includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 use Wikimedia\Rdbms\Database;
  25 use Wikimedia\Rdbms\Blob;
  26 use Wikimedia\Rdbms\ResultWrapper;
  27 use Wikimedia\Rdbms\DBConnectionError;
  28 use Wikimedia\Rdbms\DBUnexpectedError;
  29
  30 /**
  31  * @ingroup Database
  32  */
  33 class DatabaseOracle extends Database {
  34         /** @var resource */
  35         protected $mLastResult = null;
  36
  37         /** @var int The number of rows affected as an integer */
  38         protected $mAffectedRows;
  39
  40         /** @var bool */
  41         private $ignoreDupValOnIndex = false;
  42
  43         /** @var bool|array */
  44         private $sequenceData = null;
  45
  46         /** @var string Character set for Oracle database */
  47         private $defaultCharset = 'AL32UTF8';
  48
  49         /** @var array */
  50         private $mFieldInfoCache = [];
  51
  52         function __construct( array $p ) {
  53                 global $wgDBprefix;
  54
  55                 if ( $p['tablePrefix'] == 'get from global' ) {
  56                         $p['tablePrefix'] = $wgDBprefix;
  57                 }
  58                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  59                 parent::__construct( $p );
  60                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  61         }
  62
  63         function __destruct() {
  64                 if ( $this->opened ) {
  65                         Wikimedia\suppressWarnings();
  66                         $this->close();
  67                         Wikimedia\restoreWarnings();
  68                 }
  69         }
  70
  71         function getType() {
  72                 return 'oracle';
  73         }
  74
  75         function implicitGroupby() {
  76                 return false;
  77         }
  78
  79         function implicitOrderby() {
  80                 return false;
  81         }
  82
  83         /**
  84          * Usually aborts on failure
  85          * @param string $server
  86          * @param string $user
  87          * @param string $password
  88          * @param string $dbName
  89          * @throws DBConnectionError
  90          * @return resource|null
  91          */
  92         function open( $server, $user, $password, $dbName ) {
  93                 global $wgDBOracleDRCP;
  94                 if ( !function_exists( 'oci_connect' ) ) {
  95                         throw new DBConnectionError(
  96                                 $this,
  97                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  98                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  99                                         "and database)\n" );
 100                 }
 101
 102                 $this->close();
 103                 $this->user = $user;
 104                 $this->password = $password;
 105                 // changed internal variables functions
 106                 // mServer now holds the TNS endpoint
 107                 // mDBname is schema name if different from username
 108                 if ( !$server ) {
 109                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 110                         $this->server = $dbName;
 111                         $this->dbName = $user;
 112                 } else {
 113                         $this->server = $server;
 114                         if ( !$dbName ) {
 115                                 $this->dbName = $user;
 116                         } else {
 117                                 $this->dbName = $dbName;
 118                         }
 119                 }
 120
 121                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 122                         return null;
 123                 }
 124
 125                 if ( $wgDBOracleDRCP ) {
 126                         $this->setFlag( DBO_PERSISTENT );
 127                 }
 128
 129                 $session_mode = $this->flags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 130
 131                 Wikimedia\suppressWarnings();
 132                 if ( $this->flags & DBO_PERSISTENT ) {
 133                         $this->conn = oci_pconnect(
 134                                 $this->user,
 135                                 $this->password,
 136                                 $this->server,
 137                                 $this->defaultCharset,
 138                                 $session_mode
 139                         );
 140                 } elseif ( $this->flags & DBO_DEFAULT ) {
 141                         $this->conn = oci_new_connect(
 142                                 $this->user,
 143                                 $this->password,
 144                                 $this->server,
 145                                 $this->defaultCharset,
 146                                 $session_mode
 147                         );
 148                 } else {
 149                         $this->conn = oci_connect(
 150                                 $this->user,
 151                                 $this->password,
 152                                 $this->server,
 153                                 $this->defaultCharset,
 154                                 $session_mode
 155                         );
 156                 }
 157                 Wikimedia\restoreWarnings();
 158
 159                 if ( $this->user != $this->dbName ) {
 160                         // change current schema in session
 161                         $this->selectDB( $this->dbName );
 162                 }
 163
 164                 if ( !$this->conn ) {
 165                         throw new DBConnectionError( $this, $this->lastError() );
 166                 }
 167
 168                 $this->opened = true;
 169
 170                 # removed putenv calls because they interfere with the system globaly
 171                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 172                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 173                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 174
 175                 return $this->conn;
 176         }
 177
 178         /**
 179          * Closes a database connection, if it is open
 180          * Returns success, true if already closed
 181          * @return bool
 182          */
 183         protected function closeConnection() {
 184                 return oci_close( $this->conn );
 185         }
 186
 187         function execFlags() {
 188                 return $this->trxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 189         }
 190
 191         protected function doQuery( $sql ) {
 192                 wfDebug( "SQL: [$sql]\n" );
 193                 if ( !StringUtils::isUtf8( $sql ) ) {
 194                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 195                 }
 196
 197                 // handle some oracle specifics
 198                 // remove AS column/table/subquery namings
 199                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 200                         $sql = preg_replace( '/ as /i', ' ', $sql );
 201                 }
 202
 203                 // Oracle has issues with UNION clause if the statement includes LOB fields
 204                 // So we do a UNION ALL and then filter the results array with array_unique
 205                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 206                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 207                 // you have to select data from plan table after explain
 208                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 209
 210                 $sql = preg_replace(
 211                         '/^EXPLAIN /',
 212                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 213                         $sql,
 214                         1,
 215                         $explain_count
 216                 );
 217
 218                 Wikimedia\suppressWarnings();
 219
 220                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 221                 if ( $stmt === false ) {
 222                         $e = oci_error( $this->conn );
 223                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 224
 225                         return false;
 226                 }
 227
 228                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 229                         $e = oci_error( $stmt );
 230                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 231                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 232
 233                                 return false;
 234                         }
 235                 }
 236
 237                 Wikimedia\restoreWarnings();
 238
 239                 if ( $explain_count > 0 ) {
 240                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 241                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 242                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 243                         return new ORAResult( $this, $stmt, $union_unique );
 244                 } else {
 245                         $this->mAffectedRows = oci_num_rows( $stmt );
 246
 247                         return true;
 248                 }
 249         }
 250
 251         function queryIgnore( $sql, $fname = '' ) {
 252                 return $this->query( $sql, $fname, true );
 253         }
 254
 255         /**
 256          * Frees resources associated with the LOB descriptor
 257          * @param ResultWrapper|ORAResult $res
 258          */
 259         function freeResult( $res ) {
 260                 if ( $res instanceof ResultWrapper ) {
 261                         $res = $res->result;
 262                 }
 263
 264                 $res->free();
 265         }
 266
 267         /**
 268          * @param ResultWrapper|ORAResult $res
 269          * @return mixed
 270          */
 271         function fetchObject( $res ) {
 272                 if ( $res instanceof ResultWrapper ) {
 273                         $res = $res->result;
 274                 }
 275
 276                 return $res->fetchObject();
 277         }
 278
 279         /**
 280          * @param ResultWrapper|ORAResult $res
 281          * @return mixed
 282          */
 283         function fetchRow( $res ) {
 284                 if ( $res instanceof ResultWrapper ) {
 285                         $res = $res->result;
 286                 }
 287
 288                 return $res->fetchRow();
 289         }
 290
 291         /**
 292          * @param ResultWrapper|ORAResult $res
 293          * @return int
 294          */
 295         function numRows( $res ) {
 296                 if ( $res instanceof ResultWrapper ) {
 297                         $res = $res->result;
 298                 }
 299
 300                 return $res->numRows();
 301         }
 302
 303         /**
 304          * @param ResultWrapper|ORAResult $res
 305          * @return int
 306          */
 307         function numFields( $res ) {
 308                 if ( $res instanceof ResultWrapper ) {
 309                         $res = $res->result;
 310                 }
 311
 312                 return $res->numFields();
 313         }
 314
 315         function fieldName( $stmt, $n ) {
 316                 return oci_field_name( $stmt, $n );
 317         }
 318
 319         function insertId() {
 320                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 321                 $row = $this->fetchRow( $res );
 322                 return is_null( $row[0] ) ? null : (int)$row[0];
 323         }
 324
 325         /**
 326          * @param mixed $res
 327          * @param int $row
 328          */
 329         function dataSeek( $res, $row ) {
 330                 if ( $res instanceof ORAResult ) {
 331                         $res->seek( $row );
 332                 } else {
 333                         $res->result->seek( $row );
 334                 }
 335         }
 336
 337         function lastError() {
 338                 if ( $this->conn === false ) {
 339                         $e = oci_error();
 340                 } else {
 341                         $e = oci_error( $this->conn );
 342                 }
 343
 344                 return $e['message'];
 345         }
 346
 347         function lastErrno() {
 348                 if ( $this->conn === false ) {
 349                         $e = oci_error();
 350                 } else {
 351                         $e = oci_error( $this->conn );
 352                 }
 353
 354                 return $e['code'];
 355         }
 356
 357         protected function fetchAffectedRowCount() {
 358                 return $this->mAffectedRows;
 359         }
 360
 361         /**
 362          * Returns information about an index
 363          * If errors are explicitly ignored, returns NULL on failure
 364          * @param string $table
 365          * @param string $index
 366          * @param string $fname
 367          * @return bool
 368          */
 369         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 370                 return false;
 371         }
 372
 373         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 374                 return false;
 375         }
 376
 377         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 378                 if ( !count( $a ) ) {
 379                         return true;
 380                 }
 381
 382                 if ( !is_array( $options ) ) {
 383                         $options = [ $options ];
 384                 }
 385
 386                 if ( in_array( 'IGNORE', $options ) ) {
 387                         $this->ignoreDupValOnIndex = true;
 388                 }
 389
 390                 if ( !is_array( reset( $a ) ) ) {
 391                         $a = [ $a ];
 392                 }
 393
 394                 foreach ( $a as &$row ) {
 395                         $this->insertOneRow( $table, $row, $fname );
 396                 }
 397                 $retVal = true;
 398
 399                 if ( in_array( 'IGNORE', $options ) ) {
 400                         $this->ignoreDupValOnIndex = false;
 401                 }
 402
 403                 return $retVal;
 404         }
 405
 406         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 407                 $col_info = $this->fieldInfoMulti( $table, $col );
 408                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 409
 410                 $bind = '';
 411                 if ( is_numeric( $col ) ) {
 412                         $bind = $val;
 413                         $val = null;
 414
 415                         return $bind;
 416                 } elseif ( $includeCol ) {
 417                         $bind = "$col = ";
 418                 }
 419
 420                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 421                         $val = null;
 422                 }
 423
 424                 if ( $val === 'NULL' ) {
 425                         $val = null;
 426                 }
 427
 428                 if ( $val === null ) {
 429                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 430                                 $bind .= 'DEFAULT';
 431                         } else {
 432                                 $bind .= 'NULL';
 433                         }
 434                 } else {
 435                         $bind .= ':' . $col;
 436                 }
 437
 438                 return $bind;
 439         }
 440
 441         /**
 442          * @param string $table
 443          * @param array $row
 444          * @param string $fname
 445          * @return bool
 446          * @throws DBUnexpectedError
 447          */
 448         private function insertOneRow( $table, $row, $fname ) {
 449                 global $wgContLang;
 450
 451                 $table = $this->tableName( $table );
 452                 // "INSERT INTO tables (a, b, c)"
 453                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 454                 $sql .= " VALUES (";
 455
 456                 // for each value, append ":key"
 457                 $first = true;
 458                 foreach ( $row as $col => &$val ) {
 459                         if ( !$first ) {
 460                                 $sql .= ', ';
 461                         } else {
 462                                 $first = false;
 463                         }
 464                         if ( $this->isQuotedIdentifier( $val ) ) {
 465                                 $sql .= $this->removeIdentifierQuotes( $val );
 466                                 unset( $row[$col] );
 467                         } else {
 468                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 469                         }
 470                 }
 471                 $sql .= ')';
 472
 473                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 474                 if ( $stmt === false ) {
 475                         $e = oci_error( $this->conn );
 476                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 477
 478                         return false;
 479                 }
 480                 foreach ( $row as $col => &$val ) {
 481                         $col_info = $this->fieldInfoMulti( $table, $col );
 482                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 483
 484                         if ( $val === null ) {
 485                                 // do nothing ... null was inserted in statement creation
 486                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 487                                 if ( is_object( $val ) ) {
 488                                         $val = $val->fetch();
 489                                 }
 490
 491                                 // backward compatibility
 492                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 493                                         $val = $this->getInfinity();
 494                                 }
 495
 496                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 497                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 498                                         $e = oci_error( $stmt );
 499                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 500
 501                                         return false;
 502                                 }
 503                         } else {
 504                                 /** @var OCI_Lob[] $lob */
 505                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 506                                 if ( $lob[$col] === false ) {
 507                                         $e = oci_error( $stmt );
 508                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 509                                 }
 510
 511                                 if ( is_object( $val ) ) {
 512                                         $val = $val->fetch();
 513                                 }
 514
 515                                 if ( $col_type == 'BLOB' ) {
 516                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 517                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 518                                 } else {
 519                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 520                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 521                                 }
 522                         }
 523                 }
 524
 525                 Wikimedia\suppressWarnings();
 526
 527                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 528                         $e = oci_error( $stmt );
 529                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 530                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 531
 532                                 return false;
 533                         } else {
 534                                 $this->mAffectedRows = oci_num_rows( $stmt );
 535                         }
 536                 } else {
 537                         $this->mAffectedRows = oci_num_rows( $stmt );
 538                 }
 539
 540                 Wikimedia\restoreWarnings();
 541
 542                 if ( isset( $lob ) ) {
 543                         foreach ( $lob as $lob_v ) {
 544                                 $lob_v->free();
 545                         }
 546                 }
 547
 548                 if ( !$this->trxLevel ) {
 549                         oci_commit( $this->conn );
 550                 }
 551
 552                 return oci_free_statement( $stmt );
 553         }
 554
 555         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 556                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 557         ) {
 558                 $destTable = $this->tableName( $destTable );
 559
 560                 $sequenceData = $this->getSequenceData( $destTable );
 561                 if ( $sequenceData !== false &&
 562                         !isset( $varMap[$sequenceData['column']] )
 563                 ) {
 564                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 565                 }
 566
 567                 // count-alias subselect fields to avoid abigious definition errors
 568                 $i = 0;
 569                 foreach ( $varMap as &$val ) {
 570                         $val = $val . ' field' . ( $i++ );
 571                 }
 572
 573                 $selectSql = $this->selectSQLText(
 574                         $srcTable,
 575                         array_values( $varMap ),
 576                         $conds,
 577                         $fname,
 578                         $selectOptions,
 579                         $selectJoinConds
 580                 );
 581
 582                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 583
 584                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 585                         $this->ignoreDupValOnIndex = true;
 586                 }
 587
 588                 $retval = $this->query( $sql, $fname );
 589
 590                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 591                         $this->ignoreDupValOnIndex = false;
 592                 }
 593
 594                 return $retval;
 595         }
 596
 597         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 598                 $fname = __METHOD__
 599         ) {
 600                 if ( !count( $rows ) ) {
 601                         return true; // nothing to do
 602                 }
 603
 604                 if ( !is_array( reset( $rows ) ) ) {
 605                         $rows = [ $rows ];
 606                 }
 607
 608                 $sequenceData = $this->getSequenceData( $table );
 609                 if ( $sequenceData !== false ) {
 610                         // add sequence column to each list of columns, when not set
 611                         foreach ( $rows as &$row ) {
 612                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 613                                         $row[$sequenceData['column']] =
 614                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 615                                                         $sequenceData['sequence'] . '\')' );
 616                                 }
 617                         }
 618                 }
 619
 620                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 621         }
 622
 623         function tableName( $name, $format = 'quoted' ) {
 624                 /*
 625                 Replace reserved words with better ones
 626                 Using uppercase because that's the only way Oracle can handle
 627                 quoted tablenames
 628                 */
 629                 switch ( $name ) {
 630                         case 'user':
 631                                 $name = 'MWUSER';
 632                                 break;
 633                         case 'text':
 634                                 $name = 'PAGECONTENT';
 635                                 break;
 636                 }
 637
 638                 return strtoupper( parent::tableName( $name, $format ) );
 639         }
 640
 641         function tableNameInternal( $name ) {
 642                 $name = $this->tableName( $name );
 643
 644                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 645         }
 646
 647         /**
 648          * Return sequence_name if table has a sequence
 649          *
 650          * @param string $table
 651          * @return bool
 652          */
 653         private function getSequenceData( $table ) {
 654                 if ( $this->sequenceData == null ) {
 655                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 656                                 lower(atc.table_name),
 657                                 lower(atc.column_name)
 658                         FROM all_sequences asq, all_tab_columns atc
 659                         WHERE decode(
 660                                         atc.table_name,
 661                                         '{$this->tablePrefix}MWUSER',
 662                                         '{$this->tablePrefix}USER',
 663                                         atc.table_name
 664                                 ) || '_' ||
 665                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 666                                 AND asq.sequence_owner = upper('{$this->dbName}')
 667                                 AND atc.owner = upper('{$this->dbName}')" );
 668
 669                         while ( ( $row = $result->fetchRow() ) !== false ) {
 670                                 $this->sequenceData[$row[1]] = [
 671                                         'sequence' => $row[0],
 672                                         'column' => $row[2]
 673                                 ];
 674                         }
 675                 }
 676                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 677
 678                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 679         }
 680
 681         /**
 682          * Returns the size of a text field, or -1 for "unlimited"
 683          *
 684          * @param string $table
 685          * @param string $field
 686          * @return mixed
 687          */
 688         function textFieldSize( $table, $field ) {
 689                 $fieldInfoData = $this->fieldInfo( $table, $field );
 690
 691                 return $fieldInfoData->maxLength();
 692         }
 693
 694         function limitResult( $sql, $limit, $offset = false ) {
 695                 if ( $offset === false ) {
 696                         $offset = 0;
 697                 }
 698
 699                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 700         }
 701
 702         function encodeBlob( $b ) {
 703                 return new Blob( $b );
 704         }
 705
 706         function decodeBlob( $b ) {
 707                 if ( $b instanceof Blob ) {
 708                         $b = $b->fetch();
 709                 }
 710
 711                 return $b;
 712         }
 713
 714         function unionQueries( $sqls, $all ) {
 715                 $glue = ' UNION ALL ';
 716
 717                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 718                         'FROM (' . implode( $glue, $sqls ) . ')';
 719         }
 720
 721         function wasDeadlock() {
 722                 return $this->lastErrno() == 'OCI-00060';
 723         }
 724
 725         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 726                 $fname = __METHOD__
 727         ) {
 728                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 729
 730                 $newName = strtoupper( $newName );
 731                 $oldName = strtoupper( $oldName );
 732
 733                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 734                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 735                 $newPrefix = strtoupper( $this->tablePrefix );
 736
 737                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 738                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 739         }
 740
 741         function listTables( $prefix = null, $fname = __METHOD__ ) {
 742                 $listWhere = '';
 743                 if ( !empty( $prefix ) ) {
 744                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 745                 }
 746
 747                 $owner = strtoupper( $this->dbName );
 748                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 749                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 750
 751                 // dirty code ... i know
 752                 $endArray = [];
 753                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 754                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 755                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 756                 $fixedOrderTabs = $endArray;
 757                 while ( ( $row = $result->fetchRow() ) !== false ) {
 758                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 759                                 $endArray[] = $row['table_name'];
 760                         }
 761                 }
 762
 763                 return $endArray;
 764         }
 765
 766         public function dropTable( $tableName, $fName = __METHOD__ ) {
 767                 $tableName = $this->tableName( $tableName );
 768                 if ( !$this->tableExists( $tableName ) ) {
 769                         return false;
 770                 }
 771
 772                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 773         }
 774
 775         function timestamp( $ts = 0 ) {
 776                 return wfTimestamp( TS_ORACLE, $ts );
 777         }
 778
 779         /**
 780          * Return aggregated value function call
 781          *
 782          * @param array $valuedata
 783          * @param string $valuename
 784          * @return mixed
 785          */
 786         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 787                 return $valuedata;
 788         }
 789
 790         /**
 791          * @return string Wikitext of a link to the server software's web site
 792          */
 793         public function getSoftwareLink() {
 794                 return '[{{int:version-db-oracle-url}} Oracle]';
 795         }
 796
 797         /**
 798          * @return string Version information from the database
 799          */
 800         function getServerVersion() {
 801                 // better version number, fallback on driver
 802                 $rset = $this->doQuery(
 803                         'SELECT version FROM product_component_version ' .
 804                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 805                 );
 806                 $row = $rset->fetchRow();
 807                 if ( !$row ) {
 808                         return oci_server_version( $this->conn );
 809                 }
 810
 811                 return $row['version'];
 812         }
 813
 814         /**
 815          * Query whether a given index exists
 816          * @param string $table
 817          * @param string $index
 818          * @param string $fname
 819          * @return bool
 820          */
 821         function indexExists( $table, $index, $fname = __METHOD__ ) {
 822                 $table = $this->tableName( $table );
 823                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 824                 $index = strtoupper( $index );
 825                 $owner = strtoupper( $this->dbName );
 826                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 827                 $res = $this->doQuery( $sql );
 828                 if ( $res ) {
 829                         $count = $res->numRows();
 830                         $res->free();
 831                 } else {
 832                         $count = 0;
 833                 }
 834
 835                 return $count != 0;
 836         }
 837
 838         /**
 839          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 840          * @param string $table
 841          * @param string $fname
 842          * @return bool
 843          */
 844         function tableExists( $table, $fname = __METHOD__ ) {
 845                 $table = $this->tableName( $table );
 846                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 847                 $owner = $this->addQuotes( strtoupper( $this->dbName ) );
 848                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 849                 $res = $this->doQuery( $sql );
 850                 if ( $res && $res->numRows() > 0 ) {
 851                         $exists = true;
 852                 } else {
 853                         $exists = false;
 854                 }
 855
 856                 $res->free();
 857
 858                 return $exists;
 859         }
 860
 861         /**
 862          * Function translates mysql_fetch_field() functionality on ORACLE.
 863          * Caching is present for reducing query time.
 864          * For internal calls. Use fieldInfo for normal usage.
 865          * Returns false if the field doesn't exist
 866          *
 867          * @param array|string $table
 868          * @param string $field
 869          * @return ORAField|ORAResult|false
 870          */
 871         private function fieldInfoMulti( $table, $field ) {
 872                 $field = strtoupper( $field );
 873                 if ( is_array( $table ) ) {
 874                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 875                         $tableWhere = 'IN (';
 876                         foreach ( $table as &$singleTable ) {
 877                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 878                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 879                                         return $this->mFieldInfoCache["$singleTable.$field"];
 880                                 }
 881                                 $tableWhere .= '\'' . $singleTable . '\',';
 882                         }
 883                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 884                 } else {
 885                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 886                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 887                                 return $this->mFieldInfoCache["$table.$field"];
 888                         }
 889                         $tableWhere = '= \'' . $table . '\'';
 890                 }
 891
 892                 $fieldInfoStmt = oci_parse(
 893                         $this->conn,
 894                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 895                                 $tableWhere . ' and column_name = \'' . $field . '\''
 896                 );
 897                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 898                         $e = oci_error( $fieldInfoStmt );
 899                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 900
 901                         return false;
 902                 }
 903                 $res = new ORAResult( $this, $fieldInfoStmt );
 904                 if ( $res->numRows() == 0 ) {
 905                         if ( is_array( $table ) ) {
 906                                 foreach ( $table as &$singleTable ) {
 907                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 908                                 }
 909                         } else {
 910                                 $this->mFieldInfoCache["$table.$field"] = false;
 911                         }
 912                         $fieldInfoTemp = null;
 913                 } else {
 914                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 915                         $table = $fieldInfoTemp->tableName();
 916                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 917                 }
 918                 $res->free();
 919
 920                 return $fieldInfoTemp;
 921         }
 922
 923         /**
 924          * @throws DBUnexpectedError
 925          * @param string $table
 926          * @param string $field
 927          * @return ORAField
 928          */
 929         function fieldInfo( $table, $field ) {
 930                 if ( is_array( $table ) ) {
 931                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 932                 }
 933
 934                 return $this->fieldInfoMulti( $table, $field );
 935         }
 936
 937         protected function doBegin( $fname = __METHOD__ ) {
 938                 $this->trxLevel = 1;
 939                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 940         }
 941
 942         protected function doCommit( $fname = __METHOD__ ) {
 943                 if ( $this->trxLevel ) {
 944                         $ret = oci_commit( $this->conn );
 945                         if ( !$ret ) {
 946                                 throw new DBUnexpectedError( $this, $this->lastError() );
 947                         }
 948                         $this->trxLevel = 0;
 949                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 950                 }
 951         }
 952
 953         protected function doRollback( $fname = __METHOD__ ) {
 954                 if ( $this->trxLevel ) {
 955                         oci_rollback( $this->conn );
 956                         $this->trxLevel = 0;
 957                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 958                 }
 959         }
 960
 961         function sourceStream(
 962                 $fp,
 963                 callable $lineCallback = null,
 964                 callable $resultCallback = null,
 965                 $fname = __METHOD__, callable $inputCallback = null
 966         ) {
 967                 $cmd = '';
 968                 $done = false;
 969                 $dollarquote = false;
 970
 971                 $replacements = [];
 972                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 973                 while ( !feof( $fp ) ) {
 974                         if ( $lineCallback ) {
 975                                 call_user_func( $lineCallback );
 976                         }
 977                         $line = trim( fgets( $fp, 1024 ) );
 978                         $sl = strlen( $line ) - 1;
 979
 980                         if ( $sl < 0 ) {
 981                                 continue;
 982                         }
 983                         if ( '-' == $line[0] && '-' == $line[1] ) {
 984                                 continue;
 985                         }
 986
 987                         // Allow dollar quoting for function declarations
 988                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 989                                 if ( $dollarquote ) {
 990                                         $dollarquote = false;
 991                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 992                                         $done = true;
 993                                 } else {
 994                                         $dollarquote = true;
 995                                 }
 996                         } elseif ( !$dollarquote ) {
 997                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
 998                                         $done = true;
 999                                         $line = substr( $line, 0, $sl );
1000                                 }
1001                         }
1002
1003                         if ( $cmd != '' ) {
1004                                 $cmd .= ' ';
1005                         }
1006                         $cmd .= "$line\n";
1007
1008                         if ( $done ) {
1009                                 $cmd = str_replace( ';;', ";", $cmd );
1010                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1011                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1012                                                 $replacements[$defines[2]] = $defines[1];
1013                                         }
1014                                 } else {
1015                                         foreach ( $replacements as $mwVar => $scVar ) {
1016                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1017                                         }
1018
1019                                         $cmd = $this->replaceVars( $cmd );
1020                                         if ( $inputCallback ) {
1021                                                 call_user_func( $inputCallback, $cmd );
1022                                         }
1023                                         $res = $this->doQuery( $cmd );
1024                                         if ( $resultCallback ) {
1025                                                 call_user_func( $resultCallback, $res, $this );
1026                                         }
1027
1028                                         if ( false === $res ) {
1029                                                 $err = $this->lastError();
1030
1031                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1032                                         }
1033                                 }
1034
1035                                 $cmd = '';
1036                                 $done = false;
1037                         }
1038                 }
1039
1040                 return true;
1041         }
1042
1043         function selectDB( $db ) {
1044                 $this->dbName = $db;
1045                 if ( $db == null || $db == $this->user ) {
1046                         return true;
1047                 }
1048                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1049                 $stmt = oci_parse( $this->conn, $sql );
1050                 Wikimedia\suppressWarnings();
1051                 $success = oci_execute( $stmt );
1052                 Wikimedia\restoreWarnings();
1053                 if ( !$success ) {
1054                         $e = oci_error( $stmt );
1055                         if ( $e['code'] != '1435' ) {
1056                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1057                         }
1058
1059                         return false;
1060                 }
1061
1062                 return true;
1063         }
1064
1065         function strencode( $s ) {
1066                 return str_replace( "'", "''", $s );
1067         }
1068
1069         function addQuotes( $s ) {
1070                 global $wgContLang;
1071                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1072                         $s = $wgContLang->checkTitleEncoding( $s );
1073                 }
1074
1075                 return "'" . $this->strencode( $s ) . "'";
1076         }
1077
1078         public function addIdentifierQuotes( $s ) {
1079                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1080                         $s = '/*Q*/' . $s;
1081                 }
1082
1083                 return $s;
1084         }
1085
1086         public function removeIdentifierQuotes( $s ) {
1087                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1088         }
1089
1090         public function isQuotedIdentifier( $s ) {
1091                 return strpos( $s, '/*Q*/' ) !== false;
1092         }
1093
1094         private function wrapFieldForWhere( $table, &$col, &$val ) {
1095                 global $wgContLang;
1096
1097                 $col_info = $this->fieldInfoMulti( $table, $col );
1098                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1099                 if ( $col_type == 'CLOB' ) {
1100                         $col = 'TO_CHAR(' . $col . ')';
1101                         $val = $wgContLang->checkTitleEncoding( $val );
1102                 } elseif ( $col_type == 'VARCHAR2' ) {
1103                         $val = $wgContLang->checkTitleEncoding( $val );
1104                 }
1105         }
1106
1107         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1108                 $conds2 = [];
1109                 foreach ( $conds as $col => $val ) {
1110                         if ( is_array( $val ) ) {
1111                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1112                         } else {
1113                                 if ( is_numeric( $col ) && $parentCol != null ) {
1114                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1115                                 } else {
1116                                         $this->wrapFieldForWhere( $table, $col, $val );
1117                                 }
1118                                 $conds2[$col] = $val;
1119                         }
1120                 }
1121
1122                 return $conds2;
1123         }
1124
1125         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1126                 $options = [], $join_conds = []
1127         ) {
1128                 if ( is_array( $conds ) ) {
1129                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1130                 }
1131
1132                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1133         }
1134
1135         /**
1136          * Returns an optional USE INDEX clause to go after the table, and a
1137          * string to go at the end of the query
1138          *
1139          * @param array $options An associative array of options to be turned into
1140          *   an SQL query, valid keys are listed in the function.
1141          * @return array
1142          */
1143         function makeSelectOptions( $options ) {
1144                 $preLimitTail = $postLimitTail = '';
1145                 $startOpts = '';
1146
1147                 $noKeyOptions = [];
1148                 foreach ( $options as $key => $option ) {
1149                         if ( is_numeric( $key ) ) {
1150                                 $noKeyOptions[$option] = true;
1151                         }
1152                 }
1153
1154                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1155
1156                 $preLimitTail .= $this->makeOrderBy( $options );
1157
1158                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1159                         $postLimitTail .= ' FOR UPDATE';
1160                 }
1161
1162                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1163                         $startOpts .= 'DISTINCT';
1164                 }
1165
1166                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1167                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1168                 } else {
1169                         $useIndex = '';
1170                 }
1171
1172                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1173                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1174                 } else {
1175                         $ignoreIndex = '';
1176                 }
1177
1178                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1179         }
1180
1181         public function delete( $table, $conds, $fname = __METHOD__ ) {
1182                 global $wgActorTableSchemaMigrationStage;
1183
1184                 if ( is_array( $conds ) ) {
1185                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1186                 }
1187                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1188                 // all deletions on these tables have transactions so final failure rollbacks these updates
1189                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1190                 $table = $this->tableName( $table );
1191                 if ( $table == $this->tableName( 'user' ) && $wgActorTableSchemaMigrationStage < MIGRATION_NEW ) {
1192                         $this->update( 'archive', [ 'ar_user' => 0 ],
1193                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1194                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1195                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1196                         $this->update( 'image', [ 'img_user' => 0 ],
1197                                 [ 'img_user' => $conds['user_id'] ], $fname );
1198                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1199                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1200                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1201                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1202                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1203                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1204                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1205                                 [ 'us_user' => $conds['user_id'] ], $fname );
1206                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1207                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1208                         $this->update( 'logging', [ 'log_user' => 0 ],
1209                                 [ 'log_user' => $conds['user_id'] ], $fname );
1210                 } elseif ( $table == $this->tableName( 'image' ) ) {
1211                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1212                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1213                 }
1214
1215                 return parent::delete( $table, $conds, $fname );
1216         }
1217
1218         /**
1219          * @param string $table
1220          * @param array $values
1221          * @param array $conds
1222          * @param string $fname
1223          * @param array $options
1224          * @return bool
1225          * @throws DBUnexpectedError
1226          */
1227         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1228                 global $wgContLang;
1229
1230                 $table = $this->tableName( $table );
1231                 $opts = $this->makeUpdateOptions( $options );
1232                 $sql = "UPDATE $opts $table SET ";
1233
1234                 $first = true;
1235                 foreach ( $values as $col => &$val ) {
1236                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1237
1238                         if ( !$first ) {
1239                                 $sqlSet = ', ' . $sqlSet;
1240                         } else {
1241                                 $first = false;
1242                         }
1243                         $sql .= $sqlSet;
1244                 }
1245
1246                 if ( $conds !== [] && $conds !== '*' ) {
1247                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1248                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1249                 }
1250
1251                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1252                 if ( $stmt === false ) {
1253                         $e = oci_error( $this->conn );
1254                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1255
1256                         return false;
1257                 }
1258                 foreach ( $values as $col => &$val ) {
1259                         $col_info = $this->fieldInfoMulti( $table, $col );
1260                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1261
1262                         if ( $val === null ) {
1263                                 // do nothing ... null was inserted in statement creation
1264                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1265                                 if ( is_object( $val ) ) {
1266                                         $val = $val->getData();
1267                                 }
1268
1269                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1270                                         $val = '31-12-2030 12:00:00.000000';
1271                                 }
1272
1273                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1274                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1275                                         $e = oci_error( $stmt );
1276                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1277
1278                                         return false;
1279                                 }
1280                         } else {
1281                                 /** @var OCI_Lob[] $lob */
1282                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1283                                 if ( $lob[$col] === false ) {
1284                                         $e = oci_error( $stmt );
1285                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1286                                 }
1287
1288                                 if ( is_object( $val ) ) {
1289                                         $val = $val->getData();
1290                                 }
1291
1292                                 if ( $col_type == 'BLOB' ) {
1293                                         $lob[$col]->writeTemporary( $val );
1294                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1295                                 } else {
1296                                         $lob[$col]->writeTemporary( $val );
1297                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1298                                 }
1299                         }
1300                 }
1301
1302                 Wikimedia\suppressWarnings();
1303
1304                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1305                         $e = oci_error( $stmt );
1306                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1307                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1308
1309                                 return false;
1310                         } else {
1311                                 $this->mAffectedRows = oci_num_rows( $stmt );
1312                         }
1313                 } else {
1314                         $this->mAffectedRows = oci_num_rows( $stmt );
1315                 }
1316
1317                 Wikimedia\restoreWarnings();
1318
1319                 if ( isset( $lob ) ) {
1320                         foreach ( $lob as $lob_v ) {
1321                                 $lob_v->free();
1322                         }
1323                 }
1324
1325                 if ( !$this->trxLevel ) {
1326                         oci_commit( $this->conn );
1327                 }
1328
1329                 return oci_free_statement( $stmt );
1330         }
1331
1332         function bitNot( $field ) {
1333                 // expecting bit-fields smaller than 4bytes
1334                 return 'BITNOT(' . $field . ')';
1335         }
1336
1337         function bitAnd( $fieldLeft, $fieldRight ) {
1338                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1339         }
1340
1341         function bitOr( $fieldLeft, $fieldRight ) {
1342                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1343         }
1344
1345         function getDBname() {
1346                 return $this->dbName;
1347         }
1348
1349         function getServer() {
1350                 return $this->server;
1351         }
1352
1353         public function buildGroupConcatField(
1354                 $delim, $table, $field, $conds = '', $join_conds = []
1355         ) {
1356                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1357
1358                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1359         }
1360
1361         public function buildSubstring( $input, $startPosition, $length = null ) {
1362                 $this->assertBuildSubstringParams( $startPosition, $length );
1363                 $params = [ $input, $startPosition ];
1364                 if ( $length !== null ) {
1365                         $params[] = $length;
1366                 }
1367                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1368         }
1369
1370         /**
1371          * @param string $field Field or column to cast
1372          * @return string
1373          * @since 1.28
1374          */
1375         public function buildStringCast( $field ) {
1376                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1377         }
1378
1379         public function getInfinity() {
1380                 return '31-12-2030 12:00:00.000000';
1381         }
1382 }