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         public 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                 if ( $schema !== null ) {
 101                         // We use the *database* aspect of $domain for schema, not the domain schema
 102                         throw new DBExpectedError(
 103                                 $this,
 104                                 __CLASS__ . ": cannot use schema '$schema'; " .
 105                                 "the database component '$dbName' is actually interpreted as the Oracle schema."
 106                         );
 107                 }
 108
 109                 $this->close();
 110                 $this->user = $user;
 111                 $this->password = $password;
 112                 if ( !$server ) {
 113                         // Backward compatibility (server used to be null and TNS was supplied in dbname)
 114                         $this->server = $dbName;
 115                         $realDatabase = $user;
 116                 } else {
 117                         // $server now holds the TNS endpoint
 118                         $this->server = $server;
 119                         // $dbName is schema name if different from username
 120                         $realDatabase = $dbName ?: $user;
 121                 }
 122
 123                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 124                         return null;
 125                 }
 126
 127                 $session_mode = ( $this->flags & DBO_SYSDBA ) ? OCI_SYSDBA : OCI_DEFAULT;
 128
 129                 Wikimedia\suppressWarnings();
 130                 if ( $this->flags & DBO_PERSISTENT ) {
 131                         $this->conn = oci_pconnect(
 132                                 $this->user,
 133                                 $this->password,
 134                                 $this->server,
 135                                 $this->defaultCharset,
 136                                 $session_mode
 137                         );
 138                 } elseif ( $this->flags & DBO_DEFAULT ) {
 139                         $this->conn = oci_new_connect(
 140                                 $this->user,
 141                                 $this->password,
 142                                 $this->server,
 143                                 $this->defaultCharset,
 144                                 $session_mode
 145                         );
 146                 } else {
 147                         $this->conn = oci_connect(
 148                                 $this->user,
 149                                 $this->password,
 150                                 $this->server,
 151                                 $this->defaultCharset,
 152                                 $session_mode
 153                         );
 154                 }
 155                 Wikimedia\restoreWarnings();
 156
 157                 if ( $this->user != $realDatabase ) {
 158                         // change current schema in session
 159                         $this->selectDB( $realDatabase );
 160                 } else {
 161                         $this->currentDomain = new DatabaseDomain(
 162                                 $realDatabase,
 163                                 null,
 164                                 $tablePrefix
 165                         );
 166                 }
 167
 168                 if ( !$this->conn ) {
 169                         throw new DBConnectionError( $this, $this->lastError() );
 170                 }
 171
 172                 # removed putenv calls because they interfere with the system globaly
 173                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 174                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 175                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 176
 177                 return (bool)$this->conn;
 178         }
 179
 180         /**
 181          * Closes a database connection, if it is open
 182          * Returns success, true if already closed
 183          * @return bool
 184          */
 185         protected function closeConnection() {
 186                 return oci_close( $this->conn );
 187         }
 188
 189         function execFlags() {
 190                 return $this->trxLevel() ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 191         }
 192
 193         /**
 194          * @param string $sql
 195          * @return bool|mixed|ORAResult
 196          */
 197         protected function doQuery( $sql ) {
 198                 if ( !mb_check_encoding( (string)$sql, 'UTF-8' ) ) {
 199                         throw new DBUnexpectedError( $this, "SQL encoding is invalid\n$sql" );
 200                 }
 201
 202                 // handle some oracle specifics
 203                 // remove AS column/table/subquery namings
 204                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 205                         $sql = preg_replace( '/ as /i', ' ', $sql );
 206                 }
 207
 208                 // Oracle has issues with UNION clause if the statement includes LOB fields
 209                 // So we do a UNION ALL and then filter the results array with array_unique
 210                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 211                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 212                 // you have to select data from plan table after explain
 213                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 214
 215                 $sql = preg_replace(
 216                         '/^EXPLAIN /',
 217                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 218                         $sql,
 219                         1,
 220                         $explain_count
 221                 );
 222
 223                 Wikimedia\suppressWarnings();
 224
 225                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 226                 if ( $stmt === false ) {
 227                         $e = oci_error( $this->conn );
 228                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 229
 230                         return false;
 231                 }
 232
 233                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 234                         $e = oci_error( $stmt );
 235                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 236                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 237
 238                                 return false;
 239                         }
 240                 }
 241
 242                 Wikimedia\restoreWarnings();
 243
 244                 if ( $explain_count > 0 ) {
 245                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 246                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 247                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 248                         return new ORAResult( $this, $stmt, $union_unique );
 249                 } else {
 250                         $this->mAffectedRows = oci_num_rows( $stmt );
 251
 252                         return true;
 253                 }
 254         }
 255
 256         function queryIgnore( $sql, $fname = '' ) {
 257                 return $this->query( $sql, $fname, true );
 258         }
 259
 260         /**
 261          * Frees resources associated with the LOB descriptor
 262          * @param IResultWrapper|ORAResult $res
 263          */
 264         function freeResult( $res ) {
 265                 ResultWrapper::unwrap( $res )->free();
 266         }
 267
 268         /**
 269          * @param IResultWrapper|ORAResult $res
 270          * @return stdClass|bool
 271          */
 272         function fetchObject( $res ) {
 273                 return ResultWrapper::unwrap( $res )->fetchObject();
 274         }
 275
 276         /**
 277          * @param IResultWrapper|ORAResult $res
 278          * @return stdClass|bool
 279          */
 280         function fetchRow( $res ) {
 281                 return ResultWrapper::unwrap( $res )->fetchRow();
 282         }
 283
 284         /**
 285          * @param IResultWrapper|ORAResult $res
 286          * @return int
 287          */
 288         function numRows( $res ) {
 289                 return ResultWrapper::unwrap( $res )->numRows();
 290         }
 291
 292         /**
 293          * @param IResultWrapper|ORAResult $res
 294          * @return int
 295          */
 296         function numFields( $res ) {
 297                 return ResultWrapper::unwrap( $res )->numFields();
 298         }
 299
 300         function fieldName( $stmt, $n ) {
 301                 return oci_field_name( $stmt, $n );
 302         }
 303
 304         function insertId() {
 305                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 306                 $row = $this->fetchRow( $res );
 307                 return is_null( $row[0] ) ? null : (int)$row[0];
 308         }
 309
 310         /**
 311          * @param mixed $res
 312          * @param int $row
 313          */
 314         function dataSeek( $res, $row ) {
 315                 if ( $res instanceof ORAResult ) {
 316                         $res->seek( $row );
 317                 } else {
 318                         ResultWrapper::unwrap( $res )->seek( $row );
 319                 }
 320         }
 321
 322         function lastError() {
 323                 if ( $this->conn === false ) {
 324                         $e = oci_error();
 325                 } else {
 326                         $e = oci_error( $this->conn );
 327                 }
 328
 329                 return $e['message'];
 330         }
 331
 332         function lastErrno() {
 333                 if ( $this->conn === false ) {
 334                         $e = oci_error();
 335                 } else {
 336                         $e = oci_error( $this->conn );
 337                 }
 338
 339                 return $e['code'];
 340         }
 341
 342         protected function fetchAffectedRowCount() {
 343                 return $this->mAffectedRows;
 344         }
 345
 346         /**
 347          * Returns information about an index
 348          * If errors are explicitly ignored, returns NULL on failure
 349          * @param string $table
 350          * @param string $index
 351          * @param string $fname
 352          * @return bool
 353          */
 354         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 355                 return false;
 356         }
 357
 358         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 359                 return false;
 360         }
 361
 362         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 363                 if ( !count( $a ) ) {
 364                         return true;
 365                 }
 366
 367                 if ( !is_array( $options ) ) {
 368                         $options = [ $options ];
 369                 }
 370
 371                 if ( in_array( 'IGNORE', $options ) ) {
 372                         $this->ignoreDupValOnIndex = true;
 373                 }
 374
 375                 if ( !is_array( reset( $a ) ) ) {
 376                         $a = [ $a ];
 377                 }
 378
 379                 foreach ( $a as &$row ) {
 380                         $this->insertOneRow( $table, $row, $fname );
 381                 }
 382
 383                 if ( in_array( 'IGNORE', $options ) ) {
 384                         $this->ignoreDupValOnIndex = false;
 385                 }
 386
 387                 return true;
 388         }
 389
 390         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 391                 $col_info = $this->fieldInfoMulti( $table, $col );
 392                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 393
 394                 $bind = '';
 395                 if ( is_numeric( $col ) ) {
 396                         $bind = $val;
 397                         $val = null;
 398
 399                         return $bind;
 400                 } elseif ( $includeCol ) {
 401                         $bind = "$col = ";
 402                 }
 403
 404                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 405                         $val = null;
 406                 }
 407
 408                 if ( $val === 'NULL' ) {
 409                         $val = null;
 410                 }
 411
 412                 if ( $val === null ) {
 413                         if (
 414                                 $col_info != false &&
 415                                 $col_info->isNullable() == 0 &&
 416                                 $col_info->defaultValue() != null
 417                         ) {
 418                                 $bind .= 'DEFAULT';
 419                         } else {
 420                                 $bind .= 'NULL';
 421                         }
 422                 } else {
 423                         $bind .= ':' . $col;
 424                 }
 425
 426                 return $bind;
 427         }
 428
 429         /**
 430          * @param string $table
 431          * @param array $row
 432          * @param string $fname
 433          * @return bool
 434          * @throws DBUnexpectedError
 435          */
 436         private function insertOneRow( $table, $row, $fname ) {
 437                 $table = $this->tableName( $table );
 438                 // "INSERT INTO tables (a, b, c)"
 439                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 440                 $sql .= " VALUES (";
 441
 442                 // for each value, append ":key"
 443                 $first = true;
 444                 foreach ( $row as $col => &$val ) {
 445                         if ( !$first ) {
 446                                 $sql .= ', ';
 447                         } else {
 448                                 $first = false;
 449                         }
 450                         if ( $this->isQuotedIdentifier( $val ) ) {
 451                                 $sql .= $this->removeIdentifierQuotes( $val );
 452                                 unset( $row[$col] );
 453                         } else {
 454                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 455                         }
 456                 }
 457                 $sql .= ')';
 458
 459                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 460                 if ( $stmt === false ) {
 461                         $e = oci_error( $this->conn );
 462                         $this->reportQueryError( $e['message'], $e['code'], $sql, $fname );
 463
 464                         return false;
 465                 }
 466                 foreach ( $row as $col => &$val ) {
 467                         $col_info = $this->fieldInfoMulti( $table, $col );
 468                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 469
 470                         if ( $val === null ) {
 471                                 // do nothing ... null was inserted in statement creation
 472                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 473                                 if ( is_object( $val ) ) {
 474                                         $val = $val->fetch();
 475                                 }
 476
 477                                 // backward compatibility
 478                                 if (
 479                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
 480                                         strtolower( $val ) == 'infinity'
 481                                 ) {
 482                                         $val = $this->getInfinity();
 483                                 }
 484
 485                                 $val = $this->getVerifiedUTF8( $val );
 486                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 487                                         $e = oci_error( $stmt );
 488                                         $this->reportQueryError( $e['message'], $e['code'], $sql, $fname );
 489
 490                                         return false;
 491                                 }
 492                         } else {
 493                                 /** @var OCI_Lob[] $lob */
 494                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 495                                 if ( $lob[$col] === false ) {
 496                                         $e = oci_error( $stmt );
 497                                         throw new DBUnexpectedError(
 498                                                 $this,
 499                                                 "Cannot create LOB descriptor: " . $e['message']
 500                                         );
 501                                 }
 502
 503                                 if ( is_object( $val ) ) {
 504                                         $val = $val->fetch();
 505                                 }
 506
 507                                 if ( $col_type == 'BLOB' ) {
 508                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 509                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 510                                 } else {
 511                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 512                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 513                                 }
 514                         }
 515                 }
 516
 517                 Wikimedia\suppressWarnings();
 518
 519                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 520                         $e = oci_error( $stmt );
 521                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 522                                 $this->reportQueryError( $e['message'], $e['code'], $sql, $fname );
 523
 524                                 return false;
 525                         } else {
 526                                 $this->mAffectedRows = oci_num_rows( $stmt );
 527                         }
 528                 } else {
 529                         $this->mAffectedRows = oci_num_rows( $stmt );
 530                 }
 531
 532                 Wikimedia\restoreWarnings();
 533
 534                 if ( isset( $lob ) ) {
 535                         foreach ( $lob as $lob_v ) {
 536                                 $lob_v->free();
 537                         }
 538                 }
 539
 540                 if ( !$this->trxLevel() ) {
 541                         oci_commit( $this->conn );
 542                 }
 543
 544                 return oci_free_statement( $stmt );
 545         }
 546
 547         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 548                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 549         ) {
 550                 $destTable = $this->tableName( $destTable );
 551
 552                 $sequenceData = $this->getSequenceData( $destTable );
 553                 if ( $sequenceData !== false &&
 554                         !isset( $varMap[$sequenceData['column']] )
 555                 ) {
 556                         $varMap[$sequenceData['column']] =
 557                                 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 558                 }
 559
 560                 // count-alias subselect fields to avoid abigious definition errors
 561                 $i = 0;
 562                 foreach ( $varMap as &$val ) {
 563                         $val .= ' field' . $i;
 564                         $i++;
 565                 }
 566
 567                 $selectSql = $this->selectSQLText(
 568                         $srcTable,
 569                         array_values( $varMap ),
 570                         $conds,
 571                         $fname,
 572                         $selectOptions,
 573                         $selectJoinConds
 574                 );
 575
 576                 $sql = "INSERT INTO $destTable (" .
 577                         implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 578
 579                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 580                         $this->ignoreDupValOnIndex = true;
 581                 }
 582
 583                 $this->query( $sql, $fname );
 584
 585                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 586                         $this->ignoreDupValOnIndex = false;
 587                 }
 588         }
 589
 590         public function upsert( $table, array $rows, $uniqueIndexes, array $set,
 591                 $fname = __METHOD__
 592         ) {
 593                 if ( $rows === [] ) {
 594                         return true; // nothing to do
 595                 }
 596
 597                 if ( !is_array( reset( $rows ) ) ) {
 598                         $rows = [ $rows ];
 599                 }
 600
 601                 $sequenceData = $this->getSequenceData( $table );
 602                 if ( $sequenceData !== false ) {
 603                         // add sequence column to each list of columns, when not set
 604                         foreach ( $rows as &$row ) {
 605                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 606                                         $row[$sequenceData['column']] =
 607                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 608                                                         $sequenceData['sequence'] . '\')' );
 609                                 }
 610                         }
 611                 }
 612
 613                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 614         }
 615
 616         public function tableName( $name, $format = 'quoted' ) {
 617                 // Replace reserved words with better ones
 618                 $name = $this->remappedTableName( $name );
 619
 620                 return strtoupper( parent::tableName( $name, $format ) );
 621         }
 622
 623         /**
 624          * @param string $name
 625          * @return string Value of $name or remapped name if $name is a reserved keyword
 626          */
 627         public function remappedTableName( $name ) {
 628                 return $this->keywordTableMap[$name] ?? $name;
 629         }
 630
 631         function tableNameInternal( $name ) {
 632                 $name = $this->tableName( $name );
 633
 634                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 635         }
 636
 637         /**
 638          * Return sequence_name if table has a sequence
 639          *
 640          * @param string $table
 641          * @return string[]|bool
 642          */
 643         private function getSequenceData( $table ) {
 644                 if ( $this->sequenceData == null ) {
 645                         $dbname = $this->currentDomain->getDatabase();
 646                         $prefix = $this->currentDomain->getTablePrefix();
 647                         // See https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm
 648                         $decodeArgs = [ 'atc.table_name' ]; // the switch
 649                         foreach ( $this->keywordTableMap as $reserved => $alternative ) {
 650                                 $search = strtoupper( $prefix . $alternative ); // case
 651                                 $replace = strtoupper( $prefix . $reserved ); // result
 652                                 $decodeArgs[] = $this->addQuotes( $search );
 653                                 $decodeArgs[] = $this->addQuotes( $replace );
 654                         }
 655                         $decodeArgs[] = [ 'atc.table_name' ]; // default
 656                         $decodeArgs = implode( ', ', $decodeArgs );
 657
 658                         $result = $this->doQuery(
 659                                 "SELECT lower(asq.sequence_name), lower(atc.table_name), lower(atc.column_name)
 660                                 FROM all_sequences asq, all_tab_columns atc
 661                                 WHERE decode({$decodeArgs}) || '_' ||
 662                                 atc.column_name || '_SEQ' = '{$prefix}' || asq.sequence_name
 663                                 AND asq.sequence_owner = upper('{$dbname}')
 664                                 AND atc.owner = upper('{$dbname}')"
 665                         );
 666
 667                         while ( ( $row = $result->fetchRow() ) !== false ) {
 668                                 $this->sequenceData[$row[1]] = [
 669                                         'sequence' => $row[0],
 670                                         'column' => $row[2]
 671                                 ];
 672                         }
 673                 }
 674                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 675
 676                 return $this->sequenceData[$table] ?? false;
 677         }
 678
 679         /**
 680          * Returns the size of a text field, or -1 for "unlimited"
 681          *
 682          * @param string $table
 683          * @param string $field
 684          * @return mixed
 685          */
 686         function textFieldSize( $table, $field ) {
 687                 $fieldInfoData = $this->fieldInfo( $table, $field );
 688
 689                 return $fieldInfoData->maxLength();
 690         }
 691
 692         function limitResult( $sql, $limit, $offset = false ) {
 693                 if ( $offset === false ) {
 694                         $offset = 0;
 695                 }
 696
 697                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 698         }
 699
 700         function encodeBlob( $b ) {
 701                 return new Blob( $b );
 702         }
 703
 704         function unionQueries( $sqls, $all ) {
 705                 $glue = ' UNION ALL ';
 706
 707                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 708                         'FROM (' . implode( $glue, $sqls ) . ')';
 709         }
 710
 711         function wasDeadlock() {
 712                 return $this->lastErrno() == 'OCI-00060';
 713         }
 714
 715         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 716                 $fname = __METHOD__
 717         ) {
 718                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 719                 $tablePrefix = $this->currentDomain->getTablePrefix();
 720
 721                 $newName = strtoupper( $newName );
 722                 $oldName = strtoupper( $oldName );
 723
 724                 $tabName = substr( $newName, strlen( $tablePrefix ) );
 725                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 726                 $newPrefix = strtoupper( $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->query( 'SET CONSTRAINTS ALL DEFERRED' );
 935         }
 936
 937         protected function doCommit( $fname = __METHOD__ ) {
 938                 if ( $this->trxLevel() ) {
 939                         $ret = oci_commit( $this->conn );
 940                         if ( !$ret ) {
 941                                 throw new DBUnexpectedError( $this, $this->lastError() );
 942                         }
 943                         $this->query( 'SET CONSTRAINTS ALL IMMEDIATE' );
 944                 }
 945         }
 946
 947         protected function doRollback( $fname = __METHOD__ ) {
 948                 if ( $this->trxLevel() ) {
 949                         oci_rollback( $this->conn );
 950                         $ignoreErrors = true;
 951                         $this->query( 'SET CONSTRAINTS ALL IMMEDIATE', $fname, $ignoreErrors );
 952                 }
 953         }
 954
 955         function sourceStream(
 956                 $fp,
 957                 callable $lineCallback = null,
 958                 callable $resultCallback = null,
 959                 $fname = __METHOD__, callable $inputCallback = null
 960         ) {
 961                 $cmd = '';
 962                 $done = false;
 963                 $dollarquote = false;
 964
 965                 $replacements = [];
 966                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 967                 while ( !feof( $fp ) ) {
 968                         if ( $lineCallback ) {
 969                                 $lineCallback();
 970                         }
 971                         $line = trim( fgets( $fp, 1024 ) );
 972                         $sl = strlen( $line ) - 1;
 973
 974                         if ( $sl < 0 ) {
 975                                 continue;
 976                         }
 977                         if ( $line[0] == '-' && $line[1] == '-' ) {
 978                                 continue;
 979                         }
 980
 981                         // Allow dollar quoting for function declarations
 982                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 983                                 if ( $dollarquote ) {
 984                                         $dollarquote = false;
 985                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 986                                         $done = true;
 987                                 } else {
 988                                         $dollarquote = true;
 989                                 }
 990                         } elseif ( !$dollarquote ) {
 991                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
 992                                         $done = true;
 993                                         $line = substr( $line, 0, $sl );
 994                                 }
 995                         }
 996
 997                         if ( $cmd != '' ) {
 998                                 $cmd .= ' ';
 999                         }
1000                         $cmd .= "$line\n";
1001
1002                         if ( $done ) {
1003                                 $cmd = str_replace( ';;', ";", $cmd );
1004                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1005                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1006                                                 $replacements[$defines[2]] = $defines[1];
1007                                         }
1008                                 } else {
1009                                         foreach ( $replacements as $mwVar => $scVar ) {
1010                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1011                                         }
1012
1013                                         $cmd = $this->replaceVars( $cmd );
1014                                         if ( $inputCallback ) {
1015                                                 $inputCallback( $cmd );
1016                                         }
1017                                         $res = $this->doQuery( $cmd );
1018                                         if ( $resultCallback ) {
1019                                                 call_user_func( $resultCallback, $res, $this );
1020                                         }
1021
1022                                         if ( $res === false ) {
1023                                                 $err = $this->lastError();
1024
1025                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1026                                         }
1027                                 }
1028
1029                                 $cmd = '';
1030                                 $done = false;
1031                         }
1032                 }
1033
1034                 return true;
1035         }
1036
1037         protected function doSelectDomain( DatabaseDomain $domain ) {
1038                 if ( $domain->getSchema() !== null ) {
1039                         // We use the *database* aspect of $domain for schema, not the domain schema
1040                         throw new DBExpectedError(
1041                                 $this,
1042                                 __CLASS__ . ": domain '{$domain->getId()}' has a schema component; " .
1043                                 "the database component is actually interpreted as the Oracle schema."
1044                         );
1045                 }
1046
1047                 $database = $domain->getDatabase();
1048                 if ( $database === null || $database === $this->user ) {
1049                         // Backward compatibility
1050                         $this->currentDomain = $domain;
1051
1052                         return true;
1053                 }
1054
1055                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1056                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1057                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1058                 $stmt = oci_parse( $this->conn, $sql );
1059                 Wikimedia\suppressWarnings();
1060                 $success = oci_execute( $stmt );
1061                 Wikimedia\restoreWarnings();
1062                 if ( $success ) {
1063                         // Update that domain fields on success (no exception thrown)
1064                         $this->currentDomain = $domain;
1065                 } else {
1066                         $e = oci_error( $stmt );
1067                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1068                 }
1069
1070                 return true;
1071         }
1072
1073         function strencode( $s ) {
1074                 return str_replace( "'", "''", $s );
1075         }
1076
1077         function addQuotes( $s ) {
1078                 return "'" . $this->strencode( $this->getVerifiedUTF8( $s ) ) . "'";
1079         }
1080
1081         public function addIdentifierQuotes( $s ) {
1082                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1083                         $s = '/*Q*/' . $s;
1084                 }
1085
1086                 return $s;
1087         }
1088
1089         public function removeIdentifierQuotes( $s ) {
1090                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1091         }
1092
1093         public function isQuotedIdentifier( $s ) {
1094                 return strpos( $s, '/*Q*/' ) !== false;
1095         }
1096
1097         private function wrapFieldForWhere( $table, &$col, &$val ) {
1098                 $col_info = $this->fieldInfoMulti( $table, $col );
1099                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1100                 if ( $col_type == 'CLOB' ) {
1101                         $col = 'TO_CHAR(' . $col . ')';
1102                         $val = $this->getVerifiedUTF8( $val );
1103                 } elseif ( $col_type == 'VARCHAR2' ) {
1104                         $val = $this->getVerifiedUTF8( $val );
1105                 }
1106         }
1107
1108         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1109                 $conds2 = [];
1110                 foreach ( $conds as $col => $val ) {
1111                         if ( is_array( $val ) ) {
1112                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1113                         } else {
1114                                 if ( is_numeric( $col ) && $parentCol != null ) {
1115                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1116                                 } else {
1117                                         $this->wrapFieldForWhere( $table, $col, $val );
1118                                 }
1119                                 $conds2[$col] = $val;
1120                         }
1121                 }
1122
1123                 return $conds2;
1124         }
1125
1126         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1127                 $options = [], $join_conds = []
1128         ) {
1129                 if ( is_array( $conds ) ) {
1130                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1131                 }
1132
1133                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1134         }
1135
1136         /**
1137          * Returns an optional USE INDEX clause to go after the table, and a
1138          * string to go at the end of the query
1139          *
1140          * @param array $options An associative array of options to be turned into
1141          *   an SQL query, valid keys are listed in the function.
1142          * @return array
1143          */
1144         function makeSelectOptions( $options ) {
1145                 $preLimitTail = $postLimitTail = '';
1146                 $startOpts = '';
1147
1148                 $noKeyOptions = [];
1149                 foreach ( $options as $key => $option ) {
1150                         if ( is_numeric( $key ) ) {
1151                                 $noKeyOptions[$option] = true;
1152                         }
1153                 }
1154
1155                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1156
1157                 $preLimitTail .= $this->makeOrderBy( $options );
1158
1159                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1160                         $postLimitTail .= ' FOR UPDATE';
1161                 }
1162
1163                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1164                         $startOpts .= 'DISTINCT';
1165                 }
1166
1167                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1168                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1169                 } else {
1170                         $useIndex = '';
1171                 }
1172
1173                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1174                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1175                 } else {
1176                         $ignoreIndex = '';
1177                 }
1178
1179                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1180         }
1181
1182         public function delete( $table, $conds, $fname = __METHOD__ ) {
1183                 global $wgActorTableSchemaMigrationStage;
1184
1185                 if ( is_array( $conds ) ) {
1186                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1187                 }
1188                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1189                 // all deletions on these tables have transactions so final failure rollbacks these updates
1190                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1191                 $table = $this->tableName( $table );
1192                 if ( $table == $this->tableName( 'user' ) &&
1193                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1194                 ) {
1195                         $this->update( 'archive', [ 'ar_user' => 0 ],
1196                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1197                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1198                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1199                         $this->update( 'image', [ 'img_user' => 0 ],
1200                                 [ 'img_user' => $conds['user_id'] ], $fname );
1201                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1202                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1203                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1204                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1205                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1206                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1207                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1208                                 [ 'us_user' => $conds['user_id'] ], $fname );
1209                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1210                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1211                         $this->update( 'logging', [ 'log_user' => 0 ],
1212                                 [ 'log_user' => $conds['user_id'] ], $fname );
1213                 } elseif ( $table == $this->tableName( 'image' ) ) {
1214                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1215                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1216                 }
1217
1218                 return parent::delete( $table, $conds, $fname );
1219         }
1220
1221         /**
1222          * @param string $table
1223          * @param array $values
1224          * @param array $conds
1225          * @param string $fname
1226          * @param array $options
1227          * @return bool
1228          * @throws DBUnexpectedError
1229          */
1230         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1231                 $table = $this->tableName( $table );
1232                 $opts = $this->makeUpdateOptions( $options );
1233                 $sql = "UPDATE $opts $table SET ";
1234
1235                 $first = true;
1236                 foreach ( $values as $col => &$val ) {
1237                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1238
1239                         if ( !$first ) {
1240                                 $sqlSet = ', ' . $sqlSet;
1241                         } else {
1242                                 $first = false;
1243                         }
1244                         $sql .= $sqlSet;
1245                 }
1246
1247                 if ( $conds !== [] && $conds !== '*' ) {
1248                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1249                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1250                 }
1251
1252                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1253                 if ( $stmt === false ) {
1254                         $e = oci_error( $this->conn );
1255                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1256
1257                         return false;
1258                 }
1259                 foreach ( $values as $col => &$val ) {
1260                         $col_info = $this->fieldInfoMulti( $table, $col );
1261                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1262
1263                         if ( $val === null ) {
1264                                 // do nothing ... null was inserted in statement creation
1265                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1266                                 if ( is_object( $val ) ) {
1267                                         $val = $val->getData();
1268                                 }
1269
1270                                 if (
1271                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
1272                                         strtolower( $val ) == 'infinity'
1273                                 ) {
1274                                         $val = '31-12-2030 12:00:00.000000';
1275                                 }
1276
1277                                 $val = $this->getVerifiedUTF8( $val );
1278                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1279                                         $e = oci_error( $stmt );
1280                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1281
1282                                         return false;
1283                                 }
1284                         } else {
1285                                 /** @var OCI_Lob[] $lob */
1286                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1287                                 if ( $lob[$col] === false ) {
1288                                         $e = oci_error( $stmt );
1289                                         throw new DBUnexpectedError(
1290                                                 $this,
1291                                                 "Cannot create LOB descriptor: " . $e['message']
1292                                         );
1293                                 }
1294
1295                                 if ( is_object( $val ) ) {
1296                                         $val = $val->getData();
1297                                 }
1298
1299                                 if ( $col_type == 'BLOB' ) {
1300                                         $lob[$col]->writeTemporary( $val );
1301                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1302                                 } else {
1303                                         $lob[$col]->writeTemporary( $val );
1304                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1305                                 }
1306                         }
1307                 }
1308
1309                 Wikimedia\suppressWarnings();
1310
1311                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1312                         $e = oci_error( $stmt );
1313                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1314                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1315
1316                                 return false;
1317                         } else {
1318                                 $this->mAffectedRows = oci_num_rows( $stmt );
1319                         }
1320                 } else {
1321                         $this->mAffectedRows = oci_num_rows( $stmt );
1322                 }
1323
1324                 Wikimedia\restoreWarnings();
1325
1326                 if ( isset( $lob ) ) {
1327                         foreach ( $lob as $lob_v ) {
1328                                 $lob_v->free();
1329                         }
1330                 }
1331
1332                 if ( !$this->trxLevel() ) {
1333                         oci_commit( $this->conn );
1334                 }
1335
1336                 return oci_free_statement( $stmt );
1337         }
1338
1339         function bitNot( $field ) {
1340                 // expecting bit-fields smaller than 4bytes
1341                 return 'BITNOT(' . $field . ')';
1342         }
1343
1344         function bitAnd( $fieldLeft, $fieldRight ) {
1345                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1346         }
1347
1348         function bitOr( $fieldLeft, $fieldRight ) {
1349                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1350         }
1351
1352         public function buildGroupConcatField(
1353                 $delim, $table, $field, $conds = '', $join_conds = []
1354         ) {
1355                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1356
1357                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1358         }
1359
1360         public function buildSubstring( $input, $startPosition, $length = null ) {
1361                 $this->assertBuildSubstringParams( $startPosition, $length );
1362                 $params = [ $input, $startPosition ];
1363                 if ( $length !== null ) {
1364                         $params[] = $length;
1365                 }
1366                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1367         }
1368
1369         /**
1370          * @param string $field Field or column to cast
1371          * @return string
1372          * @since 1.28
1373          */
1374         public function buildStringCast( $field ) {
1375                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1376         }
1377
1378         public function getInfinity() {
1379                 return '31-12-2030 12:00:00.000000';
1380         }
1381
1382         /**
1383          * @param string $s
1384          * @return string
1385          */
1386         private function getVerifiedUTF8( $s ) {
1387                 if ( mb_check_encoding( (string)$s, 'UTF-8' ) ) {
1388                         return $s; // valid
1389                 }
1390
1391                 throw new DBUnexpectedError( $this, "Non BLOB/CLOB field must be UTF-8." );
1392         }
1393 }