 275
 276         function execFlags() {
 277                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 278         }
 279
 280         function doQuery( $sql ) {
 281                 wfDebug( "SQL: [$sql]\n" );
 282                 if ( !mb_check_encoding( $sql ) ) {
 283                         throw new MWException( "SQL encoding is invalid\n$sql" );
 284                 }
 285
 286                 // handle some oracle specifics
 287                 // remove AS column/table/subquery namings
 288                 if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
 289                         $sql = preg_replace( '/ as /i', ' ', $sql );
 290                 }
 291                 // Oracle has issues with UNION clause if the statement includes LOB fields
 292                 // So we do a UNION ALL and then filter the results array with array_unique
 293                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 294                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 295                 // you have to select data from plan table after explain
 296                 $olderr = error_reporting( E_ERROR );
 297                 $explain_id = date( 'dmYHis' );
 298                 error_reporting( $olderr );
 299
 300                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 301
 302
 303                 $olderr = error_reporting( E_ERROR );
 304
 305                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 306                         $e = oci_error( $this->mConn );
 307                         $this->reportQueryError( $e['message'], $e['code'], $sql, __FUNCTION__ );
 308                 }
 309
 310                 $olderr = error_reporting( E_ERROR );
 311                 if ( oci_execute( $stmt, $this->execFlags() ) == false ) {
 312                         $e = oci_error( $stmt );
 313                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 314                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __FUNCTION__ );
 315                         }
 316                 }
 317                 error_reporting( $olderr );
 318
 319                 if ( $explain_count > 0 ) {
 320                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 321                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 322                         return new ORAResult( $this, $stmt, $union_unique );
 323                 } else {
 324                         $this->mAffectedRows = oci_num_rows( $stmt );
 325                         return true;
 326                 }
 327         }
 328
 329         function queryIgnore( $sql, $fname = '' ) {
 330                 return $this->query( $sql, $fname, true );
 331         }
 332
 333         function freeResult( $res ) {
 334                 if ( $res instanceof ORAResult ) {
 335                         $res->free();
 336                 } else {
 337                         $res->result->free();
 338                 }
 339         }
 340
 341         function fetchObject( $res ) {
 342                 if ( $res instanceof ORAResult ) {
 343                         return $res->numRows();
 344                 } else {
 345                         return $res->result->fetchObject();
 346                 }
 347         }
 348
 349         function fetchRow( $res ) {
 350                 if ( $res instanceof ORAResult ) {
 351                         return $res->fetchRow();
 352                 } else {
 353                         return $res->result->fetchRow();
 354                 }
 355         }
 356
 357         function numRows( $res ) {
 358                 if ( $res instanceof ORAResult ) {
 359                         return $res->numRows();
 360                 } else {
 361                         return $res->result->numRows();
 362                 }
 363         }
 364
 365         function numFields( $res ) {
 366                 if ( $res instanceof ORAResult ) {
 367                         return $res->numFields();
 368                 } else {
 369                         return $res->result->numFields();
 370                 }
 371         }
 372
 373         function fieldName( $stmt, $n ) {
 374                 return oci_field_name( $stmt, $n );
 375         }
 376
 377         /**
 378          * This must be called after nextSequenceVal
 379          */
 380         function insertId() {
 381                 return $this->mInsertId;
 382         }
 383
 384         function dataSeek( $res, $row ) {
 385                 if ( $res instanceof ORAResult ) {
 386                         $res->seek( $row );
 387                 } else {
 388                         $res->result->seek( $row );
 389                 }
 390         }
 391
 392         function lastError() {
 393                 if ( $this->mConn === false ) {
 394                         $e = oci_error();
 395                 } else {
 396                         $e = oci_error( $this->mConn );
 397                 }
 398                 return $e['message'];
 399         }
 400
 401         function lastErrno() {
 402                 if ( $this->mConn === false ) {
 403                         $e = oci_error();
 404                 } else {
 405                         $e = oci_error( $this->mConn );
 406                 }
 407                 return $e['code'];
 408         }
 409
 410         function affectedRows() {
 411                 return $this->mAffectedRows;
 412         }
 413
 414         /**
 415          * Returns information about an index
 416          * If errors are explicitly ignored, returns NULL on failure
 417          */
 418         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 419                 return false;
 420         }
 421
 422         function indexUnique( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 423                 return false;
 424         }
 425
 426         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 427                 if ( !count( $a ) ) {
 428                         return true;
 429                 }
 430
 431                 if ( !is_array( $options ) ) {
 432                         $options = array( $options );
 433                 }
 434
 435                 if ( in_array( 'IGNORE', $options ) ) {
 436                         $this->ignore_DUP_VAL_ON_INDEX = true;
 437                 }
 438
 439                 if ( !is_array( reset( $a ) ) ) {
 440                         $a = array( $a );
 441                 }
 442
 443                 foreach ( $a as &$row ) {
 444                         $this->insertOneRow( $table, $row, $fname );
 445                 }
 446                 $retVal = true;
 447
 448                 if ( in_array( 'IGNORE', $options ) ) {
 449                         $this->ignore_DUP_VAL_ON_INDEX = false;
 450                 }
 451
 452                 return $retVal;
 453         }
 454
 455         function insertOneRow( $table, $row, $fname ) {
 456                 global $wgLang;
 457
 458                 // "INSERT INTO tables (a, b, c)"
 459                 $sql = "INSERT INTO " . $this->tableName( $table ) . " (" . join( ',', array_keys( $row ) ) . ')';
 460                 $sql .= " VALUES (";
 461
 462                 // for each value, append ":key"
 463                 $first = true;
 464                 foreach ( $row as $col => $val ) {
 465                         if ( $first ) {
 466                                 $sql .= $val !== null ? ':' . $col : 'NULL';
 467                         } else {
 468                                 $sql .= $val !== null ? ', :' . $col : ', NULL';
 469                         }
 470
 471                         $first = false;
 472                 }
 473                 $sql .= ')';
 474
 475                 $stmt = oci_parse( $this->mConn, $sql );
 476                 foreach ( $row as $col => &$val ) {
 477                         $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
 478
 479                         if ( $val === null ) {
 480                                 // do nothing ... null was inserted in statement creation
 481                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 482                                 if ( is_object( $val ) ) {
 483                                         $val = $val->getData();
 484                                 }
 485
 486                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 487                                         $val = '31-12-2030 12:00:00.000000';
 488                                 }
 489
 490                                 $val = ( $wgLang != null ) ? $wgLang->checkTitleEncoding( $val ) : $val;
 491                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
 492                                         $this->reportQueryError( $this->lastErrno(), $this->lastError(), $sql, __METHOD__ );
 493                                 }
 494                         } else {
 495                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 496                                         $e = oci_error( $stmt );
 497                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 498                                 }
 499
 500                                 if ( $col_type == 'BLOB' ) { // is_object($val)) {
 501                                         $lob[$col]->writeTemporary( $val ); // ->getData());
 502                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
 503                                 } else {
 504                                         $lob[$col]->writeTemporary( $val );
 505                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 506                                 }
 507                         }
 508                 }
 509
 510                 $olderr = error_reporting( E_ERROR );
 511                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
 512                         $e = oci_error( $stmt );
 513
 514                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 515                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 516                         } else {
 517                                 $this->mAffectedRows = oci_num_rows( $stmt );
 518                         }
 519                 } else {
 520                         $this->mAffectedRows = oci_num_rows( $stmt );
 521                 }
 522                 error_reporting( $olderr );
 523
 524                 if ( isset( $lob ) ) {
 525                         foreach ( $lob as $lob_i => $lob_v ) {
 526                                 $lob_v->free();
 527                         }
 528                 }
 529
 530                 if ( !$this->mTrxLevel ) {
 531                         oci_commit( $this->mConn );
 532                 }
 533
 534                 oci_free_statement( $stmt );
 535         }
 536
 537         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 538                 $insertOptions = array(), $selectOptions = array() )
 539         {
 540                 $destTable = $this->tableName( $destTable );
 541                 if ( !is_array( $selectOptions ) ) {
 542                         $selectOptions = array( $selectOptions );
 543                 }
 544                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 545                 if ( is_array( $srcTable ) ) {
 546                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 547                 } else {
 548                         $srcTable = $this->tableName( $srcTable );
 549                 }
 550
 551                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 552                                 !isset( $varMap[$sequenceData['column']] ) )
 553                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 554
 555                 // count-alias subselect fields to avoid abigious definition errors
 556                 $i = 0;
 557                 foreach ( $varMap as $key => &$val ) {
 558                         $val = $val . ' field' . ( $i++ );
 559                 }
 560
 561                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 562                         " SELECT $startOpts " . implode( ',', $varMap ) .
 563                         " FROM $srcTable $useIndex ";
 564                 if ( $conds != '*' ) {
 565                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 566                 }
 567                 $sql .= " $tailOpts";
 568
 569                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 570                         $this->ignore_DUP_VAL_ON_INDEX = true;
 571                 }
 572
 573                 $retval = $this->query( $sql, $fname );
 574
 575                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 576                         $this->ignore_DUP_VAL_ON_INDEX = false;
 577                 }
 578
 579                 return $retval;
 580         }
 581
 582         function tableName( $name ) {
 583                 global $wgSharedDB, $wgSharedPrefix, $wgSharedTables;
 584                 /*
 585                 Replace reserved words with better ones
 586                 Using uppercase because that's the only way Oracle can handle
 587                 quoted tablenames
 588                 */
 589                 switch( $name ) {
 590                         case 'user':
 591                                 $name = 'MWUSER';
 592                                 break;
 593                         case 'text':
 594                                 $name = 'PAGECONTENT';
 595                                 break;
 596                 }
 597
 598                 /*
 599                         The rest of procedure is equal to generic Databse class
 600                         except for the quoting style
 601                 */
 602                 if ( $name[0] == '"' && substr( $name, - 1, 1 ) == '"' ) {
 603                         return $name;
 604                 }
 605
 606                 if ( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) {
 607                         return $name;
 608                 }
 609                 $dbDetails = array_reverse( explode( '.', $name, 2 ) );
 610                 if ( isset( $dbDetails[1] ) ) {
 611                         @list( $table, $database ) = $dbDetails;
 612                 } else {
 613                         @list( $table ) = $dbDetails;
 614                 }
 615
 616                 $prefix = $this->mTablePrefix;
 617
 618                 if ( isset( $database ) ) {
 619                         $table = ( $table[0] == '`' ? $table : "`{$table}`" );
 620                 }
 621
 622                 if ( !isset( $database ) && isset( $wgSharedDB ) && $table[0] != '"'
 623                         && isset( $wgSharedTables )
 624                         && is_array( $wgSharedTables )
 625                         && in_array( $table, $wgSharedTables )
 626                 ) {
 627                         $database = $wgSharedDB;
 628                         $prefix   = isset( $wgSharedPrefix ) ? $wgSharedPrefix : $prefix;
 629                 }
 630
 631                 if ( isset( $database ) ) {
 632                         $database = ( $database[0] == '"' ? $database : "\"{$database}\"" );
 633                 }
 634                 $table = ( $table[0] == '"' ? $table : "\"{$prefix}{$table}\"" );
 635
 636                 $tableName = ( isset( $database ) ? "{$database}.{$table}" : "{$table}" );
 637
 638                 return strtoupper( $tableName );
 639         }
 640
 641         /**
 642          * Return the next in a sequence, save the value for retrieval via insertId()
 643          */
 644         function nextSequenceValue( $seqName ) {
 645                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 646                 $row = $this->fetchRow( $res );
 647                 $this->mInsertId = $row[0];
 648                 $this->freeResult( $res );
 649                 return $this->mInsertId;
 650         }
 651
 652         /**
 653          * Return sequence_name if table has a sequence
 654          */
 655         function getSequenceData( $table ) {
 656                 if ( $this->sequenceData == null ) {
 657                         $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'" );
 658
 659                         while ( ( $row = $result->fetchRow() ) !== false ) {
 660                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 661                                         'sequence' => $row[0],
 662                                         'column' => $row[2]
 663                                 );
 664                         }
 665                 }
 666
 667                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 668         }
 669
 670         # REPLACE query wrapper
 671         # Oracle simulates this with a DELETE followed by INSERT
 672         # $row is the row to insert, an associative array
 673         # $uniqueIndexes is an array of indexes. Each element may be either a
 674         # field name or an array of field names
 675         #
 676         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 677         # However if you do this, you run the risk of encountering errors which wouldn't have
 678         # occurred in MySQL
 679         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 680                 $table = $this->tableName( $table );
 681
 682                 if ( count( $rows ) == 0 ) {
 683                         return;
 684                 }
 685
 686                 # Single row case
 687                 if ( !is_array( reset( $rows ) ) ) {
 688                         $rows = array( $rows );
 689                 }
 690
 691                 $sequenceData = $this->getSequenceData( $table );
 692
 693                 foreach ( $rows as $row ) {
 694                         # Delete rows which collide
 695                         if ( $uniqueIndexes ) {
 696                                 $condsDelete = array();
 697                                 foreach ( $uniqueIndexes as $index )
 698                                         $condsDelete[$index] = $row[$index];
 699                                 $this->delete( $table, $condsDelete, $fname );
 700 /*
 701                                 $sql = "DELETE FROM $table WHERE ";
 702                                 $first = true;
 703                                 foreach ( $uniqueIndexes as $index ) {
 704                                         if ( $first ) {
 705                                                 $first = false;
 706                                                 $sql .= "(";
 707                                         } else {
 708                                                 $sql .= ') OR (';
 709                                         }
 710                                         if ( is_array( $index ) ) {
 711                                                 $first2 = true;
 712                                                 foreach ( $index as $col ) {
 713                                                         if ( $first2 ) {
 714                                                                 $first2 = false;
 715                                                         } else {
 716                                                                 $sql .= ' AND ';
 717                                                         }
 718                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 719                                                 }
 720                                         } else {
 721                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 722                                         }
 723                                 }
 724                                 $sql .= ')';
 725
 726                                 $this->doQuery( $sql);//, $fname );
 727 */
 728                         }
 729
 730                         if ( $sequenceData !== false && !isset( $row[$sequenceData['column']] ) ) {
 731                                 $row[$sequenceData['column']] = $this->nextSequenceValue( $sequenceData['sequence'] );
 732                         }
 733
 734                         # Now insert the row
 735                         $this->insert( $table, $row, $fname );
 736                 }
 737         }
 738
 739         # DELETE where the condition is a join
 740         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "DatabaseOracle::deleteJoin" ) {
 741                 if ( !$conds ) {
 742                         throw new DBUnexpectedError( $this,  'DatabaseOracle::deleteJoin() called with empty $conds' );
 743                 }
 744
 745                 $delTable = $this->tableName( $delTable );
 746                 $joinTable = $this->tableName( $joinTable );
 747                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 748                 if ( $conds != '*' ) {
 749                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 750                 }
 751                 $sql .= ')';
 752
 753                 $this->query( $sql, $fname );
 754         }
 755
 756         # Returns the size of a text field, or -1 for "unlimited"
 757         function textFieldSize( $table, $field ) {
 758                 $table = $this->tableName( $table );
 759                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 760                         FROM pg_class c, pg_attribute a, pg_type t
 761                         WHERE relname='$table' AND a.attrelid=c.oid AND
 762                                 a.atttypid=t.oid and a.attname='$field'";
 763                 $res = $this->query( $sql );
 764                 $row = $this->fetchObject( $res );
 765                 if ( $row->ftype == "varchar" ) {
 766                         $size = $row->size - 4;
 767                 } else {
 768                         $size = $row->size;
 769                 }
 770                 $this->freeResult( $res );
 771                 return $size;
 772         }
 773
 774         function limitResult( $sql, $limit, $offset = false ) {
 775                 if ( $offset === false ) {
 776                         $offset = 0;
 777                 }
 778                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 779         }
 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
 792         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 793                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 794                 return $this->query( 'BEGIN DUPLICATE_TABLE(\'' . $oldName . '\', \'' . $newName . '\', ' . $temporary . '); END;', $fname );
 795         }
 796
 797         function timestamp( $ts = 0 ) {
 798                 return wfTimestamp( TS_ORACLE, $ts );
 799         }
 800
 801         /**
 802          * Return aggregated value function call
 803          */
 804         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 805                 return $valuedata;
 806         }
 807
 808         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 809                 # Ignore errors during error handling to avoid infinite
 810                 # recursion
 811                 $ignore = $this->ignoreErrors( true );
 812                 ++$this->mErrorCount;
 813
 814                 if ( $ignore || $tempIgnore ) {
 815                         wfDebug( "SQL ERROR (ignored): $error\n" );
 816                         $this->ignoreErrors( $ignore );
 817                 } else {
 818                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 819                 }
 820         }
 821
 822         /**
 823          * @return string wikitext of a link to the server software's web site
 824          */
 825         function getSoftwareLink() {
 826                 return '[http://www.oracle.com/ Oracle]';
 827         }
 828
 829         /**
 830          * @return string Version information from the database
 831          */
 832         function getServerVersion() {
 833                 return oci_server_version( $this->mConn );
 834         }
 835
 836         /**
 837          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 838          */
 839         function tableExists( $table ) {
 840                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 841                 $res = $this->doQuery( $SQL );
 842                 if ( $res ) {
 843                         $count = $res->numRows();
 844                         $res->free();
 845                 } else {
 846                         $count = 0;
 847                 }
 848                 return $count;
 849         }
 850
 851         /**
 852          * Query whether a given column exists in the mediawiki schema
 853          * based on prebuilt table to simulate MySQL field info and keep query speed minimal
 854          */
 855         function fieldExists( $table, $field, $fname = 'DatabaseOracle::fieldExists' ) {
 856                 $table = trim( $table, '"' );
 857
 858                 if (isset($this->mFileInfoCache[$table.'.'.$field])) {
 859                         return true;
 860                 } elseif ( !isset( $this->fieldInfo_stmt ) ) {
 861                         $this->fieldInfo_stmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)' );
 862                 }
 863
 864                 oci_bind_by_name( $this->fieldInfo_stmt, ':tab', trim( $table, '"' ) );
 865                 oci_bind_by_name( $this->fieldInfo_stmt, ':col', $field );
 866
 867                 if ( oci_execute( $this->fieldInfo_stmt, OCI_DEFAULT ) === false ) {
 868                         $e = oci_error( $this->fieldInfo_stmt );
 869                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 870                         return false;
 871                 }
 872                 $res = new ORAResult( $this, $this->fieldInfo_stmt );
 873                 if ($res->numRows() != 0) {
 874                         $this->mFileInfoCache[$table.'.'.$field] = new ORAField( $res->fetchRow() );
 875                         return true;
 876                 } else {
 877                         return false;
 878                 }
 879         }
 880
 881         function fieldInfo( $table, $field ) {
 882                 $table = trim( $table, '"' );
 883
 884                 if (isset($this->mFileInfoCache[$table.'.'.$field])) {
 885                         return $this->mFileInfoCache[$table.'.'.$field];
 886                 } elseif ( !isset( $this->fieldInfo_stmt ) ) {
 887                         $this->fieldInfo_stmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)' );
 888                 }
 889
 890                 oci_bind_by_name( $this->fieldInfo_stmt, ':tab', $table );
 891                 oci_bind_by_name( $this->fieldInfo_stmt, ':col', $field );
 892
 893                 if ( oci_execute( $this->fieldInfo_stmt, OCI_DEFAULT ) === false ) {
 894                         $e = oci_error( $this->fieldInfo_stmt );
 895                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 896                         return false;
 897                 }
 898                 $res = new ORAResult( $this, $this->fieldInfo_stmt );
 899                 $this->mFileInfoCache[$table.'.'.$field] = new ORAField( $res->fetchRow() );
 900                 return $this->mFileInfoCache[$table.'.'.$field];
 901         }
 902
 903         function begin( $fname = '' ) {
 904                 $this->mTrxLevel = 1;
 905         }
 906
 907         function immediateCommit( $fname = '' ) {
 908                 return true;
 909         }
 910
 911         function commit( $fname = '' ) {
 912                 oci_commit( $this->mConn );
 913                 $this->mTrxLevel = 0;
 914         }
 915
 916         /* Not even sure why this is used in the main codebase... */
 917         function limitResultForUpdate( $sql, $num ) {
 918                 return $sql;
 919         }
 920
 921         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 922         function sourceStream( $fp, $lineCallback = false, $resultCallback = false ) {
 923                 $cmd = '';
 924                 $done = false;
 925                 $dollarquote = false;
 926
 927                 $replacements = array();
 928
 929                 while ( ! feof( $fp ) ) {
 930                         if ( $lineCallback ) {
 931                                 call_user_func( $lineCallback );
 932                         }
 933                         $line = trim( fgets( $fp, 1024 ) );
 934                         $sl = strlen( $line ) - 1;
 935
 936                         if ( $sl < 0 ) {
 937                                 continue;
 938                         }
 939                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
 940                                 continue;
 941                         }
 942
 943                         // Allow dollar quoting for function declarations
 944                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 945                                 if ( $dollarquote ) {
 946                                         $dollarquote = false;
 947                                         $done = true;
 948                                 } else {
 949                                         $dollarquote = true;
 950                                 }
 951                         } elseif ( !$dollarquote ) {
 952                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
 953                                         $done = true;
 954                                         $line = substr( $line, 0, $sl );
 955                                 }
 956                         }
 957
 958                         if ( '' != $cmd ) {
 959                                 $cmd .= ' ';
 960                         }
 961                         $cmd .= "$line\n";
 962
 963                         if ( $done ) {
 964                                 $cmd = str_replace( ';;', ";", $cmd );
 965                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
 966                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
 967                                                 $replacements[$defines[2]] = $defines[1];
 968                                         }
 969                                 } else {
 970                                         foreach ( $replacements as $mwVar => $scVar ) {
 971                                                 $cmd = str_replace( '&' . $scVar . '.', '{$' . $mwVar . '}', $cmd );
 972                                         }
 973
 974                                         $cmd = $this->replaceVars( $cmd );
 975                                         $res = $this->query( $cmd, __METHOD__ );
 976                                         if ( $resultCallback ) {
 977                                                 call_user_func( $resultCallback, $res, $this );
 978                                         }
 979
 980                                         if ( false === $res ) {
 981                                                 $err = $this->lastError();
 982                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
 983                                         }
 984                                 }
 985
 986                                 $cmd = '';
 987                                 $done = false;
 988                         }
 989                 }
 990                 return true;
 991         }
 992
 993         function setup_database() {
 994                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
 995
 996                 echo "<li>Creating DB objects</li>\n";
 997                 $res = $this->sourceFile( "../maintenance/ora/tables.sql" );
 998
 999                 // Avoid the non-standard "REPLACE INTO" syntax
1000                 echo "<li>Populating table interwiki</li>\n";
1001                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
1002                 if ( $f == false ) {
1003                         dieout( "<li>Could not find the interwiki.sql file</li>" );
1004                 }
1005
1006                 // do it like the postgres :D
1007                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
1008                 while ( !feof( $f ) ) {
1009                         $line = fgets( $f, 1024 );
1010                         $matches = array();
1011                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) {
1012                                 continue;
1013                         }
1014                         $this->query( "$SQL $matches[1],$matches[2])" );
1015                 }
1016
1017                 echo "<li>Table interwiki successfully populated</li>\n";
1018         }
1019
1020         function strencode( $s ) {
1021                 return str_replace( "'", "''", $s );
1022         }
1023
1024 /*
1025         function encodeBlob($b) {
1026                 return $b; //new ORABlob($b);
1027         }
1028         function decodeBlob($b) {
1029                 return $b; //return $b->load();
1030         }
1031 */
1032         function addQuotes( $s ) {
1033                 global $wgLang;
1034                 if ( isset( $wgLang->mLoaded ) && $wgLang->mLoaded ) {
1035                         $s = $wgLang->checkTitleEncoding( $s );
1036                 }
1037                 return "'" . $this->strencode( $s ) . "'";
1038         }
1039
1040         function quote_ident( $s ) {
1041                 return $s;
1042         }
1043
1044         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1045                 global $wgLang;
1046
1047                 $conds2 = array();
1048                 foreach ( $conds as $col => $val ) {
1049                         $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
1050                         if ( $col_type == 'CLOB' ) {
1051                                 $conds2['TO_CHAR(' . $col . ')'] = $wgLang->checkTitleEncoding( $val );
1052                         } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1053                                 $conds2[$col] = $wgLang->checkTitleEncoding( $val );
1054                         } else {
1055                                 $conds2[$col] = $val;
1056                         }
1057                 }
1058
1059                 if ( is_array( $table ) ) {
1060                         foreach ( $table as $tab ) {
1061                                 $tab = $this->tableName( $tab );
1062                         }
1063                 } else {
1064                         $table = $this->tableName( $table );
1065                 }
1066
1067                 return parent::selectRow( $table, $vars, $conds2, $fname, $options, $join_conds );
1068         }
1069
1070         /**
1071          * Returns an optional USE INDEX clause to go after the table, and a
1072          * string to go at the end of the query
1073          *
1074          * @private
1075          *
1076          * @param $options Array: an associative array of options to be turned into
1077          *              an SQL query, valid keys are listed in the function.
1078          * @return array
1079          */
1080         function makeSelectOptions( $options ) {
1081                 $preLimitTail = $postLimitTail = '';
1082                 $startOpts = '';
1083
1084                 $noKeyOptions = array();
1085                 foreach ( $options as $key => $option ) {
1086                         if ( is_numeric( $key ) ) {
1087                                 $noKeyOptions[$option] = true;
1088                         }
1089                 }
1090
1091                 if ( isset( $options['GROUP BY'] ) ) {
1092                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1093                 }
1094                 if ( isset( $options['ORDER BY'] ) ) {
1095                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1096                 }
1097
1098                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1099                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1100                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1101                         $startOpts .= 'DISTINCT';
1102                 }
1103
1104                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1105                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1106                 } else {
1107                         $useIndex = '';
1108                 }
1109
1110                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1111         }
1112
1113         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1114                 global $wgLang;
1115
1116                 if ( $wgLang != null ) {
1117                         $conds2 = array();
1118                         foreach ( $conds as $col => $val ) {
1119                                 $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
1120                                 if ( $col_type == 'CLOB' ) {
1121                                         $conds2['TO_CHAR(' . $col . ')'] = $wgLang->checkTitleEncoding( $val );
1122                                 } else {
1123                                         if ( is_array( $val ) ) {
1124                                                 $conds2[$col] = $val;
1125                                                 foreach ( $conds2[$col] as &$val2 ) {
1126                                                         $val2 = $wgLang->checkTitleEncoding( $val2 );
1127                                                 }
1128                                         } else {
1129                                                 $conds2[$col] = $wgLang->checkTitleEncoding( $val );
1130                                         }
1131                                 }
1132                         }
1133
1134                         return parent::delete( $table, $conds2, $fname );
1135                 } else {
1136                         return parent::delete( $table, $conds, $fname );
1137                 }
1138         }
1139
1140         function bitNot( $field ) {
1141                 // expecting bit-fields smaller than 4bytes
1142                 return 'BITNOT(' . $bitField . ')';
1143         }
1144
1145         function bitAnd( $fieldLeft, $fieldRight ) {
1146                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1147         }
1148
1149         function bitOr( $fieldLeft, $fieldRight ) {
1150                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1151         }
1152
1153         /**
1154          * How lagged is this slave?
1155          *
1156          * @return int
1157          */
1158         public function getLag() {
1159                 # Not implemented for Oracle
1160                 return 0;
1161         }
1162
1163         function setFakeSlaveLag( $lag ) { }
1164         function setFakeMaster( $enabled = true ) { }
1165
1166         function getDBname() {
1167                 return $this->mDBname;
1168         }
1169
1170         function getServer() {
1171                 return $this->mServer;
1172         }
1173
1174         public function replaceVars( $ins ) {
1175                 $varnames = array( 'wgDBprefix' );
1176                 if ( $this->mFlags & DBO_SYSDBA ) {
1177                         $varnames[] = 'wgDBOracleDefTS';
1178                         $varnames[] = 'wgDBOracleTempTS';
1179                 }
1180
1181                 // Ordinary variables
1182                 foreach ( $varnames as $var ) {
1183                         if ( isset( $GLOBALS[$var] ) ) {
1184                                 $val = addslashes( $GLOBALS[$var] ); // FIXME: safety check?
1185                                 $ins = str_replace( '{$' . $var . '}', $val, $ins );
1186                                 $ins = str_replace( '/*$' . $var . '*/`', '`' . $val, $ins );
1187                                 $ins = str_replace( '/*$' . $var . '*/', $val, $ins );
1188                         }
1189                 }
1190
1191                 return parent::replaceVars( $ins );
1192         }
1193
1194         public function getSearchEngine() {
1195                 return 'SearchOracle';
1196         }
1197 } // end DatabaseOracle class