includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 use Wikimedia\Rdbms\Database;
  25 use Wikimedia\Rdbms\Blob;
  26 use Wikimedia\Rdbms\ResultWrapper;
  27 use Wikimedia\Rdbms\DBConnectionError;
  28 use Wikimedia\Rdbms\DBUnexpectedError;
  29
  30 /**
  31  * @ingroup Database
  32  */
  33 class DatabaseOracle extends Database {
  34         /** @var resource */
  35         protected $mLastResult = null;
  36
  37         /** @var int The number of rows affected as an integer */
  38         protected $mAffectedRows;
  39
  40         /** @var int */
  41         private $mInsertId = null;
  42
  43         /** @var bool */
  44         private $ignoreDupValOnIndex = false;
  45
  46         /** @var bool|array */
  47         private $sequenceData = null;
  48
  49         /** @var string Character set for Oracle database */
  50         private $defaultCharset = 'AL32UTF8';
  51
  52         /** @var array */
  53         private $mFieldInfoCache = [];
  54
  55         function __construct( array $p ) {
  56                 global $wgDBprefix;
  57
  58                 if ( $p['tablePrefix'] == 'get from global' ) {
  59                         $p['tablePrefix'] = $wgDBprefix;
  60                 }
  61                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  62                 parent::__construct( $p );
  63                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  64         }
  65
  66         function __destruct() {
  67                 if ( $this->mOpened ) {
  68                         MediaWiki\suppressWarnings();
  69                         $this->close();
  70                         MediaWiki\restoreWarnings();
  71                 }
  72         }
  73
  74         function getType() {
  75                 return 'oracle';
  76         }
  77
  78         function implicitGroupby() {
  79                 return false;
  80         }
  81
  82         function implicitOrderby() {
  83                 return false;
  84         }
  85
  86         /**
  87          * Usually aborts on failure
  88          * @param string $server
  89          * @param string $user
  90          * @param string $password
  91          * @param string $dbName
  92          * @throws DBConnectionError
  93          * @return resource|null
  94          */
  95         function open( $server, $user, $password, $dbName ) {
  96                 global $wgDBOracleDRCP;
  97                 if ( !function_exists( 'oci_connect' ) ) {
  98                         throw new DBConnectionError(
  99                                 $this,
 100                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 101                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 102                                         "and database)\n" );
 103                 }
 104
 105                 $this->close();
 106                 $this->mUser = $user;
 107                 $this->mPassword = $password;
 108                 // changed internal variables functions
 109                 // mServer now holds the TNS endpoint
 110                 // mDBname is schema name if different from username
 111                 if ( !$server ) {
 112                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 113                         $this->mServer = $dbName;
 114                         $this->mDBname = $user;
 115                 } else {
 116                         $this->mServer = $server;
 117                         if ( !$dbName ) {
 118                                 $this->mDBname = $user;
 119                         } else {
 120                                 $this->mDBname = $dbName;
 121                         }
 122                 }
 123
 124                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 125                         return null;
 126                 }
 127
 128                 if ( $wgDBOracleDRCP ) {
 129                         $this->setFlag( DBO_PERSISTENT );
 130                 }
 131
 132                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 133
 134                 MediaWiki\suppressWarnings();
 135                 if ( $this->mFlags & DBO_PERSISTENT ) {
 136                         $this->mConn = oci_pconnect(
 137                                 $this->mUser,
 138                                 $this->mPassword,
 139                                 $this->mServer,
 140                                 $this->defaultCharset,
 141                                 $session_mode
 142                         );
 143                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 144                         $this->mConn = oci_new_connect(
 145                                 $this->mUser,
 146                                 $this->mPassword,
 147                                 $this->mServer,
 148                                 $this->defaultCharset,
 149                                 $session_mode
 150                         );
 151                 } else {
 152                         $this->mConn = oci_connect(
 153                                 $this->mUser,
 154                                 $this->mPassword,
 155                                 $this->mServer,
 156                                 $this->defaultCharset,
 157                                 $session_mode
 158                         );
 159                 }
 160                 MediaWiki\restoreWarnings();
 161
 162                 if ( $this->mUser != $this->mDBname ) {
 163                         // change current schema in session
 164                         $this->selectDB( $this->mDBname );
 165                 }
 166
 167                 if ( !$this->mConn ) {
 168                         throw new DBConnectionError( $this, $this->lastError() );
 169                 }
 170
 171                 $this->mOpened = true;
 172
 173                 # removed putenv calls because they interfere with the system globaly
 174                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 175                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 176                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 177
 178                 return $this->mConn;
 179         }
 180
 181         /**
 182          * Closes a database connection, if it is open
 183          * Returns success, true if already closed
 184          * @return bool
 185          */
 186         protected function closeConnection() {
 187                 return oci_close( $this->mConn );
 188         }
 189
 190         function execFlags() {
 191                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 192         }
 193
 194         protected function doQuery( $sql ) {
 195                 wfDebug( "SQL: [$sql]\n" );
 196                 if ( !StringUtils::isUtf8( $sql ) ) {
 197                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 198                 }
 199
 200                 // handle some oracle specifics
 201                 // remove AS column/table/subquery namings
 202                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 203                         $sql = preg_replace( '/ as /i', ' ', $sql );
 204                 }
 205
 206                 // Oracle has issues with UNION clause if the statement includes LOB fields
 207                 // So we do a UNION ALL and then filter the results array with array_unique
 208                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 209                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 210                 // you have to select data from plan table after explain
 211                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 212
 213                 $sql = preg_replace(
 214                         '/^EXPLAIN /',
 215                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 216                         $sql,
 217                         1,
 218                         $explain_count
 219                 );
 220
 221                 MediaWiki\suppressWarnings();
 222
 223                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 224                 if ( $stmt === false ) {
 225                         $e = oci_error( $this->mConn );
 226                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 227
 228                         return false;
 229                 }
 230
 231                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 232                         $e = oci_error( $stmt );
 233                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 234                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 235
 236                                 return false;
 237                         }
 238                 }
 239
 240                 MediaWiki\restoreWarnings();
 241
 242                 if ( $explain_count > 0 ) {
 243                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 244                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 245                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 246                         return new ORAResult( $this, $stmt, $union_unique );
 247                 } else {
 248                         $this->mAffectedRows = oci_num_rows( $stmt );
 249
 250                         return true;
 251                 }
 252         }
 253
 254         function queryIgnore( $sql, $fname = '' ) {
 255                 return $this->query( $sql, $fname, true );
 256         }
 257
 258         /**
 259          * Frees resources associated with the LOB descriptor
 260          * @param ResultWrapper|ORAResult $res
 261          */
 262         function freeResult( $res ) {
 263                 if ( $res instanceof ResultWrapper ) {
 264                         $res = $res->result;
 265                 }
 266
 267                 $res->free();
 268         }
 269
 270         /**
 271          * @param ResultWrapper|ORAResult $res
 272          * @return mixed
 273          */
 274         function fetchObject( $res ) {
 275                 if ( $res instanceof ResultWrapper ) {
 276                         $res = $res->result;
 277                 }
 278
 279                 return $res->fetchObject();
 280         }
 281
 282         /**
 283          * @param ResultWrapper|ORAResult $res
 284          * @return mixed
 285          */
 286         function fetchRow( $res ) {
 287                 if ( $res instanceof ResultWrapper ) {
 288                         $res = $res->result;
 289                 }
 290
 291                 return $res->fetchRow();
 292         }
 293
 294         /**
 295          * @param ResultWrapper|ORAResult $res
 296          * @return int
 297          */
 298         function numRows( $res ) {
 299                 if ( $res instanceof ResultWrapper ) {
 300                         $res = $res->result;
 301                 }
 302
 303                 return $res->numRows();
 304         }
 305
 306         /**
 307          * @param ResultWrapper|ORAResult $res
 308          * @return int
 309          */
 310         function numFields( $res ) {
 311                 if ( $res instanceof ResultWrapper ) {
 312                         $res = $res->result;
 313                 }
 314
 315                 return $res->numFields();
 316         }
 317
 318         function fieldName( $stmt, $n ) {
 319                 return oci_field_name( $stmt, $n );
 320         }
 321
 322         /**
 323          * This must be called after nextSequenceVal
 324          * @return null|int
 325          */
 326         function insertId() {
 327                 return $this->mInsertId;
 328         }
 329
 330         /**
 331          * @param mixed $res
 332          * @param int $row
 333          */
 334         function dataSeek( $res, $row ) {
 335                 if ( $res instanceof ORAResult ) {
 336                         $res->seek( $row );
 337                 } else {
 338                         $res->result->seek( $row );
 339                 }
 340         }
 341
 342         function lastError() {
 343                 if ( $this->mConn === false ) {
 344                         $e = oci_error();
 345                 } else {
 346                         $e = oci_error( $this->mConn );
 347                 }
 348
 349                 return $e['message'];
 350         }
 351
 352         function lastErrno() {
 353                 if ( $this->mConn === false ) {
 354                         $e = oci_error();
 355                 } else {
 356                         $e = oci_error( $this->mConn );
 357                 }
 358
 359                 return $e['code'];
 360         }
 361
 362         function affectedRows() {
 363                 return $this->mAffectedRows;
 364         }
 365
 366         /**
 367          * Returns information about an index
 368          * If errors are explicitly ignored, returns NULL on failure
 369          * @param string $table
 370          * @param string $index
 371          * @param string $fname
 372          * @return bool
 373          */
 374         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 375                 return false;
 376         }
 377
 378         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 379                 return false;
 380         }
 381
 382         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 383                 if ( !count( $a ) ) {
 384                         return true;
 385                 }
 386
 387                 if ( !is_array( $options ) ) {
 388                         $options = [ $options ];
 389                 }
 390
 391                 if ( in_array( 'IGNORE', $options ) ) {
 392                         $this->ignoreDupValOnIndex = true;
 393                 }
 394
 395                 if ( !is_array( reset( $a ) ) ) {
 396                         $a = [ $a ];
 397                 }
 398
 399                 foreach ( $a as &$row ) {
 400                         $this->insertOneRow( $table, $row, $fname );
 401                 }
 402                 $retVal = true;
 403
 404                 if ( in_array( 'IGNORE', $options ) ) {
 405                         $this->ignoreDupValOnIndex = false;
 406                 }
 407
 408                 return $retVal;
 409         }
 410
 411         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 412                 $col_info = $this->fieldInfoMulti( $table, $col );
 413                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 414
 415                 $bind = '';
 416                 if ( is_numeric( $col ) ) {
 417                         $bind = $val;
 418                         $val = null;
 419
 420                         return $bind;
 421                 } elseif ( $includeCol ) {
 422                         $bind = "$col = ";
 423                 }
 424
 425                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 426                         $val = null;
 427                 }
 428
 429                 if ( $val === 'NULL' ) {
 430                         $val = null;
 431                 }
 432
 433                 if ( $val === null ) {
 434                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 435                                 $bind .= 'DEFAULT';
 436                         } else {
 437                                 $bind .= 'NULL';
 438                         }
 439                 } else {
 440                         $bind .= ':' . $col;
 441                 }
 442
 443                 return $bind;
 444         }
 445
 446         /**
 447          * @param string $table
 448          * @param array $row
 449          * @param string $fname
 450          * @return bool
 451          * @throws DBUnexpectedError
 452          */
 453         private function insertOneRow( $table, $row, $fname ) {
 454                 global $wgContLang;
 455
 456                 $table = $this->tableName( $table );
 457                 // "INSERT INTO tables (a, b, c)"
 458                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 459                 $sql .= " VALUES (";
 460
 461                 // for each value, append ":key"
 462                 $first = true;
 463                 foreach ( $row as $col => &$val ) {
 464                         if ( !$first ) {
 465                                 $sql .= ', ';
 466                         } else {
 467                                 $first = false;
 468                         }
 469                         if ( $this->isQuotedIdentifier( $val ) ) {
 470                                 $sql .= $this->removeIdentifierQuotes( $val );
 471                                 unset( $row[$col] );
 472                         } else {
 473                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 474                         }
 475                 }
 476                 $sql .= ')';
 477
 478                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 479                 if ( $stmt === false ) {
 480                         $e = oci_error( $this->mConn );
 481                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 482
 483                         return false;
 484                 }
 485                 foreach ( $row as $col => &$val ) {
 486                         $col_info = $this->fieldInfoMulti( $table, $col );
 487                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 488
 489                         if ( $val === null ) {
 490                                 // do nothing ... null was inserted in statement creation
 491                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 492                                 if ( is_object( $val ) ) {
 493                                         $val = $val->fetch();
 494                                 }
 495
 496                                 // backward compatibility
 497                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 498                                         $val = $this->getInfinity();
 499                                 }
 500
 501                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 502                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 503                                         $e = oci_error( $stmt );
 504                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 505
 506                                         return false;
 507                                 }
 508                         } else {
 509                                 /** @var OCI_Lob[] $lob */
 510                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
 511                                 if ( $lob[$col] === false ) {
 512                                         $e = oci_error( $stmt );
 513                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 514                                 }
 515
 516                                 if ( is_object( $val ) ) {
 517                                         $val = $val->fetch();
 518                                 }
 519
 520                                 if ( $col_type == 'BLOB' ) {
 521                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 522                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 523                                 } else {
 524                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 525                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 526                                 }
 527                         }
 528                 }
 529
 530                 MediaWiki\suppressWarnings();
 531
 532                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 533                         $e = oci_error( $stmt );
 534                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 535                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 536
 537                                 return false;
 538                         } else {
 539                                 $this->mAffectedRows = oci_num_rows( $stmt );
 540                         }
 541                 } else {
 542                         $this->mAffectedRows = oci_num_rows( $stmt );
 543                 }
 544
 545                 MediaWiki\restoreWarnings();
 546
 547                 if ( isset( $lob ) ) {
 548                         foreach ( $lob as $lob_v ) {
 549                                 $lob_v->free();
 550                         }
 551                 }
 552
 553                 if ( !$this->mTrxLevel ) {
 554                         oci_commit( $this->mConn );
 555                 }
 556
 557                 return oci_free_statement( $stmt );
 558         }
 559
 560         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 561                 $insertOptions = [], $selectOptions = []
 562         ) {
 563                 $destTable = $this->tableName( $destTable );
 564                 if ( !is_array( $selectOptions ) ) {
 565                         $selectOptions = [ $selectOptions ];
 566                 }
 567                 list( $startOpts, $useIndex, $tailOpts, $ignoreIndex ) =
 568                         $this->makeSelectOptions( $selectOptions );
 569                 if ( is_array( $srcTable ) ) {
 570                         $srcTable = implode( ',', array_map( [ $this, 'tableName' ], $srcTable ) );
 571                 } else {
 572                         $srcTable = $this->tableName( $srcTable );
 573                 }
 574
 575                 $sequenceData = $this->getSequenceData( $destTable );
 576                 if ( $sequenceData !== false &&
 577                         !isset( $varMap[$sequenceData['column']] )
 578                 ) {
 579                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 580                 }
 581
 582                 // count-alias subselect fields to avoid abigious definition errors
 583                 $i = 0;
 584                 foreach ( $varMap as &$val ) {
 585                         $val = $val . ' field' . ( $i++ );
 586                 }
 587
 588                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 589                         " SELECT $startOpts " . implode( ',', $varMap ) .
 590                         " FROM $srcTable $useIndex $ignoreIndex ";
 591                 if ( $conds != '*' ) {
 592                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 593                 }
 594                 $sql .= " $tailOpts";
 595
 596                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 597                         $this->ignoreDupValOnIndex = true;
 598                 }
 599
 600                 $retval = $this->query( $sql, $fname );
 601
 602                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 603                         $this->ignoreDupValOnIndex = false;
 604                 }
 605
 606                 return $retval;
 607         }
 608
 609         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 610                 $fname = __METHOD__
 611         ) {
 612                 if ( !count( $rows ) ) {
 613                         return true; // nothing to do
 614                 }
 615
 616                 if ( !is_array( reset( $rows ) ) ) {
 617                         $rows = [ $rows ];
 618                 }
 619
 620                 $sequenceData = $this->getSequenceData( $table );
 621                 if ( $sequenceData !== false ) {
 622                         // add sequence column to each list of columns, when not set
 623                         foreach ( $rows as &$row ) {
 624                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 625                                         $row[$sequenceData['column']] =
 626                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 627                                                         $sequenceData['sequence'] . '\')' );
 628                                 }
 629                         }
 630                 }
 631
 632                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 633         }
 634
 635         function tableName( $name, $format = 'quoted' ) {
 636                 /*
 637                 Replace reserved words with better ones
 638                 Using uppercase because that's the only way Oracle can handle
 639                 quoted tablenames
 640                 */
 641                 switch ( $name ) {
 642                         case 'user':
 643                                 $name = 'MWUSER';
 644                                 break;
 645                         case 'text':
 646                                 $name = 'PAGECONTENT';
 647                                 break;
 648                 }
 649
 650                 return strtoupper( parent::tableName( $name, $format ) );
 651         }
 652
 653         function tableNameInternal( $name ) {
 654                 $name = $this->tableName( $name );
 655
 656                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 657         }
 658
 659         /**
 660          * Return the next in a sequence, save the value for retrieval via insertId()
 661          *
 662          * @param string $seqName
 663          * @return null|int
 664          */
 665         function nextSequenceValue( $seqName ) {
 666                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 667                 $row = $this->fetchRow( $res );
 668                 $this->mInsertId = $row[0];
 669
 670                 return $this->mInsertId;
 671         }
 672
 673         /**
 674          * Return sequence_name if table has a sequence
 675          *
 676          * @param string $table
 677          * @return bool
 678          */
 679         private function getSequenceData( $table ) {
 680                 if ( $this->sequenceData == null ) {
 681                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 682                                 lower(atc.table_name),
 683                                 lower(atc.column_name)
 684                         FROM all_sequences asq, all_tab_columns atc
 685                         WHERE decode(
 686                                         atc.table_name,
 687                                         '{$this->mTablePrefix}MWUSER',
 688                                         '{$this->mTablePrefix}USER',
 689                                         atc.table_name
 690                                 ) || '_' ||
 691                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 692                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 693                                 AND atc.owner = upper('{$this->mDBname}')" );
 694
 695                         while ( ( $row = $result->fetchRow() ) !== false ) {
 696                                 $this->sequenceData[$row[1]] = [
 697                                         'sequence' => $row[0],
 698                                         'column' => $row[2]
 699                                 ];
 700                         }
 701                 }
 702                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 703
 704                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 705         }
 706
 707         /**
 708          * Returns the size of a text field, or -1 for "unlimited"
 709          *
 710          * @param string $table
 711          * @param string $field
 712          * @return mixed
 713          */
 714         function textFieldSize( $table, $field ) {
 715                 $fieldInfoData = $this->fieldInfo( $table, $field );
 716
 717                 return $fieldInfoData->maxLength();
 718         }
 719
 720         function limitResult( $sql, $limit, $offset = false ) {
 721                 if ( $offset === false ) {
 722                         $offset = 0;
 723                 }
 724
 725                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 726         }
 727
 728         function encodeBlob( $b ) {
 729                 return new Blob( $b );
 730         }
 731
 732         function decodeBlob( $b ) {
 733                 if ( $b instanceof Blob ) {
 734                         $b = $b->fetch();
 735                 }
 736
 737                 return $b;
 738         }
 739
 740         function unionQueries( $sqls, $all ) {
 741                 $glue = ' UNION ALL ';
 742
 743                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 744                         'FROM (' . implode( $glue, $sqls ) . ')';
 745         }
 746
 747         function wasDeadlock() {
 748                 return $this->lastErrno() == 'OCI-00060';
 749         }
 750
 751         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 752                 $fname = __METHOD__
 753         ) {
 754                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 755
 756                 $newName = strtoupper( $newName );
 757                 $oldName = strtoupper( $oldName );
 758
 759                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 760                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 761                 $newPrefix = strtoupper( $this->mTablePrefix );
 762
 763                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 764                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 765         }
 766
 767         function listTables( $prefix = null, $fname = __METHOD__ ) {
 768                 $listWhere = '';
 769                 if ( !empty( $prefix ) ) {
 770                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 771                 }
 772
 773                 $owner = strtoupper( $this->mDBname );
 774                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 775                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 776
 777                 // dirty code ... i know
 778                 $endArray = [];
 779                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 780                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 781                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 782                 $fixedOrderTabs = $endArray;
 783                 while ( ( $row = $result->fetchRow() ) !== false ) {
 784                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 785                                 $endArray[] = $row['table_name'];
 786                         }
 787                 }
 788
 789                 return $endArray;
 790         }
 791
 792         public function dropTable( $tableName, $fName = __METHOD__ ) {
 793                 $tableName = $this->tableName( $tableName );
 794                 if ( !$this->tableExists( $tableName ) ) {
 795                         return false;
 796                 }
 797
 798                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 799         }
 800
 801         function timestamp( $ts = 0 ) {
 802                 return wfTimestamp( TS_ORACLE, $ts );
 803         }
 804
 805         /**
 806          * Return aggregated value function call
 807          *
 808          * @param array $valuedata
 809          * @param string $valuename
 810          * @return mixed
 811          */
 812         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 813                 return $valuedata;
 814         }
 815
 816         /**
 817          * @return string Wikitext of a link to the server software's web site
 818          */
 819         public function getSoftwareLink() {
 820                 return '[{{int:version-db-oracle-url}} Oracle]';
 821         }
 822
 823         /**
 824          * @return string Version information from the database
 825          */
 826         function getServerVersion() {
 827                 // better version number, fallback on driver
 828                 $rset = $this->doQuery(
 829                         'SELECT version FROM product_component_version ' .
 830                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 831                 );
 832                 $row = $rset->fetchRow();
 833                 if ( !$row ) {
 834                         return oci_server_version( $this->mConn );
 835                 }
 836
 837                 return $row['version'];
 838         }
 839
 840         /**
 841          * Query whether a given index exists
 842          * @param string $table
 843          * @param string $index
 844          * @param string $fname
 845          * @return bool
 846          */
 847         function indexExists( $table, $index, $fname = __METHOD__ ) {
 848                 $table = $this->tableName( $table );
 849                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 850                 $index = strtoupper( $index );
 851                 $owner = strtoupper( $this->mDBname );
 852                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 853                 $res = $this->doQuery( $sql );
 854                 if ( $res ) {
 855                         $count = $res->numRows();
 856                         $res->free();
 857                 } else {
 858                         $count = 0;
 859                 }
 860
 861                 return $count != 0;
 862         }
 863
 864         /**
 865          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 866          * @param string $table
 867          * @param string $fname
 868          * @return bool
 869          */
 870         function tableExists( $table, $fname = __METHOD__ ) {
 871                 $table = $this->tableName( $table );
 872                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 873                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 874                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 875                 $res = $this->doQuery( $sql );
 876                 if ( $res && $res->numRows() > 0 ) {
 877                         $exists = true;
 878                 } else {
 879                         $exists = false;
 880                 }
 881
 882                 $res->free();
 883
 884                 return $exists;
 885         }
 886
 887         /**
 888          * Function translates mysql_fetch_field() functionality on ORACLE.
 889          * Caching is present for reducing query time.
 890          * For internal calls. Use fieldInfo for normal usage.
 891          * Returns false if the field doesn't exist
 892          *
 893          * @param array|string $table
 894          * @param string $field
 895          * @return ORAField|ORAResult|false
 896          */
 897         private function fieldInfoMulti( $table, $field ) {
 898                 $field = strtoupper( $field );
 899                 if ( is_array( $table ) ) {
 900                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 901                         $tableWhere = 'IN (';
 902                         foreach ( $table as &$singleTable ) {
 903                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 904                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 905                                         return $this->mFieldInfoCache["$singleTable.$field"];
 906                                 }
 907                                 $tableWhere .= '\'' . $singleTable . '\',';
 908                         }
 909                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 910                 } else {
 911                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 912                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 913                                 return $this->mFieldInfoCache["$table.$field"];
 914                         }
 915                         $tableWhere = '= \'' . $table . '\'';
 916                 }
 917
 918                 $fieldInfoStmt = oci_parse(
 919                         $this->mConn,
 920                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 921                                 $tableWhere . ' and column_name = \'' . $field . '\''
 922                 );
 923                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 924                         $e = oci_error( $fieldInfoStmt );
 925                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 926
 927                         return false;
 928                 }
 929                 $res = new ORAResult( $this, $fieldInfoStmt );
 930                 if ( $res->numRows() == 0 ) {
 931                         if ( is_array( $table ) ) {
 932                                 foreach ( $table as &$singleTable ) {
 933                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 934                                 }
 935                         } else {
 936                                 $this->mFieldInfoCache["$table.$field"] = false;
 937                         }
 938                         $fieldInfoTemp = null;
 939                 } else {
 940                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 941                         $table = $fieldInfoTemp->tableName();
 942                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 943                 }
 944                 $res->free();
 945
 946                 return $fieldInfoTemp;
 947         }
 948
 949         /**
 950          * @throws DBUnexpectedError
 951          * @param string $table
 952          * @param string $field
 953          * @return ORAField
 954          */
 955         function fieldInfo( $table, $field ) {
 956                 if ( is_array( $table ) ) {
 957                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 958                 }
 959
 960                 return $this->fieldInfoMulti( $table, $field );
 961         }
 962
 963         protected function doBegin( $fname = __METHOD__ ) {
 964                 $this->mTrxLevel = 1;
 965                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 966         }
 967
 968         protected function doCommit( $fname = __METHOD__ ) {
 969                 if ( $this->mTrxLevel ) {
 970                         $ret = oci_commit( $this->mConn );
 971                         if ( !$ret ) {
 972                                 throw new DBUnexpectedError( $this, $this->lastError() );
 973                         }
 974                         $this->mTrxLevel = 0;
 975                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 976                 }
 977         }
 978
 979         protected function doRollback( $fname = __METHOD__ ) {
 980                 if ( $this->mTrxLevel ) {
 981                         oci_rollback( $this->mConn );
 982                         $this->mTrxLevel = 0;
 983                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 984                 }
 985         }
 986
 987         function sourceStream(
 988                 $fp,
 989                 callable $lineCallback = null,
 990                 callable $resultCallback = null,
 991                 $fname = __METHOD__, callable $inputCallback = null
 992         ) {
 993                 $cmd = '';
 994                 $done = false;
 995                 $dollarquote = false;
 996
 997                 $replacements = [];
 998                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 999                 while ( !feof( $fp ) ) {
1000                         if ( $lineCallback ) {
1001                                 call_user_func( $lineCallback );
1002                         }
1003                         $line = trim( fgets( $fp, 1024 ) );
1004                         $sl = strlen( $line ) - 1;
1005
1006                         if ( $sl < 0 ) {
1007                                 continue;
1008                         }
1009                         if ( '-' == $line[0] && '-' == $line[1] ) {
1010                                 continue;
1011                         }
1012
1013                         // Allow dollar quoting for function declarations
1014                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1015                                 if ( $dollarquote ) {
1016                                         $dollarquote = false;
1017                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1018                                         $done = true;
1019                                 } else {
1020                                         $dollarquote = true;
1021                                 }
1022                         } elseif ( !$dollarquote ) {
1023                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1024                                         $done = true;
1025                                         $line = substr( $line, 0, $sl );
1026                                 }
1027                         }
1028
1029                         if ( $cmd != '' ) {
1030                                 $cmd .= ' ';
1031                         }
1032                         $cmd .= "$line\n";
1033
1034                         if ( $done ) {
1035                                 $cmd = str_replace( ';;', ";", $cmd );
1036                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1037                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1038                                                 $replacements[$defines[2]] = $defines[1];
1039                                         }
1040                                 } else {
1041                                         foreach ( $replacements as $mwVar => $scVar ) {
1042                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1043                                         }
1044
1045                                         $cmd = $this->replaceVars( $cmd );
1046                                         if ( $inputCallback ) {
1047                                                 call_user_func( $inputCallback, $cmd );
1048                                         }
1049                                         $res = $this->doQuery( $cmd );
1050                                         if ( $resultCallback ) {
1051                                                 call_user_func( $resultCallback, $res, $this );
1052                                         }
1053
1054                                         if ( false === $res ) {
1055                                                 $err = $this->lastError();
1056
1057                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1058                                         }
1059                                 }
1060
1061                                 $cmd = '';
1062                                 $done = false;
1063                         }
1064                 }
1065
1066                 return true;
1067         }
1068
1069         function selectDB( $db ) {
1070                 $this->mDBname = $db;
1071                 if ( $db == null || $db == $this->mUser ) {
1072                         return true;
1073                 }
1074                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1075                 $stmt = oci_parse( $this->mConn, $sql );
1076                 MediaWiki\suppressWarnings();
1077                 $success = oci_execute( $stmt );
1078                 MediaWiki\restoreWarnings();
1079                 if ( !$success ) {
1080                         $e = oci_error( $stmt );
1081                         if ( $e['code'] != '1435' ) {
1082                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1083                         }
1084
1085                         return false;
1086                 }
1087
1088                 return true;
1089         }
1090
1091         function strencode( $s ) {
1092                 return str_replace( "'", "''", $s );
1093         }
1094
1095         function addQuotes( $s ) {
1096                 global $wgContLang;
1097                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1098                         $s = $wgContLang->checkTitleEncoding( $s );
1099                 }
1100
1101                 return "'" . $this->strencode( $s ) . "'";
1102         }
1103
1104         public function addIdentifierQuotes( $s ) {
1105                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1106                         $s = '/*Q*/' . $s;
1107                 }
1108
1109                 return $s;
1110         }
1111
1112         public function removeIdentifierQuotes( $s ) {
1113                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1114         }
1115
1116         public function isQuotedIdentifier( $s ) {
1117                 return strpos( $s, '/*Q*/' ) !== false;
1118         }
1119
1120         private function wrapFieldForWhere( $table, &$col, &$val ) {
1121                 global $wgContLang;
1122
1123                 $col_info = $this->fieldInfoMulti( $table, $col );
1124                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1125                 if ( $col_type == 'CLOB' ) {
1126                         $col = 'TO_CHAR(' . $col . ')';
1127                         $val = $wgContLang->checkTitleEncoding( $val );
1128                 } elseif ( $col_type == 'VARCHAR2' ) {
1129                         $val = $wgContLang->checkTitleEncoding( $val );
1130                 }
1131         }
1132
1133         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1134                 $conds2 = [];
1135                 foreach ( $conds as $col => $val ) {
1136                         if ( is_array( $val ) ) {
1137                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1138                         } else {
1139                                 if ( is_numeric( $col ) && $parentCol != null ) {
1140                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1141                                 } else {
1142                                         $this->wrapFieldForWhere( $table, $col, $val );
1143                                 }
1144                                 $conds2[$col] = $val;
1145                         }
1146                 }
1147
1148                 return $conds2;
1149         }
1150
1151         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1152                 $options = [], $join_conds = []
1153         ) {
1154                 if ( is_array( $conds ) ) {
1155                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1156                 }
1157
1158                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1159         }
1160
1161         /**
1162          * Returns an optional USE INDEX clause to go after the table, and a
1163          * string to go at the end of the query
1164          *
1165          * @param array $options An associative array of options to be turned into
1166          *   an SQL query, valid keys are listed in the function.
1167          * @return array
1168          */
1169         function makeSelectOptions( $options ) {
1170                 $preLimitTail = $postLimitTail = '';
1171                 $startOpts = '';
1172
1173                 $noKeyOptions = [];
1174                 foreach ( $options as $key => $option ) {
1175                         if ( is_numeric( $key ) ) {
1176                                 $noKeyOptions[$option] = true;
1177                         }
1178                 }
1179
1180                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1181
1182                 $preLimitTail .= $this->makeOrderBy( $options );
1183
1184                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1185                         $postLimitTail .= ' FOR UPDATE';
1186                 }
1187
1188                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1189                         $startOpts .= 'DISTINCT';
1190                 }
1191
1192                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1193                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1194                 } else {
1195                         $useIndex = '';
1196                 }
1197
1198                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1199                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1200                 } else {
1201                         $ignoreIndex = '';
1202                 }
1203
1204                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1205         }
1206
1207         public function delete( $table, $conds, $fname = __METHOD__ ) {
1208                 if ( is_array( $conds ) ) {
1209                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1210                 }
1211                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1212                 // all deletions on these tables have transactions so final failure rollbacks these updates
1213                 $table = $this->tableName( $table );
1214                 if ( $table == $this->tableName( 'user' ) ) {
1215                         $this->update( 'archive', [ 'ar_user' => 0 ],
1216                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1217                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1218                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1219                         $this->update( 'image', [ 'img_user' => 0 ],
1220                                 [ 'img_user' => $conds['user_id'] ], $fname );
1221                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1222                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1223                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1224                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1225                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1226                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1227                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1228                                 [ 'us_user' => $conds['user_id'] ], $fname );
1229                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1230                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1231                         $this->update( 'logging', [ 'log_user' => 0 ],
1232                                 [ 'log_user' => $conds['user_id'] ], $fname );
1233                 } elseif ( $table == $this->tableName( 'image' ) ) {
1234                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1235                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1236                 }
1237
1238                 return parent::delete( $table, $conds, $fname );
1239         }
1240
1241         /**
1242          * @param string $table
1243          * @param array $values
1244          * @param array $conds
1245          * @param string $fname
1246          * @param array $options
1247          * @return bool
1248          * @throws DBUnexpectedError
1249          */
1250         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1251                 global $wgContLang;
1252
1253                 $table = $this->tableName( $table );
1254                 $opts = $this->makeUpdateOptions( $options );
1255                 $sql = "UPDATE $opts $table SET ";
1256
1257                 $first = true;
1258                 foreach ( $values as $col => &$val ) {
1259                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1260
1261                         if ( !$first ) {
1262                                 $sqlSet = ', ' . $sqlSet;
1263                         } else {
1264                                 $first = false;
1265                         }
1266                         $sql .= $sqlSet;
1267                 }
1268
1269                 if ( $conds !== [] && $conds !== '*' ) {
1270                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1271                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1272                 }
1273
1274                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1275                 if ( $stmt === false ) {
1276                         $e = oci_error( $this->mConn );
1277                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1278
1279                         return false;
1280                 }
1281                 foreach ( $values as $col => &$val ) {
1282                         $col_info = $this->fieldInfoMulti( $table, $col );
1283                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1284
1285                         if ( $val === null ) {
1286                                 // do nothing ... null was inserted in statement creation
1287                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1288                                 if ( is_object( $val ) ) {
1289                                         $val = $val->getData();
1290                                 }
1291
1292                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1293                                         $val = '31-12-2030 12:00:00.000000';
1294                                 }
1295
1296                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1297                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1298                                         $e = oci_error( $stmt );
1299                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1300
1301                                         return false;
1302                                 }
1303                         } else {
1304                                 /** @var OCI_Lob[] $lob */
1305                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1306                                 if ( $lob[$col] === false ) {
1307                                         $e = oci_error( $stmt );
1308                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1309                                 }
1310
1311                                 if ( is_object( $val ) ) {
1312                                         $val = $val->getData();
1313                                 }
1314
1315                                 if ( $col_type == 'BLOB' ) {
1316                                         $lob[$col]->writeTemporary( $val );
1317                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1318                                 } else {
1319                                         $lob[$col]->writeTemporary( $val );
1320                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1321                                 }
1322                         }
1323                 }
1324
1325                 MediaWiki\suppressWarnings();
1326
1327                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1328                         $e = oci_error( $stmt );
1329                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1330                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1331
1332                                 return false;
1333                         } else {
1334                                 $this->mAffectedRows = oci_num_rows( $stmt );
1335                         }
1336                 } else {
1337                         $this->mAffectedRows = oci_num_rows( $stmt );
1338                 }
1339
1340                 MediaWiki\restoreWarnings();
1341
1342                 if ( isset( $lob ) ) {
1343                         foreach ( $lob as $lob_v ) {
1344                                 $lob_v->free();
1345                         }
1346                 }
1347
1348                 if ( !$this->mTrxLevel ) {
1349                         oci_commit( $this->mConn );
1350                 }
1351
1352                 return oci_free_statement( $stmt );
1353         }
1354
1355         function bitNot( $field ) {
1356                 // expecting bit-fields smaller than 4bytes
1357                 return 'BITNOT(' . $field . ')';
1358         }
1359
1360         function bitAnd( $fieldLeft, $fieldRight ) {
1361                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1362         }
1363
1364         function bitOr( $fieldLeft, $fieldRight ) {
1365                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1366         }
1367
1368         function getDBname() {
1369                 return $this->mDBname;
1370         }
1371
1372         function getServer() {
1373                 return $this->mServer;
1374         }
1375
1376         public function buildGroupConcatField(
1377                 $delim, $table, $field, $conds = '', $join_conds = []
1378         ) {
1379                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1380
1381                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1382         }
1383
1384         /**
1385          * @param string $field Field or column to cast
1386          * @return string
1387          * @since 1.28
1388          */
1389         public function buildStringCast( $field ) {
1390                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1391         }
1392
1393         public function getInfinity() {
1394                 return '31-12-2030 12:00:00.000000';
1395         }
1396 }