includes/db/DatabaseOracle.php

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