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
  28 /**
  29  * @ingroup Database
  30  */
  31 class DatabaseOracle extends Database {
  32         /** @var resource */
  33         protected $mLastResult = null;
  34
  35         /** @var int The number of rows affected as an integer */
  36         protected $mAffectedRows;
  37
  38         /** @var int */
  39         private $mInsertId = null;
  40
  41         /** @var bool */
  42         private $ignoreDupValOnIndex = false;
  43
  44         /** @var bool|array */
  45         private $sequenceData = null;
  46
  47         /** @var string Character set for Oracle database */
  48         private $defaultCharset = 'AL32UTF8';
  49
  50         /** @var array */
  51         private $mFieldInfoCache = [];
  52
  53         function __construct( array $p ) {
  54                 global $wgDBprefix;
  55
  56                 if ( $p['tablePrefix'] == 'get from global' ) {
  57                         $p['tablePrefix'] = $wgDBprefix;
  58                 }
  59                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  60                 parent::__construct( $p );
  61                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  62         }
  63
  64         function __destruct() {
  65                 if ( $this->mOpened ) {
  66                         MediaWiki\suppressWarnings();
  67                         $this->close();
  68                         MediaWiki\restoreWarnings();
  69                 }
  70         }
  71
  72         function getType() {
  73                 return 'oracle';
  74         }
  75
  76         function implicitGroupby() {
  77                 return false;
  78         }
  79
  80         function implicitOrderby() {
  81                 return false;
  82         }
  83
  84         /**
  85          * Usually aborts on failure
  86          * @param string $server
  87          * @param string $user
  88          * @param string $password
  89          * @param string $dbName
  90          * @throws DBConnectionError
  91          * @return resource|null
  92          */
  93         function open( $server, $user, $password, $dbName ) {
  94                 global $wgDBOracleDRCP;
  95                 if ( !function_exists( 'oci_connect' ) ) {
  96                         throw new DBConnectionError(
  97                                 $this,
  98                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  99                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 100                                         "and database)\n" );
 101                 }
 102
 103                 $this->close();
 104                 $this->mUser = $user;
 105                 $this->mPassword = $password;
 106                 // changed internal variables functions
 107                 // mServer now holds the TNS endpoint
 108                 // mDBname is schema name if different from username
 109                 if ( !$server ) {
 110                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 111                         $this->mServer = $dbName;
 112                         $this->mDBname = $user;
 113                 } else {
 114                         $this->mServer = $server;
 115                         if ( !$dbName ) {
 116                                 $this->mDBname = $user;
 117                         } else {
 118                                 $this->mDBname = $dbName;
 119                         }
 120                 }
 121
 122                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 123                         return null;
 124                 }
 125
 126                 if ( $wgDBOracleDRCP ) {
 127                         $this->setFlag( DBO_PERSISTENT );
 128                 }
 129
 130                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 131
 132                 MediaWiki\suppressWarnings();
 133                 if ( $this->mFlags & DBO_PERSISTENT ) {
 134                         $this->mConn = oci_pconnect(
 135                                 $this->mUser,
 136                                 $this->mPassword,
 137                                 $this->mServer,
 138                                 $this->defaultCharset,
 139                                 $session_mode
 140                         );
 141                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 142                         $this->mConn = oci_new_connect(
 143                                 $this->mUser,
 144                                 $this->mPassword,
 145                                 $this->mServer,
 146                                 $this->defaultCharset,
 147                                 $session_mode
 148                         );
 149                 } else {
 150                         $this->mConn = oci_connect(
 151                                 $this->mUser,
 152                                 $this->mPassword,
 153                                 $this->mServer,
 154                                 $this->defaultCharset,
 155                                 $session_mode
 156                         );
 157                 }
 158                 MediaWiki\restoreWarnings();
 159
 160                 if ( $this->mUser != $this->mDBname ) {
 161                         // change current schema in session
 162                         $this->selectDB( $this->mDBname );
 163                 }
 164
 165                 if ( !$this->mConn ) {
 166                         throw new DBConnectionError( $this, $this->lastError() );
 167                 }
 168
 169                 $this->mOpened = true;
 170
 171                 # removed putenv calls because they interfere with the system globaly
 172                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 173                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 174                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 175
 176                 return $this->mConn;
 177         }
 178
 179         /**
 180          * Closes a database connection, if it is open
 181          * Returns success, true if already closed
 182          * @return bool
 183          */
 184         protected function closeConnection() {
 185                 return oci_close( $this->mConn );
 186         }
 187
 188         function execFlags() {
 189                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 190         }
 191
 192         protected function doQuery( $sql ) {
 193                 wfDebug( "SQL: [$sql]\n" );
 194                 if ( !StringUtils::isUtf8( $sql ) ) {
 195                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 196                 }
 197
 198                 // handle some oracle specifics
 199                 // remove AS column/table/subquery namings
 200                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 201                         $sql = preg_replace( '/ as /i', ' ', $sql );
 202                 }
 203
 204                 // Oracle has issues with UNION clause if the statement includes LOB fields
 205                 // So we do a UNION ALL and then filter the results array with array_unique
 206                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 207                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 208                 // you have to select data from plan table after explain
 209                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 210
 211                 $sql = preg_replace(
 212                         '/^EXPLAIN /',
 213                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 214                         $sql,
 215                         1,
 216                         $explain_count
 217                 );
 218
 219                 MediaWiki\suppressWarnings();
 220
 221                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 222                 if ( $stmt === false ) {
 223                         $e = oci_error( $this->mConn );
 224                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 225
 226                         return false;
 227                 }
 228
 229                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 230                         $e = oci_error( $stmt );
 231                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 232                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 233
 234                                 return false;
 235                         }
 236                 }
 237
 238                 MediaWiki\restoreWarnings();
 239
 240                 if ( $explain_count > 0 ) {
 241                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 242                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 243                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 244                         return new ORAResult( $this, $stmt, $union_unique );
 245                 } else {
 246                         $this->mAffectedRows = oci_num_rows( $stmt );
 247
 248                         return true;
 249                 }
 250         }
 251
 252         function queryIgnore( $sql, $fname = '' ) {
 253                 return $this->query( $sql, $fname, true );
 254         }
 255
 256         /**
 257          * Frees resources associated with the LOB descriptor
 258          * @param ResultWrapper|ORAResult $res
 259          */
 260         function freeResult( $res ) {
 261                 if ( $res instanceof ResultWrapper ) {
 262                         $res = $res->result;
 263                 }
 264
 265                 $res->free();
 266         }
 267
 268         /**
 269          * @param ResultWrapper|ORAResult $res
 270          * @return mixed
 271          */
 272         function fetchObject( $res ) {
 273                 if ( $res instanceof ResultWrapper ) {
 274                         $res = $res->result;
 275                 }
 276
 277                 return $res->fetchObject();
 278         }
 279
 280         /**
 281          * @param ResultWrapper|ORAResult $res
 282          * @return mixed
 283          */
 284         function fetchRow( $res ) {
 285                 if ( $res instanceof ResultWrapper ) {
 286                         $res = $res->result;
 287                 }
 288
 289                 return $res->fetchRow();
 290         }
 291
 292         /**
 293          * @param ResultWrapper|ORAResult $res
 294          * @return int
 295          */
 296         function numRows( $res ) {
 297                 if ( $res instanceof ResultWrapper ) {
 298                         $res = $res->result;
 299                 }
 300
 301                 return $res->numRows();
 302         }
 303
 304         /**
 305          * @param ResultWrapper|ORAResult $res
 306          * @return int
 307          */
 308         function numFields( $res ) {
 309                 if ( $res instanceof ResultWrapper ) {
 310                         $res = $res->result;
 311                 }
 312
 313                 return $res->numFields();
 314         }
 315
 316         function fieldName( $stmt, $n ) {
 317                 return oci_field_name( $stmt, $n );
 318         }
 319
 320         /**
 321          * This must be called after nextSequenceVal
 322          * @return null|int
 323          */
 324         function insertId() {
 325                 return $this->mInsertId;
 326         }
 327
 328         /**
 329          * @param mixed $res
 330          * @param int $row
 331          */
 332         function dataSeek( $res, $row ) {
 333                 if ( $res instanceof ORAResult ) {
 334                         $res->seek( $row );
 335                 } else {
 336                         $res->result->seek( $row );
 337                 }
 338         }
 339
 340         function lastError() {
 341                 if ( $this->mConn === false ) {
 342                         $e = oci_error();
 343                 } else {
 344                         $e = oci_error( $this->mConn );
 345                 }
 346
 347                 return $e['message'];
 348         }
 349
 350         function lastErrno() {
 351                 if ( $this->mConn === false ) {
 352                         $e = oci_error();
 353                 } else {
 354                         $e = oci_error( $this->mConn );
 355                 }
 356
 357                 return $e['code'];
 358         }
 359
 360         function affectedRows() {
 361                 return $this->mAffectedRows;
 362         }
 363
 364         /**
 365          * Returns information about an index
 366          * If errors are explicitly ignored, returns NULL on failure
 367          * @param string $table
 368          * @param string $index
 369          * @param string $fname
 370          * @return bool
 371          */
 372         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 373                 return false;
 374         }
 375
 376         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 377                 return false;
 378         }
 379
 380         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 381                 if ( !count( $a ) ) {
 382                         return true;
 383                 }
 384
 385                 if ( !is_array( $options ) ) {
 386                         $options = [ $options ];
 387                 }
 388
 389                 if ( in_array( 'IGNORE', $options ) ) {
 390                         $this->ignoreDupValOnIndex = true;
 391                 }
 392
 393                 if ( !is_array( reset( $a ) ) ) {
 394                         $a = [ $a ];
 395                 }
 396
 397                 foreach ( $a as &$row ) {
 398                         $this->insertOneRow( $table, $row, $fname );
 399                 }
 400                 $retVal = true;
 401
 402                 if ( in_array( 'IGNORE', $options ) ) {
 403                         $this->ignoreDupValOnIndex = false;
 404                 }
 405
 406                 return $retVal;
 407         }
 408
 409         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 410                 $col_info = $this->fieldInfoMulti( $table, $col );
 411                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 412
 413                 $bind = '';
 414                 if ( is_numeric( $col ) ) {
 415                         $bind = $val;
 416                         $val = null;
 417
 418                         return $bind;
 419                 } elseif ( $includeCol ) {
 420                         $bind = "$col = ";
 421                 }
 422
 423                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 424                         $val = null;
 425                 }
 426
 427                 if ( $val === 'NULL' ) {
 428                         $val = null;
 429                 }
 430
 431                 if ( $val === null ) {
 432                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 433                                 $bind .= 'DEFAULT';
 434                         } else {
 435                                 $bind .= 'NULL';
 436                         }
 437                 } else {
 438                         $bind .= ':' . $col;
 439                 }
 440
 441                 return $bind;
 442         }
 443
 444         /**
 445          * @param string $table
 446          * @param array $row
 447          * @param string $fname
 448          * @return bool
 449          * @throws DBUnexpectedError
 450          */
 451         private function insertOneRow( $table, $row, $fname ) {
 452                 global $wgContLang;
 453
 454                 $table = $this->tableName( $table );
 455                 // "INSERT INTO tables (a, b, c)"
 456                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 457                 $sql .= " VALUES (";
 458
 459                 // for each value, append ":key"
 460                 $first = true;
 461                 foreach ( $row as $col => &$val ) {
 462                         if ( !$first ) {
 463                                 $sql .= ', ';
 464                         } else {
 465                                 $first = false;
 466                         }
 467                         if ( $this->isQuotedIdentifier( $val ) ) {
 468                                 $sql .= $this->removeIdentifierQuotes( $val );
 469                                 unset( $row[$col] );
 470                         } else {
 471                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 472                         }
 473                 }
 474                 $sql .= ')';
 475
 476                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 477                 if ( $stmt === false ) {
 478                         $e = oci_error( $this->mConn );
 479                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 480
 481                         return false;
 482                 }
 483                 foreach ( $row as $col => &$val ) {
 484                         $col_info = $this->fieldInfoMulti( $table, $col );
 485                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 486
 487                         if ( $val === null ) {
 488                                 // do nothing ... null was inserted in statement creation
 489                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 490                                 if ( is_object( $val ) ) {
 491                                         $val = $val->fetch();
 492                                 }
 493
 494                                 // backward compatibility
 495                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 496                                         $val = $this->getInfinity();
 497                                 }
 498
 499                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 500                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 501                                         $e = oci_error( $stmt );
 502                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 503
 504                                         return false;
 505                                 }
 506                         } else {
 507                                 /** @var OCI_Lob[] $lob */
 508                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
 509                                 if ( $lob[$col] === false ) {
 510                                         $e = oci_error( $stmt );
 511                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 512                                 }
 513
 514                                 if ( is_object( $val ) ) {
 515                                         $val = $val->fetch();
 516                                 }
 517
 518                                 if ( $col_type == 'BLOB' ) {
 519                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 520                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 521                                 } else {
 522                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 523                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 524                                 }
 525                         }
 526                 }
 527
 528                 MediaWiki\suppressWarnings();
 529
 530                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 531                         $e = oci_error( $stmt );
 532                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 533                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 534
 535                                 return false;
 536                         } else {
 537                                 $this->mAffectedRows = oci_num_rows( $stmt );
 538                         }
 539                 } else {
 540                         $this->mAffectedRows = oci_num_rows( $stmt );
 541                 }
 542
 543                 MediaWiki\restoreWarnings();
 544
 545                 if ( isset( $lob ) ) {
 546                         foreach ( $lob as $lob_v ) {
 547                                 $lob_v->free();
 548                         }
 549                 }
 550
 551                 if ( !$this->mTrxLevel ) {
 552                         oci_commit( $this->mConn );
 553                 }
 554
 555                 return oci_free_statement( $stmt );
 556         }
 557
 558         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 559                 $insertOptions = [], $selectOptions = []
 560         ) {
 561                 $destTable = $this->tableName( $destTable );
 562                 if ( !is_array( $selectOptions ) ) {
 563                         $selectOptions = [ $selectOptions ];
 564                 }
 565                 list( $startOpts, $useIndex, $tailOpts, $ignoreIndex ) =
 566                         $this->makeSelectOptions( $selectOptions );
 567                 if ( is_array( $srcTable ) ) {
 568                         $srcTable = implode( ',', array_map( [ $this, 'tableName' ], $srcTable ) );
 569                 } else {
 570                         $srcTable = $this->tableName( $srcTable );
 571                 }
 572
 573                 $sequenceData = $this->getSequenceData( $destTable );
 574                 if ( $sequenceData !== false &&
 575                         !isset( $varMap[$sequenceData['column']] )
 576                 ) {
 577                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 578                 }
 579
 580                 // count-alias subselect fields to avoid abigious definition errors
 581                 $i = 0;
 582                 foreach ( $varMap as &$val ) {
 583                         $val = $val . ' field' . ( $i++ );
 584                 }
 585
 586                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 587                         " SELECT $startOpts " . implode( ',', $varMap ) .
 588                         " FROM $srcTable $useIndex $ignoreIndex ";
 589                 if ( $conds != '*' ) {
 590                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 591                 }
 592                 $sql .= " $tailOpts";
 593
 594                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 595                         $this->ignoreDupValOnIndex = true;
 596                 }
 597
 598                 $retval = $this->query( $sql, $fname );
 599
 600                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 601                         $this->ignoreDupValOnIndex = false;
 602                 }
 603
 604                 return $retval;
 605         }
 606
 607         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 608                 $fname = __METHOD__
 609         ) {
 610                 if ( !count( $rows ) ) {
 611                         return true; // nothing to do
 612                 }
 613
 614                 if ( !is_array( reset( $rows ) ) ) {
 615                         $rows = [ $rows ];
 616                 }
 617
 618                 $sequenceData = $this->getSequenceData( $table );
 619                 if ( $sequenceData !== false ) {
 620                         // add sequence column to each list of columns, when not set
 621                         foreach ( $rows as &$row ) {
 622                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 623                                         $row[$sequenceData['column']] =
 624                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 625                                                         $sequenceData['sequence'] . '\')' );
 626                                 }
 627                         }
 628                 }
 629
 630                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 631         }
 632
 633         function tableName( $name, $format = 'quoted' ) {
 634                 /*
 635                 Replace reserved words with better ones
 636                 Using uppercase because that's the only way Oracle can handle
 637                 quoted tablenames
 638                 */
 639                 switch ( $name ) {
 640                         case 'user':
 641                                 $name = 'MWUSER';
 642                                 break;
 643                         case 'text':
 644                                 $name = 'PAGECONTENT';
 645                                 break;
 646                 }
 647
 648                 return strtoupper( parent::tableName( $name, $format ) );
 649         }
 650
 651         function tableNameInternal( $name ) {
 652                 $name = $this->tableName( $name );
 653
 654                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 655         }
 656
 657         /**
 658          * Return the next in a sequence, save the value for retrieval via insertId()
 659          *
 660          * @param string $seqName
 661          * @return null|int
 662          */
 663         function nextSequenceValue( $seqName ) {
 664                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 665                 $row = $this->fetchRow( $res );
 666                 $this->mInsertId = $row[0];
 667
 668                 return $this->mInsertId;
 669         }
 670
 671         /**
 672          * Return sequence_name if table has a sequence
 673          *
 674          * @param string $table
 675          * @return bool
 676          */
 677         private function getSequenceData( $table ) {
 678                 if ( $this->sequenceData == null ) {
 679                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 680                                 lower(atc.table_name),
 681                                 lower(atc.column_name)
 682                         FROM all_sequences asq, all_tab_columns atc
 683                         WHERE decode(
 684                                         atc.table_name,
 685                                         '{$this->mTablePrefix}MWUSER',
 686                                         '{$this->mTablePrefix}USER',
 687                                         atc.table_name
 688                                 ) || '_' ||
 689                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 690                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 691                                 AND atc.owner = upper('{$this->mDBname}')" );
 692
 693                         while ( ( $row = $result->fetchRow() ) !== false ) {
 694                                 $this->sequenceData[$row[1]] = [
 695                                         'sequence' => $row[0],
 696                                         'column' => $row[2]
 697                                 ];
 698                         }
 699                 }
 700                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 701
 702                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 703         }
 704
 705         /**
 706          * Returns the size of a text field, or -1 for "unlimited"
 707          *
 708          * @param string $table
 709          * @param string $field
 710          * @return mixed
 711          */
 712         function textFieldSize( $table, $field ) {
 713                 $fieldInfoData = $this->fieldInfo( $table, $field );
 714
 715                 return $fieldInfoData->maxLength();
 716         }
 717
 718         function limitResult( $sql, $limit, $offset = false ) {
 719                 if ( $offset === false ) {
 720                         $offset = 0;
 721                 }
 722
 723                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 724         }
 725
 726         function encodeBlob( $b ) {
 727                 return new Blob( $b );
 728         }
 729
 730         function decodeBlob( $b ) {
 731                 if ( $b instanceof Blob ) {
 732                         $b = $b->fetch();
 733                 }
 734
 735                 return $b;
 736         }
 737
 738         function unionQueries( $sqls, $all ) {
 739                 $glue = ' UNION ALL ';
 740
 741                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 742                         'FROM (' . implode( $glue, $sqls ) . ')';
 743         }
 744
 745         function wasDeadlock() {
 746                 return $this->lastErrno() == 'OCI-00060';
 747         }
 748
 749         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 750                 $fname = __METHOD__
 751         ) {
 752                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 753
 754                 $newName = strtoupper( $newName );
 755                 $oldName = strtoupper( $oldName );
 756
 757                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 758                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 759                 $newPrefix = strtoupper( $this->mTablePrefix );
 760
 761                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 762                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 763         }
 764
 765         function listTables( $prefix = null, $fname = __METHOD__ ) {
 766                 $listWhere = '';
 767                 if ( !empty( $prefix ) ) {
 768                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 769                 }
 770
 771                 $owner = strtoupper( $this->mDBname );
 772                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 773                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 774
 775                 // dirty code ... i know
 776                 $endArray = [];
 777                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 778                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 779                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 780                 $fixedOrderTabs = $endArray;
 781                 while ( ( $row = $result->fetchRow() ) !== false ) {
 782                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 783                                 $endArray[] = $row['table_name'];
 784                         }
 785                 }
 786
 787                 return $endArray;
 788         }
 789
 790         public function dropTable( $tableName, $fName = __METHOD__ ) {
 791                 $tableName = $this->tableName( $tableName );
 792                 if ( !$this->tableExists( $tableName ) ) {
 793                         return false;
 794                 }
 795
 796                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 797         }
 798
 799         function timestamp( $ts = 0 ) {
 800                 return wfTimestamp( TS_ORACLE, $ts );
 801         }
 802
 803         /**
 804          * Return aggregated value function call
 805          *
 806          * @param array $valuedata
 807          * @param string $valuename
 808          * @return mixed
 809          */
 810         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 811                 return $valuedata;
 812         }
 813
 814         /**
 815          * @return string Wikitext of a link to the server software's web site
 816          */
 817         public function getSoftwareLink() {
 818                 return '[{{int:version-db-oracle-url}} Oracle]';
 819         }
 820
 821         /**
 822          * @return string Version information from the database
 823          */
 824         function getServerVersion() {
 825                 // better version number, fallback on driver
 826                 $rset = $this->doQuery(
 827                         'SELECT version FROM product_component_version ' .
 828                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 829                 );
 830                 $row = $rset->fetchRow();
 831                 if ( !$row ) {
 832                         return oci_server_version( $this->mConn );
 833                 }
 834
 835                 return $row['version'];
 836         }
 837
 838         /**
 839          * Query whether a given index exists
 840          * @param string $table
 841          * @param string $index
 842          * @param string $fname
 843          * @return bool
 844          */
 845         function indexExists( $table, $index, $fname = __METHOD__ ) {
 846                 $table = $this->tableName( $table );
 847                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 848                 $index = strtoupper( $index );
 849                 $owner = strtoupper( $this->mDBname );
 850                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 851                 $res = $this->doQuery( $sql );
 852                 if ( $res ) {
 853                         $count = $res->numRows();
 854                         $res->free();
 855                 } else {
 856                         $count = 0;
 857                 }
 858
 859                 return $count != 0;
 860         }
 861
 862         /**
 863          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 864          * @param string $table
 865          * @param string $fname
 866          * @return bool
 867          */
 868         function tableExists( $table, $fname = __METHOD__ ) {
 869                 $table = $this->tableName( $table );
 870                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 871                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 872                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 873                 $res = $this->doQuery( $sql );
 874                 if ( $res && $res->numRows() > 0 ) {
 875                         $exists = true;
 876                 } else {
 877                         $exists = false;
 878                 }
 879
 880                 $res->free();
 881
 882                 return $exists;
 883         }
 884
 885         /**
 886          * Function translates mysql_fetch_field() functionality on ORACLE.
 887          * Caching is present for reducing query time.
 888          * For internal calls. Use fieldInfo for normal usage.
 889          * Returns false if the field doesn't exist
 890          *
 891          * @param array|string $table
 892          * @param string $field
 893          * @return ORAField|ORAResult|false
 894          */
 895         private function fieldInfoMulti( $table, $field ) {
 896                 $field = strtoupper( $field );
 897                 if ( is_array( $table ) ) {
 898                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 899                         $tableWhere = 'IN (';
 900                         foreach ( $table as &$singleTable ) {
 901                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 902                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 903                                         return $this->mFieldInfoCache["$singleTable.$field"];
 904                                 }
 905                                 $tableWhere .= '\'' . $singleTable . '\',';
 906                         }
 907                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 908                 } else {
 909                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 910                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 911                                 return $this->mFieldInfoCache["$table.$field"];
 912                         }
 913                         $tableWhere = '= \'' . $table . '\'';
 914                 }
 915
 916                 $fieldInfoStmt = oci_parse(
 917                         $this->mConn,
 918                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 919                                 $tableWhere . ' and column_name = \'' . $field . '\''
 920                 );
 921                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 922                         $e = oci_error( $fieldInfoStmt );
 923                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 924
 925                         return false;
 926                 }
 927                 $res = new ORAResult( $this, $fieldInfoStmt );
 928                 if ( $res->numRows() == 0 ) {
 929                         if ( is_array( $table ) ) {
 930                                 foreach ( $table as &$singleTable ) {
 931                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 932                                 }
 933                         } else {
 934                                 $this->mFieldInfoCache["$table.$field"] = false;
 935                         }
 936                         $fieldInfoTemp = null;
 937                 } else {
 938                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 939                         $table = $fieldInfoTemp->tableName();
 940                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 941                 }
 942                 $res->free();
 943
 944                 return $fieldInfoTemp;
 945         }
 946
 947         /**
 948          * @throws DBUnexpectedError
 949          * @param string $table
 950          * @param string $field
 951          * @return ORAField
 952          */
 953         function fieldInfo( $table, $field ) {
 954                 if ( is_array( $table ) ) {
 955                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 956                 }
 957
 958                 return $this->fieldInfoMulti( $table, $field );
 959         }
 960
 961         protected function doBegin( $fname = __METHOD__ ) {
 962                 $this->mTrxLevel = 1;
 963                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 964         }
 965
 966         protected function doCommit( $fname = __METHOD__ ) {
 967                 if ( $this->mTrxLevel ) {
 968                         $ret = oci_commit( $this->mConn );
 969                         if ( !$ret ) {
 970                                 throw new DBUnexpectedError( $this, $this->lastError() );
 971                         }
 972                         $this->mTrxLevel = 0;
 973                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 974                 }
 975         }
 976
 977         protected function doRollback( $fname = __METHOD__ ) {
 978                 if ( $this->mTrxLevel ) {
 979                         oci_rollback( $this->mConn );
 980                         $this->mTrxLevel = 0;
 981                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 982                 }
 983         }
 984
 985         function sourceStream(
 986                 $fp,
 987                 callable $lineCallback = null,
 988                 callable $resultCallback = null,
 989                 $fname = __METHOD__, callable $inputCallback = null
 990         ) {
 991                 $cmd = '';
 992                 $done = false;
 993                 $dollarquote = false;
 994
 995                 $replacements = [];
 996                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 997                 while ( !feof( $fp ) ) {
 998                         if ( $lineCallback ) {
 999                                 call_user_func( $lineCallback );
1000                         }
1001                         $line = trim( fgets( $fp, 1024 ) );
1002                         $sl = strlen( $line ) - 1;
1003
1004                         if ( $sl < 0 ) {
1005                                 continue;
1006                         }
1007                         if ( '-' == $line[0] && '-' == $line[1] ) {
1008                                 continue;
1009                         }
1010
1011                         // Allow dollar quoting for function declarations
1012                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1013                                 if ( $dollarquote ) {
1014                                         $dollarquote = false;
1015                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1016                                         $done = true;
1017                                 } else {
1018                                         $dollarquote = true;
1019                                 }
1020                         } elseif ( !$dollarquote ) {
1021                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1022                                         $done = true;
1023                                         $line = substr( $line, 0, $sl );
1024                                 }
1025                         }
1026
1027                         if ( $cmd != '' ) {
1028                                 $cmd .= ' ';
1029                         }
1030                         $cmd .= "$line\n";
1031
1032                         if ( $done ) {
1033                                 $cmd = str_replace( ';;', ";", $cmd );
1034                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1035                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1036                                                 $replacements[$defines[2]] = $defines[1];
1037                                         }
1038                                 } else {
1039                                         foreach ( $replacements as $mwVar => $scVar ) {
1040                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1041                                         }
1042
1043                                         $cmd = $this->replaceVars( $cmd );
1044                                         if ( $inputCallback ) {
1045                                                 call_user_func( $inputCallback, $cmd );
1046                                         }
1047                                         $res = $this->doQuery( $cmd );
1048                                         if ( $resultCallback ) {
1049                                                 call_user_func( $resultCallback, $res, $this );
1050                                         }
1051
1052                                         if ( false === $res ) {
1053                                                 $err = $this->lastError();
1054
1055                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1056                                         }
1057                                 }
1058
1059                                 $cmd = '';
1060                                 $done = false;
1061                         }
1062                 }
1063
1064                 return true;
1065         }
1066
1067         function selectDB( $db ) {
1068                 $this->mDBname = $db;
1069                 if ( $db == null || $db == $this->mUser ) {
1070                         return true;
1071                 }
1072                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1073                 $stmt = oci_parse( $this->mConn, $sql );
1074                 MediaWiki\suppressWarnings();
1075                 $success = oci_execute( $stmt );
1076                 MediaWiki\restoreWarnings();
1077                 if ( !$success ) {
1078                         $e = oci_error( $stmt );
1079                         if ( $e['code'] != '1435' ) {
1080                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1081                         }
1082
1083                         return false;
1084                 }
1085
1086                 return true;
1087         }
1088
1089         function strencode( $s ) {
1090                 return str_replace( "'", "''", $s );
1091         }
1092
1093         function addQuotes( $s ) {
1094                 global $wgContLang;
1095                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1096                         $s = $wgContLang->checkTitleEncoding( $s );
1097                 }
1098
1099                 return "'" . $this->strencode( $s ) . "'";
1100         }
1101
1102         public function addIdentifierQuotes( $s ) {
1103                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1104                         $s = '/*Q*/' . $s;
1105                 }
1106
1107                 return $s;
1108         }
1109
1110         public function removeIdentifierQuotes( $s ) {
1111                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1112         }
1113
1114         public function isQuotedIdentifier( $s ) {
1115                 return strpos( $s, '/*Q*/' ) !== false;
1116         }
1117
1118         private function wrapFieldForWhere( $table, &$col, &$val ) {
1119                 global $wgContLang;
1120
1121                 $col_info = $this->fieldInfoMulti( $table, $col );
1122                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1123                 if ( $col_type == 'CLOB' ) {
1124                         $col = 'TO_CHAR(' . $col . ')';
1125                         $val = $wgContLang->checkTitleEncoding( $val );
1126                 } elseif ( $col_type == 'VARCHAR2' ) {
1127                         $val = $wgContLang->checkTitleEncoding( $val );
1128                 }
1129         }
1130
1131         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1132                 $conds2 = [];
1133                 foreach ( $conds as $col => $val ) {
1134                         if ( is_array( $val ) ) {
1135                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1136                         } else {
1137                                 if ( is_numeric( $col ) && $parentCol != null ) {
1138                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1139                                 } else {
1140                                         $this->wrapFieldForWhere( $table, $col, $val );
1141                                 }
1142                                 $conds2[$col] = $val;
1143                         }
1144                 }
1145
1146                 return $conds2;
1147         }
1148
1149         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1150                 $options = [], $join_conds = []
1151         ) {
1152                 if ( is_array( $conds ) ) {
1153                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1154                 }
1155
1156                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1157         }
1158
1159         /**
1160          * Returns an optional USE INDEX clause to go after the table, and a
1161          * string to go at the end of the query
1162          *
1163          * @param array $options An associative array of options to be turned into
1164          *   an SQL query, valid keys are listed in the function.
1165          * @return array
1166          */
1167         function makeSelectOptions( $options ) {
1168                 $preLimitTail = $postLimitTail = '';
1169                 $startOpts = '';
1170
1171                 $noKeyOptions = [];
1172                 foreach ( $options as $key => $option ) {
1173                         if ( is_numeric( $key ) ) {
1174                                 $noKeyOptions[$option] = true;
1175                         }
1176                 }
1177
1178                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1179
1180                 $preLimitTail .= $this->makeOrderBy( $options );
1181
1182                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1183                         $postLimitTail .= ' FOR UPDATE';
1184                 }
1185
1186                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1187                         $startOpts .= 'DISTINCT';
1188                 }
1189
1190                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1191                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1192                 } else {
1193                         $useIndex = '';
1194                 }
1195
1196                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1197                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1198                 } else {
1199                         $ignoreIndex = '';
1200                 }
1201
1202                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1203         }
1204
1205         public function delete( $table, $conds, $fname = __METHOD__ ) {
1206                 if ( is_array( $conds ) ) {
1207                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1208                 }
1209                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1210                 // all deletions on these tables have transactions so final failure rollbacks these updates
1211                 $table = $this->tableName( $table );
1212                 if ( $table == $this->tableName( 'user' ) ) {
1213                         $this->update( 'archive', [ 'ar_user' => 0 ],
1214                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1215                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1216                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1217                         $this->update( 'image', [ 'img_user' => 0 ],
1218                                 [ 'img_user' => $conds['user_id'] ], $fname );
1219                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1220                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1221                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1222                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1223                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1224                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1225                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1226                                 [ 'us_user' => $conds['user_id'] ], $fname );
1227                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1228                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1229                         $this->update( 'logging', [ 'log_user' => 0 ],
1230                                 [ 'log_user' => $conds['user_id'] ], $fname );
1231                 } elseif ( $table == $this->tableName( 'image' ) ) {
1232                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1233                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1234                 }
1235
1236                 return parent::delete( $table, $conds, $fname );
1237         }
1238
1239         /**
1240          * @param string $table
1241          * @param array $values
1242          * @param array $conds
1243          * @param string $fname
1244          * @param array $options
1245          * @return bool
1246          * @throws DBUnexpectedError
1247          */
1248         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1249                 global $wgContLang;
1250
1251                 $table = $this->tableName( $table );
1252                 $opts = $this->makeUpdateOptions( $options );
1253                 $sql = "UPDATE $opts $table SET ";
1254
1255                 $first = true;
1256                 foreach ( $values as $col => &$val ) {
1257                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1258
1259                         if ( !$first ) {
1260                                 $sqlSet = ', ' . $sqlSet;
1261                         } else {
1262                                 $first = false;
1263                         }
1264                         $sql .= $sqlSet;
1265                 }
1266
1267                 if ( $conds !== [] && $conds !== '*' ) {
1268                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1269                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1270                 }
1271
1272                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1273                 if ( $stmt === false ) {
1274                         $e = oci_error( $this->mConn );
1275                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1276
1277                         return false;
1278                 }
1279                 foreach ( $values as $col => &$val ) {
1280                         $col_info = $this->fieldInfoMulti( $table, $col );
1281                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1282
1283                         if ( $val === null ) {
1284                                 // do nothing ... null was inserted in statement creation
1285                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1286                                 if ( is_object( $val ) ) {
1287                                         $val = $val->getData();
1288                                 }
1289
1290                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1291                                         $val = '31-12-2030 12:00:00.000000';
1292                                 }
1293
1294                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1295                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1296                                         $e = oci_error( $stmt );
1297                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1298
1299                                         return false;
1300                                 }
1301                         } else {
1302                                 /** @var OCI_Lob[] $lob */
1303                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1304                                 if ( $lob[$col] === false ) {
1305                                         $e = oci_error( $stmt );
1306                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1307                                 }
1308
1309                                 if ( is_object( $val ) ) {
1310                                         $val = $val->getData();
1311                                 }
1312
1313                                 if ( $col_type == 'BLOB' ) {
1314                                         $lob[$col]->writeTemporary( $val );
1315                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1316                                 } else {
1317                                         $lob[$col]->writeTemporary( $val );
1318                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1319                                 }
1320                         }
1321                 }
1322
1323                 MediaWiki\suppressWarnings();
1324
1325                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1326                         $e = oci_error( $stmt );
1327                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1328                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1329
1330                                 return false;
1331                         } else {
1332                                 $this->mAffectedRows = oci_num_rows( $stmt );
1333                         }
1334                 } else {
1335                         $this->mAffectedRows = oci_num_rows( $stmt );
1336                 }
1337
1338                 MediaWiki\restoreWarnings();
1339
1340                 if ( isset( $lob ) ) {
1341                         foreach ( $lob as $lob_v ) {
1342                                 $lob_v->free();
1343                         }
1344                 }
1345
1346                 if ( !$this->mTrxLevel ) {
1347                         oci_commit( $this->mConn );
1348                 }
1349
1350                 return oci_free_statement( $stmt );
1351         }
1352
1353         function bitNot( $field ) {
1354                 // expecting bit-fields smaller than 4bytes
1355                 return 'BITNOT(' . $field . ')';
1356         }
1357
1358         function bitAnd( $fieldLeft, $fieldRight ) {
1359                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1360         }
1361
1362         function bitOr( $fieldLeft, $fieldRight ) {
1363                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1364         }
1365
1366         function getDBname() {
1367                 return $this->mDBname;
1368         }
1369
1370         function getServer() {
1371                 return $this->mServer;
1372         }
1373
1374         public function buildGroupConcatField(
1375                 $delim, $table, $field, $conds = '', $join_conds = []
1376         ) {
1377                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1378
1379                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1380         }
1381
1382         /**
1383          * @param string $field Field or column to cast
1384          * @return string
1385          * @since 1.28
1386          */
1387         public function buildStringCast( $field ) {
1388                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1389         }
1390
1391         public function getInfinity() {
1392                 return '31-12-2030 12:00:00.000000';
1393         }
1394 }