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         protected function doQuery( $sql ) {
 188                 wfDebug( "SQL: [$sql]\n" );
 189                 if ( !StringUtils::isUtf8( $sql ) ) {
 190                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 191                 }
 192
 193                 // handle some oracle specifics
 194                 // remove AS column/table/subquery namings
 195                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 196                         $sql = preg_replace( '/ as /i', ' ', $sql );
 197                 }
 198
 199                 // Oracle has issues with UNION clause if the statement includes LOB fields
 200                 // So we do a UNION ALL and then filter the results array with array_unique
 201                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 202                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 203                 // you have to select data from plan table after explain
 204                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 205
 206                 $sql = preg_replace(
 207                         '/^EXPLAIN /',
 208                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 209                         $sql,
 210                         1,
 211                         $explain_count
 212                 );
 213
 214                 Wikimedia\suppressWarnings();
 215
 216                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 217                 if ( $stmt === false ) {
 218                         $e = oci_error( $this->conn );
 219                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 220
 221                         return false;
 222                 }
 223
 224                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 225                         $e = oci_error( $stmt );
 226                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 227                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 228
 229                                 return false;
 230                         }
 231                 }
 232
 233                 Wikimedia\restoreWarnings();
 234
 235                 if ( $explain_count > 0 ) {
 236                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 237                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 238                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 239                         return new ORAResult( $this, $stmt, $union_unique );
 240                 } else {
 241                         $this->mAffectedRows = oci_num_rows( $stmt );
 242
 243                         return true;
 244                 }
 245         }
 246
 247         function queryIgnore( $sql, $fname = '' ) {
 248                 return $this->query( $sql, $fname, true );
 249         }
 250
 251         /**
 252          * Frees resources associated with the LOB descriptor
 253          * @param ResultWrapper|ORAResult $res
 254          */
 255         function freeResult( $res ) {
 256                 if ( $res instanceof ResultWrapper ) {
 257                         $res = $res->result;
 258                 }
 259
 260                 $res->free();
 261         }
 262
 263         /**
 264          * @param ResultWrapper|ORAResult $res
 265          * @return mixed
 266          */
 267         function fetchObject( $res ) {
 268                 if ( $res instanceof ResultWrapper ) {
 269                         $res = $res->result;
 270                 }
 271
 272                 return $res->fetchObject();
 273         }
 274
 275         /**
 276          * @param ResultWrapper|ORAResult $res
 277          * @return mixed
 278          */
 279         function fetchRow( $res ) {
 280                 if ( $res instanceof ResultWrapper ) {
 281                         $res = $res->result;
 282                 }
 283
 284                 return $res->fetchRow();
 285         }
 286
 287         /**
 288          * @param ResultWrapper|ORAResult $res
 289          * @return int
 290          */
 291         function numRows( $res ) {
 292                 if ( $res instanceof ResultWrapper ) {
 293                         $res = $res->result;
 294                 }
 295
 296                 return $res->numRows();
 297         }
 298
 299         /**
 300          * @param ResultWrapper|ORAResult $res
 301          * @return int
 302          */
 303         function numFields( $res ) {
 304                 if ( $res instanceof ResultWrapper ) {
 305                         $res = $res->result;
 306                 }
 307
 308                 return $res->numFields();
 309         }
 310
 311         function fieldName( $stmt, $n ) {
 312                 return oci_field_name( $stmt, $n );
 313         }
 314
 315         function insertId() {
 316                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 317                 $row = $this->fetchRow( $res );
 318                 return is_null( $row[0] ) ? null : (int)$row[0];
 319         }
 320
 321         /**
 322          * @param mixed $res
 323          * @param int $row
 324          */
 325         function dataSeek( $res, $row ) {
 326                 if ( $res instanceof ORAResult ) {
 327                         $res->seek( $row );
 328                 } else {
 329                         $res->result->seek( $row );
 330                 }
 331         }
 332
 333         function lastError() {
 334                 if ( $this->conn === false ) {
 335                         $e = oci_error();
 336                 } else {
 337                         $e = oci_error( $this->conn );
 338                 }
 339
 340                 return $e['message'];
 341         }
 342
 343         function lastErrno() {
 344                 if ( $this->conn === false ) {
 345                         $e = oci_error();
 346                 } else {
 347                         $e = oci_error( $this->conn );
 348                 }
 349
 350                 return $e['code'];
 351         }
 352
 353         protected function fetchAffectedRowCount() {
 354                 return $this->mAffectedRows;
 355         }
 356
 357         /**
 358          * Returns information about an index
 359          * If errors are explicitly ignored, returns NULL on failure
 360          * @param string $table
 361          * @param string $index
 362          * @param string $fname
 363          * @return bool
 364          */
 365         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 366                 return false;
 367         }
 368
 369         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 370                 return false;
 371         }
 372
 373         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 374                 if ( !count( $a ) ) {
 375                         return true;
 376                 }
 377
 378                 if ( !is_array( $options ) ) {
 379                         $options = [ $options ];
 380                 }
 381
 382                 if ( in_array( 'IGNORE', $options ) ) {
 383                         $this->ignoreDupValOnIndex = true;
 384                 }
 385
 386                 if ( !is_array( reset( $a ) ) ) {
 387                         $a = [ $a ];
 388                 }
 389
 390                 foreach ( $a as &$row ) {
 391                         $this->insertOneRow( $table, $row, $fname );
 392                 }
 393
 394                 if ( in_array( 'IGNORE', $options ) ) {
 395                         $this->ignoreDupValOnIndex = false;
 396                 }
 397
 398                 return true;
 399         }
 400
 401         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 402                 $col_info = $this->fieldInfoMulti( $table, $col );
 403                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 404
 405                 $bind = '';
 406                 if ( is_numeric( $col ) ) {
 407                         $bind = $val;
 408                         $val = null;
 409
 410                         return $bind;
 411                 } elseif ( $includeCol ) {
 412                         $bind = "$col = ";
 413                 }
 414
 415                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 416                         $val = null;
 417                 }
 418
 419                 if ( $val === 'NULL' ) {
 420                         $val = null;
 421                 }
 422
 423                 if ( $val === null ) {
 424                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 425                                 $bind .= 'DEFAULT';
 426                         } else {
 427                                 $bind .= 'NULL';
 428                         }
 429                 } else {
 430                         $bind .= ':' . $col;
 431                 }
 432
 433                 return $bind;
 434         }
 435
 436         /**
 437          * @param string $table
 438          * @param array $row
 439          * @param string $fname
 440          * @return bool
 441          * @throws DBUnexpectedError
 442          */
 443         private function insertOneRow( $table, $row, $fname ) {
 444                 $table = $this->tableName( $table );
 445                 // "INSERT INTO tables (a, b, c)"
 446                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 447                 $sql .= " VALUES (";
 448
 449                 // for each value, append ":key"
 450                 $first = true;
 451                 foreach ( $row as $col => &$val ) {
 452                         if ( !$first ) {
 453                                 $sql .= ', ';
 454                         } else {
 455                                 $first = false;
 456                         }
 457                         if ( $this->isQuotedIdentifier( $val ) ) {
 458                                 $sql .= $this->removeIdentifierQuotes( $val );
 459                                 unset( $row[$col] );
 460                         } else {
 461                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 462                         }
 463                 }
 464                 $sql .= ')';
 465
 466                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 467                 if ( $stmt === false ) {
 468                         $e = oci_error( $this->conn );
 469                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 470
 471                         return false;
 472                 }
 473                 foreach ( $row as $col => &$val ) {
 474                         $col_info = $this->fieldInfoMulti( $table, $col );
 475                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 476
 477                         if ( $val === null ) {
 478                                 // do nothing ... null was inserted in statement creation
 479                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 480                                 if ( is_object( $val ) ) {
 481                                         $val = $val->fetch();
 482                                 }
 483
 484                                 // backward compatibility
 485                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 486                                         $val = $this->getInfinity();
 487                                 }
 488
 489                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
 490                                         checkTitleEncoding( $val );
 491                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 492                                         $e = oci_error( $stmt );
 493                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 494
 495                                         return false;
 496                                 }
 497                         } else {
 498                                 /** @var OCI_Lob[] $lob */
 499                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 500                                 if ( $lob[$col] === false ) {
 501                                         $e = oci_error( $stmt );
 502                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 503                                 }
 504
 505                                 if ( is_object( $val ) ) {
 506                                         $val = $val->fetch();
 507                                 }
 508
 509                                 if ( $col_type == 'BLOB' ) {
 510                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 511                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 512                                 } else {
 513                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 514                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 515                                 }
 516                         }
 517                 }
 518
 519                 Wikimedia\suppressWarnings();
 520
 521                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 522                         $e = oci_error( $stmt );
 523                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 524                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 525
 526                                 return false;
 527                         } else {
 528                                 $this->mAffectedRows = oci_num_rows( $stmt );
 529                         }
 530                 } else {
 531                         $this->mAffectedRows = oci_num_rows( $stmt );
 532                 }
 533
 534                 Wikimedia\restoreWarnings();
 535
 536                 if ( isset( $lob ) ) {
 537                         foreach ( $lob as $lob_v ) {
 538                                 $lob_v->free();
 539                         }
 540                 }
 541
 542                 if ( !$this->trxLevel ) {
 543                         oci_commit( $this->conn );
 544                 }
 545
 546                 return oci_free_statement( $stmt );
 547         }
 548
 549         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 550                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 551         ) {
 552                 $destTable = $this->tableName( $destTable );
 553
 554                 $sequenceData = $this->getSequenceData( $destTable );
 555                 if ( $sequenceData !== false &&
 556                         !isset( $varMap[$sequenceData['column']] )
 557                 ) {
 558                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 559                 }
 560
 561                 // count-alias subselect fields to avoid abigious definition errors
 562                 $i = 0;
 563                 foreach ( $varMap as &$val ) {
 564                         $val = $val . ' field' . ( $i++ );
 565                 }
 566
 567                 $selectSql = $this->selectSQLText(
 568                         $srcTable,
 569                         array_values( $varMap ),
 570                         $conds,
 571                         $fname,
 572                         $selectOptions,
 573                         $selectJoinConds
 574                 );
 575
 576                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 577
 578                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 579                         $this->ignoreDupValOnIndex = true;
 580                 }
 581
 582                 $this->query( $sql, $fname );
 583
 584                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 585                         $this->ignoreDupValOnIndex = false;
 586                 }
 587         }
 588
 589         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 590                 $fname = __METHOD__
 591         ) {
 592                 if ( $rows === [] ) {
 593                         return true; // nothing to do
 594                 }
 595
 596                 if ( !is_array( reset( $rows ) ) ) {
 597                         $rows = [ $rows ];
 598                 }
 599
 600                 $sequenceData = $this->getSequenceData( $table );
 601                 if ( $sequenceData !== false ) {
 602                         // add sequence column to each list of columns, when not set
 603                         foreach ( $rows as &$row ) {
 604                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 605                                         $row[$sequenceData['column']] =
 606                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 607                                                         $sequenceData['sequence'] . '\')' );
 608                                 }
 609                         }
 610                 }
 611
 612                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 613         }
 614
 615         function tableName( $name, $format = 'quoted' ) {
 616                 /*
 617                 Replace reserved words with better ones
 618                 Using uppercase because that's the only way Oracle can handle
 619                 quoted tablenames
 620                 */
 621                 switch ( $name ) {
 622                         case 'user':
 623                                 $name = 'MWUSER';
 624                                 break;
 625                         case 'text':
 626                                 $name = 'PAGECONTENT';
 627                                 break;
 628                 }
 629
 630                 return strtoupper( parent::tableName( $name, $format ) );
 631         }
 632
 633         function tableNameInternal( $name ) {
 634                 $name = $this->tableName( $name );
 635
 636                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 637         }
 638
 639         /**
 640          * Return sequence_name if table has a sequence
 641          *
 642          * @param string $table
 643          * @return bool
 644          */
 645         private function getSequenceData( $table ) {
 646                 if ( $this->sequenceData == null ) {
 647                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 648                                 lower(atc.table_name),
 649                                 lower(atc.column_name)
 650                         FROM all_sequences asq, all_tab_columns atc
 651                         WHERE decode(
 652                                         atc.table_name,
 653                                         '{$this->tablePrefix}MWUSER',
 654                                         '{$this->tablePrefix}USER',
 655                                         atc.table_name
 656                                 ) || '_' ||
 657                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 658                                 AND asq.sequence_owner = upper('{$this->getDBname()}')
 659                                 AND atc.owner = upper('{$this->getDBname()}')" );
 660
 661                         while ( ( $row = $result->fetchRow() ) !== false ) {
 662                                 $this->sequenceData[$row[1]] = [
 663                                         'sequence' => $row[0],
 664                                         'column' => $row[2]
 665                                 ];
 666                         }
 667                 }
 668                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 669
 670                 return $this->sequenceData[$table] ?? false;
 671         }
 672
 673         /**
 674          * Returns the size of a text field, or -1 for "unlimited"
 675          *
 676          * @param string $table
 677          * @param string $field
 678          * @return mixed
 679          */
 680         function textFieldSize( $table, $field ) {
 681                 $fieldInfoData = $this->fieldInfo( $table, $field );
 682
 683                 return $fieldInfoData->maxLength();
 684         }
 685
 686         function limitResult( $sql, $limit, $offset = false ) {
 687                 if ( $offset === false ) {
 688                         $offset = 0;
 689                 }
 690
 691                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 692         }
 693
 694         function encodeBlob( $b ) {
 695                 return new Blob( $b );
 696         }
 697
 698         function decodeBlob( $b ) {
 699                 if ( $b instanceof Blob ) {
 700                         $b = $b->fetch();
 701                 }
 702
 703                 return $b;
 704         }
 705
 706         function unionQueries( $sqls, $all ) {
 707                 $glue = ' UNION ALL ';
 708
 709                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 710                         'FROM (' . implode( $glue, $sqls ) . ')';
 711         }
 712
 713         function wasDeadlock() {
 714                 return $this->lastErrno() == 'OCI-00060';
 715         }
 716
 717         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 718                 $fname = __METHOD__
 719         ) {
 720                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 721
 722                 $newName = strtoupper( $newName );
 723                 $oldName = strtoupper( $oldName );
 724
 725                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 726                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 727                 $newPrefix = strtoupper( $this->tablePrefix );
 728
 729                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 730                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 731         }
 732
 733         function listTables( $prefix = null, $fname = __METHOD__ ) {
 734                 $listWhere = '';
 735                 if ( !empty( $prefix ) ) {
 736                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 737                 }
 738
 739                 $owner = strtoupper( $this->getDBname() );
 740                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 741                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 742
 743                 // dirty code ... i know
 744                 $endArray = [];
 745                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 746                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 747                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 748                 $fixedOrderTabs = $endArray;
 749                 while ( ( $row = $result->fetchRow() ) !== false ) {
 750                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 751                                 $endArray[] = $row['table_name'];
 752                         }
 753                 }
 754
 755                 return $endArray;
 756         }
 757
 758         public function dropTable( $tableName, $fName = __METHOD__ ) {
 759                 $tableName = $this->tableName( $tableName );
 760                 if ( !$this->tableExists( $tableName ) ) {
 761                         return false;
 762                 }
 763
 764                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 765         }
 766
 767         function timestamp( $ts = 0 ) {
 768                 return wfTimestamp( TS_ORACLE, $ts );
 769         }
 770
 771         /**
 772          * Return aggregated value function call
 773          *
 774          * @param array $valuedata
 775          * @param string $valuename
 776          * @return mixed
 777          */
 778         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 779                 return $valuedata;
 780         }
 781
 782         /**
 783          * @return string Wikitext of a link to the server software's web site
 784          */
 785         public function getSoftwareLink() {
 786                 return '[{{int:version-db-oracle-url}} Oracle]';
 787         }
 788
 789         /**
 790          * @return string Version information from the database
 791          */
 792         function getServerVersion() {
 793                 // better version number, fallback on driver
 794                 $rset = $this->doQuery(
 795                         'SELECT version FROM product_component_version ' .
 796                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 797                 );
 798                 $row = $rset->fetchRow();
 799                 if ( !$row ) {
 800                         return oci_server_version( $this->conn );
 801                 }
 802
 803                 return $row['version'];
 804         }
 805
 806         /**
 807          * Query whether a given index exists
 808          * @param string $table
 809          * @param string $index
 810          * @param string $fname
 811          * @return bool
 812          */
 813         function indexExists( $table, $index, $fname = __METHOD__ ) {
 814                 $table = $this->tableName( $table );
 815                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 816                 $index = strtoupper( $index );
 817                 $owner = strtoupper( $this->getDBname() );
 818                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 819                 $res = $this->doQuery( $sql );
 820                 if ( $res ) {
 821                         $count = $res->numRows();
 822                         $res->free();
 823                 } else {
 824                         $count = 0;
 825                 }
 826
 827                 return $count != 0;
 828         }
 829
 830         /**
 831          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 832          * @param string $table
 833          * @param string $fname
 834          * @return bool
 835          */
 836         function tableExists( $table, $fname = __METHOD__ ) {
 837                 $table = $this->tableName( $table );
 838                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 839                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 840                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 841                 $res = $this->doQuery( $sql );
 842                 if ( $res && $res->numRows() > 0 ) {
 843                         $exists = true;
 844                 } else {
 845                         $exists = false;
 846                 }
 847
 848                 $res->free();
 849
 850                 return $exists;
 851         }
 852
 853         /**
 854          * Function translates mysql_fetch_field() functionality on ORACLE.
 855          * Caching is present for reducing query time.
 856          * For internal calls. Use fieldInfo for normal usage.
 857          * Returns false if the field doesn't exist
 858          *
 859          * @param array|string $table
 860          * @param string $field
 861          * @return ORAField|ORAResult|false
 862          */
 863         private function fieldInfoMulti( $table, $field ) {
 864                 $field = strtoupper( $field );
 865                 if ( is_array( $table ) ) {
 866                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 867                         $tableWhere = 'IN (';
 868                         foreach ( $table as &$singleTable ) {
 869                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 870                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 871                                         return $this->mFieldInfoCache["$singleTable.$field"];
 872                                 }
 873                                 $tableWhere .= '\'' . $singleTable . '\',';
 874                         }
 875                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 876                 } else {
 877                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 878                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 879                                 return $this->mFieldInfoCache["$table.$field"];
 880                         }
 881                         $tableWhere = '= \'' . $table . '\'';
 882                 }
 883
 884                 $fieldInfoStmt = oci_parse(
 885                         $this->conn,
 886                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 887                                 $tableWhere . ' and column_name = \'' . $field . '\''
 888                 );
 889                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 890                         $e = oci_error( $fieldInfoStmt );
 891                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 892
 893                         return false;
 894                 }
 895                 $res = new ORAResult( $this, $fieldInfoStmt );
 896                 if ( $res->numRows() == 0 ) {
 897                         if ( is_array( $table ) ) {
 898                                 foreach ( $table as &$singleTable ) {
 899                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 900                                 }
 901                         } else {
 902                                 $this->mFieldInfoCache["$table.$field"] = false;
 903                         }
 904                         $fieldInfoTemp = null;
 905                 } else {
 906                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 907                         $table = $fieldInfoTemp->tableName();
 908                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 909                 }
 910                 $res->free();
 911
 912                 return $fieldInfoTemp;
 913         }
 914
 915         /**
 916          * @throws DBUnexpectedError
 917          * @param string $table
 918          * @param string $field
 919          * @return ORAField
 920          */
 921         function fieldInfo( $table, $field ) {
 922                 if ( is_array( $table ) ) {
 923                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 924                 }
 925
 926                 return $this->fieldInfoMulti( $table, $field );
 927         }
 928
 929         protected function doBegin( $fname = __METHOD__ ) {
 930                 $this->trxLevel = 1;
 931                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 932         }
 933
 934         protected function doCommit( $fname = __METHOD__ ) {
 935                 if ( $this->trxLevel ) {
 936                         $ret = oci_commit( $this->conn );
 937                         if ( !$ret ) {
 938                                 throw new DBUnexpectedError( $this, $this->lastError() );
 939                         }
 940                         $this->trxLevel = 0;
 941                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 942                 }
 943         }
 944
 945         protected function doRollback( $fname = __METHOD__ ) {
 946                 if ( $this->trxLevel ) {
 947                         oci_rollback( $this->conn );
 948                         $this->trxLevel = 0;
 949                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 950                 }
 951         }
 952
 953         function sourceStream(
 954                 $fp,
 955                 callable $lineCallback = null,
 956                 callable $resultCallback = null,
 957                 $fname = __METHOD__, callable $inputCallback = null
 958         ) {
 959                 $cmd = '';
 960                 $done = false;
 961                 $dollarquote = false;
 962
 963                 $replacements = [];
 964                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 965                 while ( !feof( $fp ) ) {
 966                         if ( $lineCallback ) {
 967                                 call_user_func( $lineCallback );
 968                         }
 969                         $line = trim( fgets( $fp, 1024 ) );
 970                         $sl = strlen( $line ) - 1;
 971
 972                         if ( $sl < 0 ) {
 973                                 continue;
 974                         }
 975                         if ( $line[0] == '-' && $line[1] == '-' ) {
 976                                 continue;
 977                         }
 978
 979                         // Allow dollar quoting for function declarations
 980                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 981                                 if ( $dollarquote ) {
 982                                         $dollarquote = false;
 983                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 984                                         $done = true;
 985                                 } else {
 986                                         $dollarquote = true;
 987                                 }
 988                         } elseif ( !$dollarquote ) {
 989                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 990                                         $done = true;
 991                                         $line = substr( $line, 0, $sl );
 992                                 }
 993                         }
 994
 995                         if ( $cmd != '' ) {
 996                                 $cmd .= ' ';
 997                         }
 998                         $cmd .= "$line\n";
 999
1000                         if ( $done ) {
1001                                 $cmd = str_replace( ';;', ";", $cmd );
1002                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1003                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1004                                                 $replacements[$defines[2]] = $defines[1];
1005                                         }
1006                                 } else {
1007                                         foreach ( $replacements as $mwVar => $scVar ) {
1008                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1009                                         }
1010
1011                                         $cmd = $this->replaceVars( $cmd );
1012                                         if ( $inputCallback ) {
1013                                                 call_user_func( $inputCallback, $cmd );
1014                                         }
1015                                         $res = $this->doQuery( $cmd );
1016                                         if ( $resultCallback ) {
1017                                                 call_user_func( $resultCallback, $res, $this );
1018                                         }
1019
1020                                         if ( $res === false ) {
1021                                                 $err = $this->lastError();
1022
1023                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1024                                         }
1025                                 }
1026
1027                                 $cmd = '';
1028                                 $done = false;
1029                         }
1030                 }
1031
1032                 return true;
1033         }
1034
1035         protected function doSelectDomain( DatabaseDomain $domain ) {
1036                 if ( $domain->getSchema() !== null ) {
1037                         // We use the *database* aspect of $domain for schema, not the domain schema
1038                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1039                 }
1040
1041                 $database = $domain->getDatabase();
1042                 if ( $database === null || $database === $this->user ) {
1043                         // Backward compatibility
1044                         $this->currentDomain = $domain;
1045
1046                         return true;
1047                 }
1048
1049                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1050                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1051                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1052                 $stmt = oci_parse( $this->conn, $sql );
1053                 Wikimedia\suppressWarnings();
1054                 $success = oci_execute( $stmt );
1055                 Wikimedia\restoreWarnings();
1056                 if ( $success ) {
1057                         // Update that domain fields on success (no exception thrown)
1058                         $this->currentDomain = $domain;
1059                 } else {
1060                         $e = oci_error( $stmt );
1061                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1062                 }
1063
1064                 return true;
1065         }
1066
1067         function strencode( $s ) {
1068                 return str_replace( "'", "''", $s );
1069         }
1070
1071         function addQuotes( $s ) {
1072                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
1073                 if ( isset( $contLang->mLoaded ) && $contLang->mLoaded ) {
1074                         $s = $contLang->checkTitleEncoding( $s );
1075                 }
1076
1077                 return "'" . $this->strencode( $s ) . "'";
1078         }
1079
1080         public function addIdentifierQuotes( $s ) {
1081                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1082                         $s = '/*Q*/' . $s;
1083                 }
1084
1085                 return $s;
1086         }
1087
1088         public function removeIdentifierQuotes( $s ) {
1089                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1090         }
1091
1092         public function isQuotedIdentifier( $s ) {
1093                 return strpos( $s, '/*Q*/' ) !== false;
1094         }
1095
1096         private function wrapFieldForWhere( $table, &$col, &$val ) {
1097                 $col_info = $this->fieldInfoMulti( $table, $col );
1098                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1099                 if ( $col_type == 'CLOB' ) {
1100                         $col = 'TO_CHAR(' . $col . ')';
1101                         $val =
1102                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1103                 } elseif ( $col_type == 'VARCHAR2' ) {
1104                         $val =
1105                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1106                 }
1107         }
1108
1109         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1110                 $conds2 = [];
1111                 foreach ( $conds as $col => $val ) {
1112                         if ( is_array( $val ) ) {
1113                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1114                         } else {
1115                                 if ( is_numeric( $col ) && $parentCol != null ) {
1116                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1117                                 } else {
1118                                         $this->wrapFieldForWhere( $table, $col, $val );
1119                                 }
1120                                 $conds2[$col] = $val;
1121                         }
1122                 }
1123
1124                 return $conds2;
1125         }
1126
1127         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1128                 $options = [], $join_conds = []
1129         ) {
1130                 if ( is_array( $conds ) ) {
1131                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1132                 }
1133
1134                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1135         }
1136
1137         /**
1138          * Returns an optional USE INDEX clause to go after the table, and a
1139          * string to go at the end of the query
1140          *
1141          * @param array $options An associative array of options to be turned into
1142          *   an SQL query, valid keys are listed in the function.
1143          * @return array
1144          */
1145         function makeSelectOptions( $options ) {
1146                 $preLimitTail = $postLimitTail = '';
1147                 $startOpts = '';
1148
1149                 $noKeyOptions = [];
1150                 foreach ( $options as $key => $option ) {
1151                         if ( is_numeric( $key ) ) {
1152                                 $noKeyOptions[$option] = true;
1153                         }
1154                 }
1155
1156                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1157
1158                 $preLimitTail .= $this->makeOrderBy( $options );
1159
1160                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1161                         $postLimitTail .= ' FOR UPDATE';
1162                 }
1163
1164                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1165                         $startOpts .= 'DISTINCT';
1166                 }
1167
1168                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1169                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1170                 } else {
1171                         $useIndex = '';
1172                 }
1173
1174                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1175                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1176                 } else {
1177                         $ignoreIndex = '';
1178                 }
1179
1180                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1181         }
1182
1183         public function delete( $table, $conds, $fname = __METHOD__ ) {
1184                 global $wgActorTableSchemaMigrationStage;
1185
1186                 if ( is_array( $conds ) ) {
1187                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1188                 }
1189                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1190                 // all deletions on these tables have transactions so final failure rollbacks these updates
1191                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1192                 $table = $this->tableName( $table );
1193                 if ( $table == $this->tableName( 'user' ) &&
1194                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1195                 ) {
1196                         $this->update( 'archive', [ 'ar_user' => 0 ],
1197                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1198                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1199                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1200                         $this->update( 'image', [ 'img_user' => 0 ],
1201                                 [ 'img_user' => $conds['user_id'] ], $fname );
1202                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1203                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1204                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1205                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1206                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1207                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1208                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1209                                 [ 'us_user' => $conds['user_id'] ], $fname );
1210                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1211                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1212                         $this->update( 'logging', [ 'log_user' => 0 ],
1213                                 [ 'log_user' => $conds['user_id'] ], $fname );
1214                 } elseif ( $table == $this->tableName( 'image' ) ) {
1215                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1216                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1217                 }
1218
1219                 return parent::delete( $table, $conds, $fname );
1220         }
1221
1222         /**
1223          * @param string $table
1224          * @param array $values
1225          * @param array $conds
1226          * @param string $fname
1227          * @param array $options
1228          * @return bool
1229          * @throws DBUnexpectedError
1230          */
1231         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1232                 $table = $this->tableName( $table );
1233                 $opts = $this->makeUpdateOptions( $options );
1234                 $sql = "UPDATE $opts $table SET ";
1235
1236                 $first = true;
1237                 foreach ( $values as $col => &$val ) {
1238                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1239
1240                         if ( !$first ) {
1241                                 $sqlSet = ', ' . $sqlSet;
1242                         } else {
1243                                 $first = false;
1244                         }
1245                         $sql .= $sqlSet;
1246                 }
1247
1248                 if ( $conds !== [] && $conds !== '*' ) {
1249                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1250                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1251                 }
1252
1253                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1254                 if ( $stmt === false ) {
1255                         $e = oci_error( $this->conn );
1256                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1257
1258                         return false;
1259                 }
1260                 foreach ( $values as $col => &$val ) {
1261                         $col_info = $this->fieldInfoMulti( $table, $col );
1262                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1263
1264                         if ( $val === null ) {
1265                                 // do nothing ... null was inserted in statement creation
1266                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1267                                 if ( is_object( $val ) ) {
1268                                         $val = $val->getData();
1269                                 }
1270
1271                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1272                                         $val = '31-12-2030 12:00:00.000000';
1273                                 }
1274
1275                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
1276                                         checkTitleEncoding( $val );
1277                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1278                                         $e = oci_error( $stmt );
1279                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1280
1281                                         return false;
1282                                 }
1283                         } else {
1284                                 /** @var OCI_Lob[] $lob */
1285                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1286                                 if ( $lob[$col] === false ) {
1287                                         $e = oci_error( $stmt );
1288                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1289                                 }
1290
1291                                 if ( is_object( $val ) ) {
1292                                         $val = $val->getData();
1293                                 }
1294
1295                                 if ( $col_type == 'BLOB' ) {
1296                                         $lob[$col]->writeTemporary( $val );
1297                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1298                                 } else {
1299                                         $lob[$col]->writeTemporary( $val );
1300                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1301                                 }
1302                         }
1303                 }
1304
1305                 Wikimedia\suppressWarnings();
1306
1307                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1308                         $e = oci_error( $stmt );
1309                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1310                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1311
1312                                 return false;
1313                         } else {
1314                                 $this->mAffectedRows = oci_num_rows( $stmt );
1315                         }
1316                 } else {
1317                         $this->mAffectedRows = oci_num_rows( $stmt );
1318                 }
1319
1320                 Wikimedia\restoreWarnings();
1321
1322                 if ( isset( $lob ) ) {
1323                         foreach ( $lob as $lob_v ) {
1324                                 $lob_v->free();
1325                         }
1326                 }
1327
1328                 if ( !$this->trxLevel ) {
1329                         oci_commit( $this->conn );
1330                 }
1331
1332                 return oci_free_statement( $stmt );
1333         }
1334
1335         function bitNot( $field ) {
1336                 // expecting bit-fields smaller than 4bytes
1337                 return 'BITNOT(' . $field . ')';
1338         }
1339
1340         function bitAnd( $fieldLeft, $fieldRight ) {
1341                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1342         }
1343
1344         function bitOr( $fieldLeft, $fieldRight ) {
1345                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1346         }
1347
1348         function getServer() {
1349                 return $this->server;
1350         }
1351
1352         public function buildGroupConcatField(
1353                 $delim, $table, $field, $conds = '', $join_conds = []
1354         ) {
1355                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1356
1357                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1358         }
1359
1360         public function buildSubstring( $input, $startPosition, $length = null ) {
1361                 $this->assertBuildSubstringParams( $startPosition, $length );
1362                 $params = [ $input, $startPosition ];
1363                 if ( $length !== null ) {
1364                         $params[] = $length;
1365                 }
1366                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1367         }
1368
1369         /**
1370          * @param string $field Field or column to cast
1371          * @return string
1372          * @since 1.28
1373          */
1374         public function buildStringCast( $field ) {
1375                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1376         }
1377
1378         public function getInfinity() {
1379                 return '31-12-2030 12:00:00.000000';
1380         }
1381 }