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 Wikimedia\Timestamp\ConvertibleTimestamp;
  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
  59                 // @TODO: dependency inject
  60                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  61         }
  62
  63         function __destruct() {
  64                 if ( $this->opened ) {
  65                         Wikimedia\suppressWarnings();
  66                         $this->close();
  67                         Wikimedia\restoreWarnings();
  68                 }
  69         }
  70
  71         function getType() {
  72                 return 'oracle';
  73         }
  74
  75         function implicitGroupby() {
  76                 return false;
  77         }
  78
  79         function implicitOrderby() {
  80                 return false;
  81         }
  82
  83         protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
  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                 $session_mode = ( $this->flags & DBO_SYSDBA ) ? OCI_SYSDBA : OCI_DEFAULT;
 111
 112                 Wikimedia\suppressWarnings();
 113                 if ( $this->flags & DBO_PERSISTENT ) {
 114                         $this->conn = oci_pconnect(
 115                                 $this->user,
 116                                 $this->password,
 117                                 $this->server,
 118                                 $this->defaultCharset,
 119                                 $session_mode
 120                         );
 121                 } elseif ( $this->flags & DBO_DEFAULT ) {
 122                         $this->conn = oci_new_connect(
 123                                 $this->user,
 124                                 $this->password,
 125                                 $this->server,
 126                                 $this->defaultCharset,
 127                                 $session_mode
 128                         );
 129                 } else {
 130                         $this->conn = oci_connect(
 131                                 $this->user,
 132                                 $this->password,
 133                                 $this->server,
 134                                 $this->defaultCharset,
 135                                 $session_mode
 136                         );
 137                 }
 138                 Wikimedia\restoreWarnings();
 139
 140                 if ( $this->user != $realDatabase ) {
 141                         // change current schema in session
 142                         $this->selectDB( $realDatabase );
 143                 } else {
 144                         $this->currentDomain = new DatabaseDomain(
 145                                 $realDatabase,
 146                                 null,
 147                                 $tablePrefix
 148                         );
 149                 }
 150
 151                 if ( !$this->conn ) {
 152                         throw new DBConnectionError( $this, $this->lastError() );
 153                 }
 154
 155                 $this->opened = true;
 156
 157                 # removed putenv calls because they interfere with the system globaly
 158                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 159                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 160                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 161
 162                 return (bool)$this->conn;
 163         }
 164
 165         /**
 166          * Closes a database connection, if it is open
 167          * Returns success, true if already closed
 168          * @return bool
 169          */
 170         protected function closeConnection() {
 171                 return oci_close( $this->conn );
 172         }
 173
 174         function execFlags() {
 175                 return $this->trxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 176         }
 177
 178         /**
 179          * @param string $sql
 180          * @return bool|mixed|ORAResult
 181          */
 182         protected function doQuery( $sql ) {
 183                 wfDebug( "SQL: [$sql]\n" );
 184                 if ( !mb_check_encoding( (string)$sql, 'UTF-8' ) ) {
 185                         throw new DBUnexpectedError( $this, "SQL encoding is invalid\n$sql" );
 186                 }
 187
 188                 // handle some oracle specifics
 189                 // remove AS column/table/subquery namings
 190                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 191                         $sql = preg_replace( '/ as /i', ' ', $sql );
 192                 }
 193
 194                 // Oracle has issues with UNION clause if the statement includes LOB fields
 195                 // So we do a UNION ALL and then filter the results array with array_unique
 196                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 197                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 198                 // you have to select data from plan table after explain
 199                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 200
 201                 $sql = preg_replace(
 202                         '/^EXPLAIN /',
 203                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 204                         $sql,
 205                         1,
 206                         $explain_count
 207                 );
 208
 209                 Wikimedia\suppressWarnings();
 210
 211                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 212                 if ( $stmt === false ) {
 213                         $e = oci_error( $this->conn );
 214                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 215
 216                         return false;
 217                 }
 218
 219                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 220                         $e = oci_error( $stmt );
 221                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 222                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 223
 224                                 return false;
 225                         }
 226                 }
 227
 228                 Wikimedia\restoreWarnings();
 229
 230                 if ( $explain_count > 0 ) {
 231                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 232                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 233                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 234                         return new ORAResult( $this, $stmt, $union_unique );
 235                 } else {
 236                         $this->mAffectedRows = oci_num_rows( $stmt );
 237
 238                         return true;
 239                 }
 240         }
 241
 242         function queryIgnore( $sql, $fname = '' ) {
 243                 return $this->query( $sql, $fname, true );
 244         }
 245
 246         /**
 247          * Frees resources associated with the LOB descriptor
 248          * @param ResultWrapper|ORAResult $res
 249          */
 250         function freeResult( $res ) {
 251                 if ( $res instanceof ResultWrapper ) {
 252                         $res = $res->result;
 253                 }
 254
 255                 $res->free();
 256         }
 257
 258         /**
 259          * @param ResultWrapper|ORAResult $res
 260          * @return mixed
 261          */
 262         function fetchObject( $res ) {
 263                 if ( $res instanceof ResultWrapper ) {
 264                         $res = $res->result;
 265                 }
 266
 267                 return $res->fetchObject();
 268         }
 269
 270         /**
 271          * @param ResultWrapper|ORAResult $res
 272          * @return mixed
 273          */
 274         function fetchRow( $res ) {
 275                 if ( $res instanceof ResultWrapper ) {
 276                         $res = $res->result;
 277                 }
 278
 279                 return $res->fetchRow();
 280         }
 281
 282         /**
 283          * @param ResultWrapper|ORAResult $res
 284          * @return int
 285          */
 286         function numRows( $res ) {
 287                 if ( $res instanceof ResultWrapper ) {
 288                         $res = $res->result;
 289                 }
 290
 291                 return $res->numRows();
 292         }
 293
 294         /**
 295          * @param ResultWrapper|ORAResult $res
 296          * @return int
 297          */
 298         function numFields( $res ) {
 299                 if ( $res instanceof ResultWrapper ) {
 300                         $res = $res->result;
 301                 }
 302
 303                 return $res->numFields();
 304         }
 305
 306         function fieldName( $stmt, $n ) {
 307                 return oci_field_name( $stmt, $n );
 308         }
 309
 310         function insertId() {
 311                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 312                 $row = $this->fetchRow( $res );
 313                 return is_null( $row[0] ) ? null : (int)$row[0];
 314         }
 315
 316         /**
 317          * @param mixed $res
 318          * @param int $row
 319          */
 320         function dataSeek( $res, $row ) {
 321                 if ( $res instanceof ORAResult ) {
 322                         $res->seek( $row );
 323                 } else {
 324                         $res->result->seek( $row );
 325                 }
 326         }
 327
 328         function lastError() {
 329                 if ( $this->conn === false ) {
 330                         $e = oci_error();
 331                 } else {
 332                         $e = oci_error( $this->conn );
 333                 }
 334
 335                 return $e['message'];
 336         }
 337
 338         function lastErrno() {
 339                 if ( $this->conn === false ) {
 340                         $e = oci_error();
 341                 } else {
 342                         $e = oci_error( $this->conn );
 343                 }
 344
 345                 return $e['code'];
 346         }
 347
 348         protected function fetchAffectedRowCount() {
 349                 return $this->mAffectedRows;
 350         }
 351
 352         /**
 353          * Returns information about an index
 354          * If errors are explicitly ignored, returns NULL on failure
 355          * @param string $table
 356          * @param string $index
 357          * @param string $fname
 358          * @return bool
 359          */
 360         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 361                 return false;
 362         }
 363
 364         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 365                 return false;
 366         }
 367
 368         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 369                 if ( !count( $a ) ) {
 370                         return true;
 371                 }
 372
 373                 if ( !is_array( $options ) ) {
 374                         $options = [ $options ];
 375                 }
 376
 377                 if ( in_array( 'IGNORE', $options ) ) {
 378                         $this->ignoreDupValOnIndex = true;
 379                 }
 380
 381                 if ( !is_array( reset( $a ) ) ) {
 382                         $a = [ $a ];
 383                 }
 384
 385                 foreach ( $a as &$row ) {
 386                         $this->insertOneRow( $table, $row, $fname );
 387                 }
 388
 389                 if ( in_array( 'IGNORE', $options ) ) {
 390                         $this->ignoreDupValOnIndex = false;
 391                 }
 392
 393                 return true;
 394         }
 395
 396         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 397                 $col_info = $this->fieldInfoMulti( $table, $col );
 398                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 399
 400                 $bind = '';
 401                 if ( is_numeric( $col ) ) {
 402                         $bind = $val;
 403                         $val = null;
 404
 405                         return $bind;
 406                 } elseif ( $includeCol ) {
 407                         $bind = "$col = ";
 408                 }
 409
 410                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 411                         $val = null;
 412                 }
 413
 414                 if ( $val === 'NULL' ) {
 415                         $val = null;
 416                 }
 417
 418                 if ( $val === null ) {
 419                         if (
 420                                 $col_info != false &&
 421                                 $col_info->isNullable() == 0 &&
 422                                 $col_info->defaultValue() != null
 423                         ) {
 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 (
 485                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
 486                                         strtolower( $val ) == 'infinity'
 487                                 ) {
 488                                         $val = $this->getInfinity();
 489                                 }
 490
 491                                 $val = $this->getVerifiedUTF8( $val );
 492                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 493                                         $e = oci_error( $stmt );
 494                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 495
 496                                         return false;
 497                                 }
 498                         } else {
 499                                 /** @var OCI_Lob[] $lob */
 500                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 501                                 if ( $lob[$col] === false ) {
 502                                         $e = oci_error( $stmt );
 503                                         throw new DBUnexpectedError(
 504                                                 $this,
 505                                                 "Cannot create LOB descriptor: " . $e['message']
 506                                         );
 507                                 }
 508
 509                                 if ( is_object( $val ) ) {
 510                                         $val = $val->fetch();
 511                                 }
 512
 513                                 if ( $col_type == 'BLOB' ) {
 514                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 515                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 516                                 } else {
 517                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 518                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 519                                 }
 520                         }
 521                 }
 522
 523                 Wikimedia\suppressWarnings();
 524
 525                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 526                         $e = oci_error( $stmt );
 527                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 528                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 529
 530                                 return false;
 531                         } else {
 532                                 $this->mAffectedRows = oci_num_rows( $stmt );
 533                         }
 534                 } else {
 535                         $this->mAffectedRows = oci_num_rows( $stmt );
 536                 }
 537
 538                 Wikimedia\restoreWarnings();
 539
 540                 if ( isset( $lob ) ) {
 541                         foreach ( $lob as $lob_v ) {
 542                                 $lob_v->free();
 543                         }
 544                 }
 545
 546                 if ( !$this->trxLevel ) {
 547                         oci_commit( $this->conn );
 548                 }
 549
 550                 return oci_free_statement( $stmt );
 551         }
 552
 553         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 554                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 555         ) {
 556                 $destTable = $this->tableName( $destTable );
 557
 558                 $sequenceData = $this->getSequenceData( $destTable );
 559                 if ( $sequenceData !== false &&
 560                         !isset( $varMap[$sequenceData['column']] )
 561                 ) {
 562                         $varMap[$sequenceData['column']] =
 563                                 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 564                 }
 565
 566                 // count-alias subselect fields to avoid abigious definition errors
 567                 $i = 0;
 568                 foreach ( $varMap as &$val ) {
 569                         $val .= ' field' . $i;
 570                         $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 (" .
 583                         implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 584
 585                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 586                         $this->ignoreDupValOnIndex = true;
 587                 }
 588
 589                 $this->query( $sql, $fname );
 590
 591                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 592                         $this->ignoreDupValOnIndex = false;
 593                 }
 594         }
 595
 596         public function upsert( $table, array $rows, $uniqueIndexes, array $set,
 597                 $fname = __METHOD__
 598         ) {
 599                 if ( $rows === [] ) {
 600                         return true; // nothing to do
 601                 }
 602
 603                 if ( !is_array( reset( $rows ) ) ) {
 604                         $rows = [ $rows ];
 605                 }
 606
 607                 $sequenceData = $this->getSequenceData( $table );
 608                 if ( $sequenceData !== false ) {
 609                         // add sequence column to each list of columns, when not set
 610                         foreach ( $rows as &$row ) {
 611                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 612                                         $row[$sequenceData['column']] =
 613                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 614                                                         $sequenceData['sequence'] . '\')' );
 615                                 }
 616                         }
 617                 }
 618
 619                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 620         }
 621
 622         function tableName( $name, $format = 'quoted' ) {
 623                 /*
 624                 Replace reserved words with better ones
 625                 Using uppercase because that's the only way Oracle can handle
 626                 quoted tablenames
 627                 */
 628                 switch ( $name ) {
 629                         case 'user':
 630                                 $name = 'MWUSER';
 631                                 break;
 632                         case 'text':
 633                                 $name = 'PAGECONTENT';
 634                                 break;
 635                 }
 636
 637                 return strtoupper( parent::tableName( $name, $format ) );
 638         }
 639
 640         function tableNameInternal( $name ) {
 641                 $name = $this->tableName( $name );
 642
 643                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 644         }
 645
 646         /**
 647          * Return sequence_name if table has a sequence
 648          *
 649          * @param string $table
 650          * @return bool
 651          */
 652         private function getSequenceData( $table ) {
 653                 if ( $this->sequenceData == null ) {
 654                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 655                                 lower(atc.table_name),
 656                                 lower(atc.column_name)
 657                         FROM all_sequences asq, all_tab_columns atc
 658                         WHERE decode(
 659                                         atc.table_name,
 660                                         '{$this->tablePrefix}MWUSER',
 661                                         '{$this->tablePrefix}USER',
 662                                         atc.table_name
 663                                 ) || '_' ||
 664                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 665                                 AND asq.sequence_owner = upper('{$this->getDBname()}')
 666                                 AND atc.owner = upper('{$this->getDBname()}')" );
 667
 668                         while ( ( $row = $result->fetchRow() ) !== false ) {
 669                                 $this->sequenceData[$row[1]] = [
 670                                         'sequence' => $row[0],
 671                                         'column' => $row[2]
 672                                 ];
 673                         }
 674                 }
 675                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 676
 677                 return $this->sequenceData[$table] ?? false;
 678         }
 679
 680         /**
 681          * Returns the size of a text field, or -1 for "unlimited"
 682          *
 683          * @param string $table
 684          * @param string $field
 685          * @return mixed
 686          */
 687         function textFieldSize( $table, $field ) {
 688                 $fieldInfoData = $this->fieldInfo( $table, $field );
 689
 690                 return $fieldInfoData->maxLength();
 691         }
 692
 693         function limitResult( $sql, $limit, $offset = false ) {
 694                 if ( $offset === false ) {
 695                         $offset = 0;
 696                 }
 697
 698                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 699         }
 700
 701         function encodeBlob( $b ) {
 702                 return new Blob( $b );
 703         }
 704
 705         function unionQueries( $sqls, $all ) {
 706                 $glue = ' UNION ALL ';
 707
 708                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 709                         'FROM (' . implode( $glue, $sqls ) . ')';
 710         }
 711
 712         function wasDeadlock() {
 713                 return $this->lastErrno() == 'OCI-00060';
 714         }
 715
 716         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 717                 $fname = __METHOD__
 718         ) {
 719                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 720
 721                 $newName = strtoupper( $newName );
 722                 $oldName = strtoupper( $oldName );
 723
 724                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 725                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 726                 $newPrefix = strtoupper( $this->tablePrefix );
 727
 728                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 729                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 730         }
 731
 732         function listTables( $prefix = null, $fname = __METHOD__ ) {
 733                 $listWhere = '';
 734                 if ( !empty( $prefix ) ) {
 735                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 736                 }
 737
 738                 $owner = strtoupper( $this->getDBname() );
 739                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 740                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 741
 742                 // dirty code ... i know
 743                 $endArray = [];
 744                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 745                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 746                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 747                 $fixedOrderTabs = $endArray;
 748                 while ( ( $row = $result->fetchRow() ) !== false ) {
 749                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 750                                 $endArray[] = $row['table_name'];
 751                         }
 752                 }
 753
 754                 return $endArray;
 755         }
 756
 757         public function dropTable( $tableName, $fName = __METHOD__ ) {
 758                 $tableName = $this->tableName( $tableName );
 759                 if ( !$this->tableExists( $tableName ) ) {
 760                         return false;
 761                 }
 762
 763                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 764         }
 765
 766         public function timestamp( $ts = 0 ) {
 767                 $t = new ConvertibleTimestamp( $ts );
 768                 // Let errors bubble up to avoid putting garbage in the DB
 769                 return $t->getTimestamp( TS_ORACLE );
 770         }
 771
 772         /**
 773          * Return aggregated value function call
 774          *
 775          * @param array $valuedata
 776          * @param string $valuename
 777          * @return mixed
 778          */
 779         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 780                 return $valuedata;
 781         }
 782
 783         /**
 784          * @return string Wikitext of a link to the server software's web site
 785          */
 786         public function getSoftwareLink() {
 787                 return '[{{int:version-db-oracle-url}} Oracle]';
 788         }
 789
 790         /**
 791          * @return string Version information from the database
 792          */
 793         function getServerVersion() {
 794                 // better version number, fallback on driver
 795                 $rset = $this->doQuery(
 796                         'SELECT version FROM product_component_version ' .
 797                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 798                 );
 799                 $row = $rset->fetchRow();
 800                 if ( !$row ) {
 801                         return oci_server_version( $this->conn );
 802                 }
 803
 804                 return $row['version'];
 805         }
 806
 807         /**
 808          * Query whether a given index exists
 809          * @param string $table
 810          * @param string $index
 811          * @param string $fname
 812          * @return bool
 813          */
 814         function indexExists( $table, $index, $fname = __METHOD__ ) {
 815                 $table = $this->tableName( $table );
 816                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 817                 $index = strtoupper( $index );
 818                 $owner = strtoupper( $this->getDBname() );
 819                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 820                 $res = $this->doQuery( $sql );
 821                 if ( $res ) {
 822                         $count = $res->numRows();
 823                         $res->free();
 824                 } else {
 825                         $count = 0;
 826                 }
 827
 828                 return $count != 0;
 829         }
 830
 831         /**
 832          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 833          * @param string $table
 834          * @param string $fname
 835          * @return bool
 836          */
 837         function tableExists( $table, $fname = __METHOD__ ) {
 838                 $table = $this->tableName( $table );
 839                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 840                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 841                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 842                 $res = $this->doQuery( $sql );
 843                 if ( $res && $res->numRows() > 0 ) {
 844                         $exists = true;
 845                 } else {
 846                         $exists = false;
 847                 }
 848
 849                 $res->free();
 850
 851                 return $exists;
 852         }
 853
 854         /**
 855          * Function translates mysql_fetch_field() functionality on ORACLE.
 856          * Caching is present for reducing query time.
 857          * For internal calls. Use fieldInfo for normal usage.
 858          * Returns false if the field doesn't exist
 859          *
 860          * @param array|string $table
 861          * @param string $field
 862          * @return ORAField|ORAResult|false
 863          */
 864         private function fieldInfoMulti( $table, $field ) {
 865                 $field = strtoupper( $field );
 866                 if ( is_array( $table ) ) {
 867                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 868                         $tableWhere = 'IN (';
 869                         foreach ( $table as &$singleTable ) {
 870                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 871                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 872                                         return $this->mFieldInfoCache["$singleTable.$field"];
 873                                 }
 874                                 $tableWhere .= '\'' . $singleTable . '\',';
 875                         }
 876                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 877                 } else {
 878                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 879                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 880                                 return $this->mFieldInfoCache["$table.$field"];
 881                         }
 882                         $tableWhere = '= \'' . $table . '\'';
 883                 }
 884
 885                 $fieldInfoStmt = oci_parse(
 886                         $this->conn,
 887                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 888                                 $tableWhere . ' and column_name = \'' . $field . '\''
 889                 );
 890                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 891                         $e = oci_error( $fieldInfoStmt );
 892                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 893
 894                         return false;
 895                 }
 896                 $res = new ORAResult( $this, $fieldInfoStmt );
 897                 if ( $res->numRows() == 0 ) {
 898                         if ( is_array( $table ) ) {
 899                                 foreach ( $table as &$singleTable ) {
 900                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 901                                 }
 902                         } else {
 903                                 $this->mFieldInfoCache["$table.$field"] = false;
 904                         }
 905                         $fieldInfoTemp = null;
 906                 } else {
 907                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 908                         $table = $fieldInfoTemp->tableName();
 909                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 910                 }
 911                 $res->free();
 912
 913                 return $fieldInfoTemp;
 914         }
 915
 916         /**
 917          * @throws DBUnexpectedError
 918          * @param string $table
 919          * @param string $field
 920          * @return ORAField
 921          */
 922         function fieldInfo( $table, $field ) {
 923                 if ( is_array( $table ) ) {
 924                         throw new DBUnexpectedError(
 925                                 $this,
 926                                 'DatabaseOracle::fieldInfo called with table array!'
 927                         );
 928                 }
 929
 930                 return $this->fieldInfoMulti( $table, $field );
 931         }
 932
 933         protected function doBegin( $fname = __METHOD__ ) {
 934                 $this->trxLevel = 1;
 935                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 936         }
 937
 938         protected function doCommit( $fname = __METHOD__ ) {
 939                 if ( $this->trxLevel ) {
 940                         $ret = oci_commit( $this->conn );
 941                         if ( !$ret ) {
 942                                 throw new DBUnexpectedError( $this, $this->lastError() );
 943                         }
 944                         $this->trxLevel = 0;
 945                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 946                 }
 947         }
 948
 949         protected function doRollback( $fname = __METHOD__ ) {
 950                 if ( $this->trxLevel ) {
 951                         oci_rollback( $this->conn );
 952                         $this->trxLevel = 0;
 953                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 954                 }
 955         }
 956
 957         function sourceStream(
 958                 $fp,
 959                 callable $lineCallback = null,
 960                 callable $resultCallback = null,
 961                 $fname = __METHOD__, callable $inputCallback = null
 962         ) {
 963                 $cmd = '';
 964                 $done = false;
 965                 $dollarquote = false;
 966
 967                 $replacements = [];
 968                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 969                 while ( !feof( $fp ) ) {
 970                         if ( $lineCallback ) {
 971                                 $lineCallback();
 972                         }
 973                         $line = trim( fgets( $fp, 1024 ) );
 974                         $sl = strlen( $line ) - 1;
 975
 976                         if ( $sl < 0 ) {
 977                                 continue;
 978                         }
 979                         if ( $line[0] == '-' && $line[1] == '-' ) {
 980                                 continue;
 981                         }
 982
 983                         // Allow dollar quoting for function declarations
 984                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 985                                 if ( $dollarquote ) {
 986                                         $dollarquote = false;
 987                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 988                                         $done = true;
 989                                 } else {
 990                                         $dollarquote = true;
 991                                 }
 992                         } elseif ( !$dollarquote ) {
 993                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 994                                         $done = true;
 995                                         $line = substr( $line, 0, $sl );
 996                                 }
 997                         }
 998
 999                         if ( $cmd != '' ) {
1000                                 $cmd .= ' ';
1001                         }
1002                         $cmd .= "$line\n";
1003
1004                         if ( $done ) {
1005                                 $cmd = str_replace( ';;', ";", $cmd );
1006                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1007                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1008                                                 $replacements[$defines[2]] = $defines[1];
1009                                         }
1010                                 } else {
1011                                         foreach ( $replacements as $mwVar => $scVar ) {
1012                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1013                                         }
1014
1015                                         $cmd = $this->replaceVars( $cmd );
1016                                         if ( $inputCallback ) {
1017                                                 $inputCallback( $cmd );
1018                                         }
1019                                         $res = $this->doQuery( $cmd );
1020                                         if ( $resultCallback ) {
1021                                                 call_user_func( $resultCallback, $res, $this );
1022                                         }
1023
1024                                         if ( $res === false ) {
1025                                                 $err = $this->lastError();
1026
1027                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1028                                         }
1029                                 }
1030
1031                                 $cmd = '';
1032                                 $done = false;
1033                         }
1034                 }
1035
1036                 return true;
1037         }
1038
1039         protected function doSelectDomain( DatabaseDomain $domain ) {
1040                 if ( $domain->getSchema() !== null ) {
1041                         // We use the *database* aspect of $domain for schema, not the domain schema
1042                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1043                 }
1044
1045                 $database = $domain->getDatabase();
1046                 if ( $database === null || $database === $this->user ) {
1047                         // Backward compatibility
1048                         $this->currentDomain = $domain;
1049
1050                         return true;
1051                 }
1052
1053                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1054                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1055                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1056                 $stmt = oci_parse( $this->conn, $sql );
1057                 Wikimedia\suppressWarnings();
1058                 $success = oci_execute( $stmt );
1059                 Wikimedia\restoreWarnings();
1060                 if ( $success ) {
1061                         // Update that domain fields on success (no exception thrown)
1062                         $this->currentDomain = $domain;
1063                 } else {
1064                         $e = oci_error( $stmt );
1065                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1066                 }
1067
1068                 return true;
1069         }
1070
1071         function strencode( $s ) {
1072                 return str_replace( "'", "''", $s );
1073         }
1074
1075         function addQuotes( $s ) {
1076                 return "'" . $this->strencode( $this->getVerifiedUTF8( $s ) ) . "'";
1077         }
1078
1079         public function addIdentifierQuotes( $s ) {
1080                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1081                         $s = '/*Q*/' . $s;
1082                 }
1083
1084                 return $s;
1085         }
1086
1087         public function removeIdentifierQuotes( $s ) {
1088                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1089         }
1090
1091         public function isQuotedIdentifier( $s ) {
1092                 return strpos( $s, '/*Q*/' ) !== false;
1093         }
1094
1095         private function wrapFieldForWhere( $table, &$col, &$val ) {
1096                 $col_info = $this->fieldInfoMulti( $table, $col );
1097                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1098                 if ( $col_type == 'CLOB' ) {
1099                         $col = 'TO_CHAR(' . $col . ')';
1100                         $val = $this->getVerifiedUTF8( $val );
1101                 } elseif ( $col_type == 'VARCHAR2' ) {
1102                         $val = $this->getVerifiedUTF8( $val );
1103                 }
1104         }
1105
1106         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1107                 $conds2 = [];
1108                 foreach ( $conds as $col => $val ) {
1109                         if ( is_array( $val ) ) {
1110                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1111                         } else {
1112                                 if ( is_numeric( $col ) && $parentCol != null ) {
1113                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1114                                 } else {
1115                                         $this->wrapFieldForWhere( $table, $col, $val );
1116                                 }
1117                                 $conds2[$col] = $val;
1118                         }
1119                 }
1120
1121                 return $conds2;
1122         }
1123
1124         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1125                 $options = [], $join_conds = []
1126         ) {
1127                 if ( is_array( $conds ) ) {
1128                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1129                 }
1130
1131                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1132         }
1133
1134         /**
1135          * Returns an optional USE INDEX clause to go after the table, and a
1136          * string to go at the end of the query
1137          *
1138          * @param array $options An associative array of options to be turned into
1139          *   an SQL query, valid keys are listed in the function.
1140          * @return array
1141          */
1142         function makeSelectOptions( $options ) {
1143                 $preLimitTail = $postLimitTail = '';
1144                 $startOpts = '';
1145
1146                 $noKeyOptions = [];
1147                 foreach ( $options as $key => $option ) {
1148                         if ( is_numeric( $key ) ) {
1149                                 $noKeyOptions[$option] = true;
1150                         }
1151                 }
1152
1153                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1154
1155                 $preLimitTail .= $this->makeOrderBy( $options );
1156
1157                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1158                         $postLimitTail .= ' FOR UPDATE';
1159                 }
1160
1161                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1162                         $startOpts .= 'DISTINCT';
1163                 }
1164
1165                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1166                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1167                 } else {
1168                         $useIndex = '';
1169                 }
1170
1171                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1172                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1173                 } else {
1174                         $ignoreIndex = '';
1175                 }
1176
1177                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1178         }
1179
1180         public function delete( $table, $conds, $fname = __METHOD__ ) {
1181                 global $wgActorTableSchemaMigrationStage;
1182
1183                 if ( is_array( $conds ) ) {
1184                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1185                 }
1186                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1187                 // all deletions on these tables have transactions so final failure rollbacks these updates
1188                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1189                 $table = $this->tableName( $table );
1190                 if ( $table == $this->tableName( 'user' ) &&
1191                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1192                 ) {
1193                         $this->update( 'archive', [ 'ar_user' => 0 ],
1194                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1195                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1196                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1197                         $this->update( 'image', [ 'img_user' => 0 ],
1198                                 [ 'img_user' => $conds['user_id'] ], $fname );
1199                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1200                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1201                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1202                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1203                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1204                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1205                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1206                                 [ 'us_user' => $conds['user_id'] ], $fname );
1207                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1208                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1209                         $this->update( 'logging', [ 'log_user' => 0 ],
1210                                 [ 'log_user' => $conds['user_id'] ], $fname );
1211                 } elseif ( $table == $this->tableName( 'image' ) ) {
1212                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1213                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1214                 }
1215
1216                 return parent::delete( $table, $conds, $fname );
1217         }
1218
1219         /**
1220          * @param string $table
1221          * @param array $values
1222          * @param array $conds
1223          * @param string $fname
1224          * @param array $options
1225          * @return bool
1226          * @throws DBUnexpectedError
1227          */
1228         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1229                 $table = $this->tableName( $table );
1230                 $opts = $this->makeUpdateOptions( $options );
1231                 $sql = "UPDATE $opts $table SET ";
1232
1233                 $first = true;
1234                 foreach ( $values as $col => &$val ) {
1235                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1236
1237                         if ( !$first ) {
1238                                 $sqlSet = ', ' . $sqlSet;
1239                         } else {
1240                                 $first = false;
1241                         }
1242                         $sql .= $sqlSet;
1243                 }
1244
1245                 if ( $conds !== [] && $conds !== '*' ) {
1246                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1247                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1248                 }
1249
1250                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1251                 if ( $stmt === false ) {
1252                         $e = oci_error( $this->conn );
1253                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1254
1255                         return false;
1256                 }
1257                 foreach ( $values as $col => &$val ) {
1258                         $col_info = $this->fieldInfoMulti( $table, $col );
1259                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1260
1261                         if ( $val === null ) {
1262                                 // do nothing ... null was inserted in statement creation
1263                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1264                                 if ( is_object( $val ) ) {
1265                                         $val = $val->getData();
1266                                 }
1267
1268                                 if (
1269                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
1270                                         strtolower( $val ) == 'infinity'
1271                                 ) {
1272                                         $val = '31-12-2030 12:00:00.000000';
1273                                 }
1274
1275                                 $val = $this->getVerifiedUTF8( $val );
1276                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1277                                         $e = oci_error( $stmt );
1278                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1279
1280                                         return false;
1281                                 }
1282                         } else {
1283                                 /** @var OCI_Lob[] $lob */
1284                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1285                                 if ( $lob[$col] === false ) {
1286                                         $e = oci_error( $stmt );
1287                                         throw new DBUnexpectedError(
1288                                                 $this,
1289                                                 "Cannot create LOB descriptor: " . $e['message']
1290                                         );
1291                                 }
1292
1293                                 if ( is_object( $val ) ) {
1294                                         $val = $val->getData();
1295                                 }
1296
1297                                 if ( $col_type == 'BLOB' ) {
1298                                         $lob[$col]->writeTemporary( $val );
1299                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1300                                 } else {
1301                                         $lob[$col]->writeTemporary( $val );
1302                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1303                                 }
1304                         }
1305                 }
1306
1307                 Wikimedia\suppressWarnings();
1308
1309                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1310                         $e = oci_error( $stmt );
1311                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1312                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1313
1314                                 return false;
1315                         } else {
1316                                 $this->mAffectedRows = oci_num_rows( $stmt );
1317                         }
1318                 } else {
1319                         $this->mAffectedRows = oci_num_rows( $stmt );
1320                 }
1321
1322                 Wikimedia\restoreWarnings();
1323
1324                 if ( isset( $lob ) ) {
1325                         foreach ( $lob as $lob_v ) {
1326                                 $lob_v->free();
1327                         }
1328                 }
1329
1330                 if ( !$this->trxLevel ) {
1331                         oci_commit( $this->conn );
1332                 }
1333
1334                 return oci_free_statement( $stmt );
1335         }
1336
1337         function bitNot( $field ) {
1338                 // expecting bit-fields smaller than 4bytes
1339                 return 'BITNOT(' . $field . ')';
1340         }
1341
1342         function bitAnd( $fieldLeft, $fieldRight ) {
1343                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1344         }
1345
1346         function bitOr( $fieldLeft, $fieldRight ) {
1347                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1348         }
1349
1350         public function buildGroupConcatField(
1351                 $delim, $table, $field, $conds = '', $join_conds = []
1352         ) {
1353                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1354
1355                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1356         }
1357
1358         public function buildSubstring( $input, $startPosition, $length = null ) {
1359                 $this->assertBuildSubstringParams( $startPosition, $length );
1360                 $params = [ $input, $startPosition ];
1361                 if ( $length !== null ) {
1362                         $params[] = $length;
1363                 }
1364                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1365         }
1366
1367         /**
1368          * @param string $field Field or column to cast
1369          * @return string
1370          * @since 1.28
1371          */
1372         public function buildStringCast( $field ) {
1373                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1374         }
1375
1376         public function getInfinity() {
1377                 return '31-12-2030 12:00:00.000000';
1378         }
1379
1380         /**
1381          * @param string $s
1382          * @return string
1383          */
1384         private function getVerifiedUTF8( $s ) {
1385                 if ( mb_check_encoding( (string)$s, 'UTF-8' ) ) {
1386                         return $s; // valid
1387                 }
1388
1389                 throw new DBUnexpectedError( $this, "Non BLOB/CLOB field must be UTF-8." );
1390         }
1391 }