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                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  57                 parent::__construct( $p );
  58                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  59         }
  60
  61         function __destruct() {
  62                 if ( $this->opened ) {
  63                         Wikimedia\suppressWarnings();
  64                         $this->close();
  65                         Wikimedia\restoreWarnings();
  66                 }
  67         }
  68
  69         function getType() {
  70                 return 'oracle';
  71         }
  72
  73         function implicitGroupby() {
  74                 return false;
  75         }
  76
  77         function implicitOrderby() {
  78                 return false;
  79         }
  80
  81         protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
  82                 global $wgDBOracleDRCP;
  83
  84                 if ( !function_exists( 'oci_connect' ) ) {
  85                         throw new DBConnectionError(
  86                                 $this,
  87                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  88                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  89                                         "and database)\n" );
  90                 }
  91
  92                 $this->close();
  93                 $this->user = $user;
  94                 $this->password = $password;
  95                 if ( !$server ) {
  96                         // Backward compatibility (server used to be null and TNS was supplied in dbname)
  97                         $this->server = $dbName;
  98                         $realDatabase = $user;
  99                 } else {
 100                         // $server now holds the TNS endpoint
 101                         $this->server = $server;
 102                         // $dbName is schema name if different from username
 103                         $realDatabase = $dbName ?: $user;
 104                 }
 105
 106                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 107                         return null;
 108                 }
 109
 110                 if ( $wgDBOracleDRCP ) {
 111                         $this->setFlag( DBO_PERSISTENT );
 112                 }
 113
 114                 $session_mode = ( $this->flags & DBO_SYSDBA ) ? OCI_SYSDBA : OCI_DEFAULT;
 115
 116                 Wikimedia\suppressWarnings();
 117                 if ( $this->flags & DBO_PERSISTENT ) {
 118                         $this->conn = oci_pconnect(
 119                                 $this->user,
 120                                 $this->password,
 121                                 $this->server,
 122                                 $this->defaultCharset,
 123                                 $session_mode
 124                         );
 125                 } elseif ( $this->flags & DBO_DEFAULT ) {
 126                         $this->conn = oci_new_connect(
 127                                 $this->user,
 128                                 $this->password,
 129                                 $this->server,
 130                                 $this->defaultCharset,
 131                                 $session_mode
 132                         );
 133                 } else {
 134                         $this->conn = oci_connect(
 135                                 $this->user,
 136                                 $this->password,
 137                                 $this->server,
 138                                 $this->defaultCharset,
 139                                 $session_mode
 140                         );
 141                 }
 142                 Wikimedia\restoreWarnings();
 143
 144                 if ( $this->user != $realDatabase ) {
 145                         // change current schema in session
 146                         $this->selectDB( $realDatabase );
 147                 } else {
 148                         $this->currentDomain = new DatabaseDomain(
 149                                 $realDatabase,
 150                                 null,
 151                                 $tablePrefix
 152                         );
 153                 }
 154
 155                 if ( !$this->conn ) {
 156                         throw new DBConnectionError( $this, $this->lastError() );
 157                 }
 158
 159                 $this->opened = true;
 160
 161                 # removed putenv calls because they interfere with the system globaly
 162                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 163                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 164                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 165
 166                 return (bool)$this->conn;
 167         }
 168
 169         /**
 170          * Closes a database connection, if it is open
 171          * Returns success, true if already closed
 172          * @return bool
 173          */
 174         protected function closeConnection() {
 175                 return oci_close( $this->conn );
 176         }
 177
 178         function execFlags() {
 179                 return $this->trxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 180         }
 181
 182         /**
 183          * @param string $sql
 184          * @return bool|mixed|ORAResult
 185          */
 186         protected function doQuery( $sql ) {
 187                 wfDebug( "SQL: [$sql]\n" );
 188                 if ( !StringUtils::isUtf8( $sql ) ) {
 189                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 190                 }
 191
 192                 // handle some oracle specifics
 193                 // remove AS column/table/subquery namings
 194                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 195                         $sql = preg_replace( '/ as /i', ' ', $sql );
 196                 }
 197
 198                 // Oracle has issues with UNION clause if the statement includes LOB fields
 199                 // So we do a UNION ALL and then filter the results array with array_unique
 200                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 201                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 202                 // you have to select data from plan table after explain
 203                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 204
 205                 $sql = preg_replace(
 206                         '/^EXPLAIN /',
 207                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 208                         $sql,
 209                         1,
 210                         $explain_count
 211                 );
 212
 213                 Wikimedia\suppressWarnings();
 214
 215                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 216                 if ( $stmt === false ) {
 217                         $e = oci_error( $this->conn );
 218                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 219
 220                         return false;
 221                 }
 222
 223                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 224                         $e = oci_error( $stmt );
 225                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 226                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 227
 228                                 return false;
 229                         }
 230                 }
 231
 232                 Wikimedia\restoreWarnings();
 233
 234                 if ( $explain_count > 0 ) {
 235                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 236                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 237                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 238                         return new ORAResult( $this, $stmt, $union_unique );
 239                 } else {
 240                         $this->mAffectedRows = oci_num_rows( $stmt );
 241
 242                         return true;
 243                 }
 244         }
 245
 246         function queryIgnore( $sql, $fname = '' ) {
 247                 return $this->query( $sql, $fname, true );
 248         }
 249
 250         /**
 251          * Frees resources associated with the LOB descriptor
 252          * @param ResultWrapper|ORAResult $res
 253          */
 254         function freeResult( $res ) {
 255                 if ( $res instanceof ResultWrapper ) {
 256                         $res = $res->result;
 257                 }
 258
 259                 $res->free();
 260         }
 261
 262         /**
 263          * @param ResultWrapper|ORAResult $res
 264          * @return mixed
 265          */
 266         function fetchObject( $res ) {
 267                 if ( $res instanceof ResultWrapper ) {
 268                         $res = $res->result;
 269                 }
 270
 271                 return $res->fetchObject();
 272         }
 273
 274         /**
 275          * @param ResultWrapper|ORAResult $res
 276          * @return mixed
 277          */
 278         function fetchRow( $res ) {
 279                 if ( $res instanceof ResultWrapper ) {
 280                         $res = $res->result;
 281                 }
 282
 283                 return $res->fetchRow();
 284         }
 285
 286         /**
 287          * @param ResultWrapper|ORAResult $res
 288          * @return int
 289          */
 290         function numRows( $res ) {
 291                 if ( $res instanceof ResultWrapper ) {
 292                         $res = $res->result;
 293                 }
 294
 295                 return $res->numRows();
 296         }
 297
 298         /**
 299          * @param ResultWrapper|ORAResult $res
 300          * @return int
 301          */
 302         function numFields( $res ) {
 303                 if ( $res instanceof ResultWrapper ) {
 304                         $res = $res->result;
 305                 }
 306
 307                 return $res->numFields();
 308         }
 309
 310         function fieldName( $stmt, $n ) {
 311                 return oci_field_name( $stmt, $n );
 312         }
 313
 314         function insertId() {
 315                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 316                 $row = $this->fetchRow( $res );
 317                 return is_null( $row[0] ) ? null : (int)$row[0];
 318         }
 319
 320         /**
 321          * @param mixed $res
 322          * @param int $row
 323          */
 324         function dataSeek( $res, $row ) {
 325                 if ( $res instanceof ORAResult ) {
 326                         $res->seek( $row );
 327                 } else {
 328                         $res->result->seek( $row );
 329                 }
 330         }
 331
 332         function lastError() {
 333                 if ( $this->conn === false ) {
 334                         $e = oci_error();
 335                 } else {
 336                         $e = oci_error( $this->conn );
 337                 }
 338
 339                 return $e['message'];
 340         }
 341
 342         function lastErrno() {
 343                 if ( $this->conn === false ) {
 344                         $e = oci_error();
 345                 } else {
 346                         $e = oci_error( $this->conn );
 347                 }
 348
 349                 return $e['code'];
 350         }
 351
 352         protected function fetchAffectedRowCount() {
 353                 return $this->mAffectedRows;
 354         }
 355
 356         /**
 357          * Returns information about an index
 358          * If errors are explicitly ignored, returns NULL on failure
 359          * @param string $table
 360          * @param string $index
 361          * @param string $fname
 362          * @return bool
 363          */
 364         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 365                 return false;
 366         }
 367
 368         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 369                 return false;
 370         }
 371
 372         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 373                 if ( !count( $a ) ) {
 374                         return true;
 375                 }
 376
 377                 if ( !is_array( $options ) ) {
 378                         $options = [ $options ];
 379                 }
 380
 381                 if ( in_array( 'IGNORE', $options ) ) {
 382                         $this->ignoreDupValOnIndex = true;
 383                 }
 384
 385                 if ( !is_array( reset( $a ) ) ) {
 386                         $a = [ $a ];
 387                 }
 388
 389                 foreach ( $a as &$row ) {
 390                         $this->insertOneRow( $table, $row, $fname );
 391                 }
 392
 393                 if ( in_array( 'IGNORE', $options ) ) {
 394                         $this->ignoreDupValOnIndex = false;
 395                 }
 396
 397                 return true;
 398         }
 399
 400         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 401                 $col_info = $this->fieldInfoMulti( $table, $col );
 402                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 403
 404                 $bind = '';
 405                 if ( is_numeric( $col ) ) {
 406                         $bind = $val;
 407                         $val = null;
 408
 409                         return $bind;
 410                 } elseif ( $includeCol ) {
 411                         $bind = "$col = ";
 412                 }
 413
 414                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 415                         $val = null;
 416                 }
 417
 418                 if ( $val === 'NULL' ) {
 419                         $val = null;
 420                 }
 421
 422                 if ( $val === null ) {
 423                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 424                                 $bind .= 'DEFAULT';
 425                         } else {
 426                                 $bind .= 'NULL';
 427                         }
 428                 } else {
 429                         $bind .= ':' . $col;
 430                 }
 431
 432                 return $bind;
 433         }
 434
 435         /**
 436          * @param string $table
 437          * @param array $row
 438          * @param string $fname
 439          * @return bool
 440          * @throws DBUnexpectedError
 441          */
 442         private function insertOneRow( $table, $row, $fname ) {
 443                 $table = $this->tableName( $table );
 444                 // "INSERT INTO tables (a, b, c)"
 445                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 446                 $sql .= " VALUES (";
 447
 448                 // for each value, append ":key"
 449                 $first = true;
 450                 foreach ( $row as $col => &$val ) {
 451                         if ( !$first ) {
 452                                 $sql .= ', ';
 453                         } else {
 454                                 $first = false;
 455                         }
 456                         if ( $this->isQuotedIdentifier( $val ) ) {
 457                                 $sql .= $this->removeIdentifierQuotes( $val );
 458                                 unset( $row[$col] );
 459                         } else {
 460                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 461                         }
 462                 }
 463                 $sql .= ')';
 464
 465                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 466                 if ( $stmt === false ) {
 467                         $e = oci_error( $this->conn );
 468                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 469
 470                         return false;
 471                 }
 472                 foreach ( $row as $col => &$val ) {
 473                         $col_info = $this->fieldInfoMulti( $table, $col );
 474                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 475
 476                         if ( $val === null ) {
 477                                 // do nothing ... null was inserted in statement creation
 478                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 479                                 if ( is_object( $val ) ) {
 480                                         $val = $val->fetch();
 481                                 }
 482
 483                                 // backward compatibility
 484                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 485                                         $val = $this->getInfinity();
 486                                 }
 487
 488                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
 489                                         checkTitleEncoding( $val );
 490                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 491                                         $e = oci_error( $stmt );
 492                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 493
 494                                         return false;
 495                                 }
 496                         } else {
 497                                 /** @var OCI_Lob[] $lob */
 498                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 499                                 if ( $lob[$col] === false ) {
 500                                         $e = oci_error( $stmt );
 501                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 502                                 }
 503
 504                                 if ( is_object( $val ) ) {
 505                                         $val = $val->fetch();
 506                                 }
 507
 508                                 if ( $col_type == 'BLOB' ) {
 509                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 510                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 511                                 } else {
 512                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 513                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 514                                 }
 515                         }
 516                 }
 517
 518                 Wikimedia\suppressWarnings();
 519
 520                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 521                         $e = oci_error( $stmt );
 522                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 523                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 524
 525                                 return false;
 526                         } else {
 527                                 $this->mAffectedRows = oci_num_rows( $stmt );
 528                         }
 529                 } else {
 530                         $this->mAffectedRows = oci_num_rows( $stmt );
 531                 }
 532
 533                 Wikimedia\restoreWarnings();
 534
 535                 if ( isset( $lob ) ) {
 536                         foreach ( $lob as $lob_v ) {
 537                                 $lob_v->free();
 538                         }
 539                 }
 540
 541                 if ( !$this->trxLevel ) {
 542                         oci_commit( $this->conn );
 543                 }
 544
 545                 return oci_free_statement( $stmt );
 546         }
 547
 548         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 549                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 550         ) {
 551                 $destTable = $this->tableName( $destTable );
 552
 553                 $sequenceData = $this->getSequenceData( $destTable );
 554                 if ( $sequenceData !== false &&
 555                         !isset( $varMap[$sequenceData['column']] )
 556                 ) {
 557                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 558                 }
 559
 560                 // count-alias subselect fields to avoid abigious definition errors
 561                 $i = 0;
 562                 foreach ( $varMap as &$val ) {
 563                         $val .= ' field' . $i;
 564                         $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, $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 unionQueries( $sqls, $all ) {
 699                 $glue = ' UNION ALL ';
 700
 701                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 702                         'FROM (' . implode( $glue, $sqls ) . ')';
 703         }
 704
 705         function wasDeadlock() {
 706                 return $this->lastErrno() == 'OCI-00060';
 707         }
 708
 709         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 710                 $fname = __METHOD__
 711         ) {
 712                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 713
 714                 $newName = strtoupper( $newName );
 715                 $oldName = strtoupper( $oldName );
 716
 717                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 718                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 719                 $newPrefix = strtoupper( $this->tablePrefix );
 720
 721                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 722                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 723         }
 724
 725         function listTables( $prefix = null, $fname = __METHOD__ ) {
 726                 $listWhere = '';
 727                 if ( !empty( $prefix ) ) {
 728                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 729                 }
 730
 731                 $owner = strtoupper( $this->getDBname() );
 732                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 733                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 734
 735                 // dirty code ... i know
 736                 $endArray = [];
 737                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 738                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 739                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 740                 $fixedOrderTabs = $endArray;
 741                 while ( ( $row = $result->fetchRow() ) !== false ) {
 742                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 743                                 $endArray[] = $row['table_name'];
 744                         }
 745                 }
 746
 747                 return $endArray;
 748         }
 749
 750         public function dropTable( $tableName, $fName = __METHOD__ ) {
 751                 $tableName = $this->tableName( $tableName );
 752                 if ( !$this->tableExists( $tableName ) ) {
 753                         return false;
 754                 }
 755
 756                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 757         }
 758
 759         function timestamp( $ts = 0 ) {
 760                 return wfTimestamp( TS_ORACLE, $ts );
 761         }
 762
 763         /**
 764          * Return aggregated value function call
 765          *
 766          * @param array $valuedata
 767          * @param string $valuename
 768          * @return mixed
 769          */
 770         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 771                 return $valuedata;
 772         }
 773
 774         /**
 775          * @return string Wikitext of a link to the server software's web site
 776          */
 777         public function getSoftwareLink() {
 778                 return '[{{int:version-db-oracle-url}} Oracle]';
 779         }
 780
 781         /**
 782          * @return string Version information from the database
 783          */
 784         function getServerVersion() {
 785                 // better version number, fallback on driver
 786                 $rset = $this->doQuery(
 787                         'SELECT version FROM product_component_version ' .
 788                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 789                 );
 790                 $row = $rset->fetchRow();
 791                 if ( !$row ) {
 792                         return oci_server_version( $this->conn );
 793                 }
 794
 795                 return $row['version'];
 796         }
 797
 798         /**
 799          * Query whether a given index exists
 800          * @param string $table
 801          * @param string $index
 802          * @param string $fname
 803          * @return bool
 804          */
 805         function indexExists( $table, $index, $fname = __METHOD__ ) {
 806                 $table = $this->tableName( $table );
 807                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 808                 $index = strtoupper( $index );
 809                 $owner = strtoupper( $this->getDBname() );
 810                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 811                 $res = $this->doQuery( $sql );
 812                 if ( $res ) {
 813                         $count = $res->numRows();
 814                         $res->free();
 815                 } else {
 816                         $count = 0;
 817                 }
 818
 819                 return $count != 0;
 820         }
 821
 822         /**
 823          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 824          * @param string $table
 825          * @param string $fname
 826          * @return bool
 827          */
 828         function tableExists( $table, $fname = __METHOD__ ) {
 829                 $table = $this->tableName( $table );
 830                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 831                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 832                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 833                 $res = $this->doQuery( $sql );
 834                 if ( $res && $res->numRows() > 0 ) {
 835                         $exists = true;
 836                 } else {
 837                         $exists = false;
 838                 }
 839
 840                 $res->free();
 841
 842                 return $exists;
 843         }
 844
 845         /**
 846          * Function translates mysql_fetch_field() functionality on ORACLE.
 847          * Caching is present for reducing query time.
 848          * For internal calls. Use fieldInfo for normal usage.
 849          * Returns false if the field doesn't exist
 850          *
 851          * @param array|string $table
 852          * @param string $field
 853          * @return ORAField|ORAResult|false
 854          */
 855         private function fieldInfoMulti( $table, $field ) {
 856                 $field = strtoupper( $field );
 857                 if ( is_array( $table ) ) {
 858                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 859                         $tableWhere = 'IN (';
 860                         foreach ( $table as &$singleTable ) {
 861                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 862                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 863                                         return $this->mFieldInfoCache["$singleTable.$field"];
 864                                 }
 865                                 $tableWhere .= '\'' . $singleTable . '\',';
 866                         }
 867                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 868                 } else {
 869                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 870                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 871                                 return $this->mFieldInfoCache["$table.$field"];
 872                         }
 873                         $tableWhere = '= \'' . $table . '\'';
 874                 }
 875
 876                 $fieldInfoStmt = oci_parse(
 877                         $this->conn,
 878                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 879                                 $tableWhere . ' and column_name = \'' . $field . '\''
 880                 );
 881                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 882                         $e = oci_error( $fieldInfoStmt );
 883                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 884
 885                         return false;
 886                 }
 887                 $res = new ORAResult( $this, $fieldInfoStmt );
 888                 if ( $res->numRows() == 0 ) {
 889                         if ( is_array( $table ) ) {
 890                                 foreach ( $table as &$singleTable ) {
 891                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 892                                 }
 893                         } else {
 894                                 $this->mFieldInfoCache["$table.$field"] = false;
 895                         }
 896                         $fieldInfoTemp = null;
 897                 } else {
 898                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 899                         $table = $fieldInfoTemp->tableName();
 900                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 901                 }
 902                 $res->free();
 903
 904                 return $fieldInfoTemp;
 905         }
 906
 907         /**
 908          * @throws DBUnexpectedError
 909          * @param string $table
 910          * @param string $field
 911          * @return ORAField
 912          */
 913         function fieldInfo( $table, $field ) {
 914                 if ( is_array( $table ) ) {
 915                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 916                 }
 917
 918                 return $this->fieldInfoMulti( $table, $field );
 919         }
 920
 921         protected function doBegin( $fname = __METHOD__ ) {
 922                 $this->trxLevel = 1;
 923                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 924         }
 925
 926         protected function doCommit( $fname = __METHOD__ ) {
 927                 if ( $this->trxLevel ) {
 928                         $ret = oci_commit( $this->conn );
 929                         if ( !$ret ) {
 930                                 throw new DBUnexpectedError( $this, $this->lastError() );
 931                         }
 932                         $this->trxLevel = 0;
 933                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 934                 }
 935         }
 936
 937         protected function doRollback( $fname = __METHOD__ ) {
 938                 if ( $this->trxLevel ) {
 939                         oci_rollback( $this->conn );
 940                         $this->trxLevel = 0;
 941                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 942                 }
 943         }
 944
 945         function sourceStream(
 946                 $fp,
 947                 callable $lineCallback = null,
 948                 callable $resultCallback = null,
 949                 $fname = __METHOD__, callable $inputCallback = null
 950         ) {
 951                 $cmd = '';
 952                 $done = false;
 953                 $dollarquote = false;
 954
 955                 $replacements = [];
 956                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 957                 while ( !feof( $fp ) ) {
 958                         if ( $lineCallback ) {
 959                                 $lineCallback();
 960                         }
 961                         $line = trim( fgets( $fp, 1024 ) );
 962                         $sl = strlen( $line ) - 1;
 963
 964                         if ( $sl < 0 ) {
 965                                 continue;
 966                         }
 967                         if ( $line[0] == '-' && $line[1] == '-' ) {
 968                                 continue;
 969                         }
 970
 971                         // Allow dollar quoting for function declarations
 972                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 973                                 if ( $dollarquote ) {
 974                                         $dollarquote = false;
 975                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 976                                         $done = true;
 977                                 } else {
 978                                         $dollarquote = true;
 979                                 }
 980                         } elseif ( !$dollarquote ) {
 981                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 982                                         $done = true;
 983                                         $line = substr( $line, 0, $sl );
 984                                 }
 985                         }
 986
 987                         if ( $cmd != '' ) {
 988                                 $cmd .= ' ';
 989                         }
 990                         $cmd .= "$line\n";
 991
 992                         if ( $done ) {
 993                                 $cmd = str_replace( ';;', ";", $cmd );
 994                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
 995                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
 996                                                 $replacements[$defines[2]] = $defines[1];
 997                                         }
 998                                 } else {
 999                                         foreach ( $replacements as $mwVar => $scVar ) {
1000                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1001                                         }
1002
1003                                         $cmd = $this->replaceVars( $cmd );
1004                                         if ( $inputCallback ) {
1005                                                 $inputCallback( $cmd );
1006                                         }
1007                                         $res = $this->doQuery( $cmd );
1008                                         if ( $resultCallback ) {
1009                                                 call_user_func( $resultCallback, $res, $this );
1010                                         }
1011
1012                                         if ( $res === false ) {
1013                                                 $err = $this->lastError();
1014
1015                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1016                                         }
1017                                 }
1018
1019                                 $cmd = '';
1020                                 $done = false;
1021                         }
1022                 }
1023
1024                 return true;
1025         }
1026
1027         protected function doSelectDomain( DatabaseDomain $domain ) {
1028                 if ( $domain->getSchema() !== null ) {
1029                         // We use the *database* aspect of $domain for schema, not the domain schema
1030                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1031                 }
1032
1033                 $database = $domain->getDatabase();
1034                 if ( $database === null || $database === $this->user ) {
1035                         // Backward compatibility
1036                         $this->currentDomain = $domain;
1037
1038                         return true;
1039                 }
1040
1041                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1042                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1043                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1044                 $stmt = oci_parse( $this->conn, $sql );
1045                 Wikimedia\suppressWarnings();
1046                 $success = oci_execute( $stmt );
1047                 Wikimedia\restoreWarnings();
1048                 if ( $success ) {
1049                         // Update that domain fields on success (no exception thrown)
1050                         $this->currentDomain = $domain;
1051                 } else {
1052                         $e = oci_error( $stmt );
1053                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1054                 }
1055
1056                 return true;
1057         }
1058
1059         function strencode( $s ) {
1060                 return str_replace( "'", "''", $s );
1061         }
1062
1063         function addQuotes( $s ) {
1064                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
1065                 if ( isset( $contLang->mLoaded ) && $contLang->mLoaded ) {
1066                         $s = $contLang->checkTitleEncoding( $s );
1067                 }
1068
1069                 return "'" . $this->strencode( $s ) . "'";
1070         }
1071
1072         public function addIdentifierQuotes( $s ) {
1073                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1074                         $s = '/*Q*/' . $s;
1075                 }
1076
1077                 return $s;
1078         }
1079
1080         public function removeIdentifierQuotes( $s ) {
1081                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1082         }
1083
1084         public function isQuotedIdentifier( $s ) {
1085                 return strpos( $s, '/*Q*/' ) !== false;
1086         }
1087
1088         private function wrapFieldForWhere( $table, &$col, &$val ) {
1089                 $col_info = $this->fieldInfoMulti( $table, $col );
1090                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1091                 if ( $col_type == 'CLOB' ) {
1092                         $col = 'TO_CHAR(' . $col . ')';
1093                         $val =
1094                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1095                 } elseif ( $col_type == 'VARCHAR2' ) {
1096                         $val =
1097                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1098                 }
1099         }
1100
1101         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1102                 $conds2 = [];
1103                 foreach ( $conds as $col => $val ) {
1104                         if ( is_array( $val ) ) {
1105                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1106                         } else {
1107                                 if ( is_numeric( $col ) && $parentCol != null ) {
1108                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1109                                 } else {
1110                                         $this->wrapFieldForWhere( $table, $col, $val );
1111                                 }
1112                                 $conds2[$col] = $val;
1113                         }
1114                 }
1115
1116                 return $conds2;
1117         }
1118
1119         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1120                 $options = [], $join_conds = []
1121         ) {
1122                 if ( is_array( $conds ) ) {
1123                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1124                 }
1125
1126                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1127         }
1128
1129         /**
1130          * Returns an optional USE INDEX clause to go after the table, and a
1131          * string to go at the end of the query
1132          *
1133          * @param array $options An associative array of options to be turned into
1134          *   an SQL query, valid keys are listed in the function.
1135          * @return array
1136          */
1137         function makeSelectOptions( $options ) {
1138                 $preLimitTail = $postLimitTail = '';
1139                 $startOpts = '';
1140
1141                 $noKeyOptions = [];
1142                 foreach ( $options as $key => $option ) {
1143                         if ( is_numeric( $key ) ) {
1144                                 $noKeyOptions[$option] = true;
1145                         }
1146                 }
1147
1148                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1149
1150                 $preLimitTail .= $this->makeOrderBy( $options );
1151
1152                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1153                         $postLimitTail .= ' FOR UPDATE';
1154                 }
1155
1156                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1157                         $startOpts .= 'DISTINCT';
1158                 }
1159
1160                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1161                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1162                 } else {
1163                         $useIndex = '';
1164                 }
1165
1166                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1167                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1168                 } else {
1169                         $ignoreIndex = '';
1170                 }
1171
1172                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1173         }
1174
1175         public function delete( $table, $conds, $fname = __METHOD__ ) {
1176                 global $wgActorTableSchemaMigrationStage;
1177
1178                 if ( is_array( $conds ) ) {
1179                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1180                 }
1181                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1182                 // all deletions on these tables have transactions so final failure rollbacks these updates
1183                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1184                 $table = $this->tableName( $table );
1185                 if ( $table == $this->tableName( 'user' ) &&
1186                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1187                 ) {
1188                         $this->update( 'archive', [ 'ar_user' => 0 ],
1189                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1190                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1191                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1192                         $this->update( 'image', [ 'img_user' => 0 ],
1193                                 [ 'img_user' => $conds['user_id'] ], $fname );
1194                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1195                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1196                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1197                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1198                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1199                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1200                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1201                                 [ 'us_user' => $conds['user_id'] ], $fname );
1202                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1203                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1204                         $this->update( 'logging', [ 'log_user' => 0 ],
1205                                 [ 'log_user' => $conds['user_id'] ], $fname );
1206                 } elseif ( $table == $this->tableName( 'image' ) ) {
1207                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1208                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1209                 }
1210
1211                 return parent::delete( $table, $conds, $fname );
1212         }
1213
1214         /**
1215          * @param string $table
1216          * @param array $values
1217          * @param array $conds
1218          * @param string $fname
1219          * @param array $options
1220          * @return bool
1221          * @throws DBUnexpectedError
1222          */
1223         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1224                 $table = $this->tableName( $table );
1225                 $opts = $this->makeUpdateOptions( $options );
1226                 $sql = "UPDATE $opts $table SET ";
1227
1228                 $first = true;
1229                 foreach ( $values as $col => &$val ) {
1230                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1231
1232                         if ( !$first ) {
1233                                 $sqlSet = ', ' . $sqlSet;
1234                         } else {
1235                                 $first = false;
1236                         }
1237                         $sql .= $sqlSet;
1238                 }
1239
1240                 if ( $conds !== [] && $conds !== '*' ) {
1241                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1242                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1243                 }
1244
1245                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1246                 if ( $stmt === false ) {
1247                         $e = oci_error( $this->conn );
1248                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1249
1250                         return false;
1251                 }
1252                 foreach ( $values as $col => &$val ) {
1253                         $col_info = $this->fieldInfoMulti( $table, $col );
1254                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1255
1256                         if ( $val === null ) {
1257                                 // do nothing ... null was inserted in statement creation
1258                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1259                                 if ( is_object( $val ) ) {
1260                                         $val = $val->getData();
1261                                 }
1262
1263                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1264                                         $val = '31-12-2030 12:00:00.000000';
1265                                 }
1266
1267                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
1268                                         checkTitleEncoding( $val );
1269                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1270                                         $e = oci_error( $stmt );
1271                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1272
1273                                         return false;
1274                                 }
1275                         } else {
1276                                 /** @var OCI_Lob[] $lob */
1277                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1278                                 if ( $lob[$col] === false ) {
1279                                         $e = oci_error( $stmt );
1280                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1281                                 }
1282
1283                                 if ( is_object( $val ) ) {
1284                                         $val = $val->getData();
1285                                 }
1286
1287                                 if ( $col_type == 'BLOB' ) {
1288                                         $lob[$col]->writeTemporary( $val );
1289                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1290                                 } else {
1291                                         $lob[$col]->writeTemporary( $val );
1292                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1293                                 }
1294                         }
1295                 }
1296
1297                 Wikimedia\suppressWarnings();
1298
1299                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1300                         $e = oci_error( $stmt );
1301                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1302                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1303
1304                                 return false;
1305                         } else {
1306                                 $this->mAffectedRows = oci_num_rows( $stmt );
1307                         }
1308                 } else {
1309                         $this->mAffectedRows = oci_num_rows( $stmt );
1310                 }
1311
1312                 Wikimedia\restoreWarnings();
1313
1314                 if ( isset( $lob ) ) {
1315                         foreach ( $lob as $lob_v ) {
1316                                 $lob_v->free();
1317                         }
1318                 }
1319
1320                 if ( !$this->trxLevel ) {
1321                         oci_commit( $this->conn );
1322                 }
1323
1324                 return oci_free_statement( $stmt );
1325         }
1326
1327         function bitNot( $field ) {
1328                 // expecting bit-fields smaller than 4bytes
1329                 return 'BITNOT(' . $field . ')';
1330         }
1331
1332         function bitAnd( $fieldLeft, $fieldRight ) {
1333                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1334         }
1335
1336         function bitOr( $fieldLeft, $fieldRight ) {
1337                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1338         }
1339
1340         public function buildGroupConcatField(
1341                 $delim, $table, $field, $conds = '', $join_conds = []
1342         ) {
1343                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1344
1345                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1346         }
1347
1348         public function buildSubstring( $input, $startPosition, $length = null ) {
1349                 $this->assertBuildSubstringParams( $startPosition, $length );
1350                 $params = [ $input, $startPosition ];
1351                 if ( $length !== null ) {
1352                         $params[] = $length;
1353                 }
1354                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1355         }
1356
1357         /**
1358          * @param string $field Field or column to cast
1359          * @return string
1360          * @since 1.28
1361          */
1362         public function buildStringCast( $field ) {
1363                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1364         }
1365
1366         public function getInfinity() {
1367                 return '31-12-2030 12:00:00.000000';
1368         }
1369 }