includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 use Wikimedia\Timestamp\ConvertibleTimestamp;
  25 use Wikimedia\Rdbms\Database;
  26 use Wikimedia\Rdbms\DatabaseDomain;
  27 use Wikimedia\Rdbms\Blob;
  28 use Wikimedia\Rdbms\ResultWrapper;
  29 use Wikimedia\Rdbms\DBConnectionError;
  30 use Wikimedia\Rdbms\DBUnexpectedError;
  31 use Wikimedia\Rdbms\DBExpectedError;
  32
  33 /**
  34  * @ingroup Database
  35  */
  36 class DatabaseOracle extends Database {
  37         /** @var resource */
  38         protected $mLastResult = null;
  39
  40         /** @var int The number of rows affected as an integer */
  41         protected $mAffectedRows;
  42
  43         /** @var bool */
  44         private $ignoreDupValOnIndex = false;
  45
  46         /** @var bool|array */
  47         private $sequenceData = null;
  48
  49         /** @var string Character set for Oracle database */
  50         private $defaultCharset = 'AL32UTF8';
  51
  52         /** @var array */
  53         private $mFieldInfoCache = [];
  54
  55         /** @var string[] Map of (reserved table name => alternate table name) */
  56         private $keywordTableMap = [];
  57
  58         /**
  59          * @see Database::__construct()
  60          * @param array $params Additional parameters include:
  61          *   - keywordTableMap : Map of reserved table names to alternative table names to use
  62          */
  63         function __construct( array $params ) {
  64                 $this->keywordTableMap = $params['keywordTableMap'] ?? [];
  65                 $params['tablePrefix'] = strtoupper( $params['tablePrefix'] );
  66                 parent::__construct( $params );
  67         }
  68
  69         function __destruct() {
  70                 if ( $this->opened ) {
  71                         Wikimedia\suppressWarnings();
  72                         $this->close();
  73                         Wikimedia\restoreWarnings();
  74                 }
  75         }
  76
  77         function getType() {
  78                 return 'oracle';
  79         }
  80
  81         function implicitGroupby() {
  82                 return false;
  83         }
  84
  85         function implicitOrderby() {
  86                 return false;
  87         }
  88
  89         protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
  90                 if ( !function_exists( 'oci_connect' ) ) {
  91                         throw new DBConnectionError(
  92                                 $this,
  93                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  94                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  95                                         "and database)\n" );
  96                 }
  97
  98                 $this->close();
  99                 $this->user = $user;
 100                 $this->password = $password;
 101                 if ( !$server ) {
 102                         // Backward compatibility (server used to be null and TNS was supplied in dbname)
 103                         $this->server = $dbName;
 104                         $realDatabase = $user;
 105                 } else {
 106                         // $server now holds the TNS endpoint
 107                         $this->server = $server;
 108                         // $dbName is schema name if different from username
 109                         $realDatabase = $dbName ?: $user;
 110                 }
 111
 112                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 113                         return null;
 114                 }
 115
 116                 $session_mode = ( $this->flags & DBO_SYSDBA ) ? OCI_SYSDBA : OCI_DEFAULT;
 117
 118                 Wikimedia\suppressWarnings();
 119                 if ( $this->flags & DBO_PERSISTENT ) {
 120                         $this->conn = oci_pconnect(
 121                                 $this->user,
 122                                 $this->password,
 123                                 $this->server,
 124                                 $this->defaultCharset,
 125                                 $session_mode
 126                         );
 127                 } elseif ( $this->flags & DBO_DEFAULT ) {
 128                         $this->conn = oci_new_connect(
 129                                 $this->user,
 130                                 $this->password,
 131                                 $this->server,
 132                                 $this->defaultCharset,
 133                                 $session_mode
 134                         );
 135                 } else {
 136                         $this->conn = oci_connect(
 137                                 $this->user,
 138                                 $this->password,
 139                                 $this->server,
 140                                 $this->defaultCharset,
 141                                 $session_mode
 142                         );
 143                 }
 144                 Wikimedia\restoreWarnings();
 145
 146                 if ( $this->user != $realDatabase ) {
 147                         // change current schema in session
 148                         $this->selectDB( $realDatabase );
 149                 } else {
 150                         $this->currentDomain = new DatabaseDomain(
 151                                 $realDatabase,
 152                                 null,
 153                                 $tablePrefix
 154                         );
 155                 }
 156
 157                 if ( !$this->conn ) {
 158                         throw new DBConnectionError( $this, $this->lastError() );
 159                 }
 160
 161                 $this->opened = true;
 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 ResultWrapper|ORAResult $res
 254          */
 255         function freeResult( $res ) {
 256                 if ( $res instanceof ResultWrapper ) {
 257                         $res = $res->result;
 258                 }
 259
 260                 $res->free();
 261         }
 262
 263         /**
 264          * @param ResultWrapper|ORAResult $res
 265          * @return mixed
 266          */
 267         function fetchObject( $res ) {
 268                 if ( $res instanceof ResultWrapper ) {
 269                         $res = $res->result;
 270                 }
 271
 272                 return $res->fetchObject();
 273         }
 274
 275         /**
 276          * @param ResultWrapper|ORAResult $res
 277          * @return mixed
 278          */
 279         function fetchRow( $res ) {
 280                 if ( $res instanceof ResultWrapper ) {
 281                         $res = $res->result;
 282                 }
 283
 284                 return $res->fetchRow();
 285         }
 286
 287         /**
 288          * @param ResultWrapper|ORAResult $res
 289          * @return int
 290          */
 291         function numRows( $res ) {
 292                 if ( $res instanceof ResultWrapper ) {
 293                         $res = $res->result;
 294                 }
 295
 296                 return $res->numRows();
 297         }
 298
 299         /**
 300          * @param ResultWrapper|ORAResult $res
 301          * @return int
 302          */
 303         function numFields( $res ) {
 304                 if ( $res instanceof ResultWrapper ) {
 305                         $res = $res->result;
 306                 }
 307
 308                 return $res->numFields();
 309         }
 310
 311         function fieldName( $stmt, $n ) {
 312                 return oci_field_name( $stmt, $n );
 313         }
 314
 315         function insertId() {
 316                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 317                 $row = $this->fetchRow( $res );
 318                 return is_null( $row[0] ) ? null : (int)$row[0];
 319         }
 320
 321         /**
 322          * @param mixed $res
 323          * @param int $row
 324          */
 325         function dataSeek( $res, $row ) {
 326                 if ( $res instanceof ORAResult ) {
 327                         $res->seek( $row );
 328                 } else {
 329                         $res->result->seek( $row );
 330                 }
 331         }
 332
 333         function lastError() {
 334                 if ( $this->conn === false ) {
 335                         $e = oci_error();
 336                 } else {
 337                         $e = oci_error( $this->conn );
 338                 }
 339
 340                 return $e['message'];
 341         }
 342
 343         function lastErrno() {
 344                 if ( $this->conn === false ) {
 345                         $e = oci_error();
 346                 } else {
 347                         $e = oci_error( $this->conn );
 348                 }
 349
 350                 return $e['code'];
 351         }
 352
 353         protected function fetchAffectedRowCount() {
 354                 return $this->mAffectedRows;
 355         }
 356
 357         /**
 358          * Returns information about an index
 359          * If errors are explicitly ignored, returns NULL on failure
 360          * @param string $table
 361          * @param string $index
 362          * @param string $fname
 363          * @return bool
 364          */
 365         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 366                 return false;
 367         }
 368
 369         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 370                 return false;
 371         }
 372
 373         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 374                 if ( !count( $a ) ) {
 375                         return true;
 376                 }
 377
 378                 if ( !is_array( $options ) ) {
 379                         $options = [ $options ];
 380                 }
 381
 382                 if ( in_array( 'IGNORE', $options ) ) {
 383                         $this->ignoreDupValOnIndex = true;
 384                 }
 385
 386                 if ( !is_array( reset( $a ) ) ) {
 387                         $a = [ $a ];
 388                 }
 389
 390                 foreach ( $a as &$row ) {
 391                         $this->insertOneRow( $table, $row, $fname );
 392                 }
 393
 394                 if ( in_array( 'IGNORE', $options ) ) {
 395                         $this->ignoreDupValOnIndex = false;
 396                 }
 397
 398                 return true;
 399         }
 400
 401         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 402                 $col_info = $this->fieldInfoMulti( $table, $col );
 403                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 404
 405                 $bind = '';
 406                 if ( is_numeric( $col ) ) {
 407                         $bind = $val;
 408                         $val = null;
 409
 410                         return $bind;
 411                 } elseif ( $includeCol ) {
 412                         $bind = "$col = ";
 413                 }
 414
 415                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 416                         $val = null;
 417                 }
 418
 419                 if ( $val === 'NULL' ) {
 420                         $val = null;
 421                 }
 422
 423                 if ( $val === null ) {
 424                         if (
 425                                 $col_info != false &&
 426                                 $col_info->isNullable() == 0 &&
 427                                 $col_info->defaultValue() != null
 428                         ) {
 429                                 $bind .= 'DEFAULT';
 430                         } else {
 431                                 $bind .= 'NULL';
 432                         }
 433                 } else {
 434                         $bind .= ':' . $col;
 435                 }
 436
 437                 return $bind;
 438         }
 439
 440         /**
 441          * @param string $table
 442          * @param array $row
 443          * @param string $fname
 444          * @return bool
 445          * @throws DBUnexpectedError
 446          */
 447         private function insertOneRow( $table, $row, $fname ) {
 448                 $table = $this->tableName( $table );
 449                 // "INSERT INTO tables (a, b, c)"
 450                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 451                 $sql .= " VALUES (";
 452
 453                 // for each value, append ":key"
 454                 $first = true;
 455                 foreach ( $row as $col => &$val ) {
 456                         if ( !$first ) {
 457                                 $sql .= ', ';
 458                         } else {
 459                                 $first = false;
 460                         }
 461                         if ( $this->isQuotedIdentifier( $val ) ) {
 462                                 $sql .= $this->removeIdentifierQuotes( $val );
 463                                 unset( $row[$col] );
 464                         } else {
 465                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 466                         }
 467                 }
 468                 $sql .= ')';
 469
 470                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 471                 if ( $stmt === false ) {
 472                         $e = oci_error( $this->conn );
 473                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 474
 475                         return false;
 476                 }
 477                 foreach ( $row as $col => &$val ) {
 478                         $col_info = $this->fieldInfoMulti( $table, $col );
 479                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 480
 481                         if ( $val === null ) {
 482                                 // do nothing ... null was inserted in statement creation
 483                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 484                                 if ( is_object( $val ) ) {
 485                                         $val = $val->fetch();
 486                                 }
 487
 488                                 // backward compatibility
 489                                 if (
 490                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
 491                                         strtolower( $val ) == 'infinity'
 492                                 ) {
 493                                         $val = $this->getInfinity();
 494                                 }
 495
 496                                 $val = $this->getVerifiedUTF8( $val );
 497                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 498                                         $e = oci_error( $stmt );
 499                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 500
 501                                         return false;
 502                                 }
 503                         } else {
 504                                 /** @var OCI_Lob[] $lob */
 505                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 506                                 if ( $lob[$col] === false ) {
 507                                         $e = oci_error( $stmt );
 508                                         throw new DBUnexpectedError(
 509                                                 $this,
 510                                                 "Cannot create LOB descriptor: " . $e['message']
 511                                         );
 512                                 }
 513
 514                                 if ( is_object( $val ) ) {
 515                                         $val = $val->fetch();
 516                                 }
 517
 518                                 if ( $col_type == 'BLOB' ) {
 519                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 520                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 521                                 } else {
 522                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 523                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 524                                 }
 525                         }
 526                 }
 527
 528                 Wikimedia\suppressWarnings();
 529
 530                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 531                         $e = oci_error( $stmt );
 532                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 533                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 534
 535                                 return false;
 536                         } else {
 537                                 $this->mAffectedRows = oci_num_rows( $stmt );
 538                         }
 539                 } else {
 540                         $this->mAffectedRows = oci_num_rows( $stmt );
 541                 }
 542
 543                 Wikimedia\restoreWarnings();
 544
 545                 if ( isset( $lob ) ) {
 546                         foreach ( $lob as $lob_v ) {
 547                                 $lob_v->free();
 548                         }
 549                 }
 550
 551                 if ( !$this->trxLevel ) {
 552                         oci_commit( $this->conn );
 553                 }
 554
 555                 return oci_free_statement( $stmt );
 556         }
 557
 558         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 559                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 560         ) {
 561                 $destTable = $this->tableName( $destTable );
 562
 563                 $sequenceData = $this->getSequenceData( $destTable );
 564                 if ( $sequenceData !== false &&
 565                         !isset( $varMap[$sequenceData['column']] )
 566                 ) {
 567                         $varMap[$sequenceData['column']] =
 568                                 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 569                 }
 570
 571                 // count-alias subselect fields to avoid abigious definition errors
 572                 $i = 0;
 573                 foreach ( $varMap as &$val ) {
 574                         $val .= ' field' . $i;
 575                         $i++;
 576                 }
 577
 578                 $selectSql = $this->selectSQLText(
 579                         $srcTable,
 580                         array_values( $varMap ),
 581                         $conds,
 582                         $fname,
 583                         $selectOptions,
 584                         $selectJoinConds
 585                 );
 586
 587                 $sql = "INSERT INTO $destTable (" .
 588                         implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 589
 590                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 591                         $this->ignoreDupValOnIndex = true;
 592                 }
 593
 594                 $this->query( $sql, $fname );
 595
 596                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 597                         $this->ignoreDupValOnIndex = false;
 598                 }
 599         }
 600
 601         public function upsert( $table, array $rows, $uniqueIndexes, array $set,
 602                 $fname = __METHOD__
 603         ) {
 604                 if ( $rows === [] ) {
 605                         return true; // nothing to do
 606                 }
 607
 608                 if ( !is_array( reset( $rows ) ) ) {
 609                         $rows = [ $rows ];
 610                 }
 611
 612                 $sequenceData = $this->getSequenceData( $table );
 613                 if ( $sequenceData !== false ) {
 614                         // add sequence column to each list of columns, when not set
 615                         foreach ( $rows as &$row ) {
 616                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 617                                         $row[$sequenceData['column']] =
 618                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 619                                                         $sequenceData['sequence'] . '\')' );
 620                                 }
 621                         }
 622                 }
 623
 624                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 625         }
 626
 627         public function tableName( $name, $format = 'quoted' ) {
 628                 // Replace reserved words with better ones
 629                 $name = $this->remappedTableName( $name );
 630
 631                 return strtoupper( parent::tableName( $name, $format ) );
 632         }
 633
 634         /**
 635          * @param string $name
 636          * @return string Value of $name or remapped name if $name is a reserved keyword
 637          */
 638         public function remappedTableName( $name ) {
 639                 return $this->keywordTableMap[$name] ?? $name;
 640         }
 641
 642         function tableNameInternal( $name ) {
 643                 $name = $this->tableName( $name );
 644
 645                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 646         }
 647
 648         /**
 649          * Return sequence_name if table has a sequence
 650          *
 651          * @param string $table
 652          * @return string[]|bool
 653          */
 654         private function getSequenceData( $table ) {
 655                 if ( $this->sequenceData == null ) {
 656                         $dbname = $this->currentDomain->getDatabase();
 657                         $prefix = $this->currentDomain->getTablePrefix();
 658                         // See https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm
 659                         $decodeArgs = [ 'atc.table_name' ]; // the switch
 660                         foreach ( $this->keywordTableMap as $reserved => $alternative ) {
 661                                 $search = strtoupper( $prefix . $alternative ); // case
 662                                 $replace = strtoupper( $prefix . $reserved ); // result
 663                                 $decodeArgs[] = $this->addQuotes( $search );
 664                                 $decodeArgs[] = $this->addQuotes( $replace );
 665                         }
 666                         $decodeArgs[] = [ 'atc.table_name' ]; // default
 667                         $decodeArgs = implode( ', ', $decodeArgs );
 668
 669                         $result = $this->doQuery(
 670                                 "SELECT lower(asq.sequence_name), lower(atc.table_name), lower(atc.column_name)
 671                                 FROM all_sequences asq, all_tab_columns atc
 672                                 WHERE decode({$decodeArgs}) || '_' ||
 673                                 atc.column_name || '_SEQ' = '{$prefix}' || asq.sequence_name
 674                                 AND asq.sequence_owner = upper('{$dbname}')
 675                                 AND atc.owner = upper('{$dbname}')"
 676                         );
 677
 678                         while ( ( $row = $result->fetchRow() ) !== false ) {
 679                                 $this->sequenceData[$row[1]] = [
 680                                         'sequence' => $row[0],
 681                                         'column' => $row[2]
 682                                 ];
 683                         }
 684                 }
 685                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 686
 687                 return $this->sequenceData[$table] ?? false;
 688         }
 689
 690         /**
 691          * Returns the size of a text field, or -1 for "unlimited"
 692          *
 693          * @param string $table
 694          * @param string $field
 695          * @return mixed
 696          */
 697         function textFieldSize( $table, $field ) {
 698                 $fieldInfoData = $this->fieldInfo( $table, $field );
 699
 700                 return $fieldInfoData->maxLength();
 701         }
 702
 703         function limitResult( $sql, $limit, $offset = false ) {
 704                 if ( $offset === false ) {
 705                         $offset = 0;
 706                 }
 707
 708                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 709         }
 710
 711         function encodeBlob( $b ) {
 712                 return new Blob( $b );
 713         }
 714
 715         function unionQueries( $sqls, $all ) {
 716                 $glue = ' UNION ALL ';
 717
 718                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 719                         'FROM (' . implode( $glue, $sqls ) . ')';
 720         }
 721
 722         function wasDeadlock() {
 723                 return $this->lastErrno() == 'OCI-00060';
 724         }
 725
 726         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 727                 $fname = __METHOD__
 728         ) {
 729                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 730                 $tablePrefix = $this->currentDomain->getTablePrefix();
 731
 732                 $newName = strtoupper( $newName );
 733                 $oldName = strtoupper( $oldName );
 734
 735                 $tabName = substr( $newName, strlen( $tablePrefix ) );
 736                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 737                 $newPrefix = strtoupper( $tablePrefix );
 738
 739                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 740                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 741         }
 742
 743         function listTables( $prefix = null, $fname = __METHOD__ ) {
 744                 $listWhere = '';
 745                 if ( !empty( $prefix ) ) {
 746                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 747                 }
 748
 749                 $owner = strtoupper( $this->getDBname() );
 750                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 751                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 752
 753                 // dirty code ... i know
 754                 $endArray = [];
 755                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 756                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 757                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 758                 $fixedOrderTabs = $endArray;
 759                 while ( ( $row = $result->fetchRow() ) !== false ) {
 760                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 761                                 $endArray[] = $row['table_name'];
 762                         }
 763                 }
 764
 765                 return $endArray;
 766         }
 767
 768         public function dropTable( $tableName, $fName = __METHOD__ ) {
 769                 $tableName = $this->tableName( $tableName );
 770                 if ( !$this->tableExists( $tableName ) ) {
 771                         return false;
 772                 }
 773
 774                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 775         }
 776
 777         public function timestamp( $ts = 0 ) {
 778                 $t = new ConvertibleTimestamp( $ts );
 779                 // Let errors bubble up to avoid putting garbage in the DB
 780                 return $t->getTimestamp( TS_ORACLE );
 781         }
 782
 783         /**
 784          * Return aggregated value function call
 785          *
 786          * @param array $valuedata
 787          * @param string $valuename
 788          * @return mixed
 789          */
 790         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 791                 return $valuedata;
 792         }
 793
 794         /**
 795          * @return string Wikitext of a link to the server software's web site
 796          */
 797         public function getSoftwareLink() {
 798                 return '[{{int:version-db-oracle-url}} Oracle]';
 799         }
 800
 801         /**
 802          * @return string Version information from the database
 803          */
 804         function getServerVersion() {
 805                 // better version number, fallback on driver
 806                 $rset = $this->doQuery(
 807                         'SELECT version FROM product_component_version ' .
 808                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 809                 );
 810                 $row = $rset->fetchRow();
 811                 if ( !$row ) {
 812                         return oci_server_version( $this->conn );
 813                 }
 814
 815                 return $row['version'];
 816         }
 817
 818         /**
 819          * Query whether a given index exists
 820          * @param string $table
 821          * @param string $index
 822          * @param string $fname
 823          * @return bool
 824          */
 825         function indexExists( $table, $index, $fname = __METHOD__ ) {
 826                 $table = $this->tableName( $table );
 827                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 828                 $index = strtoupper( $index );
 829                 $owner = strtoupper( $this->getDBname() );
 830                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 831                 $res = $this->doQuery( $sql );
 832                 if ( $res ) {
 833                         $count = $res->numRows();
 834                         $res->free();
 835                 } else {
 836                         $count = 0;
 837                 }
 838
 839                 return $count != 0;
 840         }
 841
 842         /**
 843          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 844          * @param string $table
 845          * @param string $fname
 846          * @return bool
 847          */
 848         function tableExists( $table, $fname = __METHOD__ ) {
 849                 $table = $this->tableName( $table );
 850                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 851                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 852                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 853                 $res = $this->doQuery( $sql );
 854                 if ( $res && $res->numRows() > 0 ) {
 855                         $exists = true;
 856                 } else {
 857                         $exists = false;
 858                 }
 859
 860                 $res->free();
 861
 862                 return $exists;
 863         }
 864
 865         /**
 866          * Function translates mysql_fetch_field() functionality on ORACLE.
 867          * Caching is present for reducing query time.
 868          * For internal calls. Use fieldInfo for normal usage.
 869          * Returns false if the field doesn't exist
 870          *
 871          * @param array|string $table
 872          * @param string $field
 873          * @return ORAField|ORAResult|false
 874          */
 875         private function fieldInfoMulti( $table, $field ) {
 876                 $field = strtoupper( $field );
 877                 if ( is_array( $table ) ) {
 878                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 879                         $tableWhere = 'IN (';
 880                         foreach ( $table as &$singleTable ) {
 881                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 882                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 883                                         return $this->mFieldInfoCache["$singleTable.$field"];
 884                                 }
 885                                 $tableWhere .= '\'' . $singleTable . '\',';
 886                         }
 887                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 888                 } else {
 889                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 890                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 891                                 return $this->mFieldInfoCache["$table.$field"];
 892                         }
 893                         $tableWhere = '= \'' . $table . '\'';
 894                 }
 895
 896                 $fieldInfoStmt = oci_parse(
 897                         $this->conn,
 898                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 899                                 $tableWhere . ' and column_name = \'' . $field . '\''
 900                 );
 901                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 902                         $e = oci_error( $fieldInfoStmt );
 903                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 904
 905                         return false;
 906                 }
 907                 $res = new ORAResult( $this, $fieldInfoStmt );
 908                 if ( $res->numRows() == 0 ) {
 909                         if ( is_array( $table ) ) {
 910                                 foreach ( $table as &$singleTable ) {
 911                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 912                                 }
 913                         } else {
 914                                 $this->mFieldInfoCache["$table.$field"] = false;
 915                         }
 916                         $fieldInfoTemp = null;
 917                 } else {
 918                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 919                         $table = $fieldInfoTemp->tableName();
 920                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 921                 }
 922                 $res->free();
 923
 924                 return $fieldInfoTemp;
 925         }
 926
 927         /**
 928          * @throws DBUnexpectedError
 929          * @param string $table
 930          * @param string $field
 931          * @return ORAField
 932          */
 933         function fieldInfo( $table, $field ) {
 934                 if ( is_array( $table ) ) {
 935                         throw new DBUnexpectedError(
 936                                 $this,
 937                                 'DatabaseOracle::fieldInfo called with table array!'
 938                         );
 939                 }
 940
 941                 return $this->fieldInfoMulti( $table, $field );
 942         }
 943
 944         protected function doBegin( $fname = __METHOD__ ) {
 945                 $this->trxLevel = 1;
 946                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 947         }
 948
 949         protected function doCommit( $fname = __METHOD__ ) {
 950                 if ( $this->trxLevel ) {
 951                         $ret = oci_commit( $this->conn );
 952                         if ( !$ret ) {
 953                                 throw new DBUnexpectedError( $this, $this->lastError() );
 954                         }
 955                         $this->trxLevel = 0;
 956                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 957                 }
 958         }
 959
 960         protected function doRollback( $fname = __METHOD__ ) {
 961                 if ( $this->trxLevel ) {
 962                         oci_rollback( $this->conn );
 963                         $this->trxLevel = 0;
 964                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 965                 }
 966         }
 967
 968         function sourceStream(
 969                 $fp,
 970                 callable $lineCallback = null,
 971                 callable $resultCallback = null,
 972                 $fname = __METHOD__, callable $inputCallback = null
 973         ) {
 974                 $cmd = '';
 975                 $done = false;
 976                 $dollarquote = false;
 977
 978                 $replacements = [];
 979                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 980                 while ( !feof( $fp ) ) {
 981                         if ( $lineCallback ) {
 982                                 $lineCallback();
 983                         }
 984                         $line = trim( fgets( $fp, 1024 ) );
 985                         $sl = strlen( $line ) - 1;
 986
 987                         if ( $sl < 0 ) {
 988                                 continue;
 989                         }
 990                         if ( $line[0] == '-' && $line[1] == '-' ) {
 991                                 continue;
 992                         }
 993
 994                         // Allow dollar quoting for function declarations
 995                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 996                                 if ( $dollarquote ) {
 997                                         $dollarquote = false;
 998                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 999                                         $done = true;
1000                                 } else {
1001                                         $dollarquote = true;
1002                                 }
1003                         } elseif ( !$dollarquote ) {
1004                                 if ( $line[$sl] == ';' && ( $sl < 2 || $line[$sl - 1] != ';' ) ) {
1005                                         $done = true;
1006                                         $line = substr( $line, 0, $sl );
1007                                 }
1008                         }
1009
1010                         if ( $cmd != '' ) {
1011                                 $cmd .= ' ';
1012                         }
1013                         $cmd .= "$line\n";
1014
1015                         if ( $done ) {
1016                                 $cmd = str_replace( ';;', ";", $cmd );
1017                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1018                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1019                                                 $replacements[$defines[2]] = $defines[1];
1020                                         }
1021                                 } else {
1022                                         foreach ( $replacements as $mwVar => $scVar ) {
1023                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1024                                         }
1025
1026                                         $cmd = $this->replaceVars( $cmd );
1027                                         if ( $inputCallback ) {
1028                                                 $inputCallback( $cmd );
1029                                         }
1030                                         $res = $this->doQuery( $cmd );
1031                                         if ( $resultCallback ) {
1032                                                 call_user_func( $resultCallback, $res, $this );
1033                                         }
1034
1035                                         if ( $res === false ) {
1036                                                 $err = $this->lastError();
1037
1038                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1039                                         }
1040                                 }
1041
1042                                 $cmd = '';
1043                                 $done = false;
1044                         }
1045                 }
1046
1047                 return true;
1048         }
1049
1050         protected function doSelectDomain( DatabaseDomain $domain ) {
1051                 if ( $domain->getSchema() !== null ) {
1052                         // We use the *database* aspect of $domain for schema, not the domain schema
1053                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1054                 }
1055
1056                 $database = $domain->getDatabase();
1057                 if ( $database === null || $database === $this->user ) {
1058                         // Backward compatibility
1059                         $this->currentDomain = $domain;
1060
1061                         return true;
1062                 }
1063
1064                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1065                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1066                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1067                 $stmt = oci_parse( $this->conn, $sql );
1068                 Wikimedia\suppressWarnings();
1069                 $success = oci_execute( $stmt );
1070                 Wikimedia\restoreWarnings();
1071                 if ( $success ) {
1072                         // Update that domain fields on success (no exception thrown)
1073                         $this->currentDomain = $domain;
1074                 } else {
1075                         $e = oci_error( $stmt );
1076                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1077                 }
1078
1079                 return true;
1080         }
1081
1082         function strencode( $s ) {
1083                 return str_replace( "'", "''", $s );
1084         }
1085
1086         function addQuotes( $s ) {
1087                 return "'" . $this->strencode( $this->getVerifiedUTF8( $s ) ) . "'";
1088         }
1089
1090         public function addIdentifierQuotes( $s ) {
1091                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1092                         $s = '/*Q*/' . $s;
1093                 }
1094
1095                 return $s;
1096         }
1097
1098         public function removeIdentifierQuotes( $s ) {
1099                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1100         }
1101
1102         public function isQuotedIdentifier( $s ) {
1103                 return strpos( $s, '/*Q*/' ) !== false;
1104         }
1105
1106         private function wrapFieldForWhere( $table, &$col, &$val ) {
1107                 $col_info = $this->fieldInfoMulti( $table, $col );
1108                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1109                 if ( $col_type == 'CLOB' ) {
1110                         $col = 'TO_CHAR(' . $col . ')';
1111                         $val = $this->getVerifiedUTF8( $val );
1112                 } elseif ( $col_type == 'VARCHAR2' ) {
1113                         $val = $this->getVerifiedUTF8( $val );
1114                 }
1115         }
1116
1117         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1118                 $conds2 = [];
1119                 foreach ( $conds as $col => $val ) {
1120                         if ( is_array( $val ) ) {
1121                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1122                         } else {
1123                                 if ( is_numeric( $col ) && $parentCol != null ) {
1124                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1125                                 } else {
1126                                         $this->wrapFieldForWhere( $table, $col, $val );
1127                                 }
1128                                 $conds2[$col] = $val;
1129                         }
1130                 }
1131
1132                 return $conds2;
1133         }
1134
1135         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1136                 $options = [], $join_conds = []
1137         ) {
1138                 if ( is_array( $conds ) ) {
1139                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1140                 }
1141
1142                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1143         }
1144
1145         /**
1146          * Returns an optional USE INDEX clause to go after the table, and a
1147          * string to go at the end of the query
1148          *
1149          * @param array $options An associative array of options to be turned into
1150          *   an SQL query, valid keys are listed in the function.
1151          * @return array
1152          */
1153         function makeSelectOptions( $options ) {
1154                 $preLimitTail = $postLimitTail = '';
1155                 $startOpts = '';
1156
1157                 $noKeyOptions = [];
1158                 foreach ( $options as $key => $option ) {
1159                         if ( is_numeric( $key ) ) {
1160                                 $noKeyOptions[$option] = true;
1161                         }
1162                 }
1163
1164                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1165
1166                 $preLimitTail .= $this->makeOrderBy( $options );
1167
1168                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1169                         $postLimitTail .= ' FOR UPDATE';
1170                 }
1171
1172                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1173                         $startOpts .= 'DISTINCT';
1174                 }
1175
1176                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1177                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1178                 } else {
1179                         $useIndex = '';
1180                 }
1181
1182                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1183                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1184                 } else {
1185                         $ignoreIndex = '';
1186                 }
1187
1188                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1189         }
1190
1191         public function delete( $table, $conds, $fname = __METHOD__ ) {
1192                 global $wgActorTableSchemaMigrationStage;
1193
1194                 if ( is_array( $conds ) ) {
1195                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1196                 }
1197                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1198                 // all deletions on these tables have transactions so final failure rollbacks these updates
1199                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1200                 $table = $this->tableName( $table );
1201                 if ( $table == $this->tableName( 'user' ) &&
1202                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1203                 ) {
1204                         $this->update( 'archive', [ 'ar_user' => 0 ],
1205                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1206                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1207                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1208                         $this->update( 'image', [ 'img_user' => 0 ],
1209                                 [ 'img_user' => $conds['user_id'] ], $fname );
1210                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1211                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1212                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1213                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1214                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1215                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1216                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1217                                 [ 'us_user' => $conds['user_id'] ], $fname );
1218                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1219                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1220                         $this->update( 'logging', [ 'log_user' => 0 ],
1221                                 [ 'log_user' => $conds['user_id'] ], $fname );
1222                 } elseif ( $table == $this->tableName( 'image' ) ) {
1223                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1224                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1225                 }
1226
1227                 return parent::delete( $table, $conds, $fname );
1228         }
1229
1230         /**
1231          * @param string $table
1232          * @param array $values
1233          * @param array $conds
1234          * @param string $fname
1235          * @param array $options
1236          * @return bool
1237          * @throws DBUnexpectedError
1238          */
1239         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1240                 $table = $this->tableName( $table );
1241                 $opts = $this->makeUpdateOptions( $options );
1242                 $sql = "UPDATE $opts $table SET ";
1243
1244                 $first = true;
1245                 foreach ( $values as $col => &$val ) {
1246                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1247
1248                         if ( !$first ) {
1249                                 $sqlSet = ', ' . $sqlSet;
1250                         } else {
1251                                 $first = false;
1252                         }
1253                         $sql .= $sqlSet;
1254                 }
1255
1256                 if ( $conds !== [] && $conds !== '*' ) {
1257                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1258                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1259                 }
1260
1261                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1262                 if ( $stmt === false ) {
1263                         $e = oci_error( $this->conn );
1264                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1265
1266                         return false;
1267                 }
1268                 foreach ( $values as $col => &$val ) {
1269                         $col_info = $this->fieldInfoMulti( $table, $col );
1270                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1271
1272                         if ( $val === null ) {
1273                                 // do nothing ... null was inserted in statement creation
1274                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1275                                 if ( is_object( $val ) ) {
1276                                         $val = $val->getData();
1277                                 }
1278
1279                                 if (
1280                                         preg_match( '/^timestamp.*/i', $col_type ) == 1 &&
1281                                         strtolower( $val ) == 'infinity'
1282                                 ) {
1283                                         $val = '31-12-2030 12:00:00.000000';
1284                                 }
1285
1286                                 $val = $this->getVerifiedUTF8( $val );
1287                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1288                                         $e = oci_error( $stmt );
1289                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1290
1291                                         return false;
1292                                 }
1293                         } else {
1294                                 /** @var OCI_Lob[] $lob */
1295                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1296                                 if ( $lob[$col] === false ) {
1297                                         $e = oci_error( $stmt );
1298                                         throw new DBUnexpectedError(
1299                                                 $this,
1300                                                 "Cannot create LOB descriptor: " . $e['message']
1301                                         );
1302                                 }
1303
1304                                 if ( is_object( $val ) ) {
1305                                         $val = $val->getData();
1306                                 }
1307
1308                                 if ( $col_type == 'BLOB' ) {
1309                                         $lob[$col]->writeTemporary( $val );
1310                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1311                                 } else {
1312                                         $lob[$col]->writeTemporary( $val );
1313                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1314                                 }
1315                         }
1316                 }
1317
1318                 Wikimedia\suppressWarnings();
1319
1320                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1321                         $e = oci_error( $stmt );
1322                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1323                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1324
1325                                 return false;
1326                         } else {
1327                                 $this->mAffectedRows = oci_num_rows( $stmt );
1328                         }
1329                 } else {
1330                         $this->mAffectedRows = oci_num_rows( $stmt );
1331                 }
1332
1333                 Wikimedia\restoreWarnings();
1334
1335                 if ( isset( $lob ) ) {
1336                         foreach ( $lob as $lob_v ) {
1337                                 $lob_v->free();
1338                         }
1339                 }
1340
1341                 if ( !$this->trxLevel ) {
1342                         oci_commit( $this->conn );
1343                 }
1344
1345                 return oci_free_statement( $stmt );
1346         }
1347
1348         function bitNot( $field ) {
1349                 // expecting bit-fields smaller than 4bytes
1350                 return 'BITNOT(' . $field . ')';
1351         }
1352
1353         function bitAnd( $fieldLeft, $fieldRight ) {
1354                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1355         }
1356
1357         function bitOr( $fieldLeft, $fieldRight ) {
1358                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1359         }
1360
1361         public function buildGroupConcatField(
1362                 $delim, $table, $field, $conds = '', $join_conds = []
1363         ) {
1364                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1365
1366                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1367         }
1368
1369         public function buildSubstring( $input, $startPosition, $length = null ) {
1370                 $this->assertBuildSubstringParams( $startPosition, $length );
1371                 $params = [ $input, $startPosition ];
1372                 if ( $length !== null ) {
1373                         $params[] = $length;
1374                 }
1375                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1376         }
1377
1378         /**
1379          * @param string $field Field or column to cast
1380          * @return string
1381          * @since 1.28
1382          */
1383         public function buildStringCast( $field ) {
1384                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1385         }
1386
1387         public function getInfinity() {
1388                 return '31-12-2030 12:00:00.000000';
1389         }
1390
1391         /**
1392          * @param string $s
1393          * @return string
1394          */
1395         private function getVerifiedUTF8( $s ) {
1396                 if ( mb_check_encoding( (string)$s, 'UTF-8' ) ) {
1397                         return $s; // valid
1398                 }
1399
1400                 throw new DBUnexpectedError( $this, "Non BLOB/CLOB field must be UTF-8." );
1401         }
1402 }