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\AtEase\AtEase;
  25 use Wikimedia\Timestamp\ConvertibleTimestamp;
  26 use Wikimedia\Rdbms\Database;
  27 use Wikimedia\Rdbms\DatabaseDomain;
  28 use Wikimedia\Rdbms\Blob;
  29 use Wikimedia\Rdbms\ResultWrapper;
  30 use Wikimedia\Rdbms\IResultWrapper;
  31 use Wikimedia\Rdbms\DBConnectionError;
  32 use Wikimedia\Rdbms\DBUnexpectedError;
  33 use Wikimedia\Rdbms\DBExpectedError;
  34
  35 /**
  36  * @ingroup Database
  37  */
  38 class DatabaseOracle extends Database {
  39         /** @var resource */
  40         protected $mLastResult = null;
  41
  42         /** @var int The number of rows affected as an integer */
  43         protected $mAffectedRows;
  44
  45         /** @var bool */
  46         private $ignoreDupValOnIndex = false;
  47
  48         /** @var bool|array */
  49         private $sequenceData = null;
  50
  51         /** @var string Character set for Oracle database */
  52         private $defaultCharset = 'AL32UTF8';
  53
  54         /** @var array */
  55         private $mFieldInfoCache = [];
  56
  57         /** @var string[] Map of (reserved table name => alternate table name) */
  58         private $keywordTableMap = [];
  59
  60         /**
  61          * @see Database::__construct()
  62          * @param array $params Additional parameters include:
  63          *   - keywordTableMap : Map of reserved table names to alternative table names to use
  64          */
  65         function __construct( array $params ) {
  66                 $this->keywordTableMap = $params['keywordTableMap'] ?? [];
  67                 $params['tablePrefix'] = strtoupper( $params['tablePrefix'] );
  68                 parent::__construct( $params );
  69         }
  70
  71         function __destruct() {
  72                 if ( $this->conn ) {
  73                         AtEase::suppressWarnings();
  74                         $this->close();
  75                         AtEase::restoreWarnings();
  76                 }
  77         }
  78
  79         function getType() {
  80                 return 'oracle';
  81         }
  82
  83         function implicitGroupby() {
  84                 return false;
  85         }
  86
  87         function implicitOrderby() {
  88                 return false;
  89         }
  90
  91         protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
  92                 if ( !function_exists( 'oci_connect' ) ) {
  93                         throw new DBConnectionError(
  94                                 $this,
  95                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  96                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  97                                         "and database)\n" );
  98                 }
  99
 100                 $this->close();
 101                 $this->user = $user;
 102                 $this->password = $password;
 103                 if ( !$server ) {
 104                         // Backward compatibility (server used to be null and TNS was supplied in dbname)
 105                         $this->server = $dbName;
 106                         $realDatabase = $user;
 107                 } else {
 108                         // $server now holds the TNS endpoint
 109                         $this->server = $server;
 110                         // $dbName is schema name if different from username
 111                         $realDatabase = $dbName ?: $user;
 112                 }
 113
 114                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 115                         return null;
 116                 }
 117
 118                 $session_mode = ( $this->flags & DBO_SYSDBA ) ? OCI_SYSDBA : OCI_DEFAULT;
 119
 120                 Wikimedia\suppressWarnings();
 121                 if ( $this->flags & DBO_PERSISTENT ) {
 122                         $this->conn = oci_pconnect(
 123                                 $this->user,
 124                                 $this->password,
 125                                 $this->server,
 126                                 $this->defaultCharset,
 127                                 $session_mode
 128                         );
 129                 } elseif ( $this->flags & DBO_DEFAULT ) {
 130                         $this->conn = oci_new_connect(
 131                                 $this->user,
 132                                 $this->password,
 133                                 $this->server,
 134                                 $this->defaultCharset,
 135                                 $session_mode
 136                         );
 137                 } else {
 138                         $this->conn = oci_connect(
 139                                 $this->user,
 140                                 $this->password,
 141                                 $this->server,
 142                                 $this->defaultCharset,
 143                                 $session_mode
 144                         );
 145                 }
 146                 Wikimedia\restoreWarnings();
 147
 148                 if ( $this->user != $realDatabase ) {
 149                         // change current schema in session
 150                         $this->selectDB( $realDatabase );
 151                 } else {
 152                         $this->currentDomain = new DatabaseDomain(
 153                                 $realDatabase,
 154                                 null,
 155                                 $tablePrefix
 156                         );
 157                 }
 158
 159                 if ( !$this->conn ) {
 160                         throw new DBConnectionError( $this, $this->lastError() );
 161                 }
 162
 163                 # removed putenv calls because they interfere with the system globaly
 164                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 165                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 166                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 167
 168                 return (bool)$this->conn;
 169         }
 170
 171         /**
 172          * Closes a database connection, if it is open
 173          * Returns success, true if already closed
 174          * @return bool
 175          */
 176         protected function closeConnection() {
 177                 return oci_close( $this->conn );
 178         }
 179
 180         function execFlags() {
 181                 return $this->trxLevel() ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 182         }
 183
 184         /**
 185          * @param string $sql
 186          * @return bool|mixed|ORAResult
 187          */
 188         protected function doQuery( $sql ) {
 189                 if ( !mb_check_encoding( (string)$sql, 'UTF-8' ) ) {
 190                         throw new DBUnexpectedError( $this, "SQL encoding is invalid\n$sql" );
 191                 }
 192
 193                 // handle some oracle specifics
 194                 // remove AS column/table/subquery namings
 195                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 196                         $sql = preg_replace( '/ as /i', ' ', $sql );
 197                 }
 198
 199                 // Oracle has issues with UNION clause if the statement includes LOB fields
 200                 // So we do a UNION ALL and then filter the results array with array_unique
 201                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 202                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 203                 // you have to select data from plan table after explain
 204                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 205
 206                 $sql = preg_replace(
 207                         '/^EXPLAIN /',
 208                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 209                         $sql,
 210                         1,
 211                         $explain_count
 212                 );
 213
 214                 Wikimedia\suppressWarnings();
 215
 216                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 217                 if ( $stmt === false ) {
 218                         $e = oci_error( $this->conn );
 219                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 220
 221                         return false;
 222                 }
 223
 224                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 225                         $e = oci_error( $stmt );
 226                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 227                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 228
 229                                 return false;
 230                         }
 231                 }
 232
 233                 Wikimedia\restoreWarnings();
 234
 235                 if ( $explain_count > 0 ) {
 236                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 237                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 238                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 239                         return new ORAResult( $this, $stmt, $union_unique );
 240                 } else {
 241                         $this->mAffectedRows = oci_num_rows( $stmt );
 242
 243                         return true;
 244                 }
 245         }
 246
 247         function queryIgnore( $sql, $fname = '' ) {
 248                 return $this->query( $sql, $fname, true );
 249         }
 250
 251         /**
 252          * Frees resources associated with the LOB descriptor
 253          * @param IResultWrapper|ORAResult $res
 254          */
 255         function freeResult( $res ) {
 256                 ResultWrapper::unwrap( $res )->free();
 257         }
 258
 259         /**
 260          * @param IResultWrapper|ORAResult $res
 261          * @return stdClass|bool
 262          */
 263         function fetchObject( $res ) {
 264                 return ResultWrapper::unwrap( $res )->fetchObject();
 265         }
 266
 267         /**
 268          * @param IResultWrapper|ORAResult $res
 269          * @return stdClass|bool
 270          */
 271         function fetchRow( $res ) {
 272                 return ResultWrapper::unwrap( $res )->fetchRow();
 273         }
 274
 275         /**
 276          * @param IResultWrapper|ORAResult $res
 277          * @return int
 278          */
 279         function numRows( $res ) {
 280                 return ResultWrapper::unwrap( $res )->numRows();
 281         }
 282
 283         /**
 284          * @param IResultWrapper|ORAResult $res
 285          * @return int
 286          */
 287         function numFields( $res ) {
 288                 return ResultWrapper::unwrap( $res )->numFields();
 289         }
 290
 291         function fieldName( $stmt, $n ) {
 292                 return oci_field_name( $stmt, $n );
 293         }
 294
 295         function insertId() {
 296                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 297                 $row = $this->fetchRow( $res );
 298                 return is_null( $row[0] ) ? null : (int)$row[0];
 299         }
 300
 301         /**
 302          * @param mixed $res
 303          * @param int $row
 304          */
 305         function dataSeek( $res, $row ) {
 306                 if ( $res instanceof ORAResult ) {
 307                         $res->seek( $row );
 308                 } else {
 309                         ResultWrapper::unwrap( $res )->seek( $row );
 310                 }
 311         }
 312
 313         function lastError() {
 314                 if ( $this->conn === false ) {
 315                         $e = oci_error();
 316                 } else {
 317                         $e = oci_error( $this->conn );
 318                 }
 319
 320                 return $e['message'];
 321         }
 322
 323         function lastErrno() {
 324                 if ( $this->conn === false ) {
 325                         $e = oci_error();
 326                 } else {
 327                         $e = oci_error( $this->conn );
 328                 }
 329
 330                 return $e['code'];
 331         }
 332
 333         protected function fetchAffectedRowCount() {
 334                 return $this->mAffectedRows;
 335         }
 336
 337         /**
 338          * Returns information about an index
 339          * If errors are explicitly ignored, returns NULL on failure
 340          * @param string $table
 341          * @param string $index
 342          * @param string $fname
 343          * @return bool
 344          */
 345         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 346                 return false;
 347         }
 348
 349         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 350                 return false;
 351         }
 352
 353         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 354                 if ( !count( $a ) ) {
 355                         return true;
 356                 }
 357
 358                 if ( !is_array( $options ) ) {
 359                         $options = [ $options ];
 360                 }
 361
 362                 if ( in_array( 'IGNORE', $options ) ) {
 363                         $this->ignoreDupValOnIndex = true;
 364                 }
 365
 366                 if ( !is_array( reset( $a ) ) ) {
 367                         $a = [ $a ];
 368                 }
 369
 370                 foreach ( $a as &$row ) {
 371                         $this->insertOneRow( $table, $row, $fname );
 372                 }
 373
 374                 if ( in_array( 'IGNORE', $options ) ) {
 375                         $this->ignoreDupValOnIndex = false;
 376                 }
 377
 378                 return true;
 379         }
 380
 381         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 382                 $col_info = $this->fieldInfoMulti( $table, $col );
 383                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 384
 385                 $bind = '';
 386                 if ( is_numeric( $col ) ) {
 387                         $bind = $val;
 388                         $val = null;
 389
 390                         return $bind;
 391                 } elseif ( $includeCol ) {
 392                         $bind = "$col = ";
 393                 }
 394
 395                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 396                         $val = null;
 397                 }
 398
 399                 if ( $val === 'NULL' ) {
 400                         $val = null;
 401                 }
 402
 403                 if ( $val === null ) {
 404                         if (
 405                                 $col_info != false &&
 406                                 $col_info->isNullable() == 0 &&
 407                                 $col_info->defaultValue() != null
 408                         ) {
 409                                 $bind .= 'DEFAULT';
 410                         } else {
 411                                 $bind .= 'NULL';
 412                         }
 413                 } else {
 414                         $bind .= ':' . $col;
 415                 }
 416
 417                 return $bind;
 418         }
 419
 420         /**
 421          * @param string $table
 422          * @param array $row
 423          * @param string $fname
 424          * @return bool
 425          * @throws DBUnexpectedError
 426          */
 427         private function insertOneRow( $table, $row, $fname ) {
 428                 $table = $this->tableName( $table );
 429                 // "INSERT INTO tables (a, b, c)"
 430                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 431                 $sql .= " VALUES (";
 432
 433                 // for each value, append ":key"
 434                 $first = true;
 435                 foreach ( $row as $col => &$val ) {
 436                         if ( !$first ) {
 437                                 $sql .= ', ';
 438                         } else {
 439                                 $first = false;
 440                         }
 441                         if ( $this->isQuotedIdentifier( $val ) ) {
 442                                 $sql .= $this->removeIdentifierQuotes( $val );
 443                                 unset( $row[$col] );
 444                         } else {
 445                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 446                         }
 447                 }
 448                 $sql .= ')';
 449
 450                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 451                 if ( $stmt === false ) {
 452                         $e = oci_error( $this->conn );
 453                         $this->reportQueryError( $e['message'], $e['code'], $sql, $fname );
 454
 455                         return false;
 456                 }
 457                 foreach ( $row as $col => &$val ) {
 458                         $col_info = $this->fieldInfoMulti( $table, $col );
 459                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 460
 461                         if ( $val === null ) {
 462                                 // do nothing ... null was inserted in statement creation
 463                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 464                                 if ( is_object( $val ) ) {
 465                                         $val = $val->fetch();
 466                                 }
 467
 468                                 // backward compatibility
 469                                 if (
 470                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
 471                                         strtolower( $val ) == 'infinity'
 472                                 ) {
 473                                         $val = $this->getInfinity();
 474                                 }
 475
 476                                 $val = $this->getVerifiedUTF8( $val );
 477                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 478                                         $e = oci_error( $stmt );
 479                                         $this->reportQueryError( $e['message'], $e['code'], $sql, $fname );
 480
 481                                         return false;
 482                                 }
 483                         } else {
 484                                 /** @var OCI_Lob[] $lob */
 485                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 486                                 if ( $lob[$col] === false ) {
 487                                         $e = oci_error( $stmt );
 488                                         throw new DBUnexpectedError(
 489                                                 $this,
 490                                                 "Cannot create LOB descriptor: " . $e['message']
 491                                         );
 492                                 }
 493
 494                                 if ( is_object( $val ) ) {
 495                                         $val = $val->fetch();
 496                                 }
 497
 498                                 if ( $col_type == 'BLOB' ) {
 499                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 500                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 501                                 } else {
 502                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 503                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 504                                 }
 505                         }
 506                 }
 507
 508                 Wikimedia\suppressWarnings();
 509
 510                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 511                         $e = oci_error( $stmt );
 512                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 513                                 $this->reportQueryError( $e['message'], $e['code'], $sql, $fname );
 514
 515                                 return false;
 516                         } else {
 517                                 $this->mAffectedRows = oci_num_rows( $stmt );
 518                         }
 519                 } else {
 520                         $this->mAffectedRows = oci_num_rows( $stmt );
 521                 }
 522
 523                 Wikimedia\restoreWarnings();
 524
 525                 if ( isset( $lob ) ) {
 526                         foreach ( $lob as $lob_v ) {
 527                                 $lob_v->free();
 528                         }
 529                 }
 530
 531                 if ( !$this->trxLevel() ) {
 532                         oci_commit( $this->conn );
 533                 }
 534
 535                 return oci_free_statement( $stmt );
 536         }
 537
 538         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 539                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 540         ) {
 541                 $destTable = $this->tableName( $destTable );
 542
 543                 $sequenceData = $this->getSequenceData( $destTable );
 544                 if ( $sequenceData !== false &&
 545                         !isset( $varMap[$sequenceData['column']] )
 546                 ) {
 547                         $varMap[$sequenceData['column']] =
 548                                 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 549                 }
 550
 551                 // count-alias subselect fields to avoid abigious definition errors
 552                 $i = 0;
 553                 foreach ( $varMap as &$val ) {
 554                         $val .= ' field' . $i;
 555                         $i++;
 556                 }
 557
 558                 $selectSql = $this->selectSQLText(
 559                         $srcTable,
 560                         array_values( $varMap ),
 561                         $conds,
 562                         $fname,
 563                         $selectOptions,
 564                         $selectJoinConds
 565                 );
 566
 567                 $sql = "INSERT INTO $destTable (" .
 568                         implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 569
 570                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 571                         $this->ignoreDupValOnIndex = true;
 572                 }
 573
 574                 $this->query( $sql, $fname );
 575
 576                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 577                         $this->ignoreDupValOnIndex = false;
 578                 }
 579         }
 580
 581         public function upsert( $table, array $rows, $uniqueIndexes, array $set,
 582                 $fname = __METHOD__
 583         ) {
 584                 if ( $rows === [] ) {
 585                         return true; // nothing to do
 586                 }
 587
 588                 if ( !is_array( reset( $rows ) ) ) {
 589                         $rows = [ $rows ];
 590                 }
 591
 592                 $sequenceData = $this->getSequenceData( $table );
 593                 if ( $sequenceData !== false ) {
 594                         // add sequence column to each list of columns, when not set
 595                         foreach ( $rows as &$row ) {
 596                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 597                                         $row[$sequenceData['column']] =
 598                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 599                                                         $sequenceData['sequence'] . '\')' );
 600                                 }
 601                         }
 602                 }
 603
 604                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 605         }
 606
 607         public function tableName( $name, $format = 'quoted' ) {
 608                 // Replace reserved words with better ones
 609                 $name = $this->remappedTableName( $name );
 610
 611                 return strtoupper( parent::tableName( $name, $format ) );
 612         }
 613
 614         /**
 615          * @param string $name
 616          * @return string Value of $name or remapped name if $name is a reserved keyword
 617          */
 618         public function remappedTableName( $name ) {
 619                 return $this->keywordTableMap[$name] ?? $name;
 620         }
 621
 622         function tableNameInternal( $name ) {
 623                 $name = $this->tableName( $name );
 624
 625                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 626         }
 627
 628         /**
 629          * Return sequence_name if table has a sequence
 630          *
 631          * @param string $table
 632          * @return string[]|bool
 633          */
 634         private function getSequenceData( $table ) {
 635                 if ( $this->sequenceData == null ) {
 636                         $dbname = $this->currentDomain->getDatabase();
 637                         $prefix = $this->currentDomain->getTablePrefix();
 638                         // See https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm
 639                         $decodeArgs = [ 'atc.table_name' ]; // the switch
 640                         foreach ( $this->keywordTableMap as $reserved => $alternative ) {
 641                                 $search = strtoupper( $prefix . $alternative ); // case
 642                                 $replace = strtoupper( $prefix . $reserved ); // result
 643                                 $decodeArgs[] = $this->addQuotes( $search );
 644                                 $decodeArgs[] = $this->addQuotes( $replace );
 645                         }
 646                         $decodeArgs[] = [ 'atc.table_name' ]; // default
 647                         $decodeArgs = implode( ', ', $decodeArgs );
 648
 649                         $result = $this->doQuery(
 650                                 "SELECT lower(asq.sequence_name), lower(atc.table_name), lower(atc.column_name)
 651                                 FROM all_sequences asq, all_tab_columns atc
 652                                 WHERE decode({$decodeArgs}) || '_' ||
 653                                 atc.column_name || '_SEQ' = '{$prefix}' || asq.sequence_name
 654                                 AND asq.sequence_owner = upper('{$dbname}')
 655                                 AND atc.owner = upper('{$dbname}')"
 656                         );
 657
 658                         while ( ( $row = $result->fetchRow() ) !== false ) {
 659                                 $this->sequenceData[$row[1]] = [
 660                                         'sequence' => $row[0],
 661                                         'column' => $row[2]
 662                                 ];
 663                         }
 664                 }
 665                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 666
 667                 return $this->sequenceData[$table] ?? false;
 668         }
 669
 670         /**
 671          * Returns the size of a text field, or -1 for "unlimited"
 672          *
 673          * @param string $table
 674          * @param string $field
 675          * @return mixed
 676          */
 677         function textFieldSize( $table, $field ) {
 678                 $fieldInfoData = $this->fieldInfo( $table, $field );
 679
 680                 return $fieldInfoData->maxLength();
 681         }
 682
 683         function limitResult( $sql, $limit, $offset = false ) {
 684                 if ( $offset === false ) {
 685                         $offset = 0;
 686                 }
 687
 688                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 689         }
 690
 691         function encodeBlob( $b ) {
 692                 return new Blob( $b );
 693         }
 694
 695         function unionQueries( $sqls, $all ) {
 696                 $glue = ' UNION ALL ';
 697
 698                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 699                         'FROM (' . implode( $glue, $sqls ) . ')';
 700         }
 701
 702         function wasDeadlock() {
 703                 return $this->lastErrno() == 'OCI-00060';
 704         }
 705
 706         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 707                 $fname = __METHOD__
 708         ) {
 709                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 710                 $tablePrefix = $this->currentDomain->getTablePrefix();
 711
 712                 $newName = strtoupper( $newName );
 713                 $oldName = strtoupper( $oldName );
 714
 715                 $tabName = substr( $newName, strlen( $tablePrefix ) );
 716                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 717                 $newPrefix = strtoupper( $tablePrefix );
 718
 719                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 720                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 721         }
 722
 723         function listTables( $prefix = null, $fname = __METHOD__ ) {
 724                 $listWhere = '';
 725                 if ( !empty( $prefix ) ) {
 726                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 727                 }
 728
 729                 $owner = strtoupper( $this->getDBname() );
 730                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 731                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 732
 733                 // dirty code ... i know
 734                 $endArray = [];
 735                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 736                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 737                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 738                 $fixedOrderTabs = $endArray;
 739                 while ( ( $row = $result->fetchRow() ) !== false ) {
 740                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 741                                 $endArray[] = $row['table_name'];
 742                         }
 743                 }
 744
 745                 return $endArray;
 746         }
 747
 748         public function dropTable( $tableName, $fName = __METHOD__ ) {
 749                 $tableName = $this->tableName( $tableName );
 750                 if ( !$this->tableExists( $tableName ) ) {
 751                         return false;
 752                 }
 753
 754                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 755         }
 756
 757         public function timestamp( $ts = 0 ) {
 758                 $t = new ConvertibleTimestamp( $ts );
 759                 // Let errors bubble up to avoid putting garbage in the DB
 760                 return $t->getTimestamp( TS_ORACLE );
 761         }
 762
 763         /**
 764          * Return aggregated value function call
 765          *
 766          * @param array $valuedata
 767          * @param string $valuename
 768          * @return mixed
 769          */
 770         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 771                 return $valuedata;
 772         }
 773
 774         /**
 775          * @return string Wikitext of a link to the server software's web site
 776          */
 777         public function getSoftwareLink() {
 778                 return '[{{int:version-db-oracle-url}} Oracle]';
 779         }
 780
 781         /**
 782          * @return string Version information from the database
 783          */
 784         function getServerVersion() {
 785                 // better version number, fallback on driver
 786                 $rset = $this->doQuery(
 787                         'SELECT version FROM product_component_version ' .
 788                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 789                 );
 790                 $row = $rset->fetchRow();
 791                 if ( !$row ) {
 792                         return oci_server_version( $this->conn );
 793                 }
 794
 795                 return $row['version'];
 796         }
 797
 798         /**
 799          * Query whether a given index exists
 800          * @param string $table
 801          * @param string $index
 802          * @param string $fname
 803          * @return bool
 804          */
 805         function indexExists( $table, $index, $fname = __METHOD__ ) {
 806                 $table = $this->tableName( $table );
 807                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 808                 $index = strtoupper( $index );
 809                 $owner = strtoupper( $this->getDBname() );
 810                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 811                 $res = $this->doQuery( $sql );
 812                 if ( $res ) {
 813                         $count = $res->numRows();
 814                         $res->free();
 815                 } else {
 816                         $count = 0;
 817                 }
 818
 819                 return $count != 0;
 820         }
 821
 822         /**
 823          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 824          * @param string $table
 825          * @param string $fname
 826          * @return bool
 827          */
 828         function tableExists( $table, $fname = __METHOD__ ) {
 829                 $table = $this->tableName( $table );
 830                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 831                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 832                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 833                 $res = $this->doQuery( $sql );
 834                 if ( $res && $res->numRows() > 0 ) {
 835                         $exists = true;
 836                 } else {
 837                         $exists = false;
 838                 }
 839
 840                 $res->free();
 841
 842                 return $exists;
 843         }
 844
 845         /**
 846          * Function translates mysql_fetch_field() functionality on ORACLE.
 847          * Caching is present for reducing query time.
 848          * For internal calls. Use fieldInfo for normal usage.
 849          * Returns false if the field doesn't exist
 850          *
 851          * @param array|string $table
 852          * @param string $field
 853          * @return ORAField|ORAResult|false
 854          */
 855         private function fieldInfoMulti( $table, $field ) {
 856                 $field = strtoupper( $field );
 857                 if ( is_array( $table ) ) {
 858                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 859                         $tableWhere = 'IN (';
 860                         foreach ( $table as &$singleTable ) {
 861                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 862                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 863                                         return $this->mFieldInfoCache["$singleTable.$field"];
 864                                 }
 865                                 $tableWhere .= '\'' . $singleTable . '\',';
 866                         }
 867                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 868                 } else {
 869                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 870                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 871                                 return $this->mFieldInfoCache["$table.$field"];
 872                         }
 873                         $tableWhere = '= \'' . $table . '\'';
 874                 }
 875
 876                 $fieldInfoStmt = oci_parse(
 877                         $this->conn,
 878                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 879                                 $tableWhere . ' and column_name = \'' . $field . '\''
 880                 );
 881                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 882                         $e = oci_error( $fieldInfoStmt );
 883                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 884
 885                         return false;
 886                 }
 887                 $res = new ORAResult( $this, $fieldInfoStmt );
 888                 if ( $res->numRows() == 0 ) {
 889                         if ( is_array( $table ) ) {
 890                                 foreach ( $table as &$singleTable ) {
 891                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 892                                 }
 893                         } else {
 894                                 $this->mFieldInfoCache["$table.$field"] = false;
 895                         }
 896                         $fieldInfoTemp = null;
 897                 } else {
 898                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 899                         $table = $fieldInfoTemp->tableName();
 900                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 901                 }
 902                 $res->free();
 903
 904                 return $fieldInfoTemp;
 905         }
 906
 907         /**
 908          * @throws DBUnexpectedError
 909          * @param string $table
 910          * @param string $field
 911          * @return ORAField
 912          */
 913         function fieldInfo( $table, $field ) {
 914                 if ( is_array( $table ) ) {
 915                         throw new DBUnexpectedError(
 916                                 $this,
 917                                 'DatabaseOracle::fieldInfo called with table array!'
 918                         );
 919                 }
 920
 921                 return $this->fieldInfoMulti( $table, $field );
 922         }
 923
 924         protected function doBegin( $fname = __METHOD__ ) {
 925                 $this->query( 'SET CONSTRAINTS ALL DEFERRED' );
 926         }
 927
 928         protected function doCommit( $fname = __METHOD__ ) {
 929                 if ( $this->trxLevel() ) {
 930                         $ret = oci_commit( $this->conn );
 931                         if ( !$ret ) {
 932                                 throw new DBUnexpectedError( $this, $this->lastError() );
 933                         }
 934                         $this->query( 'SET CONSTRAINTS ALL IMMEDIATE' );
 935                 }
 936         }
 937
 938         protected function doRollback( $fname = __METHOD__ ) {
 939                 if ( $this->trxLevel() ) {
 940                         oci_rollback( $this->conn );
 941                         $ignoreErrors = true;
 942                         $this->query( 'SET CONSTRAINTS ALL IMMEDIATE', $fname, $ignoreErrors );
 943                 }
 944         }
 945
 946         function sourceStream(
 947                 $fp,
 948                 callable $lineCallback = null,
 949                 callable $resultCallback = null,
 950                 $fname = __METHOD__, callable $inputCallback = null
 951         ) {
 952                 $cmd = '';
 953                 $done = false;
 954                 $dollarquote = false;
 955
 956                 $replacements = [];
 957                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 958                 while ( !feof( $fp ) ) {
 959                         if ( $lineCallback ) {
 960                                 $lineCallback();
 961                         }
 962                         $line = trim( fgets( $fp, 1024 ) );
 963                         $sl = strlen( $line ) - 1;
 964
 965                         if ( $sl < 0 ) {
 966                                 continue;
 967                         }
 968                         if ( $line[0] == '-' && $line[1] == '-' ) {
 969                                 continue;
 970                         }
 971
 972                         // Allow dollar quoting for function declarations
 973                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 974                                 if ( $dollarquote ) {
 975                                         $dollarquote = false;
 976                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 977                                         $done = true;
 978                                 } else {
 979                                         $dollarquote = true;
 980                                 }
 981                         } elseif ( !$dollarquote ) {
 982                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 983                                         $done = true;
 984                                         $line = substr( $line, 0, $sl );
 985                                 }
 986                         }
 987
 988                         if ( $cmd != '' ) {
 989                                 $cmd .= ' ';
 990                         }
 991                         $cmd .= "$line\n";
 992
 993                         if ( $done ) {
 994                                 $cmd = str_replace( ';;', ";", $cmd );
 995                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
 996                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
 997                                                 $replacements[$defines[2]] = $defines[1];
 998                                         }
 999                                 } else {
1000                                         foreach ( $replacements as $mwVar => $scVar ) {
1001                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1002                                         }
1003
1004                                         $cmd = $this->replaceVars( $cmd );
1005                                         if ( $inputCallback ) {
1006                                                 $inputCallback( $cmd );
1007                                         }
1008                                         $res = $this->doQuery( $cmd );
1009                                         if ( $resultCallback ) {
1010                                                 call_user_func( $resultCallback, $res, $this );
1011                                         }
1012
1013                                         if ( $res === false ) {
1014                                                 $err = $this->lastError();
1015
1016                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1017                                         }
1018                                 }
1019
1020                                 $cmd = '';
1021                                 $done = false;
1022                         }
1023                 }
1024
1025                 return true;
1026         }
1027
1028         protected function doSelectDomain( DatabaseDomain $domain ) {
1029                 if ( $domain->getSchema() !== null ) {
1030                         // We use the *database* aspect of $domain for schema, not the domain schema
1031                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1032                 }
1033
1034                 $database = $domain->getDatabase();
1035                 if ( $database === null || $database === $this->user ) {
1036                         // Backward compatibility
1037                         $this->currentDomain = $domain;
1038
1039                         return true;
1040                 }
1041
1042                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1043                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1044                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1045                 $stmt = oci_parse( $this->conn, $sql );
1046                 Wikimedia\suppressWarnings();
1047                 $success = oci_execute( $stmt );
1048                 Wikimedia\restoreWarnings();
1049                 if ( $success ) {
1050                         // Update that domain fields on success (no exception thrown)
1051                         $this->currentDomain = $domain;
1052                 } else {
1053                         $e = oci_error( $stmt );
1054                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1055                 }
1056
1057                 return true;
1058         }
1059
1060         function strencode( $s ) {
1061                 return str_replace( "'", "''", $s );
1062         }
1063
1064         function addQuotes( $s ) {
1065                 return "'" . $this->strencode( $this->getVerifiedUTF8( $s ) ) . "'";
1066         }
1067
1068         public function addIdentifierQuotes( $s ) {
1069                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1070                         $s = '/*Q*/' . $s;
1071                 }
1072
1073                 return $s;
1074         }
1075
1076         public function removeIdentifierQuotes( $s ) {
1077                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1078         }
1079
1080         public function isQuotedIdentifier( $s ) {
1081                 return strpos( $s, '/*Q*/' ) !== false;
1082         }
1083
1084         private function wrapFieldForWhere( $table, &$col, &$val ) {
1085                 $col_info = $this->fieldInfoMulti( $table, $col );
1086                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1087                 if ( $col_type == 'CLOB' ) {
1088                         $col = 'TO_CHAR(' . $col . ')';
1089                         $val = $this->getVerifiedUTF8( $val );
1090                 } elseif ( $col_type == 'VARCHAR2' ) {
1091                         $val = $this->getVerifiedUTF8( $val );
1092                 }
1093         }
1094
1095         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1096                 $conds2 = [];
1097                 foreach ( $conds as $col => $val ) {
1098                         if ( is_array( $val ) ) {
1099                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1100                         } else {
1101                                 if ( is_numeric( $col ) && $parentCol != null ) {
1102                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1103                                 } else {
1104                                         $this->wrapFieldForWhere( $table, $col, $val );
1105                                 }
1106                                 $conds2[$col] = $val;
1107                         }
1108                 }
1109
1110                 return $conds2;
1111         }
1112
1113         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1114                 $options = [], $join_conds = []
1115         ) {
1116                 if ( is_array( $conds ) ) {
1117                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1118                 }
1119
1120                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1121         }
1122
1123         /**
1124          * Returns an optional USE INDEX clause to go after the table, and a
1125          * string to go at the end of the query
1126          *
1127          * @param array $options An associative array of options to be turned into
1128          *   an SQL query, valid keys are listed in the function.
1129          * @return array
1130          */
1131         function makeSelectOptions( $options ) {
1132                 $preLimitTail = $postLimitTail = '';
1133                 $startOpts = '';
1134
1135                 $noKeyOptions = [];
1136                 foreach ( $options as $key => $option ) {
1137                         if ( is_numeric( $key ) ) {
1138                                 $noKeyOptions[$option] = true;
1139                         }
1140                 }
1141
1142                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1143
1144                 $preLimitTail .= $this->makeOrderBy( $options );
1145
1146                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1147                         $postLimitTail .= ' FOR UPDATE';
1148                 }
1149
1150                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1151                         $startOpts .= 'DISTINCT';
1152                 }
1153
1154                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1155                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1156                 } else {
1157                         $useIndex = '';
1158                 }
1159
1160                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1161                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1162                 } else {
1163                         $ignoreIndex = '';
1164                 }
1165
1166                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1167         }
1168
1169         public function delete( $table, $conds, $fname = __METHOD__ ) {
1170                 global $wgActorTableSchemaMigrationStage;
1171
1172                 if ( is_array( $conds ) ) {
1173                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1174                 }
1175                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1176                 // all deletions on these tables have transactions so final failure rollbacks these updates
1177                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1178                 $table = $this->tableName( $table );
1179                 if ( $table == $this->tableName( 'user' ) &&
1180                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1181                 ) {
1182                         $this->update( 'archive', [ 'ar_user' => 0 ],
1183                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1184                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1185                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1186                         $this->update( 'image', [ 'img_user' => 0 ],
1187                                 [ 'img_user' => $conds['user_id'] ], $fname );
1188                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1189                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1190                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1191                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1192                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1193                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1194                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1195                                 [ 'us_user' => $conds['user_id'] ], $fname );
1196                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1197                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1198                         $this->update( 'logging', [ 'log_user' => 0 ],
1199                                 [ 'log_user' => $conds['user_id'] ], $fname );
1200                 } elseif ( $table == $this->tableName( 'image' ) ) {
1201                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1202                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1203                 }
1204
1205                 return parent::delete( $table, $conds, $fname );
1206         }
1207
1208         /**
1209          * @param string $table
1210          * @param array $values
1211          * @param array $conds
1212          * @param string $fname
1213          * @param array $options
1214          * @return bool
1215          * @throws DBUnexpectedError
1216          */
1217         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1218                 $table = $this->tableName( $table );
1219                 $opts = $this->makeUpdateOptions( $options );
1220                 $sql = "UPDATE $opts $table SET ";
1221
1222                 $first = true;
1223                 foreach ( $values as $col => &$val ) {
1224                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1225
1226                         if ( !$first ) {
1227                                 $sqlSet = ', ' . $sqlSet;
1228                         } else {
1229                                 $first = false;
1230                         }
1231                         $sql .= $sqlSet;
1232                 }
1233
1234                 if ( $conds !== [] && $conds !== '*' ) {
1235                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1236                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1237                 }
1238
1239                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1240                 if ( $stmt === false ) {
1241                         $e = oci_error( $this->conn );
1242                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1243
1244                         return false;
1245                 }
1246                 foreach ( $values as $col => &$val ) {
1247                         $col_info = $this->fieldInfoMulti( $table, $col );
1248                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1249
1250                         if ( $val === null ) {
1251                                 // do nothing ... null was inserted in statement creation
1252                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1253                                 if ( is_object( $val ) ) {
1254                                         $val = $val->getData();
1255                                 }
1256
1257                                 if (
1258                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
1259                                         strtolower( $val ) == 'infinity'
1260                                 ) {
1261                                         $val = '31-12-2030 12:00:00.000000';
1262                                 }
1263
1264                                 $val = $this->getVerifiedUTF8( $val );
1265                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1266                                         $e = oci_error( $stmt );
1267                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1268
1269                                         return false;
1270                                 }
1271                         } else {
1272                                 /** @var OCI_Lob[] $lob */
1273                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1274                                 if ( $lob[$col] === false ) {
1275                                         $e = oci_error( $stmt );
1276                                         throw new DBUnexpectedError(
1277                                                 $this,
1278                                                 "Cannot create LOB descriptor: " . $e['message']
1279                                         );
1280                                 }
1281
1282                                 if ( is_object( $val ) ) {
1283                                         $val = $val->getData();
1284                                 }
1285
1286                                 if ( $col_type == 'BLOB' ) {
1287                                         $lob[$col]->writeTemporary( $val );
1288                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1289                                 } else {
1290                                         $lob[$col]->writeTemporary( $val );
1291                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1292                                 }
1293                         }
1294                 }
1295
1296                 Wikimedia\suppressWarnings();
1297
1298                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1299                         $e = oci_error( $stmt );
1300                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1301                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1302
1303                                 return false;
1304                         } else {
1305                                 $this->mAffectedRows = oci_num_rows( $stmt );
1306                         }
1307                 } else {
1308                         $this->mAffectedRows = oci_num_rows( $stmt );
1309                 }
1310
1311                 Wikimedia\restoreWarnings();
1312
1313                 if ( isset( $lob ) ) {
1314                         foreach ( $lob as $lob_v ) {
1315                                 $lob_v->free();
1316                         }
1317                 }
1318
1319                 if ( !$this->trxLevel() ) {
1320                         oci_commit( $this->conn );
1321                 }
1322
1323                 return oci_free_statement( $stmt );
1324         }
1325
1326         function bitNot( $field ) {
1327                 // expecting bit-fields smaller than 4bytes
1328                 return 'BITNOT(' . $field . ')';
1329         }
1330
1331         function bitAnd( $fieldLeft, $fieldRight ) {
1332                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1333         }
1334
1335         function bitOr( $fieldLeft, $fieldRight ) {
1336                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1337         }
1338
1339         public function buildGroupConcatField(
1340                 $delim, $table, $field, $conds = '', $join_conds = []
1341         ) {
1342                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1343
1344                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1345         }
1346
1347         public function buildSubstring( $input, $startPosition, $length = null ) {
1348                 $this->assertBuildSubstringParams( $startPosition, $length );
1349                 $params = [ $input, $startPosition ];
1350                 if ( $length !== null ) {
1351                         $params[] = $length;
1352                 }
1353                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1354         }
1355
1356         /**
1357          * @param string $field Field or column to cast
1358          * @return string
1359          * @since 1.28
1360          */
1361         public function buildStringCast( $field ) {
1362                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1363         }
1364
1365         public function getInfinity() {
1366                 return '31-12-2030 12:00:00.000000';
1367         }
1368
1369         /**
1370          * @param string $s
1371          * @return string
1372          */
1373         private function getVerifiedUTF8( $s ) {
1374                 if ( mb_check_encoding( (string)$s, 'UTF-8' ) ) {
1375                         return $s; // valid
1376                 }
1377
1378                 throw new DBUnexpectedError( $this, "Non BLOB/CLOB field must be UTF-8." );
1379         }
1380 }