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 MediaWiki\MediaWikiServices;
  25 use Wikimedia\Rdbms\Database;
  26 use Wikimedia\Rdbms\DatabaseDomain;
  27 use Wikimedia\Rdbms\Blob;
  28 use Wikimedia\Rdbms\ResultWrapper;
  29 use Wikimedia\Rdbms\DBConnectionError;
  30 use Wikimedia\Rdbms\DBUnexpectedError;
  31 use Wikimedia\Rdbms\DBExpectedError;
  32
  33 /**
  34  * @ingroup Database
  35  */
  36 class DatabaseOracle extends Database {
  37         /** @var resource */
  38         protected $mLastResult = null;
  39
  40         /** @var int The number of rows affected as an integer */
  41         protected $mAffectedRows;
  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->opened ) {
  68                         Wikimedia\suppressWarnings();
  69                         $this->close();
  70                         Wikimedia\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         protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
  87                 global $wgDBOracleDRCP;
  88
  89                 if ( !function_exists( 'oci_connect' ) ) {
  90                         throw new DBConnectionError(
  91                                 $this,
  92                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  93                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  94                                         "and database)\n" );
  95                 }
  96
  97                 $this->close();
  98                 $this->user = $user;
  99                 $this->password = $password;
 100                 if ( !$server ) {
 101                         // Backward compatibility (server used to be null and TNS was supplied in dbname)
 102                         $this->server = $dbName;
 103                         $realDatabase = $user;
 104                 } else {
 105                         // $server now holds the TNS endpoint
 106                         $this->server = $server;
 107                         // $dbName is schema name if different from username
 108                         $realDatabase = $dbName ?: $user;
 109                 }
 110
 111                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 112                         return null;
 113                 }
 114
 115                 if ( $wgDBOracleDRCP ) {
 116                         $this->setFlag( DBO_PERSISTENT );
 117                 }
 118
 119                 $session_mode = $this->flags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 120
 121                 Wikimedia\suppressWarnings();
 122                 if ( $this->flags & DBO_PERSISTENT ) {
 123                         $this->conn = oci_pconnect(
 124                                 $this->user,
 125                                 $this->password,
 126                                 $this->server,
 127                                 $this->defaultCharset,
 128                                 $session_mode
 129                         );
 130                 } elseif ( $this->flags & DBO_DEFAULT ) {
 131                         $this->conn = oci_new_connect(
 132                                 $this->user,
 133                                 $this->password,
 134                                 $this->server,
 135                                 $this->defaultCharset,
 136                                 $session_mode
 137                         );
 138                 } else {
 139                         $this->conn = oci_connect(
 140                                 $this->user,
 141                                 $this->password,
 142                                 $this->server,
 143                                 $this->defaultCharset,
 144                                 $session_mode
 145                         );
 146                 }
 147                 Wikimedia\restoreWarnings();
 148
 149                 if ( $this->user != $realDatabase ) {
 150                         // change current schema in session
 151                         $this->selectDB( $realDatabase );
 152                 } else {
 153                         $this->currentDomain = new DatabaseDomain(
 154                                 $realDatabase,
 155                                 null,
 156                                 $tablePrefix
 157                         );
 158                 }
 159
 160                 if ( !$this->conn ) {
 161                         throw new DBConnectionError( $this, $this->lastError() );
 162                 }
 163
 164                 $this->opened = true;
 165
 166                 # removed putenv calls because they interfere with the system globaly
 167                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 168                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 169                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 170
 171                 return (bool)$this->conn;
 172         }
 173
 174         /**
 175          * Closes a database connection, if it is open
 176          * Returns success, true if already closed
 177          * @return bool
 178          */
 179         protected function closeConnection() {
 180                 return oci_close( $this->conn );
 181         }
 182
 183         function execFlags() {
 184                 return $this->trxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 185         }
 186
 187         /**
 188          * @param string $sql
 189          * @return bool|mixed|ORAResult
 190          */
 191         protected function doQuery( $sql ) {
 192                 wfDebug( "SQL: [$sql]\n" );
 193                 if ( !StringUtils::isUtf8( $sql ) ) {
 194                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 195                 }
 196
 197                 // handle some oracle specifics
 198                 // remove AS column/table/subquery namings
 199                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 200                         $sql = preg_replace( '/ as /i', ' ', $sql );
 201                 }
 202
 203                 // Oracle has issues with UNION clause if the statement includes LOB fields
 204                 // So we do a UNION ALL and then filter the results array with array_unique
 205                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 206                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 207                 // you have to select data from plan table after explain
 208                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 209
 210                 $sql = preg_replace(
 211                         '/^EXPLAIN /',
 212                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 213                         $sql,
 214                         1,
 215                         $explain_count
 216                 );
 217
 218                 Wikimedia\suppressWarnings();
 219
 220                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 221                 if ( $stmt === false ) {
 222                         $e = oci_error( $this->conn );
 223                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 224
 225                         return false;
 226                 }
 227
 228                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 229                         $e = oci_error( $stmt );
 230                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 231                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 232
 233                                 return false;
 234                         }
 235                 }
 236
 237                 Wikimedia\restoreWarnings();
 238
 239                 if ( $explain_count > 0 ) {
 240                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 241                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 242                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 243                         return new ORAResult( $this, $stmt, $union_unique );
 244                 } else {
 245                         $this->mAffectedRows = oci_num_rows( $stmt );
 246
 247                         return true;
 248                 }
 249         }
 250
 251         function queryIgnore( $sql, $fname = '' ) {
 252                 return $this->query( $sql, $fname, true );
 253         }
 254
 255         /**
 256          * Frees resources associated with the LOB descriptor
 257          * @param ResultWrapper|ORAResult $res
 258          */
 259         function freeResult( $res ) {
 260                 if ( $res instanceof ResultWrapper ) {
 261                         $res = $res->result;
 262                 }
 263
 264                 $res->free();
 265         }
 266
 267         /**
 268          * @param ResultWrapper|ORAResult $res
 269          * @return mixed
 270          */
 271         function fetchObject( $res ) {
 272                 if ( $res instanceof ResultWrapper ) {
 273                         $res = $res->result;
 274                 }
 275
 276                 return $res->fetchObject();
 277         }
 278
 279         /**
 280          * @param ResultWrapper|ORAResult $res
 281          * @return mixed
 282          */
 283         function fetchRow( $res ) {
 284                 if ( $res instanceof ResultWrapper ) {
 285                         $res = $res->result;
 286                 }
 287
 288                 return $res->fetchRow();
 289         }
 290
 291         /**
 292          * @param ResultWrapper|ORAResult $res
 293          * @return int
 294          */
 295         function numRows( $res ) {
 296                 if ( $res instanceof ResultWrapper ) {
 297                         $res = $res->result;
 298                 }
 299
 300                 return $res->numRows();
 301         }
 302
 303         /**
 304          * @param ResultWrapper|ORAResult $res
 305          * @return int
 306          */
 307         function numFields( $res ) {
 308                 if ( $res instanceof ResultWrapper ) {
 309                         $res = $res->result;
 310                 }
 311
 312                 return $res->numFields();
 313         }
 314
 315         function fieldName( $stmt, $n ) {
 316                 return oci_field_name( $stmt, $n );
 317         }
 318
 319         function insertId() {
 320                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 321                 $row = $this->fetchRow( $res );
 322                 return is_null( $row[0] ) ? null : (int)$row[0];
 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->conn === false ) {
 339                         $e = oci_error();
 340                 } else {
 341                         $e = oci_error( $this->conn );
 342                 }
 343
 344                 return $e['message'];
 345         }
 346
 347         function lastErrno() {
 348                 if ( $this->conn === false ) {
 349                         $e = oci_error();
 350                 } else {
 351                         $e = oci_error( $this->conn );
 352                 }
 353
 354                 return $e['code'];
 355         }
 356
 357         protected function fetchAffectedRowCount() {
 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
 398                 if ( in_array( 'IGNORE', $options ) ) {
 399                         $this->ignoreDupValOnIndex = false;
 400                 }
 401
 402                 return true;
 403         }
 404
 405         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 406                 $col_info = $this->fieldInfoMulti( $table, $col );
 407                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 408
 409                 $bind = '';
 410                 if ( is_numeric( $col ) ) {
 411                         $bind = $val;
 412                         $val = null;
 413
 414                         return $bind;
 415                 } elseif ( $includeCol ) {
 416                         $bind = "$col = ";
 417                 }
 418
 419                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 420                         $val = null;
 421                 }
 422
 423                 if ( $val === 'NULL' ) {
 424                         $val = null;
 425                 }
 426
 427                 if ( $val === null ) {
 428                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 429                                 $bind .= 'DEFAULT';
 430                         } else {
 431                                 $bind .= 'NULL';
 432                         }
 433                 } else {
 434                         $bind .= ':' . $col;
 435                 }
 436
 437                 return $bind;
 438         }
 439
 440         /**
 441          * @param string $table
 442          * @param array $row
 443          * @param string $fname
 444          * @return bool
 445          * @throws DBUnexpectedError
 446          */
 447         private function insertOneRow( $table, $row, $fname ) {
 448                 $table = $this->tableName( $table );
 449                 // "INSERT INTO tables (a, b, c)"
 450                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 451                 $sql .= " VALUES (";
 452
 453                 // for each value, append ":key"
 454                 $first = true;
 455                 foreach ( $row as $col => &$val ) {
 456                         if ( !$first ) {
 457                                 $sql .= ', ';
 458                         } else {
 459                                 $first = false;
 460                         }
 461                         if ( $this->isQuotedIdentifier( $val ) ) {
 462                                 $sql .= $this->removeIdentifierQuotes( $val );
 463                                 unset( $row[$col] );
 464                         } else {
 465                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 466                         }
 467                 }
 468                 $sql .= ')';
 469
 470                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 471                 if ( $stmt === false ) {
 472                         $e = oci_error( $this->conn );
 473                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 474
 475                         return false;
 476                 }
 477                 foreach ( $row as $col => &$val ) {
 478                         $col_info = $this->fieldInfoMulti( $table, $col );
 479                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 480
 481                         if ( $val === null ) {
 482                                 // do nothing ... null was inserted in statement creation
 483                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 484                                 if ( is_object( $val ) ) {
 485                                         $val = $val->fetch();
 486                                 }
 487
 488                                 // backward compatibility
 489                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 490                                         $val = $this->getInfinity();
 491                                 }
 492
 493                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
 494                                         checkTitleEncoding( $val );
 495                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 496                                         $e = oci_error( $stmt );
 497                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 498
 499                                         return false;
 500                                 }
 501                         } else {
 502                                 /** @var OCI_Lob[] $lob */
 503                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 504                                 if ( $lob[$col] === false ) {
 505                                         $e = oci_error( $stmt );
 506                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 507                                 }
 508
 509                                 if ( is_object( $val ) ) {
 510                                         $val = $val->fetch();
 511                                 }
 512
 513                                 if ( $col_type == 'BLOB' ) {
 514                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 515                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 516                                 } else {
 517                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 518                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 519                                 }
 520                         }
 521                 }
 522
 523                 Wikimedia\suppressWarnings();
 524
 525                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 526                         $e = oci_error( $stmt );
 527                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 528                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 529
 530                                 return false;
 531                         } else {
 532                                 $this->mAffectedRows = oci_num_rows( $stmt );
 533                         }
 534                 } else {
 535                         $this->mAffectedRows = oci_num_rows( $stmt );
 536                 }
 537
 538                 Wikimedia\restoreWarnings();
 539
 540                 if ( isset( $lob ) ) {
 541                         foreach ( $lob as $lob_v ) {
 542                                 $lob_v->free();
 543                         }
 544                 }
 545
 546                 if ( !$this->trxLevel ) {
 547                         oci_commit( $this->conn );
 548                 }
 549
 550                 return oci_free_statement( $stmt );
 551         }
 552
 553         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 554                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 555         ) {
 556                 $destTable = $this->tableName( $destTable );
 557
 558                 $sequenceData = $this->getSequenceData( $destTable );
 559                 if ( $sequenceData !== false &&
 560                         !isset( $varMap[$sequenceData['column']] )
 561                 ) {
 562                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 563                 }
 564
 565                 // count-alias subselect fields to avoid abigious definition errors
 566                 $i = 0;
 567                 foreach ( $varMap as &$val ) {
 568                         $val .= ' field' . ( $i++ );
 569                 }
 570
 571                 $selectSql = $this->selectSQLText(
 572                         $srcTable,
 573                         array_values( $varMap ),
 574                         $conds,
 575                         $fname,
 576                         $selectOptions,
 577                         $selectJoinConds
 578                 );
 579
 580                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 581
 582                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 583                         $this->ignoreDupValOnIndex = true;
 584                 }
 585
 586                 $this->query( $sql, $fname );
 587
 588                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 589                         $this->ignoreDupValOnIndex = false;
 590                 }
 591         }
 592
 593         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 594                 $fname = __METHOD__
 595         ) {
 596                 if ( $rows === [] ) {
 597                         return true; // nothing to do
 598                 }
 599
 600                 if ( !is_array( reset( $rows ) ) ) {
 601                         $rows = [ $rows ];
 602                 }
 603
 604                 $sequenceData = $this->getSequenceData( $table );
 605                 if ( $sequenceData !== false ) {
 606                         // add sequence column to each list of columns, when not set
 607                         foreach ( $rows as &$row ) {
 608                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 609                                         $row[$sequenceData['column']] =
 610                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 611                                                         $sequenceData['sequence'] . '\')' );
 612                                 }
 613                         }
 614                 }
 615
 616                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 617         }
 618
 619         function tableName( $name, $format = 'quoted' ) {
 620                 /*
 621                 Replace reserved words with better ones
 622                 Using uppercase because that's the only way Oracle can handle
 623                 quoted tablenames
 624                 */
 625                 switch ( $name ) {
 626                         case 'user':
 627                                 $name = 'MWUSER';
 628                                 break;
 629                         case 'text':
 630                                 $name = 'PAGECONTENT';
 631                                 break;
 632                 }
 633
 634                 return strtoupper( parent::tableName( $name, $format ) );
 635         }
 636
 637         function tableNameInternal( $name ) {
 638                 $name = $this->tableName( $name );
 639
 640                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 641         }
 642
 643         /**
 644          * Return sequence_name if table has a sequence
 645          *
 646          * @param string $table
 647          * @return bool
 648          */
 649         private function getSequenceData( $table ) {
 650                 if ( $this->sequenceData == null ) {
 651                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 652                                 lower(atc.table_name),
 653                                 lower(atc.column_name)
 654                         FROM all_sequences asq, all_tab_columns atc
 655                         WHERE decode(
 656                                         atc.table_name,
 657                                         '{$this->tablePrefix}MWUSER',
 658                                         '{$this->tablePrefix}USER',
 659                                         atc.table_name
 660                                 ) || '_' ||
 661                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 662                                 AND asq.sequence_owner = upper('{$this->getDBname()}')
 663                                 AND atc.owner = upper('{$this->getDBname()}')" );
 664
 665                         while ( ( $row = $result->fetchRow() ) !== false ) {
 666                                 $this->sequenceData[$row[1]] = [
 667                                         'sequence' => $row[0],
 668                                         'column' => $row[2]
 669                                 ];
 670                         }
 671                 }
 672                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 673
 674                 return $this->sequenceData[$table] ?? false;
 675         }
 676
 677         /**
 678          * Returns the size of a text field, or -1 for "unlimited"
 679          *
 680          * @param string $table
 681          * @param string $field
 682          * @return mixed
 683          */
 684         function textFieldSize( $table, $field ) {
 685                 $fieldInfoData = $this->fieldInfo( $table, $field );
 686
 687                 return $fieldInfoData->maxLength();
 688         }
 689
 690         function limitResult( $sql, $limit, $offset = false ) {
 691                 if ( $offset === false ) {
 692                         $offset = 0;
 693                 }
 694
 695                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 696         }
 697
 698         function encodeBlob( $b ) {
 699                 return new Blob( $b );
 700         }
 701
 702         function decodeBlob( $b ) {
 703                 if ( $b instanceof Blob ) {
 704                         $b = $b->fetch();
 705                 }
 706
 707                 return $b;
 708         }
 709
 710         function unionQueries( $sqls, $all ) {
 711                 $glue = ' UNION ALL ';
 712
 713                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 714                         'FROM (' . implode( $glue, $sqls ) . ')';
 715         }
 716
 717         function wasDeadlock() {
 718                 return $this->lastErrno() == 'OCI-00060';
 719         }
 720
 721         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 722                 $fname = __METHOD__
 723         ) {
 724                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 725
 726                 $newName = strtoupper( $newName );
 727                 $oldName = strtoupper( $oldName );
 728
 729                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 730                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 731                 $newPrefix = strtoupper( $this->tablePrefix );
 732
 733                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 734                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 735         }
 736
 737         function listTables( $prefix = null, $fname = __METHOD__ ) {
 738                 $listWhere = '';
 739                 if ( !empty( $prefix ) ) {
 740                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 741                 }
 742
 743                 $owner = strtoupper( $this->getDBname() );
 744                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 745                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 746
 747                 // dirty code ... i know
 748                 $endArray = [];
 749                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 750                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 751                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 752                 $fixedOrderTabs = $endArray;
 753                 while ( ( $row = $result->fetchRow() ) !== false ) {
 754                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 755                                 $endArray[] = $row['table_name'];
 756                         }
 757                 }
 758
 759                 return $endArray;
 760         }
 761
 762         public function dropTable( $tableName, $fName = __METHOD__ ) {
 763                 $tableName = $this->tableName( $tableName );
 764                 if ( !$this->tableExists( $tableName ) ) {
 765                         return false;
 766                 }
 767
 768                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 769         }
 770
 771         function timestamp( $ts = 0 ) {
 772                 return wfTimestamp( TS_ORACLE, $ts );
 773         }
 774
 775         /**
 776          * Return aggregated value function call
 777          *
 778          * @param array $valuedata
 779          * @param string $valuename
 780          * @return mixed
 781          */
 782         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 783                 return $valuedata;
 784         }
 785
 786         /**
 787          * @return string Wikitext of a link to the server software's web site
 788          */
 789         public function getSoftwareLink() {
 790                 return '[{{int:version-db-oracle-url}} Oracle]';
 791         }
 792
 793         /**
 794          * @return string Version information from the database
 795          */
 796         function getServerVersion() {
 797                 // better version number, fallback on driver
 798                 $rset = $this->doQuery(
 799                         'SELECT version FROM product_component_version ' .
 800                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 801                 );
 802                 $row = $rset->fetchRow();
 803                 if ( !$row ) {
 804                         return oci_server_version( $this->conn );
 805                 }
 806
 807                 return $row['version'];
 808         }
 809
 810         /**
 811          * Query whether a given index exists
 812          * @param string $table
 813          * @param string $index
 814          * @param string $fname
 815          * @return bool
 816          */
 817         function indexExists( $table, $index, $fname = __METHOD__ ) {
 818                 $table = $this->tableName( $table );
 819                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 820                 $index = strtoupper( $index );
 821                 $owner = strtoupper( $this->getDBname() );
 822                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 823                 $res = $this->doQuery( $sql );
 824                 if ( $res ) {
 825                         $count = $res->numRows();
 826                         $res->free();
 827                 } else {
 828                         $count = 0;
 829                 }
 830
 831                 return $count != 0;
 832         }
 833
 834         /**
 835          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 836          * @param string $table
 837          * @param string $fname
 838          * @return bool
 839          */
 840         function tableExists( $table, $fname = __METHOD__ ) {
 841                 $table = $this->tableName( $table );
 842                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 843                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 844                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 845                 $res = $this->doQuery( $sql );
 846                 if ( $res && $res->numRows() > 0 ) {
 847                         $exists = true;
 848                 } else {
 849                         $exists = false;
 850                 }
 851
 852                 $res->free();
 853
 854                 return $exists;
 855         }
 856
 857         /**
 858          * Function translates mysql_fetch_field() functionality on ORACLE.
 859          * Caching is present for reducing query time.
 860          * For internal calls. Use fieldInfo for normal usage.
 861          * Returns false if the field doesn't exist
 862          *
 863          * @param array|string $table
 864          * @param string $field
 865          * @return ORAField|ORAResult|false
 866          */
 867         private function fieldInfoMulti( $table, $field ) {
 868                 $field = strtoupper( $field );
 869                 if ( is_array( $table ) ) {
 870                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 871                         $tableWhere = 'IN (';
 872                         foreach ( $table as &$singleTable ) {
 873                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 874                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 875                                         return $this->mFieldInfoCache["$singleTable.$field"];
 876                                 }
 877                                 $tableWhere .= '\'' . $singleTable . '\',';
 878                         }
 879                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 880                 } else {
 881                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 882                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 883                                 return $this->mFieldInfoCache["$table.$field"];
 884                         }
 885                         $tableWhere = '= \'' . $table . '\'';
 886                 }
 887
 888                 $fieldInfoStmt = oci_parse(
 889                         $this->conn,
 890                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 891                                 $tableWhere . ' and column_name = \'' . $field . '\''
 892                 );
 893                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 894                         $e = oci_error( $fieldInfoStmt );
 895                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 896
 897                         return false;
 898                 }
 899                 $res = new ORAResult( $this, $fieldInfoStmt );
 900                 if ( $res->numRows() == 0 ) {
 901                         if ( is_array( $table ) ) {
 902                                 foreach ( $table as &$singleTable ) {
 903                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 904                                 }
 905                         } else {
 906                                 $this->mFieldInfoCache["$table.$field"] = false;
 907                         }
 908                         $fieldInfoTemp = null;
 909                 } else {
 910                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 911                         $table = $fieldInfoTemp->tableName();
 912                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 913                 }
 914                 $res->free();
 915
 916                 return $fieldInfoTemp;
 917         }
 918
 919         /**
 920          * @throws DBUnexpectedError
 921          * @param string $table
 922          * @param string $field
 923          * @return ORAField
 924          */
 925         function fieldInfo( $table, $field ) {
 926                 if ( is_array( $table ) ) {
 927                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 928                 }
 929
 930                 return $this->fieldInfoMulti( $table, $field );
 931         }
 932
 933         protected function doBegin( $fname = __METHOD__ ) {
 934                 $this->trxLevel = 1;
 935                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 936         }
 937
 938         protected function doCommit( $fname = __METHOD__ ) {
 939                 if ( $this->trxLevel ) {
 940                         $ret = oci_commit( $this->conn );
 941                         if ( !$ret ) {
 942                                 throw new DBUnexpectedError( $this, $this->lastError() );
 943                         }
 944                         $this->trxLevel = 0;
 945                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 946                 }
 947         }
 948
 949         protected function doRollback( $fname = __METHOD__ ) {
 950                 if ( $this->trxLevel ) {
 951                         oci_rollback( $this->conn );
 952                         $this->trxLevel = 0;
 953                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 954                 }
 955         }
 956
 957         function sourceStream(
 958                 $fp,
 959                 callable $lineCallback = null,
 960                 callable $resultCallback = null,
 961                 $fname = __METHOD__, callable $inputCallback = null
 962         ) {
 963                 $cmd = '';
 964                 $done = false;
 965                 $dollarquote = false;
 966
 967                 $replacements = [];
 968                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 969                 while ( !feof( $fp ) ) {
 970                         if ( $lineCallback ) {
 971                                 call_user_func( $lineCallback );
 972                         }
 973                         $line = trim( fgets( $fp, 1024 ) );
 974                         $sl = strlen( $line ) - 1;
 975
 976                         if ( $sl < 0 ) {
 977                                 continue;
 978                         }
 979                         if ( $line[0] == '-' && $line[1] == '-' ) {
 980                                 continue;
 981                         }
 982
 983                         // Allow dollar quoting for function declarations
 984                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 985                                 if ( $dollarquote ) {
 986                                         $dollarquote = false;
 987                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 988                                         $done = true;
 989                                 } else {
 990                                         $dollarquote = true;
 991                                 }
 992                         } elseif ( !$dollarquote ) {
 993                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 994                                         $done = true;
 995                                         $line = substr( $line, 0, $sl );
 996                                 }
 997                         }
 998
 999                         if ( $cmd != '' ) {
1000                                 $cmd .= ' ';
1001                         }
1002                         $cmd .= "$line\n";
1003
1004                         if ( $done ) {
1005                                 $cmd = str_replace( ';;', ";", $cmd );
1006                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1007                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1008                                                 $replacements[$defines[2]] = $defines[1];
1009                                         }
1010                                 } else {
1011                                         foreach ( $replacements as $mwVar => $scVar ) {
1012                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1013                                         }
1014
1015                                         $cmd = $this->replaceVars( $cmd );
1016                                         if ( $inputCallback ) {
1017                                                 call_user_func( $inputCallback, $cmd );
1018                                         }
1019                                         $res = $this->doQuery( $cmd );
1020                                         if ( $resultCallback ) {
1021                                                 call_user_func( $resultCallback, $res, $this );
1022                                         }
1023
1024                                         if ( $res === false ) {
1025                                                 $err = $this->lastError();
1026
1027                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1028                                         }
1029                                 }
1030
1031                                 $cmd = '';
1032                                 $done = false;
1033                         }
1034                 }
1035
1036                 return true;
1037         }
1038
1039         protected function doSelectDomain( DatabaseDomain $domain ) {
1040                 if ( $domain->getSchema() !== null ) {
1041                         // We use the *database* aspect of $domain for schema, not the domain schema
1042                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1043                 }
1044
1045                 $database = $domain->getDatabase();
1046                 if ( $database === null || $database === $this->user ) {
1047                         // Backward compatibility
1048                         $this->currentDomain = $domain;
1049
1050                         return true;
1051                 }
1052
1053                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1054                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1055                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1056                 $stmt = oci_parse( $this->conn, $sql );
1057                 Wikimedia\suppressWarnings();
1058                 $success = oci_execute( $stmt );
1059                 Wikimedia\restoreWarnings();
1060                 if ( $success ) {
1061                         // Update that domain fields on success (no exception thrown)
1062                         $this->currentDomain = $domain;
1063                 } else {
1064                         $e = oci_error( $stmt );
1065                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1066                 }
1067
1068                 return true;
1069         }
1070
1071         function strencode( $s ) {
1072                 return str_replace( "'", "''", $s );
1073         }
1074
1075         function addQuotes( $s ) {
1076                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
1077                 if ( isset( $contLang->mLoaded ) && $contLang->mLoaded ) {
1078                         $s = $contLang->checkTitleEncoding( $s );
1079                 }
1080
1081                 return "'" . $this->strencode( $s ) . "'";
1082         }
1083
1084         public function addIdentifierQuotes( $s ) {
1085                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1086                         $s = '/*Q*/' . $s;
1087                 }
1088
1089                 return $s;
1090         }
1091
1092         public function removeIdentifierQuotes( $s ) {
1093                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1094         }
1095
1096         public function isQuotedIdentifier( $s ) {
1097                 return strpos( $s, '/*Q*/' ) !== false;
1098         }
1099
1100         private function wrapFieldForWhere( $table, &$col, &$val ) {
1101                 $col_info = $this->fieldInfoMulti( $table, $col );
1102                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1103                 if ( $col_type == 'CLOB' ) {
1104                         $col = 'TO_CHAR(' . $col . ')';
1105                         $val =
1106                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1107                 } elseif ( $col_type == 'VARCHAR2' ) {
1108                         $val =
1109                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1110                 }
1111         }
1112
1113         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1114                 $conds2 = [];
1115                 foreach ( $conds as $col => $val ) {
1116                         if ( is_array( $val ) ) {
1117                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1118                         } else {
1119                                 if ( is_numeric( $col ) && $parentCol != null ) {
1120                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1121                                 } else {
1122                                         $this->wrapFieldForWhere( $table, $col, $val );
1123                                 }
1124                                 $conds2[$col] = $val;
1125                         }
1126                 }
1127
1128                 return $conds2;
1129         }
1130
1131         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1132                 $options = [], $join_conds = []
1133         ) {
1134                 if ( is_array( $conds ) ) {
1135                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1136                 }
1137
1138                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1139         }
1140
1141         /**
1142          * Returns an optional USE INDEX clause to go after the table, and a
1143          * string to go at the end of the query
1144          *
1145          * @param array $options An associative array of options to be turned into
1146          *   an SQL query, valid keys are listed in the function.
1147          * @return array
1148          */
1149         function makeSelectOptions( $options ) {
1150                 $preLimitTail = $postLimitTail = '';
1151                 $startOpts = '';
1152
1153                 $noKeyOptions = [];
1154                 foreach ( $options as $key => $option ) {
1155                         if ( is_numeric( $key ) ) {
1156                                 $noKeyOptions[$option] = true;
1157                         }
1158                 }
1159
1160                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1161
1162                 $preLimitTail .= $this->makeOrderBy( $options );
1163
1164                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1165                         $postLimitTail .= ' FOR UPDATE';
1166                 }
1167
1168                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1169                         $startOpts .= 'DISTINCT';
1170                 }
1171
1172                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1173                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1174                 } else {
1175                         $useIndex = '';
1176                 }
1177
1178                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1179                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1180                 } else {
1181                         $ignoreIndex = '';
1182                 }
1183
1184                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1185         }
1186
1187         public function delete( $table, $conds, $fname = __METHOD__ ) {
1188                 global $wgActorTableSchemaMigrationStage;
1189
1190                 if ( is_array( $conds ) ) {
1191                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1192                 }
1193                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1194                 // all deletions on these tables have transactions so final failure rollbacks these updates
1195                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1196                 $table = $this->tableName( $table );
1197                 if ( $table == $this->tableName( 'user' ) &&
1198                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1199                 ) {
1200                         $this->update( 'archive', [ 'ar_user' => 0 ],
1201                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1202                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1203                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1204                         $this->update( 'image', [ 'img_user' => 0 ],
1205                                 [ 'img_user' => $conds['user_id'] ], $fname );
1206                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1207                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1208                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1209                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1210                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1211                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1212                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1213                                 [ 'us_user' => $conds['user_id'] ], $fname );
1214                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1215                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1216                         $this->update( 'logging', [ 'log_user' => 0 ],
1217                                 [ 'log_user' => $conds['user_id'] ], $fname );
1218                 } elseif ( $table == $this->tableName( 'image' ) ) {
1219                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1220                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1221                 }
1222
1223                 return parent::delete( $table, $conds, $fname );
1224         }
1225
1226         /**
1227          * @param string $table
1228          * @param array $values
1229          * @param array $conds
1230          * @param string $fname
1231          * @param array $options
1232          * @return bool
1233          * @throws DBUnexpectedError
1234          */
1235         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1236                 $table = $this->tableName( $table );
1237                 $opts = $this->makeUpdateOptions( $options );
1238                 $sql = "UPDATE $opts $table SET ";
1239
1240                 $first = true;
1241                 foreach ( $values as $col => &$val ) {
1242                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1243
1244                         if ( !$first ) {
1245                                 $sqlSet = ', ' . $sqlSet;
1246                         } else {
1247                                 $first = false;
1248                         }
1249                         $sql .= $sqlSet;
1250                 }
1251
1252                 if ( $conds !== [] && $conds !== '*' ) {
1253                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1254                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1255                 }
1256
1257                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1258                 if ( $stmt === false ) {
1259                         $e = oci_error( $this->conn );
1260                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1261
1262                         return false;
1263                 }
1264                 foreach ( $values as $col => &$val ) {
1265                         $col_info = $this->fieldInfoMulti( $table, $col );
1266                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1267
1268                         if ( $val === null ) {
1269                                 // do nothing ... null was inserted in statement creation
1270                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1271                                 if ( is_object( $val ) ) {
1272                                         $val = $val->getData();
1273                                 }
1274
1275                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1276                                         $val = '31-12-2030 12:00:00.000000';
1277                                 }
1278
1279                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
1280                                         checkTitleEncoding( $val );
1281                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1282                                         $e = oci_error( $stmt );
1283                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1284
1285                                         return false;
1286                                 }
1287                         } else {
1288                                 /** @var OCI_Lob[] $lob */
1289                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1290                                 if ( $lob[$col] === false ) {
1291                                         $e = oci_error( $stmt );
1292                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1293                                 }
1294
1295                                 if ( is_object( $val ) ) {
1296                                         $val = $val->getData();
1297                                 }
1298
1299                                 if ( $col_type == 'BLOB' ) {
1300                                         $lob[$col]->writeTemporary( $val );
1301                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1302                                 } else {
1303                                         $lob[$col]->writeTemporary( $val );
1304                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1305                                 }
1306                         }
1307                 }
1308
1309                 Wikimedia\suppressWarnings();
1310
1311                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1312                         $e = oci_error( $stmt );
1313                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1314                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1315
1316                                 return false;
1317                         } else {
1318                                 $this->mAffectedRows = oci_num_rows( $stmt );
1319                         }
1320                 } else {
1321                         $this->mAffectedRows = oci_num_rows( $stmt );
1322                 }
1323
1324                 Wikimedia\restoreWarnings();
1325
1326                 if ( isset( $lob ) ) {
1327                         foreach ( $lob as $lob_v ) {
1328                                 $lob_v->free();
1329                         }
1330                 }
1331
1332                 if ( !$this->trxLevel ) {
1333                         oci_commit( $this->conn );
1334                 }
1335
1336                 return oci_free_statement( $stmt );
1337         }
1338
1339         function bitNot( $field ) {
1340                 // expecting bit-fields smaller than 4bytes
1341                 return 'BITNOT(' . $field . ')';
1342         }
1343
1344         function bitAnd( $fieldLeft, $fieldRight ) {
1345                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1346         }
1347
1348         function bitOr( $fieldLeft, $fieldRight ) {
1349                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1350         }
1351
1352         function getServer() {
1353                 return $this->server;
1354         }
1355
1356         public function buildGroupConcatField(
1357                 $delim, $table, $field, $conds = '', $join_conds = []
1358         ) {
1359                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1360
1361                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1362         }
1363
1364         public function buildSubstring( $input, $startPosition, $length = null ) {
1365                 $this->assertBuildSubstringParams( $startPosition, $length );
1366                 $params = [ $input, $startPosition ];
1367                 if ( $length !== null ) {
1368                         $params[] = $length;
1369                 }
1370                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1371         }
1372
1373         /**
1374          * @param string $field Field or column to cast
1375          * @return string
1376          * @since 1.28
1377          */
1378         public function buildStringCast( $field ) {
1379                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1380         }
1381
1382         public function getInfinity() {
1383                 return '31-12-2030 12:00:00.000000';
1384         }
1385 }