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         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 186                 $failFunction = false, $flags = 0, $tablePrefix = 'get from global' )
 187         {
 188                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper( $tablePrefix );
 189                 parent::__construct( $server, $user, $password, $dbName, $failFunction, $flags, $tablePrefix );
 190                 wfRunHooks( 'DatabaseOraclePostInit', array( &$this ) );
 191         }
 192
 193         function cascadingDeletes() {
 194                 return true;
 195         }
 196         function cleanupTriggers() {
 197                 return true;
 198         }
 199         function strictIPs() {
 200                 return true;
 201         }
 202         function realTimestamps() {
 203                 return true;
 204         }
 205         function implicitGroupby() {
 206                 return false;
 207         }
 208         function implicitOrderby() {
 209                 return false;
 210         }
 211         function searchableIPs() {
 212                 return true;
 213         }
 214
 215         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0 )
 216         {
 217                 return new DatabaseOracle( $server, $user, $password, $dbName, $failFunction, $flags );
 218         }
 219
 220         /**
 221          * Usually aborts on failure
 222          * If the failFunction is set to a non-zero integer, returns success
 223          */
 224         function open( $server, $user, $password, $dbName ) {
 225                 if ( !function_exists( 'oci_connect' ) ) {
 226                         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" );
 227                 }
 228
 229                 $this->close();
 230                 $this->mServer = $server;
 231                 $this->mUser = $user;
 232                 $this->mPassword = $password;
 233                 $this->mDBname = $dbName;
 234
 235                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 236                         return;
 237                 }
 238
 239                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 240                 if ( $this->mFlags & DBO_DEFAULT ) {
 241                         $this->mConn = oci_new_connect( $user, $password, $dbName, $this->defaultCharset, $session_mode );
 242                 } else {
 243                         $this->mConn = oci_connect( $user, $password, $dbName, $this->defaultCharset, $session_mode );
 244                 }
 245
 246                 if ( $this->mConn == false ) {
 247                         wfDebug( "DB connection error\n" );
 248                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 249                         wfDebug( $this->lastError() . "\n" );
 250                         return false;
 251                 }
 252
 253                 $this->mOpened = true;
 254
 255                 # removed putenv calls because they interfere with the system globaly
 256                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 257                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 258                 return $this->mConn;
 259         }
 260
 261         /**
 262          * Closes a database connection, if it is open
 263          * Returns success, true if already closed
 264          */
 265         function close() {
 266                 $this->mOpened = false;
 267                 if ( $this->mConn ) {
 268                         return oci_close( $this->mConn );
 269                 } else {
 270                         return true;
 271                 }
 272         }
 273
 274         function execFlags() {
 275                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 276         }
 277
 278         function doQuery( $sql ) {
 279                 wfDebug( "SQL: [$sql]\n" );
 280                 if ( !mb_check_encoding( $sql ) ) {
 281                         throw new MWException( "SQL encoding is invalid\n$sql" );
 282                 }
 283
 284                 // handle some oracle specifics
 285                 // remove AS column/table/subquery namings
 286                 if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
 287                         $sql = preg_replace( '/ as /i', ' ', $sql );
 288                 }
 289                 // Oracle has issues with UNION clause if the statement includes LOB fields
 290                 // So we do a UNION ALL and then filter the results array with array_unique
 291                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 292                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 293                 // you have to select data from plan table after explain
 294                 $olderr = error_reporting( E_ERROR );
 295                 $explain_id = date( 'dmYHis' );
 296                 error_reporting( $olderr );
 297
 298                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 299
 300
 301                 $olderr = error_reporting( E_ERROR );
 302
 303                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 304                         $e = oci_error( $this->mConn );
 305                         $this->reportQueryError( $e['message'], $e['code'], $sql, __FUNCTION__ );
 306                 }
 307
 308                 $olderr = error_reporting( E_ERROR );
 309                 if ( oci_execute( $stmt, $this->execFlags() ) == false ) {
 310                         $e = oci_error( $stmt );
 311                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 312                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __FUNCTION__ );
 313                         }
 314                 }
 315                 error_reporting( $olderr );
 316
 317                 if ( $explain_count > 0 ) {
 318                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 319                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 320                         return new ORAResult( $this, $stmt, $union_unique );
 321                 } else {
 322                         $this->mAffectedRows = oci_num_rows( $stmt );
 323                         return true;
 324                 }
 325         }
 326
 327         function queryIgnore( $sql, $fname = '' ) {
 328                 return $this->query( $sql, $fname, true );
 329         }
 330
 331         function freeResult( $res ) {
 332                 if ( $res instanceof ORAResult ) {
 333                         $res->free();
 334                 } else {
 335                         $res->result->free();
 336                 }
 337         }
 338
 339         function fetchObject( $res ) {
 340                 if ( $res instanceof ORAResult ) {
 341                         return $res->numRows();
 342                 } else {
 343                         return $res->result->fetchObject();
 344                 }
 345         }
 346
 347         function fetchRow( $res ) {
 348                 if ( $res instanceof ORAResult ) {
 349                         return $res->fetchRow();
 350                 } else {
 351                         return $res->result->fetchRow();
 352                 }
 353         }
 354
 355         function numRows( $res ) {
 356                 if ( $res instanceof ORAResult ) {
 357                         return $res->numRows();
 358                 } else {
 359                         return $res->result->numRows();
 360                 }
 361         }
 362
 363         function numFields( $res ) {
 364                 if ( $res instanceof ORAResult ) {
 365                         return $res->numFields();
 366                 } else {
 367                         return $res->result->numFields();
 368                 }
 369         }
 370
 371         function fieldName( $stmt, $n ) {
 372                 return oci_field_name( $stmt, $n );
 373         }
 374
 375         /**
 376          * This must be called after nextSequenceVal
 377          */
 378         function insertId() {
 379                 return $this->mInsertId;
 380         }
 381
 382         function dataSeek( $res, $row ) {
 383                 if ( $res instanceof ORAResult ) {
 384                         $res->seek( $row );
 385                 } else {
 386                         $res->result->seek( $row );
 387                 }
 388         }
 389
 390         function lastError() {
 391                 if ( $this->mConn === false ) {
 392                         $e = oci_error();
 393                 } else {
 394                         $e = oci_error( $this->mConn );
 395                 }
 396                 return $e['message'];
 397         }
 398
 399         function lastErrno() {
 400                 if ( $this->mConn === false ) {
 401                         $e = oci_error();
 402                 } else {
 403                         $e = oci_error( $this->mConn );
 404                 }
 405                 return $e['code'];
 406         }
 407
 408         function affectedRows() {
 409                 return $this->mAffectedRows;
 410         }
 411
 412         /**
 413          * Returns information about an index
 414          * If errors are explicitly ignored, returns NULL on failure
 415          */
 416         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 417                 return false;
 418         }
 419
 420         function indexUnique( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 421                 return false;
 422         }
 423
 424         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 425                 if ( !count( $a ) ) {
 426                         return true;
 427                 }
 428
 429                 if ( !is_array( $options ) ) {
 430                         $options = array( $options );
 431                 }
 432
 433                 if ( in_array( 'IGNORE', $options ) ) {
 434                         $this->ignore_DUP_VAL_ON_INDEX = true;
 435                 }
 436
 437                 if ( !is_array( reset( $a ) ) ) {
 438                         $a = array( $a );
 439                 }
 440
 441                 foreach ( $a as &$row ) {
 442                         $this->insertOneRow( $table, $row, $fname );
 443                 }
 444                 $retVal = true;
 445
 446                 if ( in_array( 'IGNORE', $options ) ) {
 447                         $this->ignore_DUP_VAL_ON_INDEX = false;
 448                 }
 449
 450                 return $retVal;
 451         }
 452
 453         function insertOneRow( $table, $row, $fname ) {
 454                 global $wgLang;
 455
 456                 // "INSERT INTO tables (a, b, c)"
 457                 $sql = "INSERT INTO " . $this->tableName( $table ) . " (" . join( ',', array_keys( $row ) ) . ')';
 458                 $sql .= " VALUES (";
 459
 460                 // for each value, append ":key"
 461                 $first = true;
 462                 foreach ( $row as $col => $val ) {
 463                         if ( $first ) {
 464                                 $sql .= $val !== null ? ':' . $col : 'NULL';
 465                         } else {
 466                                 $sql .= $val !== null ? ', :' . $col : ', NULL';
 467                         }
 468
 469                         $first = false;
 470                 }
 471                 $sql .= ')';
 472
 473                 $stmt = oci_parse( $this->mConn, $sql );
 474                 foreach ( $row as $col => &$val ) {
 475                         $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
 476
 477                         if ( $val === null ) {
 478                                 // do nothing ... null was inserted in statement creation
 479                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 480                                 if ( is_object( $val ) ) {
 481                                         $val = $val->getData();
 482                                 }
 483
 484                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 485                                         $val = '31-12-2030 12:00:00.000000';
 486                                 }
 487
 488                                 $val = ( $wgLang != null ) ? $wgLang->checkTitleEncoding( $val ) : $val;
 489                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
 490                                         $this->reportQueryError( $this->lastErrno(), $this->lastError(), $sql, __METHOD__ );
 491                                 }
 492                         } else {
 493                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 494                                         $e = oci_error( $stmt );
 495                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 496                                 }
 497
 498                                 if ( $col_type == 'BLOB' ) { // is_object($val)) {
 499                                         $lob[$col]->writeTemporary( $val ); // ->getData());
 500                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
 501                                 } else {
 502                                         $lob[$col]->writeTemporary( $val );
 503                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 504                                 }
 505                         }
 506                 }
 507
 508                 $olderr = error_reporting( E_ERROR );
 509                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
 510                         $e = oci_error( $stmt );
 511
 512                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 513                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 514                         } else {
 515                                 $this->mAffectedRows = oci_num_rows( $stmt );
 516                         }
 517                 } else {
 518                         $this->mAffectedRows = oci_num_rows( $stmt );
 519                 }
 520                 error_reporting( $olderr );
 521
 522                 if ( isset( $lob ) ) {
 523                         foreach ( $lob as $lob_i => $lob_v ) {
 524                                 $lob_v->free();
 525                         }
 526                 }
 527
 528                 if ( !$this->mTrxLevel ) {
 529                         oci_commit( $this->mConn );
 530                 }
 531
 532                 oci_free_statement( $stmt );
 533         }
 534
 535         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 536                 $insertOptions = array(), $selectOptions = array() )
 537         {
 538                 $destTable = $this->tableName( $destTable );
 539                 if ( !is_array( $selectOptions ) ) {
 540                         $selectOptions = array( $selectOptions );
 541                 }
 542                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 543                 if ( is_array( $srcTable ) ) {
 544                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 545                 } else {
 546                         $srcTable = $this->tableName( $srcTable );
 547                 }
 548
 549                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 550                                 !isset( $varMap[$sequenceData['column']] ) )
 551                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 552
 553                 // count-alias subselect fields to avoid abigious definition errors
 554                 $i = 0;
 555                 foreach ( $varMap as $key => &$val ) {
 556                         $val = $val . ' field' . ( $i++ );
 557                 }
 558
 559                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 560                         " SELECT $startOpts " . implode( ',', $varMap ) .
 561                         " FROM $srcTable $useIndex ";
 562                 if ( $conds != '*' ) {
 563                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 564                 }
 565                 $sql .= " $tailOpts";
 566
 567                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 568                         $this->ignore_DUP_VAL_ON_INDEX = true;
 569                 }
 570
 571                 $retval = $this->query( $sql, $fname );
 572
 573                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 574                         $this->ignore_DUP_VAL_ON_INDEX = false;
 575                 }
 576
 577                 return $retval;
 578         }
 579
 580         function tableName( $name ) {
 581                 global $wgSharedDB, $wgSharedPrefix, $wgSharedTables;
 582                 /*
 583                 Replace reserved words with better ones
 584                 Using uppercase because that's the only way Oracle can handle
 585                 quoted tablenames
 586                 */
 587                 switch( $name ) {
 588                         case 'user':
 589                                 $name = 'MWUSER';
 590                                 break;
 591                         case 'text':
 592                                 $name = 'PAGECONTENT';
 593                                 break;
 594                 }
 595
 596                 /*
 597                         The rest of procedure is equal to generic Databse class
 598                         except for the quoting style
 599                 */
 600                 if ( $name[0] == '"' && substr( $name, - 1, 1 ) == '"' ) {
 601                         return $name;
 602                 }
 603
 604                 if ( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) {
 605                         return $name;
 606                 }
 607                 $dbDetails = array_reverse( explode( '.', $name, 2 ) );
 608                 if ( isset( $dbDetails[1] ) ) {
 609                         @list( $table, $database ) = $dbDetails;
 610                 } else {
 611                         @list( $table ) = $dbDetails;
 612                 }
 613
 614                 $prefix = $this->mTablePrefix;
 615
 616                 if ( isset( $database ) ) {
 617                         $table = ( $table[0] == '`' ? $table : "`{$table}`" );
 618                 }
 619
 620                 if ( !isset( $database ) && isset( $wgSharedDB ) && $table[0] != '"'
 621                         && isset( $wgSharedTables )
 622                         && is_array( $wgSharedTables )
 623                         && in_array( $table, $wgSharedTables )
 624                 ) {
 625                         $database = $wgSharedDB;
 626                         $prefix   = isset( $wgSharedPrefix ) ? $wgSharedPrefix : $prefix;
 627                 }
 628
 629                 if ( isset( $database ) ) {
 630                         $database = ( $database[0] == '"' ? $database : "\"{$database}\"" );
 631                 }
 632                 $table = ( $table[0] == '"' ? $table : "\"{$prefix}{$table}\"" );
 633
 634                 $tableName = ( isset( $database ) ? "{$database}.{$table}" : "{$table}" );
 635
 636                 return strtoupper( $tableName );
 637         }
 638
 639         /**
 640          * Return the next in a sequence, save the value for retrieval via insertId()
 641          */
 642         function nextSequenceValue( $seqName ) {
 643                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 644                 $row = $this->fetchRow( $res );
 645                 $this->mInsertId = $row[0];
 646                 $this->freeResult( $res );
 647                 return $this->mInsertId;
 648         }
 649
 650         /**
 651          * Return sequence_name if table has a sequence
 652          */
 653         function getSequenceData( $table ) {
 654                 if ( $this->sequenceData == null ) {
 655                         $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'" );
 656
 657                         while ( ( $row = $result->fetchRow() ) !== false ) {
 658                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 659                                         'sequence' => $row[0],
 660                                         'column' => $row[2]
 661                                 );
 662                         }
 663                 }
 664
 665                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 666         }
 667
 668         # REPLACE query wrapper
 669         # Oracle simulates this with a DELETE followed by INSERT
 670         # $row is the row to insert, an associative array
 671         # $uniqueIndexes is an array of indexes. Each element may be either a
 672         # field name or an array of field names
 673         #
 674         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 675         # However if you do this, you run the risk of encountering errors which wouldn't have
 676         # occurred in MySQL
 677         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 678                 $table = $this->tableName( $table );
 679
 680                 if ( count( $rows ) == 0 ) {
 681                         return;
 682                 }
 683
 684                 # Single row case
 685                 if ( !is_array( reset( $rows ) ) ) {
 686                         $rows = array( $rows );
 687                 }
 688
 689                 $sequenceData = $this->getSequenceData( $table );
 690
 691                 foreach ( $rows as $row ) {
 692                         # Delete rows which collide
 693                         if ( $uniqueIndexes ) {
 694                                 $condsDelete = array();
 695                                 foreach ( $uniqueIndexes as $index )
 696                                         $condsDelete[$index] = $row[$index];
 697                                 $this->delete( $table, $condsDelete, $fname );
 698 /*
 699                                 $sql = "DELETE FROM $table WHERE ";
 700                                 $first = true;
 701                                 foreach ( $uniqueIndexes as $index ) {
 702                                         if ( $first ) {
 703                                                 $first = false;
 704                                                 $sql .= "(";
 705                                         } else {
 706                                                 $sql .= ') OR (';
 707                                         }
 708                                         if ( is_array( $index ) ) {
 709                                                 $first2 = true;
 710                                                 foreach ( $index as $col ) {
 711                                                         if ( $first2 ) {
 712                                                                 $first2 = false;
 713                                                         } else {
 714                                                                 $sql .= ' AND ';
 715                                                         }
 716                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 717                                                 }
 718                                         } else {
 719                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 720                                         }
 721                                 }
 722                                 $sql .= ')';
 723
 724                                 $this->doQuery( $sql);//, $fname );
 725 */
 726                         }
 727
 728                         if ( $sequenceData !== false && !isset( $row[$sequenceData['column']] ) ) {
 729                                 $row[$sequenceData['column']] = $this->nextSequenceValue( $sequenceData['sequence'] );
 730                         }
 731
 732                         # Now insert the row
 733                         $this->insert( $table, $row, $fname );
 734                 }
 735         }
 736
 737         # DELETE where the condition is a join
 738         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "DatabaseOracle::deleteJoin" ) {
 739                 if ( !$conds ) {
 740                         throw new DBUnexpectedError( $this,  'DatabaseOracle::deleteJoin() called with empty $conds' );
 741                 }
 742
 743                 $delTable = $this->tableName( $delTable );
 744                 $joinTable = $this->tableName( $joinTable );
 745                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 746                 if ( $conds != '*' ) {
 747                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 748                 }
 749                 $sql .= ')';
 750
 751                 $this->query( $sql, $fname );
 752         }
 753
 754         # Returns the size of a text field, or -1 for "unlimited"
 755         function textFieldSize( $table, $field ) {
 756                 $table = $this->tableName( $table );
 757                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 758                         FROM pg_class c, pg_attribute a, pg_type t
 759                         WHERE relname='$table' AND a.attrelid=c.oid AND
 760                                 a.atttypid=t.oid and a.attname='$field'";
 761                 $res = $this->query( $sql );
 762                 $row = $this->fetchObject( $res );
 763                 if ( $row->ftype == "varchar" ) {
 764                         $size = $row->size - 4;
 765                 } else {
 766                         $size = $row->size;
 767                 }
 768                 $this->freeResult( $res );
 769                 return $size;
 770         }
 771
 772         function limitResult( $sql, $limit, $offset = false ) {
 773                 if ( $offset === false ) {
 774                         $offset = 0;
 775                 }
 776                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 777         }
 778
 779
 780         function unionQueries( $sqls, $all ) {
 781                 $glue = ' UNION ALL ';
 782                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 783         }
 784
 785         function wasDeadlock() {
 786                 return $this->lastErrno() == 'OCI-00060';
 787         }
 788
 789
 790         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 791                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 792                 return $this->query( 'BEGIN DUPLICATE_TABLE(\'' . $oldName . '\', \'' . $newName . '\', ' . $temporary . '); END;', $fname );
 793         }
 794
 795         function timestamp( $ts = 0 ) {
 796                 return wfTimestamp( TS_ORACLE, $ts );
 797         }
 798
 799         /**
 800          * Return aggregated value function call
 801          */
 802         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 803                 return $valuedata;
 804         }
 805
 806         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 807                 # Ignore errors during error handling to avoid infinite
 808                 # recursion
 809                 $ignore = $this->ignoreErrors( true );
 810                 ++$this->mErrorCount;
 811
 812                 if ( $ignore || $tempIgnore ) {
 813                         wfDebug( "SQL ERROR (ignored): $error\n" );
 814                         $this->ignoreErrors( $ignore );
 815                 } else {
 816                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 817                 }
 818         }
 819
 820         /**
 821          * @return string wikitext of a link to the server software's web site
 822          */
 823         function getSoftwareLink() {
 824                 return '[http://www.oracle.com/ Oracle]';
 825         }
 826
 827         /**
 828          * @return string Version information from the database
 829          */
 830         function getServerVersion() {
 831                 return oci_server_version( $this->mConn );
 832         }
 833
 834         /**
 835          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 836          */
 837         function tableExists( $table ) {
 838                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 839                 $res = $this->doQuery( $SQL );
 840                 if ( $res ) {
 841                         $count = $res->numRows();
 842                         $res->free();
 843                 } else {
 844                         $count = 0;
 845                 }
 846                 return $count;
 847         }
 848
 849         /**
 850          * Query whether a given column exists in the mediawiki schema
 851          * based on prebuilt table to simulate MySQL field info and keep query speed minimal
 852          */
 853         function fieldExists( $table, $field, $fname = 'DatabaseOracle::fieldExists' ) {
 854                 if ( !isset( $this->fieldInfo_stmt ) ) {
 855                         $this->fieldInfo_stmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)' );
 856                 }
 857
 858                 oci_bind_by_name( $this->fieldInfo_stmt, ':tab', trim( $table, '"' ) );
 859                 oci_bind_by_name( $this->fieldInfo_stmt, ':col', $field );
 860
 861                 if ( oci_execute( $this->fieldInfo_stmt, OCI_DEFAULT ) === false ) {
 862                         $e = oci_error( $this->fieldInfo_stmt );
 863                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 864                         return false;
 865                 }
 866                 $res = new ORAResult( $this, $this->fieldInfo_stmt );
 867                 return $res->numRows() != 0;
 868         }
 869
 870         function fieldInfo( $table, $field ) {
 871                 if ( !isset( $this->fieldInfo_stmt ) ) {
 872                         $this->fieldInfo_stmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)' );
 873                 }
 874
 875                 $table = trim( $table, '"' );
 876                 oci_bind_by_name( $this->fieldInfo_stmt, ':tab', $table );
 877                 oci_bind_by_name( $this->fieldInfo_stmt, ':col', $field );
 878
 879                 if ( oci_execute( $this->fieldInfo_stmt, OCI_DEFAULT ) === false ) {
 880                         $e = oci_error( $this->fieldInfo_stmt );
 881                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 882                         return false;
 883                 }
 884                 $res = new ORAResult( $this, $this->fieldInfo_stmt );
 885                 return new ORAField( $res->fetchRow() );
 886         }
 887
 888         function begin( $fname = '' ) {
 889                 $this->mTrxLevel = 1;
 890         }
 891
 892         function immediateCommit( $fname = '' ) {
 893                 return true;
 894         }
 895
 896         function commit( $fname = '' ) {
 897                 oci_commit( $this->mConn );
 898                 $this->mTrxLevel = 0;
 899         }
 900
 901         /* Not even sure why this is used in the main codebase... */
 902         function limitResultForUpdate( $sql, $num ) {
 903                 return $sql;
 904         }
 905
 906         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 907         function sourceStream( $fp, $lineCallback = false, $resultCallback = false ) {
 908                 $cmd = '';
 909                 $done = false;
 910                 $dollarquote = false;
 911
 912                 $replacements = array();
 913
 914                 while ( ! feof( $fp ) ) {
 915                         if ( $lineCallback ) {
 916                                 call_user_func( $lineCallback );
 917                         }
 918                         $line = trim( fgets( $fp, 1024 ) );
 919                         $sl = strlen( $line ) - 1;
 920
 921                         if ( $sl < 0 ) {
 922                                 continue;
 923                         }
 924                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
 925                                 continue;
 926                         }
 927
 928                         // Allow dollar quoting for function declarations
 929                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 930                                 if ( $dollarquote ) {
 931                                         $dollarquote = false;
 932                                         $done = true;
 933                                 } else {
 934                                         $dollarquote = true;
 935                                 }
 936                         } elseif ( !$dollarquote ) {
 937                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
 938                                         $done = true;
 939                                         $line = substr( $line, 0, $sl );
 940                                 }
 941                         }
 942
 943                         if ( '' != $cmd ) {
 944                                 $cmd .= ' ';
 945                         }
 946                         $cmd .= "$line\n";
 947
 948                         if ( $done ) {
 949                                 $cmd = str_replace( ';;', ";", $cmd );
 950                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
 951                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
 952                                                 $replacements[$defines[2]] = $defines[1];
 953                                         }
 954                                 } else {
 955                                         foreach ( $replacements as $mwVar => $scVar ) {
 956                                                 $cmd = str_replace( '&' . $scVar . '.', '{$' . $mwVar . '}', $cmd );
 957                                         }
 958
 959                                         $cmd = $this->replaceVars( $cmd );
 960                                         $res = $this->query( $cmd, __METHOD__ );
 961                                         if ( $resultCallback ) {
 962                                                 call_user_func( $resultCallback, $res, $this );
 963                                         }
 964
 965                                         if ( false === $res ) {
 966                                                 $err = $this->lastError();
 967                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
 968                                         }
 969                                 }
 970
 971                                 $cmd = '';
 972                                 $done = false;
 973                         }
 974                 }
 975                 return true;
 976         }
 977
 978         function setup_database() {
 979                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
 980
 981                 echo "<li>Creating DB objects</li>\n";
 982                 $res = $this->sourceFile( "../maintenance/ora/tables.sql" );
 983
 984                 // Avoid the non-standard "REPLACE INTO" syntax
 985                 echo "<li>Populating table interwiki</li>\n";
 986                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
 987                 if ( $f == false ) {
 988                         dieout( "<li>Could not find the interwiki.sql file</li>" );
 989                 }
 990
 991                 // do it like the postgres :D
 992                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
 993                 while ( !feof( $f ) ) {
 994                         $line = fgets( $f, 1024 );
 995                         $matches = array();
 996                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) {
 997                                 continue;
 998                         }
 999                         $this->query( "$SQL $matches[1],$matches[2])" );
1000                 }
1001
1002                 echo "<li>Table interwiki successfully populated</li>\n";
1003         }
1004
1005         function strencode( $s ) {
1006                 return str_replace( "'", "''", $s );
1007         }
1008
1009 /*
1010         function encodeBlob($b) {
1011                 return $b; //new ORABlob($b);
1012         }
1013         function decodeBlob($b) {
1014                 return $b; //return $b->load();
1015         }
1016 */
1017         function addQuotes( $s ) {
1018                 global $wgLang;
1019                 if ( isset( $wgLang->mLoaded ) && $wgLang->mLoaded ) {
1020                         $s = $wgLang->checkTitleEncoding( $s );
1021                 }
1022                 return "'" . $this->strencode( $s ) . "'";
1023         }
1024
1025         function quote_ident( $s ) {
1026                 return $s;
1027         }
1028
1029         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1030                 global $wgLang;
1031
1032                 $conds2 = array();
1033                 foreach ( $conds as $col => $val ) {
1034                         $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
1035                         if ( $col_type == 'CLOB' ) {
1036                                 $conds2['TO_CHAR(' . $col . ')'] = $wgLang->checkTitleEncoding( $val );
1037                         } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1038                                 $conds2[$col] = $wgLang->checkTitleEncoding( $val );
1039                         } else {
1040                                 $conds2[$col] = $val;
1041                         }
1042                 }
1043
1044                 if ( is_array( $table ) ) {
1045                         foreach ( $table as $tab ) {
1046                                 $tab = $this->tableName( $tab );
1047                         }
1048                 } else {
1049                         $table = $this->tableName( $table );
1050                 }
1051
1052                 return parent::selectRow( $table, $vars, $conds2, $fname, $options, $join_conds );
1053         }
1054
1055         /**
1056          * Returns an optional USE INDEX clause to go after the table, and a
1057          * string to go at the end of the query
1058          *
1059          * @private
1060          *
1061          * @param $options Array: an associative array of options to be turned into
1062          *              an SQL query, valid keys are listed in the function.
1063          * @return array
1064          */
1065         function makeSelectOptions( $options ) {
1066                 $preLimitTail = $postLimitTail = '';
1067                 $startOpts = '';
1068
1069                 $noKeyOptions = array();
1070                 foreach ( $options as $key => $option ) {
1071                         if ( is_numeric( $key ) ) {
1072                                 $noKeyOptions[$option] = true;
1073                         }
1074                 }
1075
1076                 if ( isset( $options['GROUP BY'] ) ) {
1077                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1078                 }
1079                 if ( isset( $options['ORDER BY'] ) ) {
1080                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1081                 }
1082
1083                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1084                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1085                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1086                         $startOpts .= 'DISTINCT';
1087                 }
1088
1089                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1090                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1091                 } else {
1092                         $useIndex = '';
1093                 }
1094
1095                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1096         }
1097
1098         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1099                 global $wgLang;
1100
1101                 if ( $wgLang != null ) {
1102                         $conds2 = array();
1103                         foreach ( $conds as $col => $val ) {
1104                                 $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
1105                                 if ( $col_type == 'CLOB' ) {
1106                                         $conds2['TO_CHAR(' . $col . ')'] = $wgLang->checkTitleEncoding( $val );
1107                                 } else {
1108                                         if ( is_array( $val ) ) {
1109                                                 $conds2[$col] = $val;
1110                                                 foreach ( $conds2[$col] as &$val2 ) {
1111                                                         $val2 = $wgLang->checkTitleEncoding( $val2 );
1112                                                 }
1113                                         } else {
1114                                                 $conds2[$col] = $wgLang->checkTitleEncoding( $val );
1115                                         }
1116                                 }
1117                         }
1118
1119                         return parent::delete( $table, $conds2, $fname );
1120                 } else {
1121                         return parent::delete( $table, $conds, $fname );
1122                 }
1123         }
1124
1125         function bitNot( $field ) {
1126                 // expecting bit-fields smaller than 4bytes
1127                 return 'BITNOT(' . $bitField . ')';
1128         }
1129
1130         function bitAnd( $fieldLeft, $fieldRight ) {
1131                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1132         }
1133
1134         function bitOr( $fieldLeft, $fieldRight ) {
1135                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1136         }
1137
1138         /**
1139          * How lagged is this slave?
1140          *
1141          * @return int
1142          */
1143         public function getLag() {
1144                 # Not implemented for Oracle
1145                 return 0;
1146         }
1147
1148         function setFakeSlaveLag( $lag ) { }
1149         function setFakeMaster( $enabled = true ) { }
1150
1151         function getDBname() {
1152                 return $this->mDBname;
1153         }
1154
1155         function getServer() {
1156                 return $this->mServer;
1157         }
1158
1159         public function replaceVars( $ins ) {
1160                 $varnames = array( 'wgDBprefix' );
1161                 if ( $this->mFlags & DBO_SYSDBA ) {
1162                         $varnames[] = 'wgDBOracleDefTS';
1163                         $varnames[] = 'wgDBOracleTempTS';
1164                 }
1165
1166                 // Ordinary variables
1167                 foreach ( $varnames as $var ) {
1168                         if ( isset( $GLOBALS[$var] ) ) {
1169                                 $val = addslashes( $GLOBALS[$var] ); // FIXME: safety check?
1170                                 $ins = str_replace( '{$' . $var . '}', $val, $ins );
1171                                 $ins = str_replace( '/*$' . $var . '*/`', '`' . $val, $ins );
1172                                 $ins = str_replace( '/*$' . $var . '*/', $val, $ins );
1173                         }
1174                 }
1175
1176                 return parent::replaceVars( $ins );
1177         }
1178
1179         public function getSearchEngine() {
1180                 return 'SearchOracle';
1181         }
1182 } // end DatabaseOracle class