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