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 use Wikimedia\Rdbms\Blob;
  24 use Wikimedia\Rdbms\ResultWrapper;
  25
  26 /**
  27  * @ingroup Database
  28  */
  29 class DatabaseOracle extends Database {
  30         /** @var resource */
  31         protected $mLastResult = null;
  32
  33         /** @var int The number of rows affected as an integer */
  34         protected $mAffectedRows;
  35
  36         /** @var int */
  37         private $mInsertId = null;
  38
  39         /** @var bool */
  40         private $ignoreDupValOnIndex = false;
  41
  42         /** @var bool|array */
  43         private $sequenceData = null;
  44
  45         /** @var string Character set for Oracle database */
  46         private $defaultCharset = 'AL32UTF8';
  47
  48         /** @var array */
  49         private $mFieldInfoCache = [];
  50
  51         function __construct( array $p ) {
  52                 global $wgDBprefix;
  53
  54                 if ( $p['tablePrefix'] == 'get from global' ) {
  55                         $p['tablePrefix'] = $wgDBprefix;
  56                 }
  57                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  58                 parent::__construct( $p );
  59                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  60         }
  61
  62         function __destruct() {
  63                 if ( $this->mOpened ) {
  64                         MediaWiki\suppressWarnings();
  65                         $this->close();
  66                         MediaWiki\restoreWarnings();
  67                 }
  68         }
  69
  70         function getType() {
  71                 return 'oracle';
  72         }
  73
  74         function implicitGroupby() {
  75                 return false;
  76         }
  77
  78         function implicitOrderby() {
  79                 return false;
  80         }
  81
  82         /**
  83          * Usually aborts on failure
  84          * @param string $server
  85          * @param string $user
  86          * @param string $password
  87          * @param string $dbName
  88          * @throws DBConnectionError
  89          * @return resource|null
  90          */
  91         function open( $server, $user, $password, $dbName ) {
  92                 global $wgDBOracleDRCP;
  93                 if ( !function_exists( 'oci_connect' ) ) {
  94                         throw new DBConnectionError(
  95                                 $this,
  96                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  97                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  98                                         "and database)\n" );
  99                 }
 100
 101                 $this->close();
 102                 $this->mUser = $user;
 103                 $this->mPassword = $password;
 104                 // changed internal variables functions
 105                 // mServer now holds the TNS endpoint
 106                 // mDBname is schema name if different from username
 107                 if ( !$server ) {
 108                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 109                         $this->mServer = $dbName;
 110                         $this->mDBname = $user;
 111                 } else {
 112                         $this->mServer = $server;
 113                         if ( !$dbName ) {
 114                                 $this->mDBname = $user;
 115                         } else {
 116                                 $this->mDBname = $dbName;
 117                         }
 118                 }
 119
 120                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 121                         return null;
 122                 }
 123
 124                 if ( $wgDBOracleDRCP ) {
 125                         $this->setFlag( DBO_PERSISTENT );
 126                 }
 127
 128                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 129
 130                 MediaWiki\suppressWarnings();
 131                 if ( $this->mFlags & DBO_PERSISTENT ) {
 132                         $this->mConn = oci_pconnect(
 133                                 $this->mUser,
 134                                 $this->mPassword,
 135                                 $this->mServer,
 136                                 $this->defaultCharset,
 137                                 $session_mode
 138                         );
 139                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 140                         $this->mConn = oci_new_connect(
 141                                 $this->mUser,
 142                                 $this->mPassword,
 143                                 $this->mServer,
 144                                 $this->defaultCharset,
 145                                 $session_mode
 146                         );
 147                 } else {
 148                         $this->mConn = oci_connect(
 149                                 $this->mUser,
 150                                 $this->mPassword,
 151                                 $this->mServer,
 152                                 $this->defaultCharset,
 153                                 $session_mode
 154                         );
 155                 }
 156                 MediaWiki\restoreWarnings();
 157
 158                 if ( $this->mUser != $this->mDBname ) {
 159                         // change current schema in session
 160                         $this->selectDB( $this->mDBname );
 161                 }
 162
 163                 if ( !$this->mConn ) {
 164                         throw new DBConnectionError( $this, $this->lastError() );
 165                 }
 166
 167                 $this->mOpened = true;
 168
 169                 # removed putenv calls because they interfere with the system globaly
 170                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 171                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 172                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 173
 174                 return $this->mConn;
 175         }
 176
 177         /**
 178          * Closes a database connection, if it is open
 179          * Returns success, true if already closed
 180          * @return bool
 181          */
 182         protected function closeConnection() {
 183                 return oci_close( $this->mConn );
 184         }
 185
 186         function execFlags() {
 187                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 188         }
 189
 190         protected function doQuery( $sql ) {
 191                 wfDebug( "SQL: [$sql]\n" );
 192                 if ( !StringUtils::isUtf8( $sql ) ) {
 193                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 194                 }
 195
 196                 // handle some oracle specifics
 197                 // remove AS column/table/subquery namings
 198                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 199                         $sql = preg_replace( '/ as /i', ' ', $sql );
 200                 }
 201
 202                 // Oracle has issues with UNION clause if the statement includes LOB fields
 203                 // So we do a UNION ALL and then filter the results array with array_unique
 204                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 205                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 206                 // you have to select data from plan table after explain
 207                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 208
 209                 $sql = preg_replace(
 210                         '/^EXPLAIN /',
 211                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 212                         $sql,
 213                         1,
 214                         $explain_count
 215                 );
 216
 217                 MediaWiki\suppressWarnings();
 218
 219                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 220                 if ( $stmt === false ) {
 221                         $e = oci_error( $this->mConn );
 222                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 223
 224                         return false;
 225                 }
 226
 227                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 228                         $e = oci_error( $stmt );
 229                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 230                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 231
 232                                 return false;
 233                         }
 234                 }
 235
 236                 MediaWiki\restoreWarnings();
 237
 238                 if ( $explain_count > 0 ) {
 239                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 240                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 241                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 242                         return new ORAResult( $this, $stmt, $union_unique );
 243                 } else {
 244                         $this->mAffectedRows = oci_num_rows( $stmt );
 245
 246                         return true;
 247                 }
 248         }
 249
 250         function queryIgnore( $sql, $fname = '' ) {
 251                 return $this->query( $sql, $fname, true );
 252         }
 253
 254         /**
 255          * Frees resources associated with the LOB descriptor
 256          * @param ResultWrapper|ORAResult $res
 257          */
 258         function freeResult( $res ) {
 259                 if ( $res instanceof ResultWrapper ) {
 260                         $res = $res->result;
 261                 }
 262
 263                 $res->free();
 264         }
 265
 266         /**
 267          * @param ResultWrapper|ORAResult $res
 268          * @return mixed
 269          */
 270         function fetchObject( $res ) {
 271                 if ( $res instanceof ResultWrapper ) {
 272                         $res = $res->result;
 273                 }
 274
 275                 return $res->fetchObject();
 276         }
 277
 278         /**
 279          * @param ResultWrapper|ORAResult $res
 280          * @return mixed
 281          */
 282         function fetchRow( $res ) {
 283                 if ( $res instanceof ResultWrapper ) {
 284                         $res = $res->result;
 285                 }
 286
 287                 return $res->fetchRow();
 288         }
 289
 290         /**
 291          * @param ResultWrapper|ORAResult $res
 292          * @return int
 293          */
 294         function numRows( $res ) {
 295                 if ( $res instanceof ResultWrapper ) {
 296                         $res = $res->result;
 297                 }
 298
 299                 return $res->numRows();
 300         }
 301
 302         /**
 303          * @param ResultWrapper|ORAResult $res
 304          * @return int
 305          */
 306         function numFields( $res ) {
 307                 if ( $res instanceof ResultWrapper ) {
 308                         $res = $res->result;
 309                 }
 310
 311                 return $res->numFields();
 312         }
 313
 314         function fieldName( $stmt, $n ) {
 315                 return oci_field_name( $stmt, $n );
 316         }
 317
 318         /**
 319          * This must be called after nextSequenceVal
 320          * @return null|int
 321          */
 322         function insertId() {
 323                 return $this->mInsertId;
 324         }
 325
 326         /**
 327          * @param mixed $res
 328          * @param int $row
 329          */
 330         function dataSeek( $res, $row ) {
 331                 if ( $res instanceof ORAResult ) {
 332                         $res->seek( $row );
 333                 } else {
 334                         $res->result->seek( $row );
 335                 }
 336         }
 337
 338         function lastError() {
 339                 if ( $this->mConn === false ) {
 340                         $e = oci_error();
 341                 } else {
 342                         $e = oci_error( $this->mConn );
 343                 }
 344
 345                 return $e['message'];
 346         }
 347
 348         function lastErrno() {
 349                 if ( $this->mConn === false ) {
 350                         $e = oci_error();
 351                 } else {
 352                         $e = oci_error( $this->mConn );
 353                 }
 354
 355                 return $e['code'];
 356         }
 357
 358         function affectedRows() {
 359                 return $this->mAffectedRows;
 360         }
 361
 362         /**
 363          * Returns information about an index
 364          * If errors are explicitly ignored, returns NULL on failure
 365          * @param string $table
 366          * @param string $index
 367          * @param string $fname
 368          * @return bool
 369          */
 370         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 371                 return false;
 372         }
 373
 374         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 375                 return false;
 376         }
 377
 378         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 379                 if ( !count( $a ) ) {
 380                         return true;
 381                 }
 382
 383                 if ( !is_array( $options ) ) {
 384                         $options = [ $options ];
 385                 }
 386
 387                 if ( in_array( 'IGNORE', $options ) ) {
 388                         $this->ignoreDupValOnIndex = true;
 389                 }
 390
 391                 if ( !is_array( reset( $a ) ) ) {
 392                         $a = [ $a ];
 393                 }
 394
 395                 foreach ( $a as &$row ) {
 396                         $this->insertOneRow( $table, $row, $fname );
 397                 }
 398                 $retVal = true;
 399
 400                 if ( in_array( 'IGNORE', $options ) ) {
 401                         $this->ignoreDupValOnIndex = false;
 402                 }
 403
 404                 return $retVal;
 405         }
 406
 407         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 408                 $col_info = $this->fieldInfoMulti( $table, $col );
 409                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 410
 411                 $bind = '';
 412                 if ( is_numeric( $col ) ) {
 413                         $bind = $val;
 414                         $val = null;
 415
 416                         return $bind;
 417                 } elseif ( $includeCol ) {
 418                         $bind = "$col = ";
 419                 }
 420
 421                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 422                         $val = null;
 423                 }
 424
 425                 if ( $val === 'NULL' ) {
 426                         $val = null;
 427                 }
 428
 429                 if ( $val === null ) {
 430                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 431                                 $bind .= 'DEFAULT';
 432                         } else {
 433                                 $bind .= 'NULL';
 434                         }
 435                 } else {
 436                         $bind .= ':' . $col;
 437                 }
 438
 439                 return $bind;
 440         }
 441
 442         /**
 443          * @param string $table
 444          * @param array $row
 445          * @param string $fname
 446          * @return bool
 447          * @throws DBUnexpectedError
 448          */
 449         private function insertOneRow( $table, $row, $fname ) {
 450                 global $wgContLang;
 451
 452                 $table = $this->tableName( $table );
 453                 // "INSERT INTO tables (a, b, c)"
 454                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 455                 $sql .= " VALUES (";
 456
 457                 // for each value, append ":key"
 458                 $first = true;
 459                 foreach ( $row as $col => &$val ) {
 460                         if ( !$first ) {
 461                                 $sql .= ', ';
 462                         } else {
 463                                 $first = false;
 464                         }
 465                         if ( $this->isQuotedIdentifier( $val ) ) {
 466                                 $sql .= $this->removeIdentifierQuotes( $val );
 467                                 unset( $row[$col] );
 468                         } else {
 469                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 470                         }
 471                 }
 472                 $sql .= ')';
 473
 474                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 475                 if ( $stmt === false ) {
 476                         $e = oci_error( $this->mConn );
 477                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 478
 479                         return false;
 480                 }
 481                 foreach ( $row as $col => &$val ) {
 482                         $col_info = $this->fieldInfoMulti( $table, $col );
 483                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 484
 485                         if ( $val === null ) {
 486                                 // do nothing ... null was inserted in statement creation
 487                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 488                                 if ( is_object( $val ) ) {
 489                                         $val = $val->fetch();
 490                                 }
 491
 492                                 // backward compatibility
 493                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 494                                         $val = $this->getInfinity();
 495                                 }
 496
 497                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 498                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 499                                         $e = oci_error( $stmt );
 500                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 501
 502                                         return false;
 503                                 }
 504                         } else {
 505                                 /** @var OCI_Lob[] $lob */
 506                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
 507                                 if ( $lob[$col] === false ) {
 508                                         $e = oci_error( $stmt );
 509                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 510                                 }
 511
 512                                 if ( is_object( $val ) ) {
 513                                         $val = $val->fetch();
 514                                 }
 515
 516                                 if ( $col_type == 'BLOB' ) {
 517                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 518                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 519                                 } else {
 520                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 521                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 522                                 }
 523                         }
 524                 }
 525
 526                 MediaWiki\suppressWarnings();
 527
 528                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 529                         $e = oci_error( $stmt );
 530                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 531                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 532
 533                                 return false;
 534                         } else {
 535                                 $this->mAffectedRows = oci_num_rows( $stmt );
 536                         }
 537                 } else {
 538                         $this->mAffectedRows = oci_num_rows( $stmt );
 539                 }
 540
 541                 MediaWiki\restoreWarnings();
 542
 543                 if ( isset( $lob ) ) {
 544                         foreach ( $lob as $lob_v ) {
 545                                 $lob_v->free();
 546                         }
 547                 }
 548
 549                 if ( !$this->mTrxLevel ) {
 550                         oci_commit( $this->mConn );
 551                 }
 552
 553                 return oci_free_statement( $stmt );
 554         }
 555
 556         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 557                 $insertOptions = [], $selectOptions = []
 558         ) {
 559                 $destTable = $this->tableName( $destTable );
 560                 if ( !is_array( $selectOptions ) ) {
 561                         $selectOptions = [ $selectOptions ];
 562                 }
 563                 list( $startOpts, $useIndex, $tailOpts, $ignoreIndex ) =
 564                         $this->makeSelectOptions( $selectOptions );
 565                 if ( is_array( $srcTable ) ) {
 566                         $srcTable = implode( ',', array_map( [ $this, 'tableName' ], $srcTable ) );
 567                 } else {
 568                         $srcTable = $this->tableName( $srcTable );
 569                 }
 570
 571                 $sequenceData = $this->getSequenceData( $destTable );
 572                 if ( $sequenceData !== false &&
 573                         !isset( $varMap[$sequenceData['column']] )
 574                 ) {
 575                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 576                 }
 577
 578                 // count-alias subselect fields to avoid abigious definition errors
 579                 $i = 0;
 580                 foreach ( $varMap as &$val ) {
 581                         $val = $val . ' field' . ( $i++ );
 582                 }
 583
 584                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 585                         " SELECT $startOpts " . implode( ',', $varMap ) .
 586                         " FROM $srcTable $useIndex $ignoreIndex ";
 587                 if ( $conds != '*' ) {
 588                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 589                 }
 590                 $sql .= " $tailOpts";
 591
 592                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 593                         $this->ignoreDupValOnIndex = true;
 594                 }
 595
 596                 $retval = $this->query( $sql, $fname );
 597
 598                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 599                         $this->ignoreDupValOnIndex = false;
 600                 }
 601
 602                 return $retval;
 603         }
 604
 605         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 606                 $fname = __METHOD__
 607         ) {
 608                 if ( !count( $rows ) ) {
 609                         return true; // nothing to do
 610                 }
 611
 612                 if ( !is_array( reset( $rows ) ) ) {
 613                         $rows = [ $rows ];
 614                 }
 615
 616                 $sequenceData = $this->getSequenceData( $table );
 617                 if ( $sequenceData !== false ) {
 618                         // add sequence column to each list of columns, when not set
 619                         foreach ( $rows as &$row ) {
 620                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 621                                         $row[$sequenceData['column']] =
 622                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 623                                                         $sequenceData['sequence'] . '\')' );
 624                                 }
 625                         }
 626                 }
 627
 628                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 629         }
 630
 631         function tableName( $name, $format = 'quoted' ) {
 632                 /*
 633                 Replace reserved words with better ones
 634                 Using uppercase because that's the only way Oracle can handle
 635                 quoted tablenames
 636                 */
 637                 switch ( $name ) {
 638                         case 'user':
 639                                 $name = 'MWUSER';
 640                                 break;
 641                         case 'text':
 642                                 $name = 'PAGECONTENT';
 643                                 break;
 644                 }
 645
 646                 return strtoupper( parent::tableName( $name, $format ) );
 647         }
 648
 649         function tableNameInternal( $name ) {
 650                 $name = $this->tableName( $name );
 651
 652                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 653         }
 654
 655         /**
 656          * Return the next in a sequence, save the value for retrieval via insertId()
 657          *
 658          * @param string $seqName
 659          * @return null|int
 660          */
 661         function nextSequenceValue( $seqName ) {
 662                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 663                 $row = $this->fetchRow( $res );
 664                 $this->mInsertId = $row[0];
 665
 666                 return $this->mInsertId;
 667         }
 668
 669         /**
 670          * Return sequence_name if table has a sequence
 671          *
 672          * @param string $table
 673          * @return bool
 674          */
 675         private function getSequenceData( $table ) {
 676                 if ( $this->sequenceData == null ) {
 677                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 678                                 lower(atc.table_name),
 679                                 lower(atc.column_name)
 680                         FROM all_sequences asq, all_tab_columns atc
 681                         WHERE decode(
 682                                         atc.table_name,
 683                                         '{$this->mTablePrefix}MWUSER',
 684                                         '{$this->mTablePrefix}USER',
 685                                         atc.table_name
 686                                 ) || '_' ||
 687                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 688                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 689                                 AND atc.owner = upper('{$this->mDBname}')" );
 690
 691                         while ( ( $row = $result->fetchRow() ) !== false ) {
 692                                 $this->sequenceData[$row[1]] = [
 693                                         'sequence' => $row[0],
 694                                         'column' => $row[2]
 695                                 ];
 696                         }
 697                 }
 698                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 699
 700                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 701         }
 702
 703         /**
 704          * Returns the size of a text field, or -1 for "unlimited"
 705          *
 706          * @param string $table
 707          * @param string $field
 708          * @return mixed
 709          */
 710         function textFieldSize( $table, $field ) {
 711                 $fieldInfoData = $this->fieldInfo( $table, $field );
 712
 713                 return $fieldInfoData->maxLength();
 714         }
 715
 716         function limitResult( $sql, $limit, $offset = false ) {
 717                 if ( $offset === false ) {
 718                         $offset = 0;
 719                 }
 720
 721                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 722         }
 723
 724         function encodeBlob( $b ) {
 725                 return new Blob( $b );
 726         }
 727
 728         function decodeBlob( $b ) {
 729                 if ( $b instanceof Blob ) {
 730                         $b = $b->fetch();
 731                 }
 732
 733                 return $b;
 734         }
 735
 736         function unionQueries( $sqls, $all ) {
 737                 $glue = ' UNION ALL ';
 738
 739                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 740                         'FROM (' . implode( $glue, $sqls ) . ')';
 741         }
 742
 743         function wasDeadlock() {
 744                 return $this->lastErrno() == 'OCI-00060';
 745         }
 746
 747         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 748                 $fname = __METHOD__
 749         ) {
 750                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 751
 752                 $newName = strtoupper( $newName );
 753                 $oldName = strtoupper( $oldName );
 754
 755                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 756                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 757                 $newPrefix = strtoupper( $this->mTablePrefix );
 758
 759                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 760                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 761         }
 762
 763         function listTables( $prefix = null, $fname = __METHOD__ ) {
 764                 $listWhere = '';
 765                 if ( !empty( $prefix ) ) {
 766                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 767                 }
 768
 769                 $owner = strtoupper( $this->mDBname );
 770                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 771                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 772
 773                 // dirty code ... i know
 774                 $endArray = [];
 775                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 776                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 777                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 778                 $fixedOrderTabs = $endArray;
 779                 while ( ( $row = $result->fetchRow() ) !== false ) {
 780                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 781                                 $endArray[] = $row['table_name'];
 782                         }
 783                 }
 784
 785                 return $endArray;
 786         }
 787
 788         public function dropTable( $tableName, $fName = __METHOD__ ) {
 789                 $tableName = $this->tableName( $tableName );
 790                 if ( !$this->tableExists( $tableName ) ) {
 791                         return false;
 792                 }
 793
 794                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 795         }
 796
 797         function timestamp( $ts = 0 ) {
 798                 return wfTimestamp( TS_ORACLE, $ts );
 799         }
 800
 801         /**
 802          * Return aggregated value function call
 803          *
 804          * @param array $valuedata
 805          * @param string $valuename
 806          * @return mixed
 807          */
 808         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 809                 return $valuedata;
 810         }
 811
 812         /**
 813          * @return string Wikitext of a link to the server software's web site
 814          */
 815         public function getSoftwareLink() {
 816                 return '[{{int:version-db-oracle-url}} Oracle]';
 817         }
 818
 819         /**
 820          * @return string Version information from the database
 821          */
 822         function getServerVersion() {
 823                 // better version number, fallback on driver
 824                 $rset = $this->doQuery(
 825                         'SELECT version FROM product_component_version ' .
 826                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 827                 );
 828                 $row = $rset->fetchRow();
 829                 if ( !$row ) {
 830                         return oci_server_version( $this->mConn );
 831                 }
 832
 833                 return $row['version'];
 834         }
 835
 836         /**
 837          * Query whether a given index exists
 838          * @param string $table
 839          * @param string $index
 840          * @param string $fname
 841          * @return bool
 842          */
 843         function indexExists( $table, $index, $fname = __METHOD__ ) {
 844                 $table = $this->tableName( $table );
 845                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 846                 $index = strtoupper( $index );
 847                 $owner = strtoupper( $this->mDBname );
 848                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 849                 $res = $this->doQuery( $sql );
 850                 if ( $res ) {
 851                         $count = $res->numRows();
 852                         $res->free();
 853                 } else {
 854                         $count = 0;
 855                 }
 856
 857                 return $count != 0;
 858         }
 859
 860         /**
 861          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 862          * @param string $table
 863          * @param string $fname
 864          * @return bool
 865          */
 866         function tableExists( $table, $fname = __METHOD__ ) {
 867                 $table = $this->tableName( $table );
 868                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 869                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 870                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 871                 $res = $this->doQuery( $sql );
 872                 if ( $res && $res->numRows() > 0 ) {
 873                         $exists = true;
 874                 } else {
 875                         $exists = false;
 876                 }
 877
 878                 $res->free();
 879
 880                 return $exists;
 881         }
 882
 883         /**
 884          * Function translates mysql_fetch_field() functionality on ORACLE.
 885          * Caching is present for reducing query time.
 886          * For internal calls. Use fieldInfo for normal usage.
 887          * Returns false if the field doesn't exist
 888          *
 889          * @param array|string $table
 890          * @param string $field
 891          * @return ORAField|ORAResult|false
 892          */
 893         private function fieldInfoMulti( $table, $field ) {
 894                 $field = strtoupper( $field );
 895                 if ( is_array( $table ) ) {
 896                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 897                         $tableWhere = 'IN (';
 898                         foreach ( $table as &$singleTable ) {
 899                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 900                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 901                                         return $this->mFieldInfoCache["$singleTable.$field"];
 902                                 }
 903                                 $tableWhere .= '\'' . $singleTable . '\',';
 904                         }
 905                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 906                 } else {
 907                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 908                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 909                                 return $this->mFieldInfoCache["$table.$field"];
 910                         }
 911                         $tableWhere = '= \'' . $table . '\'';
 912                 }
 913
 914                 $fieldInfoStmt = oci_parse(
 915                         $this->mConn,
 916                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 917                                 $tableWhere . ' and column_name = \'' . $field . '\''
 918                 );
 919                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 920                         $e = oci_error( $fieldInfoStmt );
 921                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 922
 923                         return false;
 924                 }
 925                 $res = new ORAResult( $this, $fieldInfoStmt );
 926                 if ( $res->numRows() == 0 ) {
 927                         if ( is_array( $table ) ) {
 928                                 foreach ( $table as &$singleTable ) {
 929                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 930                                 }
 931                         } else {
 932                                 $this->mFieldInfoCache["$table.$field"] = false;
 933                         }
 934                         $fieldInfoTemp = null;
 935                 } else {
 936                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 937                         $table = $fieldInfoTemp->tableName();
 938                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 939                 }
 940                 $res->free();
 941
 942                 return $fieldInfoTemp;
 943         }
 944
 945         /**
 946          * @throws DBUnexpectedError
 947          * @param string $table
 948          * @param string $field
 949          * @return ORAField
 950          */
 951         function fieldInfo( $table, $field ) {
 952                 if ( is_array( $table ) ) {
 953                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 954                 }
 955
 956                 return $this->fieldInfoMulti( $table, $field );
 957         }
 958
 959         protected function doBegin( $fname = __METHOD__ ) {
 960                 $this->mTrxLevel = 1;
 961                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 962         }
 963
 964         protected function doCommit( $fname = __METHOD__ ) {
 965                 if ( $this->mTrxLevel ) {
 966                         $ret = oci_commit( $this->mConn );
 967                         if ( !$ret ) {
 968                                 throw new DBUnexpectedError( $this, $this->lastError() );
 969                         }
 970                         $this->mTrxLevel = 0;
 971                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 972                 }
 973         }
 974
 975         protected function doRollback( $fname = __METHOD__ ) {
 976                 if ( $this->mTrxLevel ) {
 977                         oci_rollback( $this->mConn );
 978                         $this->mTrxLevel = 0;
 979                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 980                 }
 981         }
 982
 983         function sourceStream(
 984                 $fp,
 985                 callable $lineCallback = null,
 986                 callable $resultCallback = null,
 987                 $fname = __METHOD__, callable $inputCallback = null
 988         ) {
 989                 $cmd = '';
 990                 $done = false;
 991                 $dollarquote = false;
 992
 993                 $replacements = [];
 994                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 995                 while ( !feof( $fp ) ) {
 996                         if ( $lineCallback ) {
 997                                 call_user_func( $lineCallback );
 998                         }
 999                         $line = trim( fgets( $fp, 1024 ) );
1000                         $sl = strlen( $line ) - 1;
1001
1002                         if ( $sl < 0 ) {
1003                                 continue;
1004                         }
1005                         if ( '-' == $line[0] && '-' == $line[1] ) {
1006                                 continue;
1007                         }
1008
1009                         // Allow dollar quoting for function declarations
1010                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1011                                 if ( $dollarquote ) {
1012                                         $dollarquote = false;
1013                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1014                                         $done = true;
1015                                 } else {
1016                                         $dollarquote = true;
1017                                 }
1018                         } elseif ( !$dollarquote ) {
1019                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1020                                         $done = true;
1021                                         $line = substr( $line, 0, $sl );
1022                                 }
1023                         }
1024
1025                         if ( $cmd != '' ) {
1026                                 $cmd .= ' ';
1027                         }
1028                         $cmd .= "$line\n";
1029
1030                         if ( $done ) {
1031                                 $cmd = str_replace( ';;', ";", $cmd );
1032                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1033                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1034                                                 $replacements[$defines[2]] = $defines[1];
1035                                         }
1036                                 } else {
1037                                         foreach ( $replacements as $mwVar => $scVar ) {
1038                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1039                                         }
1040
1041                                         $cmd = $this->replaceVars( $cmd );
1042                                         if ( $inputCallback ) {
1043                                                 call_user_func( $inputCallback, $cmd );
1044                                         }
1045                                         $res = $this->doQuery( $cmd );
1046                                         if ( $resultCallback ) {
1047                                                 call_user_func( $resultCallback, $res, $this );
1048                                         }
1049
1050                                         if ( false === $res ) {
1051                                                 $err = $this->lastError();
1052
1053                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1054                                         }
1055                                 }
1056
1057                                 $cmd = '';
1058                                 $done = false;
1059                         }
1060                 }
1061
1062                 return true;
1063         }
1064
1065         function selectDB( $db ) {
1066                 $this->mDBname = $db;
1067                 if ( $db == null || $db == $this->mUser ) {
1068                         return true;
1069                 }
1070                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1071                 $stmt = oci_parse( $this->mConn, $sql );
1072                 MediaWiki\suppressWarnings();
1073                 $success = oci_execute( $stmt );
1074                 MediaWiki\restoreWarnings();
1075                 if ( !$success ) {
1076                         $e = oci_error( $stmt );
1077                         if ( $e['code'] != '1435' ) {
1078                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1079                         }
1080
1081                         return false;
1082                 }
1083
1084                 return true;
1085         }
1086
1087         function strencode( $s ) {
1088                 return str_replace( "'", "''", $s );
1089         }
1090
1091         function addQuotes( $s ) {
1092                 global $wgContLang;
1093                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1094                         $s = $wgContLang->checkTitleEncoding( $s );
1095                 }
1096
1097                 return "'" . $this->strencode( $s ) . "'";
1098         }
1099
1100         public function addIdentifierQuotes( $s ) {
1101                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1102                         $s = '/*Q*/' . $s;
1103                 }
1104
1105                 return $s;
1106         }
1107
1108         public function removeIdentifierQuotes( $s ) {
1109                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1110         }
1111
1112         public function isQuotedIdentifier( $s ) {
1113                 return strpos( $s, '/*Q*/' ) !== false;
1114         }
1115
1116         private function wrapFieldForWhere( $table, &$col, &$val ) {
1117                 global $wgContLang;
1118
1119                 $col_info = $this->fieldInfoMulti( $table, $col );
1120                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1121                 if ( $col_type == 'CLOB' ) {
1122                         $col = 'TO_CHAR(' . $col . ')';
1123                         $val = $wgContLang->checkTitleEncoding( $val );
1124                 } elseif ( $col_type == 'VARCHAR2' ) {
1125                         $val = $wgContLang->checkTitleEncoding( $val );
1126                 }
1127         }
1128
1129         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1130                 $conds2 = [];
1131                 foreach ( $conds as $col => $val ) {
1132                         if ( is_array( $val ) ) {
1133                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1134                         } else {
1135                                 if ( is_numeric( $col ) && $parentCol != null ) {
1136                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1137                                 } else {
1138                                         $this->wrapFieldForWhere( $table, $col, $val );
1139                                 }
1140                                 $conds2[$col] = $val;
1141                         }
1142                 }
1143
1144                 return $conds2;
1145         }
1146
1147         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1148                 $options = [], $join_conds = []
1149         ) {
1150                 if ( is_array( $conds ) ) {
1151                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1152                 }
1153
1154                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1155         }
1156
1157         /**
1158          * Returns an optional USE INDEX clause to go after the table, and a
1159          * string to go at the end of the query
1160          *
1161          * @param array $options An associative array of options to be turned into
1162          *   an SQL query, valid keys are listed in the function.
1163          * @return array
1164          */
1165         function makeSelectOptions( $options ) {
1166                 $preLimitTail = $postLimitTail = '';
1167                 $startOpts = '';
1168
1169                 $noKeyOptions = [];
1170                 foreach ( $options as $key => $option ) {
1171                         if ( is_numeric( $key ) ) {
1172                                 $noKeyOptions[$option] = true;
1173                         }
1174                 }
1175
1176                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1177
1178                 $preLimitTail .= $this->makeOrderBy( $options );
1179
1180                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1181                         $postLimitTail .= ' FOR UPDATE';
1182                 }
1183
1184                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1185                         $startOpts .= 'DISTINCT';
1186                 }
1187
1188                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1189                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1190                 } else {
1191                         $useIndex = '';
1192                 }
1193
1194                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1195                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1196                 } else {
1197                         $ignoreIndex = '';
1198                 }
1199
1200                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1201         }
1202
1203         public function delete( $table, $conds, $fname = __METHOD__ ) {
1204                 if ( is_array( $conds ) ) {
1205                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1206                 }
1207                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1208                 // all deletions on these tables have transactions so final failure rollbacks these updates
1209                 $table = $this->tableName( $table );
1210                 if ( $table == $this->tableName( 'user' ) ) {
1211                         $this->update( 'archive', [ 'ar_user' => 0 ],
1212                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1213                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1214                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1215                         $this->update( 'image', [ 'img_user' => 0 ],
1216                                 [ 'img_user' => $conds['user_id'] ], $fname );
1217                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1218                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1219                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1220                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1221                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1222                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1223                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1224                                 [ 'us_user' => $conds['user_id'] ], $fname );
1225                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1226                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1227                         $this->update( 'logging', [ 'log_user' => 0 ],
1228                                 [ 'log_user' => $conds['user_id'] ], $fname );
1229                 } elseif ( $table == $this->tableName( 'image' ) ) {
1230                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1231                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1232                 }
1233
1234                 return parent::delete( $table, $conds, $fname );
1235         }
1236
1237         /**
1238          * @param string $table
1239          * @param array $values
1240          * @param array $conds
1241          * @param string $fname
1242          * @param array $options
1243          * @return bool
1244          * @throws DBUnexpectedError
1245          */
1246         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1247                 global $wgContLang;
1248
1249                 $table = $this->tableName( $table );
1250                 $opts = $this->makeUpdateOptions( $options );
1251                 $sql = "UPDATE $opts $table SET ";
1252
1253                 $first = true;
1254                 foreach ( $values as $col => &$val ) {
1255                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1256
1257                         if ( !$first ) {
1258                                 $sqlSet = ', ' . $sqlSet;
1259                         } else {
1260                                 $first = false;
1261                         }
1262                         $sql .= $sqlSet;
1263                 }
1264
1265                 if ( $conds !== [] && $conds !== '*' ) {
1266                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1267                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1268                 }
1269
1270                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1271                 if ( $stmt === false ) {
1272                         $e = oci_error( $this->mConn );
1273                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1274
1275                         return false;
1276                 }
1277                 foreach ( $values as $col => &$val ) {
1278                         $col_info = $this->fieldInfoMulti( $table, $col );
1279                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1280
1281                         if ( $val === null ) {
1282                                 // do nothing ... null was inserted in statement creation
1283                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1284                                 if ( is_object( $val ) ) {
1285                                         $val = $val->getData();
1286                                 }
1287
1288                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1289                                         $val = '31-12-2030 12:00:00.000000';
1290                                 }
1291
1292                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1293                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1294                                         $e = oci_error( $stmt );
1295                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1296
1297                                         return false;
1298                                 }
1299                         } else {
1300                                 /** @var OCI_Lob[] $lob */
1301                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1302                                 if ( $lob[$col] === false ) {
1303                                         $e = oci_error( $stmt );
1304                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1305                                 }
1306
1307                                 if ( is_object( $val ) ) {
1308                                         $val = $val->getData();
1309                                 }
1310
1311                                 if ( $col_type == 'BLOB' ) {
1312                                         $lob[$col]->writeTemporary( $val );
1313                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1314                                 } else {
1315                                         $lob[$col]->writeTemporary( $val );
1316                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1317                                 }
1318                         }
1319                 }
1320
1321                 MediaWiki\suppressWarnings();
1322
1323                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1324                         $e = oci_error( $stmt );
1325                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1326                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1327
1328                                 return false;
1329                         } else {
1330                                 $this->mAffectedRows = oci_num_rows( $stmt );
1331                         }
1332                 } else {
1333                         $this->mAffectedRows = oci_num_rows( $stmt );
1334                 }
1335
1336                 MediaWiki\restoreWarnings();
1337
1338                 if ( isset( $lob ) ) {
1339                         foreach ( $lob as $lob_v ) {
1340                                 $lob_v->free();
1341                         }
1342                 }
1343
1344                 if ( !$this->mTrxLevel ) {
1345                         oci_commit( $this->mConn );
1346                 }
1347
1348                 return oci_free_statement( $stmt );
1349         }
1350
1351         function bitNot( $field ) {
1352                 // expecting bit-fields smaller than 4bytes
1353                 return 'BITNOT(' . $field . ')';
1354         }
1355
1356         function bitAnd( $fieldLeft, $fieldRight ) {
1357                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1358         }
1359
1360         function bitOr( $fieldLeft, $fieldRight ) {
1361                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1362         }
1363
1364         function getDBname() {
1365                 return $this->mDBname;
1366         }
1367
1368         function getServer() {
1369                 return $this->mServer;
1370         }
1371
1372         public function buildGroupConcatField(
1373                 $delim, $table, $field, $conds = '', $join_conds = []
1374         ) {
1375                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1376
1377                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1378         }
1379
1380         /**
1381          * @param string $field Field or column to cast
1382          * @return string
1383          * @since 1.28
1384          */
1385         public function buildStringCast( $field ) {
1386                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1387         }
1388
1389         public function getInfinity() {
1390                 return '31-12-2030 12:00:00.000000';
1391         }
1392 }