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                         $i++;
 570                 }
 571
 572                 $selectSql = $this->selectSQLText(
 573                         $srcTable,
 574                         array_values( $varMap ),
 575                         $conds,
 576                         $fname,
 577                         $selectOptions,
 578                         $selectJoinConds
 579                 );
 580
 581                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 582
 583                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 584                         $this->ignoreDupValOnIndex = true;
 585                 }
 586
 587                 $this->query( $sql, $fname );
 588
 589                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 590                         $this->ignoreDupValOnIndex = false;
 591                 }
 592         }
 593
 594         public function upsert( $table, array $rows, $uniqueIndexes, array $set,
 595                 $fname = __METHOD__
 596         ) {
 597                 if ( $rows === [] ) {
 598                         return true; // nothing to do
 599                 }
 600
 601                 if ( !is_array( reset( $rows ) ) ) {
 602                         $rows = [ $rows ];
 603                 }
 604
 605                 $sequenceData = $this->getSequenceData( $table );
 606                 if ( $sequenceData !== false ) {
 607                         // add sequence column to each list of columns, when not set
 608                         foreach ( $rows as &$row ) {
 609                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 610                                         $row[$sequenceData['column']] =
 611                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 612                                                         $sequenceData['sequence'] . '\')' );
 613                                 }
 614                         }
 615                 }
 616
 617                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 618         }
 619
 620         function tableName( $name, $format = 'quoted' ) {
 621                 /*
 622                 Replace reserved words with better ones
 623                 Using uppercase because that's the only way Oracle can handle
 624                 quoted tablenames
 625                 */
 626                 switch ( $name ) {
 627                         case 'user':
 628                                 $name = 'MWUSER';
 629                                 break;
 630                         case 'text':
 631                                 $name = 'PAGECONTENT';
 632                                 break;
 633                 }
 634
 635                 return strtoupper( parent::tableName( $name, $format ) );
 636         }
 637
 638         function tableNameInternal( $name ) {
 639                 $name = $this->tableName( $name );
 640
 641                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 642         }
 643
 644         /**
 645          * Return sequence_name if table has a sequence
 646          *
 647          * @param string $table
 648          * @return bool
 649          */
 650         private function getSequenceData( $table ) {
 651                 if ( $this->sequenceData == null ) {
 652                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 653                                 lower(atc.table_name),
 654                                 lower(atc.column_name)
 655                         FROM all_sequences asq, all_tab_columns atc
 656                         WHERE decode(
 657                                         atc.table_name,
 658                                         '{$this->tablePrefix}MWUSER',
 659                                         '{$this->tablePrefix}USER',
 660                                         atc.table_name
 661                                 ) || '_' ||
 662                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 663                                 AND asq.sequence_owner = upper('{$this->getDBname()}')
 664                                 AND atc.owner = upper('{$this->getDBname()}')" );
 665
 666                         while ( ( $row = $result->fetchRow() ) !== false ) {
 667                                 $this->sequenceData[$row[1]] = [
 668                                         'sequence' => $row[0],
 669                                         'column' => $row[2]
 670                                 ];
 671                         }
 672                 }
 673                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 674
 675                 return $this->sequenceData[$table] ?? false;
 676         }
 677
 678         /**
 679          * Returns the size of a text field, or -1 for "unlimited"
 680          *
 681          * @param string $table
 682          * @param string $field
 683          * @return mixed
 684          */
 685         function textFieldSize( $table, $field ) {
 686                 $fieldInfoData = $this->fieldInfo( $table, $field );
 687
 688                 return $fieldInfoData->maxLength();
 689         }
 690
 691         function limitResult( $sql, $limit, $offset = false ) {
 692                 if ( $offset === false ) {
 693                         $offset = 0;
 694                 }
 695
 696                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 697         }
 698
 699         function encodeBlob( $b ) {
 700                 return new Blob( $b );
 701         }
 702
 703         function decodeBlob( $b ) {
 704                 if ( $b instanceof Blob ) {
 705                         $b = $b->fetch();
 706                 }
 707
 708                 return $b;
 709         }
 710
 711         function unionQueries( $sqls, $all ) {
 712                 $glue = ' UNION ALL ';
 713
 714                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 715                         'FROM (' . implode( $glue, $sqls ) . ')';
 716         }
 717
 718         function wasDeadlock() {
 719                 return $this->lastErrno() == 'OCI-00060';
 720         }
 721
 722         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 723                 $fname = __METHOD__
 724         ) {
 725                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 726
 727                 $newName = strtoupper( $newName );
 728                 $oldName = strtoupper( $oldName );
 729
 730                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 731                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 732                 $newPrefix = strtoupper( $this->tablePrefix );
 733
 734                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 735                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 736         }
 737
 738         function listTables( $prefix = null, $fname = __METHOD__ ) {
 739                 $listWhere = '';
 740                 if ( !empty( $prefix ) ) {
 741                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 742                 }
 743
 744                 $owner = strtoupper( $this->getDBname() );
 745                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 746                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 747
 748                 // dirty code ... i know
 749                 $endArray = [];
 750                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 751                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 752                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 753                 $fixedOrderTabs = $endArray;
 754                 while ( ( $row = $result->fetchRow() ) !== false ) {
 755                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 756                                 $endArray[] = $row['table_name'];
 757                         }
 758                 }
 759
 760                 return $endArray;
 761         }
 762
 763         public function dropTable( $tableName, $fName = __METHOD__ ) {
 764                 $tableName = $this->tableName( $tableName );
 765                 if ( !$this->tableExists( $tableName ) ) {
 766                         return false;
 767                 }
 768
 769                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 770         }
 771
 772         function timestamp( $ts = 0 ) {
 773                 return wfTimestamp( TS_ORACLE, $ts );
 774         }
 775
 776         /**
 777          * Return aggregated value function call
 778          *
 779          * @param array $valuedata
 780          * @param string $valuename
 781          * @return mixed
 782          */
 783         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 784                 return $valuedata;
 785         }
 786
 787         /**
 788          * @return string Wikitext of a link to the server software's web site
 789          */
 790         public function getSoftwareLink() {
 791                 return '[{{int:version-db-oracle-url}} Oracle]';
 792         }
 793
 794         /**
 795          * @return string Version information from the database
 796          */
 797         function getServerVersion() {
 798                 // better version number, fallback on driver
 799                 $rset = $this->doQuery(
 800                         'SELECT version FROM product_component_version ' .
 801                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 802                 );
 803                 $row = $rset->fetchRow();
 804                 if ( !$row ) {
 805                         return oci_server_version( $this->conn );
 806                 }
 807
 808                 return $row['version'];
 809         }
 810
 811         /**
 812          * Query whether a given index exists
 813          * @param string $table
 814          * @param string $index
 815          * @param string $fname
 816          * @return bool
 817          */
 818         function indexExists( $table, $index, $fname = __METHOD__ ) {
 819                 $table = $this->tableName( $table );
 820                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 821                 $index = strtoupper( $index );
 822                 $owner = strtoupper( $this->getDBname() );
 823                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 824                 $res = $this->doQuery( $sql );
 825                 if ( $res ) {
 826                         $count = $res->numRows();
 827                         $res->free();
 828                 } else {
 829                         $count = 0;
 830                 }
 831
 832                 return $count != 0;
 833         }
 834
 835         /**
 836          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 837          * @param string $table
 838          * @param string $fname
 839          * @return bool
 840          */
 841         function tableExists( $table, $fname = __METHOD__ ) {
 842                 $table = $this->tableName( $table );
 843                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 844                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 845                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 846                 $res = $this->doQuery( $sql );
 847                 if ( $res && $res->numRows() > 0 ) {
 848                         $exists = true;
 849                 } else {
 850                         $exists = false;
 851                 }
 852
 853                 $res->free();
 854
 855                 return $exists;
 856         }
 857
 858         /**
 859          * Function translates mysql_fetch_field() functionality on ORACLE.
 860          * Caching is present for reducing query time.
 861          * For internal calls. Use fieldInfo for normal usage.
 862          * Returns false if the field doesn't exist
 863          *
 864          * @param array|string $table
 865          * @param string $field
 866          * @return ORAField|ORAResult|false
 867          */
 868         private function fieldInfoMulti( $table, $field ) {
 869                 $field = strtoupper( $field );
 870                 if ( is_array( $table ) ) {
 871                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 872                         $tableWhere = 'IN (';
 873                         foreach ( $table as &$singleTable ) {
 874                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 875                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 876                                         return $this->mFieldInfoCache["$singleTable.$field"];
 877                                 }
 878                                 $tableWhere .= '\'' . $singleTable . '\',';
 879                         }
 880                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 881                 } else {
 882                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 883                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 884                                 return $this->mFieldInfoCache["$table.$field"];
 885                         }
 886                         $tableWhere = '= \'' . $table . '\'';
 887                 }
 888
 889                 $fieldInfoStmt = oci_parse(
 890                         $this->conn,
 891                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 892                                 $tableWhere . ' and column_name = \'' . $field . '\''
 893                 );
 894                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 895                         $e = oci_error( $fieldInfoStmt );
 896                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 897
 898                         return false;
 899                 }
 900                 $res = new ORAResult( $this, $fieldInfoStmt );
 901                 if ( $res->numRows() == 0 ) {
 902                         if ( is_array( $table ) ) {
 903                                 foreach ( $table as &$singleTable ) {
 904                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 905                                 }
 906                         } else {
 907                                 $this->mFieldInfoCache["$table.$field"] = false;
 908                         }
 909                         $fieldInfoTemp = null;
 910                 } else {
 911                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 912                         $table = $fieldInfoTemp->tableName();
 913                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 914                 }
 915                 $res->free();
 916
 917                 return $fieldInfoTemp;
 918         }
 919
 920         /**
 921          * @throws DBUnexpectedError
 922          * @param string $table
 923          * @param string $field
 924          * @return ORAField
 925          */
 926         function fieldInfo( $table, $field ) {
 927                 if ( is_array( $table ) ) {
 928                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 929                 }
 930
 931                 return $this->fieldInfoMulti( $table, $field );
 932         }
 933
 934         protected function doBegin( $fname = __METHOD__ ) {
 935                 $this->trxLevel = 1;
 936                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 937         }
 938
 939         protected function doCommit( $fname = __METHOD__ ) {
 940                 if ( $this->trxLevel ) {
 941                         $ret = oci_commit( $this->conn );
 942                         if ( !$ret ) {
 943                                 throw new DBUnexpectedError( $this, $this->lastError() );
 944                         }
 945                         $this->trxLevel = 0;
 946                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 947                 }
 948         }
 949
 950         protected function doRollback( $fname = __METHOD__ ) {
 951                 if ( $this->trxLevel ) {
 952                         oci_rollback( $this->conn );
 953                         $this->trxLevel = 0;
 954                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 955                 }
 956         }
 957
 958         function sourceStream(
 959                 $fp,
 960                 callable $lineCallback = null,
 961                 callable $resultCallback = null,
 962                 $fname = __METHOD__, callable $inputCallback = null
 963         ) {
 964                 $cmd = '';
 965                 $done = false;
 966                 $dollarquote = false;
 967
 968                 $replacements = [];
 969                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 970                 while ( !feof( $fp ) ) {
 971                         if ( $lineCallback ) {
 972                                 call_user_func( $lineCallback );
 973                         }
 974                         $line = trim( fgets( $fp, 1024 ) );
 975                         $sl = strlen( $line ) - 1;
 976
 977                         if ( $sl < 0 ) {
 978                                 continue;
 979                         }
 980                         if ( $line[0] == '-' && $line[1] == '-' ) {
 981                                 continue;
 982                         }
 983
 984                         // Allow dollar quoting for function declarations
 985                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 986                                 if ( $dollarquote ) {
 987                                         $dollarquote = false;
 988                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 989                                         $done = true;
 990                                 } else {
 991                                         $dollarquote = true;
 992                                 }
 993                         } elseif ( !$dollarquote ) {
 994                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 995                                         $done = true;
 996                                         $line = substr( $line, 0, $sl );
 997                                 }
 998                         }
 999
1000                         if ( $cmd != '' ) {
1001                                 $cmd .= ' ';
1002                         }
1003                         $cmd .= "$line\n";
1004
1005                         if ( $done ) {
1006                                 $cmd = str_replace( ';;', ";", $cmd );
1007                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1008                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1009                                                 $replacements[$defines[2]] = $defines[1];
1010                                         }
1011                                 } else {
1012                                         foreach ( $replacements as $mwVar => $scVar ) {
1013                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1014                                         }
1015
1016                                         $cmd = $this->replaceVars( $cmd );
1017                                         if ( $inputCallback ) {
1018                                                 call_user_func( $inputCallback, $cmd );
1019                                         }
1020                                         $res = $this->doQuery( $cmd );
1021                                         if ( $resultCallback ) {
1022                                                 call_user_func( $resultCallback, $res, $this );
1023                                         }
1024
1025                                         if ( $res === false ) {
1026                                                 $err = $this->lastError();
1027
1028                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1029                                         }
1030                                 }
1031
1032                                 $cmd = '';
1033                                 $done = false;
1034                         }
1035                 }
1036
1037                 return true;
1038         }
1039
1040         protected function doSelectDomain( DatabaseDomain $domain ) {
1041                 if ( $domain->getSchema() !== null ) {
1042                         // We use the *database* aspect of $domain for schema, not the domain schema
1043                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1044                 }
1045
1046                 $database = $domain->getDatabase();
1047                 if ( $database === null || $database === $this->user ) {
1048                         // Backward compatibility
1049                         $this->currentDomain = $domain;
1050
1051                         return true;
1052                 }
1053
1054                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1055                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1056                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1057                 $stmt = oci_parse( $this->conn, $sql );
1058                 Wikimedia\suppressWarnings();
1059                 $success = oci_execute( $stmt );
1060                 Wikimedia\restoreWarnings();
1061                 if ( $success ) {
1062                         // Update that domain fields on success (no exception thrown)
1063                         $this->currentDomain = $domain;
1064                 } else {
1065                         $e = oci_error( $stmt );
1066                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1067                 }
1068
1069                 return true;
1070         }
1071
1072         function strencode( $s ) {
1073                 return str_replace( "'", "''", $s );
1074         }
1075
1076         function addQuotes( $s ) {
1077                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
1078                 if ( isset( $contLang->mLoaded ) && $contLang->mLoaded ) {
1079                         $s = $contLang->checkTitleEncoding( $s );
1080                 }
1081
1082                 return "'" . $this->strencode( $s ) . "'";
1083         }
1084
1085         public function addIdentifierQuotes( $s ) {
1086                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1087                         $s = '/*Q*/' . $s;
1088                 }
1089
1090                 return $s;
1091         }
1092
1093         public function removeIdentifierQuotes( $s ) {
1094                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1095         }
1096
1097         public function isQuotedIdentifier( $s ) {
1098                 return strpos( $s, '/*Q*/' ) !== false;
1099         }
1100
1101         private function wrapFieldForWhere( $table, &$col, &$val ) {
1102                 $col_info = $this->fieldInfoMulti( $table, $col );
1103                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1104                 if ( $col_type == 'CLOB' ) {
1105                         $col = 'TO_CHAR(' . $col . ')';
1106                         $val =
1107                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1108                 } elseif ( $col_type == 'VARCHAR2' ) {
1109                         $val =
1110                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1111                 }
1112         }
1113
1114         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1115                 $conds2 = [];
1116                 foreach ( $conds as $col => $val ) {
1117                         if ( is_array( $val ) ) {
1118                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1119                         } else {
1120                                 if ( is_numeric( $col ) && $parentCol != null ) {
1121                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1122                                 } else {
1123                                         $this->wrapFieldForWhere( $table, $col, $val );
1124                                 }
1125                                 $conds2[$col] = $val;
1126                         }
1127                 }
1128
1129                 return $conds2;
1130         }
1131
1132         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1133                 $options = [], $join_conds = []
1134         ) {
1135                 if ( is_array( $conds ) ) {
1136                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1137                 }
1138
1139                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1140         }
1141
1142         /**
1143          * Returns an optional USE INDEX clause to go after the table, and a
1144          * string to go at the end of the query
1145          *
1146          * @param array $options An associative array of options to be turned into
1147          *   an SQL query, valid keys are listed in the function.
1148          * @return array
1149          */
1150         function makeSelectOptions( $options ) {
1151                 $preLimitTail = $postLimitTail = '';
1152                 $startOpts = '';
1153
1154                 $noKeyOptions = [];
1155                 foreach ( $options as $key => $option ) {
1156                         if ( is_numeric( $key ) ) {
1157                                 $noKeyOptions[$option] = true;
1158                         }
1159                 }
1160
1161                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1162
1163                 $preLimitTail .= $this->makeOrderBy( $options );
1164
1165                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1166                         $postLimitTail .= ' FOR UPDATE';
1167                 }
1168
1169                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1170                         $startOpts .= 'DISTINCT';
1171                 }
1172
1173                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1174                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1175                 } else {
1176                         $useIndex = '';
1177                 }
1178
1179                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1180                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1181                 } else {
1182                         $ignoreIndex = '';
1183                 }
1184
1185                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1186         }
1187
1188         public function delete( $table, $conds, $fname = __METHOD__ ) {
1189                 global $wgActorTableSchemaMigrationStage;
1190
1191                 if ( is_array( $conds ) ) {
1192                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1193                 }
1194                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1195                 // all deletions on these tables have transactions so final failure rollbacks these updates
1196                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1197                 $table = $this->tableName( $table );
1198                 if ( $table == $this->tableName( 'user' ) &&
1199                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1200                 ) {
1201                         $this->update( 'archive', [ 'ar_user' => 0 ],
1202                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1203                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1204                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1205                         $this->update( 'image', [ 'img_user' => 0 ],
1206                                 [ 'img_user' => $conds['user_id'] ], $fname );
1207                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1208                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1209                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1210                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1211                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1212                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1213                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1214                                 [ 'us_user' => $conds['user_id'] ], $fname );
1215                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1216                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1217                         $this->update( 'logging', [ 'log_user' => 0 ],
1218                                 [ 'log_user' => $conds['user_id'] ], $fname );
1219                 } elseif ( $table == $this->tableName( 'image' ) ) {
1220                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1221                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1222                 }
1223
1224                 return parent::delete( $table, $conds, $fname );
1225         }
1226
1227         /**
1228          * @param string $table
1229          * @param array $values
1230          * @param array $conds
1231          * @param string $fname
1232          * @param array $options
1233          * @return bool
1234          * @throws DBUnexpectedError
1235          */
1236         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1237                 $table = $this->tableName( $table );
1238                 $opts = $this->makeUpdateOptions( $options );
1239                 $sql = "UPDATE $opts $table SET ";
1240
1241                 $first = true;
1242                 foreach ( $values as $col => &$val ) {
1243                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1244
1245                         if ( !$first ) {
1246                                 $sqlSet = ', ' . $sqlSet;
1247                         } else {
1248                                 $first = false;
1249                         }
1250                         $sql .= $sqlSet;
1251                 }
1252
1253                 if ( $conds !== [] && $conds !== '*' ) {
1254                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1255                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1256                 }
1257
1258                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1259                 if ( $stmt === false ) {
1260                         $e = oci_error( $this->conn );
1261                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1262
1263                         return false;
1264                 }
1265                 foreach ( $values as $col => &$val ) {
1266                         $col_info = $this->fieldInfoMulti( $table, $col );
1267                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1268
1269                         if ( $val === null ) {
1270                                 // do nothing ... null was inserted in statement creation
1271                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1272                                 if ( is_object( $val ) ) {
1273                                         $val = $val->getData();
1274                                 }
1275
1276                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1277                                         $val = '31-12-2030 12:00:00.000000';
1278                                 }
1279
1280                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
1281                                         checkTitleEncoding( $val );
1282                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1283                                         $e = oci_error( $stmt );
1284                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1285
1286                                         return false;
1287                                 }
1288                         } else {
1289                                 /** @var OCI_Lob[] $lob */
1290                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1291                                 if ( $lob[$col] === false ) {
1292                                         $e = oci_error( $stmt );
1293                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1294                                 }
1295
1296                                 if ( is_object( $val ) ) {
1297                                         $val = $val->getData();
1298                                 }
1299
1300                                 if ( $col_type == 'BLOB' ) {
1301                                         $lob[$col]->writeTemporary( $val );
1302                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1303                                 } else {
1304                                         $lob[$col]->writeTemporary( $val );
1305                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1306                                 }
1307                         }
1308                 }
1309
1310                 Wikimedia\suppressWarnings();
1311
1312                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1313                         $e = oci_error( $stmt );
1314                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1315                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1316
1317                                 return false;
1318                         } else {
1319                                 $this->mAffectedRows = oci_num_rows( $stmt );
1320                         }
1321                 } else {
1322                         $this->mAffectedRows = oci_num_rows( $stmt );
1323                 }
1324
1325                 Wikimedia\restoreWarnings();
1326
1327                 if ( isset( $lob ) ) {
1328                         foreach ( $lob as $lob_v ) {
1329                                 $lob_v->free();
1330                         }
1331                 }
1332
1333                 if ( !$this->trxLevel ) {
1334                         oci_commit( $this->conn );
1335                 }
1336
1337                 return oci_free_statement( $stmt );
1338         }
1339
1340         function bitNot( $field ) {
1341                 // expecting bit-fields smaller than 4bytes
1342                 return 'BITNOT(' . $field . ')';
1343         }
1344
1345         function bitAnd( $fieldLeft, $fieldRight ) {
1346                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1347         }
1348
1349         function bitOr( $fieldLeft, $fieldRight ) {
1350                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1351         }
1352
1353         function getServer() {
1354                 return $this->server;
1355         }
1356
1357         public function buildGroupConcatField(
1358                 $delim, $table, $field, $conds = '', $join_conds = []
1359         ) {
1360                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1361
1362                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1363         }
1364
1365         public function buildSubstring( $input, $startPosition, $length = null ) {
1366                 $this->assertBuildSubstringParams( $startPosition, $length );
1367                 $params = [ $input, $startPosition ];
1368                 if ( $length !== null ) {
1369                         $params[] = $length;
1370                 }
1371                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1372         }
1373
1374         /**
1375          * @param string $field Field or column to cast
1376          * @return string
1377          * @since 1.28
1378          */
1379         public function buildStringCast( $field ) {
1380                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1381         }
1382
1383         public function getInfinity() {
1384                 return '31-12-2030 12:00:00.000000';
1385         }
1386 }