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 = [], $selectJoinConds = []
 562         ) {
 563                 $destTable = $this->tableName( $destTable );
 564
 565                 $sequenceData = $this->getSequenceData( $destTable );
 566                 if ( $sequenceData !== false &&
 567                         !isset( $varMap[$sequenceData['column']] )
 568                 ) {
 569                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 570                 }
 571
 572                 // count-alias subselect fields to avoid abigious definition errors
 573                 $i = 0;
 574                 foreach ( $varMap as &$val ) {
 575                         $val = $val . ' field' . ( $i++ );
 576                 }
 577
 578                 $selectSql = $this->selectSQLText(
 579                         $srcTable,
 580                         array_values( $varMap ),
 581                         $conds,
 582                         $fname,
 583                         $selectOptions,
 584                         $selectJoinConds
 585                 );
 586
 587                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 588
 589                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 590                         $this->ignoreDupValOnIndex = true;
 591                 }
 592
 593                 $retval = $this->query( $sql, $fname );
 594
 595                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 596                         $this->ignoreDupValOnIndex = false;
 597                 }
 598
 599                 return $retval;
 600         }
 601
 602         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 603                 $fname = __METHOD__
 604         ) {
 605                 if ( !count( $rows ) ) {
 606                         return true; // nothing to do
 607                 }
 608
 609                 if ( !is_array( reset( $rows ) ) ) {
 610                         $rows = [ $rows ];
 611                 }
 612
 613                 $sequenceData = $this->getSequenceData( $table );
 614                 if ( $sequenceData !== false ) {
 615                         // add sequence column to each list of columns, when not set
 616                         foreach ( $rows as &$row ) {
 617                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 618                                         $row[$sequenceData['column']] =
 619                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 620                                                         $sequenceData['sequence'] . '\')' );
 621                                 }
 622                         }
 623                 }
 624
 625                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 626         }
 627
 628         function tableName( $name, $format = 'quoted' ) {
 629                 /*
 630                 Replace reserved words with better ones
 631                 Using uppercase because that's the only way Oracle can handle
 632                 quoted tablenames
 633                 */
 634                 switch ( $name ) {
 635                         case 'user':
 636                                 $name = 'MWUSER';
 637                                 break;
 638                         case 'text':
 639                                 $name = 'PAGECONTENT';
 640                                 break;
 641                 }
 642
 643                 return strtoupper( parent::tableName( $name, $format ) );
 644         }
 645
 646         function tableNameInternal( $name ) {
 647                 $name = $this->tableName( $name );
 648
 649                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 650         }
 651
 652         /**
 653          * Return the next in a sequence, save the value for retrieval via insertId()
 654          *
 655          * @param string $seqName
 656          * @return null|int
 657          */
 658         function nextSequenceValue( $seqName ) {
 659                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 660                 $row = $this->fetchRow( $res );
 661                 $this->mInsertId = $row[0];
 662
 663                 return $this->mInsertId;
 664         }
 665
 666         /**
 667          * Return sequence_name if table has a sequence
 668          *
 669          * @param string $table
 670          * @return bool
 671          */
 672         private function getSequenceData( $table ) {
 673                 if ( $this->sequenceData == null ) {
 674                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 675                                 lower(atc.table_name),
 676                                 lower(atc.column_name)
 677                         FROM all_sequences asq, all_tab_columns atc
 678                         WHERE decode(
 679                                         atc.table_name,
 680                                         '{$this->mTablePrefix}MWUSER',
 681                                         '{$this->mTablePrefix}USER',
 682                                         atc.table_name
 683                                 ) || '_' ||
 684                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 685                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 686                                 AND atc.owner = upper('{$this->mDBname}')" );
 687
 688                         while ( ( $row = $result->fetchRow() ) !== false ) {
 689                                 $this->sequenceData[$row[1]] = [
 690                                         'sequence' => $row[0],
 691                                         'column' => $row[2]
 692                                 ];
 693                         }
 694                 }
 695                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 696
 697                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 698         }
 699
 700         /**
 701          * Returns the size of a text field, or -1 for "unlimited"
 702          *
 703          * @param string $table
 704          * @param string $field
 705          * @return mixed
 706          */
 707         function textFieldSize( $table, $field ) {
 708                 $fieldInfoData = $this->fieldInfo( $table, $field );
 709
 710                 return $fieldInfoData->maxLength();
 711         }
 712
 713         function limitResult( $sql, $limit, $offset = false ) {
 714                 if ( $offset === false ) {
 715                         $offset = 0;
 716                 }
 717
 718                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 719         }
 720
 721         function encodeBlob( $b ) {
 722                 return new Blob( $b );
 723         }
 724
 725         function decodeBlob( $b ) {
 726                 if ( $b instanceof Blob ) {
 727                         $b = $b->fetch();
 728                 }
 729
 730                 return $b;
 731         }
 732
 733         function unionQueries( $sqls, $all ) {
 734                 $glue = ' UNION ALL ';
 735
 736                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 737                         'FROM (' . implode( $glue, $sqls ) . ')';
 738         }
 739
 740         function wasDeadlock() {
 741                 return $this->lastErrno() == 'OCI-00060';
 742         }
 743
 744         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 745                 $fname = __METHOD__
 746         ) {
 747                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 748
 749                 $newName = strtoupper( $newName );
 750                 $oldName = strtoupper( $oldName );
 751
 752                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 753                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 754                 $newPrefix = strtoupper( $this->mTablePrefix );
 755
 756                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 757                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 758         }
 759
 760         function listTables( $prefix = null, $fname = __METHOD__ ) {
 761                 $listWhere = '';
 762                 if ( !empty( $prefix ) ) {
 763                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 764                 }
 765
 766                 $owner = strtoupper( $this->mDBname );
 767                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 768                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 769
 770                 // dirty code ... i know
 771                 $endArray = [];
 772                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 773                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 774                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 775                 $fixedOrderTabs = $endArray;
 776                 while ( ( $row = $result->fetchRow() ) !== false ) {
 777                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 778                                 $endArray[] = $row['table_name'];
 779                         }
 780                 }
 781
 782                 return $endArray;
 783         }
 784
 785         public function dropTable( $tableName, $fName = __METHOD__ ) {
 786                 $tableName = $this->tableName( $tableName );
 787                 if ( !$this->tableExists( $tableName ) ) {
 788                         return false;
 789                 }
 790
 791                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 792         }
 793
 794         function timestamp( $ts = 0 ) {
 795                 return wfTimestamp( TS_ORACLE, $ts );
 796         }
 797
 798         /**
 799          * Return aggregated value function call
 800          *
 801          * @param array $valuedata
 802          * @param string $valuename
 803          * @return mixed
 804          */
 805         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 806                 return $valuedata;
 807         }
 808
 809         /**
 810          * @return string Wikitext of a link to the server software's web site
 811          */
 812         public function getSoftwareLink() {
 813                 return '[{{int:version-db-oracle-url}} Oracle]';
 814         }
 815
 816         /**
 817          * @return string Version information from the database
 818          */
 819         function getServerVersion() {
 820                 // better version number, fallback on driver
 821                 $rset = $this->doQuery(
 822                         'SELECT version FROM product_component_version ' .
 823                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 824                 );
 825                 $row = $rset->fetchRow();
 826                 if ( !$row ) {
 827                         return oci_server_version( $this->mConn );
 828                 }
 829
 830                 return $row['version'];
 831         }
 832
 833         /**
 834          * Query whether a given index exists
 835          * @param string $table
 836          * @param string $index
 837          * @param string $fname
 838          * @return bool
 839          */
 840         function indexExists( $table, $index, $fname = __METHOD__ ) {
 841                 $table = $this->tableName( $table );
 842                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 843                 $index = strtoupper( $index );
 844                 $owner = strtoupper( $this->mDBname );
 845                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 846                 $res = $this->doQuery( $sql );
 847                 if ( $res ) {
 848                         $count = $res->numRows();
 849                         $res->free();
 850                 } else {
 851                         $count = 0;
 852                 }
 853
 854                 return $count != 0;
 855         }
 856
 857         /**
 858          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 859          * @param string $table
 860          * @param string $fname
 861          * @return bool
 862          */
 863         function tableExists( $table, $fname = __METHOD__ ) {
 864                 $table = $this->tableName( $table );
 865                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 866                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 867                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 868                 $res = $this->doQuery( $sql );
 869                 if ( $res && $res->numRows() > 0 ) {
 870                         $exists = true;
 871                 } else {
 872                         $exists = false;
 873                 }
 874
 875                 $res->free();
 876
 877                 return $exists;
 878         }
 879
 880         /**
 881          * Function translates mysql_fetch_field() functionality on ORACLE.
 882          * Caching is present for reducing query time.
 883          * For internal calls. Use fieldInfo for normal usage.
 884          * Returns false if the field doesn't exist
 885          *
 886          * @param array|string $table
 887          * @param string $field
 888          * @return ORAField|ORAResult|false
 889          */
 890         private function fieldInfoMulti( $table, $field ) {
 891                 $field = strtoupper( $field );
 892                 if ( is_array( $table ) ) {
 893                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 894                         $tableWhere = 'IN (';
 895                         foreach ( $table as &$singleTable ) {
 896                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 897                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 898                                         return $this->mFieldInfoCache["$singleTable.$field"];
 899                                 }
 900                                 $tableWhere .= '\'' . $singleTable . '\',';
 901                         }
 902                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 903                 } else {
 904                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 905                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 906                                 return $this->mFieldInfoCache["$table.$field"];
 907                         }
 908                         $tableWhere = '= \'' . $table . '\'';
 909                 }
 910
 911                 $fieldInfoStmt = oci_parse(
 912                         $this->mConn,
 913                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 914                                 $tableWhere . ' and column_name = \'' . $field . '\''
 915                 );
 916                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 917                         $e = oci_error( $fieldInfoStmt );
 918                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 919
 920                         return false;
 921                 }
 922                 $res = new ORAResult( $this, $fieldInfoStmt );
 923                 if ( $res->numRows() == 0 ) {
 924                         if ( is_array( $table ) ) {
 925                                 foreach ( $table as &$singleTable ) {
 926                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 927                                 }
 928                         } else {
 929                                 $this->mFieldInfoCache["$table.$field"] = false;
 930                         }
 931                         $fieldInfoTemp = null;
 932                 } else {
 933                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 934                         $table = $fieldInfoTemp->tableName();
 935                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 936                 }
 937                 $res->free();
 938
 939                 return $fieldInfoTemp;
 940         }
 941
 942         /**
 943          * @throws DBUnexpectedError
 944          * @param string $table
 945          * @param string $field
 946          * @return ORAField
 947          */
 948         function fieldInfo( $table, $field ) {
 949                 if ( is_array( $table ) ) {
 950                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 951                 }
 952
 953                 return $this->fieldInfoMulti( $table, $field );
 954         }
 955
 956         protected function doBegin( $fname = __METHOD__ ) {
 957                 $this->mTrxLevel = 1;
 958                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 959         }
 960
 961         protected function doCommit( $fname = __METHOD__ ) {
 962                 if ( $this->mTrxLevel ) {
 963                         $ret = oci_commit( $this->mConn );
 964                         if ( !$ret ) {
 965                                 throw new DBUnexpectedError( $this, $this->lastError() );
 966                         }
 967                         $this->mTrxLevel = 0;
 968                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 969                 }
 970         }
 971
 972         protected function doRollback( $fname = __METHOD__ ) {
 973                 if ( $this->mTrxLevel ) {
 974                         oci_rollback( $this->mConn );
 975                         $this->mTrxLevel = 0;
 976                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 977                 }
 978         }
 979
 980         function sourceStream(
 981                 $fp,
 982                 callable $lineCallback = null,
 983                 callable $resultCallback = null,
 984                 $fname = __METHOD__, callable $inputCallback = null
 985         ) {
 986                 $cmd = '';
 987                 $done = false;
 988                 $dollarquote = false;
 989
 990                 $replacements = [];
 991                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 992                 while ( !feof( $fp ) ) {
 993                         if ( $lineCallback ) {
 994                                 call_user_func( $lineCallback );
 995                         }
 996                         $line = trim( fgets( $fp, 1024 ) );
 997                         $sl = strlen( $line ) - 1;
 998
 999                         if ( $sl < 0 ) {
1000                                 continue;
1001                         }
1002                         if ( '-' == $line[0] && '-' == $line[1] ) {
1003                                 continue;
1004                         }
1005
1006                         // Allow dollar quoting for function declarations
1007                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1008                                 if ( $dollarquote ) {
1009                                         $dollarquote = false;
1010                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1011                                         $done = true;
1012                                 } else {
1013                                         $dollarquote = true;
1014                                 }
1015                         } elseif ( !$dollarquote ) {
1016                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1017                                         $done = true;
1018                                         $line = substr( $line, 0, $sl );
1019                                 }
1020                         }
1021
1022                         if ( $cmd != '' ) {
1023                                 $cmd .= ' ';
1024                         }
1025                         $cmd .= "$line\n";
1026
1027                         if ( $done ) {
1028                                 $cmd = str_replace( ';;', ";", $cmd );
1029                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1030                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1031                                                 $replacements[$defines[2]] = $defines[1];
1032                                         }
1033                                 } else {
1034                                         foreach ( $replacements as $mwVar => $scVar ) {
1035                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1036                                         }
1037
1038                                         $cmd = $this->replaceVars( $cmd );
1039                                         if ( $inputCallback ) {
1040                                                 call_user_func( $inputCallback, $cmd );
1041                                         }
1042                                         $res = $this->doQuery( $cmd );
1043                                         if ( $resultCallback ) {
1044                                                 call_user_func( $resultCallback, $res, $this );
1045                                         }
1046
1047                                         if ( false === $res ) {
1048                                                 $err = $this->lastError();
1049
1050                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1051                                         }
1052                                 }
1053
1054                                 $cmd = '';
1055                                 $done = false;
1056                         }
1057                 }
1058
1059                 return true;
1060         }
1061
1062         function selectDB( $db ) {
1063                 $this->mDBname = $db;
1064                 if ( $db == null || $db == $this->mUser ) {
1065                         return true;
1066                 }
1067                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1068                 $stmt = oci_parse( $this->mConn, $sql );
1069                 MediaWiki\suppressWarnings();
1070                 $success = oci_execute( $stmt );
1071                 MediaWiki\restoreWarnings();
1072                 if ( !$success ) {
1073                         $e = oci_error( $stmt );
1074                         if ( $e['code'] != '1435' ) {
1075                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1076                         }
1077
1078                         return false;
1079                 }
1080
1081                 return true;
1082         }
1083
1084         function strencode( $s ) {
1085                 return str_replace( "'", "''", $s );
1086         }
1087
1088         function addQuotes( $s ) {
1089                 global $wgContLang;
1090                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1091                         $s = $wgContLang->checkTitleEncoding( $s );
1092                 }
1093
1094                 return "'" . $this->strencode( $s ) . "'";
1095         }
1096
1097         public function addIdentifierQuotes( $s ) {
1098                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1099                         $s = '/*Q*/' . $s;
1100                 }
1101
1102                 return $s;
1103         }
1104
1105         public function removeIdentifierQuotes( $s ) {
1106                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1107         }
1108
1109         public function isQuotedIdentifier( $s ) {
1110                 return strpos( $s, '/*Q*/' ) !== false;
1111         }
1112
1113         private function wrapFieldForWhere( $table, &$col, &$val ) {
1114                 global $wgContLang;
1115
1116                 $col_info = $this->fieldInfoMulti( $table, $col );
1117                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1118                 if ( $col_type == 'CLOB' ) {
1119                         $col = 'TO_CHAR(' . $col . ')';
1120                         $val = $wgContLang->checkTitleEncoding( $val );
1121                 } elseif ( $col_type == 'VARCHAR2' ) {
1122                         $val = $wgContLang->checkTitleEncoding( $val );
1123                 }
1124         }
1125
1126         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1127                 $conds2 = [];
1128                 foreach ( $conds as $col => $val ) {
1129                         if ( is_array( $val ) ) {
1130                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1131                         } else {
1132                                 if ( is_numeric( $col ) && $parentCol != null ) {
1133                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1134                                 } else {
1135                                         $this->wrapFieldForWhere( $table, $col, $val );
1136                                 }
1137                                 $conds2[$col] = $val;
1138                         }
1139                 }
1140
1141                 return $conds2;
1142         }
1143
1144         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1145                 $options = [], $join_conds = []
1146         ) {
1147                 if ( is_array( $conds ) ) {
1148                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1149                 }
1150
1151                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1152         }
1153
1154         /**
1155          * Returns an optional USE INDEX clause to go after the table, and a
1156          * string to go at the end of the query
1157          *
1158          * @param array $options An associative array of options to be turned into
1159          *   an SQL query, valid keys are listed in the function.
1160          * @return array
1161          */
1162         function makeSelectOptions( $options ) {
1163                 $preLimitTail = $postLimitTail = '';
1164                 $startOpts = '';
1165
1166                 $noKeyOptions = [];
1167                 foreach ( $options as $key => $option ) {
1168                         if ( is_numeric( $key ) ) {
1169                                 $noKeyOptions[$option] = true;
1170                         }
1171                 }
1172
1173                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1174
1175                 $preLimitTail .= $this->makeOrderBy( $options );
1176
1177                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1178                         $postLimitTail .= ' FOR UPDATE';
1179                 }
1180
1181                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1182                         $startOpts .= 'DISTINCT';
1183                 }
1184
1185                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1186                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1187                 } else {
1188                         $useIndex = '';
1189                 }
1190
1191                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1192                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1193                 } else {
1194                         $ignoreIndex = '';
1195                 }
1196
1197                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1198         }
1199
1200         public function delete( $table, $conds, $fname = __METHOD__ ) {
1201                 if ( is_array( $conds ) ) {
1202                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1203                 }
1204                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1205                 // all deletions on these tables have transactions so final failure rollbacks these updates
1206                 $table = $this->tableName( $table );
1207                 if ( $table == $this->tableName( 'user' ) ) {
1208                         $this->update( 'archive', [ 'ar_user' => 0 ],
1209                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1210                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1211                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1212                         $this->update( 'image', [ 'img_user' => 0 ],
1213                                 [ 'img_user' => $conds['user_id'] ], $fname );
1214                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1215                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1216                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1217                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1218                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1219                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1220                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1221                                 [ 'us_user' => $conds['user_id'] ], $fname );
1222                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1223                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1224                         $this->update( 'logging', [ 'log_user' => 0 ],
1225                                 [ 'log_user' => $conds['user_id'] ], $fname );
1226                 } elseif ( $table == $this->tableName( 'image' ) ) {
1227                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1228                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1229                 }
1230
1231                 return parent::delete( $table, $conds, $fname );
1232         }
1233
1234         /**
1235          * @param string $table
1236          * @param array $values
1237          * @param array $conds
1238          * @param string $fname
1239          * @param array $options
1240          * @return bool
1241          * @throws DBUnexpectedError
1242          */
1243         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1244                 global $wgContLang;
1245
1246                 $table = $this->tableName( $table );
1247                 $opts = $this->makeUpdateOptions( $options );
1248                 $sql = "UPDATE $opts $table SET ";
1249
1250                 $first = true;
1251                 foreach ( $values as $col => &$val ) {
1252                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1253
1254                         if ( !$first ) {
1255                                 $sqlSet = ', ' . $sqlSet;
1256                         } else {
1257                                 $first = false;
1258                         }
1259                         $sql .= $sqlSet;
1260                 }
1261
1262                 if ( $conds !== [] && $conds !== '*' ) {
1263                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1264                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1265                 }
1266
1267                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1268                 if ( $stmt === false ) {
1269                         $e = oci_error( $this->mConn );
1270                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1271
1272                         return false;
1273                 }
1274                 foreach ( $values as $col => &$val ) {
1275                         $col_info = $this->fieldInfoMulti( $table, $col );
1276                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1277
1278                         if ( $val === null ) {
1279                                 // do nothing ... null was inserted in statement creation
1280                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1281                                 if ( is_object( $val ) ) {
1282                                         $val = $val->getData();
1283                                 }
1284
1285                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1286                                         $val = '31-12-2030 12:00:00.000000';
1287                                 }
1288
1289                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1290                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1291                                         $e = oci_error( $stmt );
1292                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1293
1294                                         return false;
1295                                 }
1296                         } else {
1297                                 /** @var OCI_Lob[] $lob */
1298                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1299                                 if ( $lob[$col] === false ) {
1300                                         $e = oci_error( $stmt );
1301                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1302                                 }
1303
1304                                 if ( is_object( $val ) ) {
1305                                         $val = $val->getData();
1306                                 }
1307
1308                                 if ( $col_type == 'BLOB' ) {
1309                                         $lob[$col]->writeTemporary( $val );
1310                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1311                                 } else {
1312                                         $lob[$col]->writeTemporary( $val );
1313                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1314                                 }
1315                         }
1316                 }
1317
1318                 MediaWiki\suppressWarnings();
1319
1320                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1321                         $e = oci_error( $stmt );
1322                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1323                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1324
1325                                 return false;
1326                         } else {
1327                                 $this->mAffectedRows = oci_num_rows( $stmt );
1328                         }
1329                 } else {
1330                         $this->mAffectedRows = oci_num_rows( $stmt );
1331                 }
1332
1333                 MediaWiki\restoreWarnings();
1334
1335                 if ( isset( $lob ) ) {
1336                         foreach ( $lob as $lob_v ) {
1337                                 $lob_v->free();
1338                         }
1339                 }
1340
1341                 if ( !$this->mTrxLevel ) {
1342                         oci_commit( $this->mConn );
1343                 }
1344
1345                 return oci_free_statement( $stmt );
1346         }
1347
1348         function bitNot( $field ) {
1349                 // expecting bit-fields smaller than 4bytes
1350                 return 'BITNOT(' . $field . ')';
1351         }
1352
1353         function bitAnd( $fieldLeft, $fieldRight ) {
1354                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1355         }
1356
1357         function bitOr( $fieldLeft, $fieldRight ) {
1358                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1359         }
1360
1361         function getDBname() {
1362                 return $this->mDBname;
1363         }
1364
1365         function getServer() {
1366                 return $this->mServer;
1367         }
1368
1369         public function buildGroupConcatField(
1370                 $delim, $table, $field, $conds = '', $join_conds = []
1371         ) {
1372                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1373
1374                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1375         }
1376
1377         /**
1378          * @param string $field Field or column to cast
1379          * @return string
1380          * @since 1.28
1381          */
1382         public function buildStringCast( $field ) {
1383                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1384         }
1385
1386         public function getInfinity() {
1387                 return '31-12-2030 12:00:00.000000';
1388         }
1389 }