includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * @ingroup Database
   4  * @file
   5  */
   6
   7 /**
   8  * This is the Oracle database abstraction layer.
   9  * @ingroup Database
  10  */
  11 class ORABlob {
  12         var $mData;
  13
  14         function __construct( $data ) {
  15                 $this->mData = $data;
  16         }
  17
  18         function getData() {
  19                 return $this->mData;
  20         }
  21 }
  22
  23 /**
  24  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  25  * other things.  We use a wrapper class to handle that and other
  26  * Oracle-specific bits, like converting column names back to lowercase.
  27  * @ingroup Database
  28  */
  29 class ORAResult {
  30         private $rows;
  31         private $cursor;
  32         private $stmt;
  33         private $nrows;
  34
  35         private $unique;
  36         private function array_unique_md( $array_in ) {
  37                 $array_out = array();
  38                 $array_hashes = array();
  39
  40                 foreach ( $array_in as $key => $item ) {
  41                         $hash = md5( serialize( $item ) );
  42                         if ( !isset( $array_hashes[$hash] ) ) {
  43                                 $array_hashes[$hash] = $hash;
  44                                 $array_out[] = $item;
  45                         }
  46                 }
  47
  48                 return $array_out;
  49         }
  50
  51         function __construct( &$db, $stmt, $unique = false ) {
  52                 $this->db =& $db;
  53
  54                 if ( ( $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, - 1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM ) ) === false ) {
  55                         $e = oci_error( $stmt );
  56                         $db->reportQueryError( $e['message'], $e['code'], '', __FUNCTION__ );
  57                         return;
  58                 }
  59
  60                 if ( $unique ) {
  61                         $this->rows = $this->array_unique_md( $this->rows );
  62                         $this->nrows = count( $this->rows );
  63                 }
  64
  65                 $this->cursor = 0;
  66                 $this->stmt = $stmt;
  67         }
  68
  69         public function free() {
  70                 oci_free_statement( $this->stmt );
  71         }
  72
  73         public function seek( $row ) {
  74                 $this->cursor = min( $row, $this->nrows );
  75         }
  76
  77         public function numRows() {
  78                 return $this->nrows;
  79         }
  80
  81         public function numFields() {
  82                 return oci_num_fields( $this->stmt );
  83         }
  84
  85         public function fetchObject() {
  86                 if ( $this->cursor >= $this->nrows )
  87                         return false;
  88                 $row = $this->rows[$this->cursor++];
  89                 $ret = new stdClass();
  90                 foreach ( $row as $k => $v ) {
  91                         $lc = strtolower( oci_field_name( $this->stmt, $k + 1 ) );
  92                         $ret->$lc = $v;
  93                 }
  94
  95                 return $ret;
  96         }
  97
  98         public function fetchRow() {
  99                 if ( $this->cursor >= $this->nrows )
 100                         return false;
 101
 102                 $row = $this->rows[$this->cursor++];
 103                 $ret = array();
 104                 foreach ( $row as $k => $v ) {
 105                         $lc = strtolower( oci_field_name( $this->stmt, $k + 1 ) );
 106                         $ret[$lc] = $v;
 107                         $ret[$k] = $v;
 108                 }
 109                 return $ret;
 110         }
 111 }
 112
 113 /**
 114  * Utility class.
 115  * @ingroup Database
 116  */
 117 class ORAField {
 118         private $name, $tablename, $default, $max_length, $nullable,
 119                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 120
 121         function __construct( $info ) {
 122                 $this->name = $info['column_name'];
 123                 $this->tablename = $info['table_name'];
 124                 $this->default = $info['data_default'];
 125                 $this->max_length = $info['data_length'];
 126                 $this->nullable = $info['not_null'];
 127                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 128                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 129                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 130                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 131                 $this->type = $info['data_type'];
 132         }
 133
 134         function name() {
 135                 return $this->name;
 136         }
 137
 138         function tableName() {
 139                 return $this->tablename;
 140         }
 141
 142         function defaultValue() {
 143                 return $this->default;
 144         }
 145
 146         function maxLength() {
 147                 return $this->max_length;
 148         }
 149
 150         function nullable() {
 151                 return $this->nullable;
 152         }
 153
 154         function isKey() {
 155                 return $this->is_key;
 156         }
 157
 158         function isMultipleKey() {
 159                 return $this->is_multiple;
 160         }
 161
 162         function type() {
 163                 return $this->type;
 164         }
 165 }
 166
 167 /**
 168  * @ingroup Database
 169  */
 170 class DatabaseOracle extends DatabaseBase {
 171         var $mInsertId = NULL;
 172         var $mLastResult = NULL;
 173         var $numeric_version = NULL;
 174         var $lastResult = null;
 175         var $cursor = 0;
 176         var $mAffectedRows;
 177
 178         var $ignore_DUP_VAL_ON_INDEX = false;
 179         var $sequenceData = null;
 180
 181         var $defaultCharset = 'AL32UTF8';
 182
 183         function DatabaseOracle( $server = false, $user = false, $password = false, $dbName = false,
 184                 $failFunction = false, $flags = 0, $tablePrefix = 'get from global' )
 185         {
 186                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper( $tablePrefix );
 187                 parent::__construct( $server, $user, $password, $dbName, $failFunction, $flags, $tablePrefix );
 188                 wfRunHooks( 'DatabaseOraclePostInit', array( &$this ) );
 189         }
 190
 191         function cascadingDeletes() {
 192                 return true;
 193         }
 194         function cleanupTriggers() {
 195                 return true;
 196         }
 197         function strictIPs() {
 198                 return true;
 199         }
 200         function realTimestamps() {
 201                 return true;
 202         }
 203         function implicitGroupby() {
 204                 return false;
 205         }
 206         function implicitOrderby() {
 207                 return false;
 208         }
 209         function searchableIPs() {
 210                 return true;
 211         }
 212
 213         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0 )
 214         {
 215                 return new DatabaseOracle( $server, $user, $password, $dbName, $failFunction, $flags );
 216         }
 217
 218         /**
 219          * Usually aborts on failure
 220          * If the failFunction is set to a non-zero integer, returns success
 221          */
 222         function open( $server, $user, $password, $dbName ) {
 223                 if ( !function_exists( 'oci_connect' ) ) {
 224                         throw new DBConnectionError( $this, "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n (Note: if you recently installed PHP, you may need to restart your webserver and database)\n" );
 225                 }
 226
 227                 // putenv("NLS_LANG=AMERICAN_AMERICA.AL32UTF8");
 228
 229                 $this->close();
 230                 $this->mServer = $server;
 231                 $this->mUser = $user;
 232                 $this->mPassword = $password;
 233                 $this->mDBname = $dbName;
 234
 235                 if ( !strlen( $user ) ) { # # e.g. the class is being loaded
 236                 return;
 237                 }
 238
 239                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 240                 if ( $this->mFlags & DBO_DEFAULT )
 241                         $this->mConn = oci_new_connect( $user, $password, $dbName, $this->defaultCharset, $session_mode );
 242                 else
 243                         $this->mConn = oci_connect( $user, $password, $dbName, $this->defaultCharset, $session_mode );
 244
 245                 if ( $this->mConn == false ) {
 246                         wfDebug( "DB connection error\n" );
 247                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 248                         wfDebug( $this->lastError() . "\n" );
 249                         return false;
 250                 }
 251
 252                 $this->mOpened = true;
 253
 254                 # removed putenv calls because they interfere with the system globaly
 255                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 256                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 257                 return $this->mConn;
 258         }
 259
 260         /**
 261          * Closes a database connection, if it is open
 262          * Returns success, true if already closed
 263          */
 264         function close() {
 265                 $this->mOpened = false;
 266                 if ( $this->mConn ) {
 267                         return oci_close( $this->mConn );
 268                 } else {
 269                         return true;
 270                 }
 271         }
 272
 273         function execFlags() {
 274                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 275         }
 276
 277         function doQuery( $sql ) {
 278                 wfDebug( "SQL: [$sql]\n" );
 279                 if ( !mb_check_encoding( $sql ) ) {
 280                         throw new MWException( "SQL encoding is invalid\n$sql" );
 281                 }
 282
 283                 // handle some oracle specifics
 284                 // remove AS column/table/subquery namings
 285                 if ( !defined( 'MEDIAWIKI_INSTALL' ) )
 286                         $sql = preg_replace( '/ as /i', ' ', $sql );
 287                 // Oracle has issues with UNION clause if the statement includes LOB fields
 288                 // So we do a UNION ALL and then filter the results array with array_unique
 289                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 290                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 291                 // you have to select data from plan table after explain
 292                 $olderr = error_reporting( E_ERROR );
 293                 $explain_id = date( 'dmYHis' );
 294                 error_reporting( $olderr );
 295
 296                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 297
 298
 299                 $olderr = error_reporting( E_ERROR );
 300
 301                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 302                         $e = oci_error( $this->mConn );
 303                         $this->reportQueryError( $e['message'], $e['code'], $sql, __FUNCTION__ );
 304                 }
 305
 306                 $olderr = error_reporting( E_ERROR );
 307                 if ( oci_execute( $stmt, $this->execFlags() ) == false ) {
 308                         $e = oci_error( $stmt );
 309                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' )
 310                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __FUNCTION__ );
 311                 }
 312                 error_reporting( $olderr );
 313
 314                 if ( $explain_count > 0 ) {
 315                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 316                 } elseif ( oci_statement_type( $stmt ) == "SELECT" ) {
 317                         return new ORAResult( $this, $stmt, $union_unique );
 318                 } else {
 319                         $this->mAffectedRows = oci_num_rows( $stmt );
 320                         return true;
 321                 }
 322         }
 323
 324         function queryIgnore( $sql, $fname = '' ) {
 325                 return $this->query( $sql, $fname, true );
 326         }
 327
 328         function freeResult( $res ) {
 329                 if ( $res instanceof ORAResult ) {
 330                         $res->free();
 331                 } else {
 332                         $res->result->free();
 333                 }
 334         }
 335
 336         function fetchObject( $res ) {
 337                 if ( $res instanceof ORAResult ) {
 338                         return $res->numRows();
 339                 } else {
 340                         return $res->result->fetchObject();
 341                 }
 342         }
 343
 344         function fetchRow( $res ) {
 345                 if ( $res instanceof ORAResult ) {
 346                         return $res->fetchRow();
 347                 } else {
 348                         return $res->result->fetchRow();
 349                 }
 350         }
 351
 352         function numRows( $res ) {
 353                 if ( $res instanceof ORAResult ) {
 354                         return $res->numRows();
 355                 } else {
 356                         return $res->result->numRows();
 357                 }
 358         }
 359
 360         function numFields( $res ) {
 361                 if ( $res instanceof ORAResult ) {
 362                         return $res->numFields();
 363                 } else {
 364                         return $res->result->numFields();
 365                 }
 366         }
 367
 368         function fieldName( $stmt, $n ) {
 369                 return oci_field_name( $stmt, $n );
 370         }
 371
 372         /**
 373          * This must be called after nextSequenceVal
 374          */
 375         function insertId() {
 376                 return $this->mInsertId;
 377         }
 378
 379         function dataSeek( $res, $row ) {
 380                 if ( $res instanceof ORAResult ) {
 381                         $res->seek( $row );
 382                 } else {
 383                         $res->result->seek( $row );
 384                 }
 385         }
 386
 387         function lastError() {
 388                 if ( $this->mConn === false )
 389                         $e = oci_error();
 390                 else
 391                         $e = oci_error( $this->mConn );
 392                 return $e['message'];
 393         }
 394
 395         function lastErrno() {
 396                 if ( $this->mConn === false )
 397                         $e = oci_error();
 398                 else
 399                         $e = oci_error( $this->mConn );
 400                 return $e['code'];
 401         }
 402
 403         function affectedRows() {
 404                 return $this->mAffectedRows;
 405         }
 406
 407         /**
 408          * Returns information about an index
 409          * If errors are explicitly ignored, returns NULL on failure
 410          */
 411         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 412                 return false;
 413         }
 414
 415         function indexUnique ( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 416                 return false;
 417         }
 418
 419         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 420                 if ( !count( $a ) )
 421                         return true;
 422
 423                 if ( !is_array( $options ) )
 424                         $options = array( $options );
 425
 426                 if ( in_array( 'IGNORE', $options ) )
 427                         $this->ignore_DUP_VAL_ON_INDEX = true;
 428
 429                 if ( !is_array( reset( $a ) ) ) {
 430                         $a = array( $a );
 431                 }
 432
 433                 foreach ( $a as &$row ) {
 434                         $this->insertOneRow( $table, $row, $fname );
 435                 }
 436                 $retVal = true;
 437
 438                 if ( in_array( 'IGNORE', $options ) )
 439                         $this->ignore_DUP_VAL_ON_INDEX = false;
 440
 441                 return $retVal;
 442         }
 443
 444         function insertOneRow( $table, $row, $fname ) {
 445                 global $wgLang;
 446
 447                 // "INSERT INTO tables (a, b, c)"
 448                 $sql = "INSERT INTO " . $this->tableName( $table ) . " (" . join( ',', array_keys( $row ) ) . ')';
 449                 $sql .= " VALUES (";
 450
 451                 // for each value, append ":key"
 452                 $first = true;
 453                 foreach ( $row as $col => $val ) {
 454                         if ( $first )
 455                                 $sql .= $val !== NULL ? ':' . $col : 'NULL';
 456                         else
 457                                 $sql .= $val !== NULL ? ', :' . $col : ', NULL';
 458
 459                         $first = false;
 460                 }
 461                 $sql .= ')';
 462
 463
 464                 $stmt = oci_parse( $this->mConn, $sql );
 465                 foreach ( $row as $col => &$val ) {
 466                         $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
 467
 468                         if ( $val === NULL ) {
 469                                 // do nothing ... null was inserted in statement creation
 470                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 471                                 if ( is_object( $val ) )
 472                                         $val = $val->getData();
 473
 474                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' )
 475                                         $val = '31-12-2030 12:00:00.000000';
 476
 477                                 $val = ( $wgLang != null ) ? $wgLang->checkTitleEncoding( $val ) : $val;
 478                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false )
 479                                         $this->reportQueryError( $this->lastErrno(), $this->lastError(), $sql, __METHOD__ );
 480                         } else {
 481                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 482                                         $e = oci_error( $stmt );
 483                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 484                                 }
 485
 486                                 if ( $col_type == 'BLOB' ) { // is_object($val)) {
 487                                         $lob[$col]->writeTemporary( $val ); // ->getData());
 488                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
 489                                 } else {
 490                                         $lob[$col]->writeTemporary( $val );
 491                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 492                                 }
 493                         }
 494                 }
 495
 496                 $olderr = error_reporting( E_ERROR );
 497                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
 498                         $e = oci_error( $stmt );
 499
 500                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' )
 501                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 502                         else
 503                                 $this->mAffectedRows = oci_num_rows( $stmt );
 504                 } else
 505                         $this->mAffectedRows = oci_num_rows( $stmt );
 506                 error_reporting( $olderr );
 507
 508                 if ( isset( $lob ) ) {
 509                         foreach ( $lob as $lob_i => $lob_v ) {
 510                                 $lob_v->free();
 511                         }
 512                 }
 513
 514                 if ( !$this->mTrxLevel )
 515                         oci_commit( $this->mConn );
 516
 517                 oci_free_statement( $stmt );
 518         }
 519
 520         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 521                 $insertOptions = array(), $selectOptions = array() )
 522         {
 523                 $destTable = $this->tableName( $destTable );
 524                 if ( !is_array( $selectOptions ) ) {
 525                         $selectOptions = array( $selectOptions );
 526                 }
 527                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 528                 if ( is_array( $srcTable ) ) {
 529                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 530                 } else {
 531                         $srcTable = $this->tableName( $srcTable );
 532                 }
 533
 534                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 535                                 !isset( $varMap[$sequenceData['column']] ) )
 536                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 537
 538                 // count-alias subselect fields to avoid abigious definition errors
 539                 $i = 0;
 540                 foreach ( $varMap as $key => &$val )
 541                         $val = $val . ' field' . ( $i++ );
 542
 543                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 544                         " SELECT $startOpts " . implode( ',', $varMap ) .
 545                         " FROM $srcTable $useIndex ";
 546                 if ( $conds != '*' ) {
 547                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 548                 }
 549                 $sql .= " $tailOpts";
 550
 551                 if ( in_array( 'IGNORE', $insertOptions ) )
 552                         $this->ignore_DUP_VAL_ON_INDEX = true;
 553
 554                 $retval = $this->query( $sql, $fname );
 555
 556                 if ( in_array( 'IGNORE', $insertOptions ) )
 557                         $this->ignore_DUP_VAL_ON_INDEX = false;
 558
 559                 return $retval;
 560         }
 561
 562         function tableName( $name ) {
 563                 global $wgSharedDB, $wgSharedPrefix, $wgSharedTables;
 564                 /*
 565                 Replace reserved words with better ones
 566                 Useing uppercase, because that's the only way oracle can handle
 567                 quoted tablenames
 568                 */
 569                 switch( $name ) {
 570                         case 'user':
 571                                 $name = 'MWUSER'; break;
 572                         case 'text':
 573                                 $name = 'PAGECONTENT'; break;
 574                 }
 575
 576                 /*
 577                         The rest of procedure is equal to generic Databse class
 578                         except for the quoting style
 579                 */
 580                 if ( $name[0] == '"' && substr( $name, - 1, 1 ) == '"' ) return $name;
 581
 582                 if ( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) return $name;
 583                 $dbDetails = array_reverse( explode( '.', $name, 2 ) );
 584                 if ( isset( $dbDetails[1] ) ) @list( $table, $database ) = $dbDetails;
 585                 else                         @list( $table ) = $dbDetails;
 586
 587                 $prefix = $this->mTablePrefix;
 588
 589                 if ( isset( $database ) ) $table = ( $table[0] == '`' ? $table : "`{$table}`" );
 590
 591                 if ( !isset( $database )
 592                  && isset( $wgSharedDB )
 593                  && $table[0] != '"'
 594                  && isset( $wgSharedTables )
 595                  && is_array( $wgSharedTables )
 596                  && in_array( $table, $wgSharedTables ) ) {
 597                         $database = $wgSharedDB;
 598                         $prefix   = isset( $wgSharedPrefix ) ? $wgSharedPrefix : $prefix;
 599                 }
 600
 601                 if ( isset( $database ) ) $database = ( $database[0] == '"' ? $database : "\"{$database}\"" );
 602                 $table = ( $table[0] == '"' ? $table : "\"{$prefix}{$table}\"" );
 603
 604                 $tableName = ( isset( $database ) ? "{$database}.{$table}" : "{$table}" );
 605
 606                 return strtoupper( $tableName );
 607         }
 608
 609         /**
 610          * Return the next in a sequence, save the value for retrieval via insertId()
 611          */
 612         function nextSequenceValue( $seqName ) {
 613                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 614                 $row = $this->fetchRow( $res );
 615                 $this->mInsertId = $row[0];
 616                 $this->freeResult( $res );
 617                 return $this->mInsertId;
 618         }
 619
 620         /**
 621          * Return sequence_name if table has a sequence
 622          */
 623         function getSequenceData( $table ) {
 624                 if ( $this->sequenceData == NULL ) {
 625                         $result = $this->query( "SELECT lower(us.sequence_name), lower(utc.table_name), lower(utc.column_name) from user_sequences us, user_tab_columns utc where us.sequence_name = utc.table_name||'_'||utc.column_name||'_SEQ'" );
 626
 627                         while ( ( $row = $result->fetchRow() ) !== false )
 628                                 $this->sequenceData[$this->tableName( $row[1] )] = array( 'sequence' => $row[0], 'column' => $row[2] );
 629                 }
 630
 631                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 632         }
 633
 634
 635         # REPLACE query wrapper
 636         # Oracle simulates this with a DELETE followed by INSERT
 637         # $row is the row to insert, an associative array
 638         # $uniqueIndexes is an array of indexes. Each element may be either a
 639         # field name or an array of field names
 640         #
 641         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 642         # However if you do this, you run the risk of encountering errors which wouldn't have
 643         # occurred in MySQL
 644         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 645                 $table = $this->tableName( $table );
 646
 647                 if ( count( $rows ) == 0 ) {
 648                         return;
 649                 }
 650
 651                 # Single row case
 652                 if ( !is_array( reset( $rows ) ) ) {
 653                         $rows = array( $rows );
 654                 }
 655
 656                 $sequenceData = $this->getSequenceData( $table );
 657
 658                 foreach ( $rows as $row ) {
 659                         # Delete rows which collide
 660                         if ( $uniqueIndexes ) {
 661                                 $condsDelete = array();
 662                                 foreach ( $uniqueIndexes as $index )
 663                                         $condsDelete[$index] = $row[$index];
 664                                 $this->delete( $table, $condsDelete, $fname );
 665 /*
 666                                 $sql = "DELETE FROM $table WHERE ";
 667                                 $first = true;
 668                                 foreach ( $uniqueIndexes as $index ) {
 669                                         if ( $first ) {
 670                                                 $first = false;
 671                                                 $sql .= "(";
 672                                         } else {
 673                                                 $sql .= ') OR (';
 674                                         }
 675                                         if ( is_array( $index ) ) {
 676                                                 $first2 = true;
 677                                                 foreach ( $index as $col ) {
 678                                                         if ( $first2 ) {
 679                                                                 $first2 = false;
 680                                                         } else {
 681                                                                 $sql .= ' AND ';
 682                                                         }
 683                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 684                                                 }
 685                                         } else {
 686                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 687                                         }
 688                                 }
 689                                 $sql .= ')';
 690
 691                                 $this->doQuery( $sql);//, $fname );
 692 */
 693                         }
 694
 695                         if ( $sequenceData !== false && !isset( $row[$sequenceData['column']] ) )
 696                                 $row[$sequenceData['column']] = $this->nextSequenceValue( $sequenceData['sequence'] );
 697
 698                         # Now insert the row
 699                         $this->insert( $table, $row, $fname );
 700                 }
 701         }
 702
 703         # DELETE where the condition is a join
 704         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "DatabaseOracle::deleteJoin" ) {
 705                 if ( !$conds ) {
 706                         throw new DBUnexpectedError( $this,  'DatabaseOracle::deleteJoin() called with empty $conds' );
 707                 }
 708
 709                 $delTable = $this->tableName( $delTable );
 710                 $joinTable = $this->tableName( $joinTable );
 711                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 712                 if ( $conds != '*' ) {
 713                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 714                 }
 715                 $sql .= ')';
 716
 717                 $this->query( $sql, $fname );
 718         }
 719
 720         # Returns the size of a text field, or -1 for "unlimited"
 721         function textFieldSize( $table, $field ) {
 722                 $table = $this->tableName( $table );
 723                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 724                         FROM pg_class c, pg_attribute a, pg_type t
 725                         WHERE relname='$table' AND a.attrelid=c.oid AND
 726                                 a.atttypid=t.oid and a.attname='$field'";
 727                 $res = $this->query( $sql );
 728                 $row = $this->fetchObject( $res );
 729                 if ( $row->ftype == "varchar" ) {
 730                         $size = $row->size - 4;
 731                 } else {
 732                         $size = $row->size;
 733                 }
 734                 $this->freeResult( $res );
 735                 return $size;
 736         }
 737
 738         function limitResult( $sql, $limit, $offset = false ) {
 739                 if ( $offset === false )
 740                         $offset = 0;
 741                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 742         }
 743
 744
 745         function unionQueries( $sqls, $all ) {
 746                 $glue = ' UNION ALL ';
 747                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 748         }
 749
 750         function wasDeadlock() {
 751                 return $this->lastErrno() == 'OCI-00060';
 752         }
 753
 754
 755         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 756                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 757                 return $this->query( 'BEGIN DUPLICATE_TABLE(\'' . $oldName . '\', \'' . $newName . '\', ' . $temporary . '); END;', $fname );
 758         }
 759
 760         function timestamp( $ts = 0 ) {
 761                 return wfTimestamp( TS_ORACLE, $ts );
 762         }
 763
 764         /**
 765          * Return aggregated value function call
 766          */
 767         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 768                 return $valuedata;
 769         }
 770
 771         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 772                 # Ignore errors during error handling to avoid infinite
 773                 # recursion
 774                 $ignore = $this->ignoreErrors( true );
 775                 ++$this->mErrorCount;
 776
 777                 if ( $ignore || $tempIgnore ) {
 778                         wfDebug( "SQL ERROR (ignored): $error\n" );
 779                         $this->ignoreErrors( $ignore );
 780                 }
 781                 else {
 782                         throw new DBQueryError($this, $error, $errno, $sql, $fname);
 783                 }
 784         }
 785
 786         /**
 787          * @return string wikitext of a link to the server software's web site
 788          */
 789         function getSoftwareLink() {
 790                 return "[http://www.oracle.com/ Oracle]";
 791         }
 792
 793         /**
 794          * @return string Version information from the database
 795          */
 796         function getServerVersion() {
 797                 return oci_server_version( $this->mConn );
 798         }
 799
 800         /**
 801          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 802          */
 803         function tableExists( $table ) {
 804                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 805                 $res = $this->doQuery( $SQL );
 806                 if ( $res ) {
 807                         $count = $res->numRows();
 808                         $res->free();
 809                 } else {
 810                         $count = 0;
 811                 }
 812                 return $count;
 813         }
 814
 815         /**
 816          * Query whether a given column exists in the mediawiki schema
 817          * based on prebuilt table to simulate MySQL field info and keep query speed minimal
 818          */
 819         function fieldExists( $table, $field, $fname = 'DatabaseOracle::fieldExists' ) {
 820                 if ( !isset( $this->fieldInfo_stmt ) )
 821                         $this->fieldInfo_stmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)' );
 822
 823                 oci_bind_by_name( $this->fieldInfo_stmt, ':tab', trim( $table, '"' ) );
 824                 oci_bind_by_name( $this->fieldInfo_stmt, ':col', $field );
 825
 826                 if ( oci_execute( $this->fieldInfo_stmt, OCI_DEFAULT ) === false ) {
 827                         $e = oci_error( $this->fieldInfo_stmt );
 828                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 829                         return false;
 830                 }
 831                 $res = new ORAResult( $this, $this->fieldInfo_stmt );
 832                 return $res->numRows() != 0;
 833         }
 834
 835         function fieldInfo( $table, $field ) {
 836                 if ( !isset( $this->fieldInfo_stmt ) )
 837                         $this->fieldInfo_stmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)' );
 838
 839                 $table = trim( $table, '"' );
 840                 oci_bind_by_name( $this->fieldInfo_stmt, ':tab', $table );
 841                 oci_bind_by_name( $this->fieldInfo_stmt, ':col', $field );
 842
 843                 if ( oci_execute( $this->fieldInfo_stmt, OCI_DEFAULT ) === false ) {
 844                         $e = oci_error( $this->fieldInfo_stmt );
 845                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 846                         return false;
 847                 }
 848                 $res = new ORAResult( $this, $this->fieldInfo_stmt );
 849                 return new ORAField( $res->fetchRow() );
 850         }
 851
 852         function begin( $fname = '' ) {
 853                 $this->mTrxLevel = 1;
 854         }
 855         function immediateCommit( $fname = '' ) {
 856                 return true;
 857         }
 858         function commit( $fname = '' ) {
 859                 oci_commit( $this->mConn );
 860                 $this->mTrxLevel = 0;
 861         }
 862
 863         /* Not even sure why this is used in the main codebase... */
 864         function limitResultForUpdate( $sql, $num ) {
 865                 return $sql;
 866         }
 867
 868         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 869         function sourceStream( $fp, $lineCallback = false, $resultCallback = false ) {
 870                 $cmd = "";
 871                 $done = false;
 872                 $dollarquote = false;
 873
 874                 $replacements = array();
 875
 876                 while ( ! feof( $fp ) ) {
 877                         if ( $lineCallback ) {
 878                                 call_user_func( $lineCallback );
 879                         }
 880                         $line = trim( fgets( $fp, 1024 ) );
 881                         $sl = strlen( $line ) - 1;
 882
 883                         if ( $sl < 0 ) { continue; }
 884                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) { continue; }
 885
 886                         // Allow dollar quoting for function declarations
 887                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 888                                 if ( $dollarquote ) {
 889                                         $dollarquote = false;
 890                                         $done = true;
 891                                 }
 892                                 else {
 893                                         $dollarquote = true;
 894                                 }
 895                         }
 896                         else if ( !$dollarquote ) {
 897                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
 898                                         $done = true;
 899                                         $line = substr( $line, 0, $sl );
 900                                 }
 901                         }
 902
 903                         if ( '' != $cmd ) { $cmd .= ' '; }
 904                         $cmd .= "$line\n";
 905
 906                         if ( $done ) {
 907                                 $cmd = str_replace( ';;', ";", $cmd );
 908                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
 909                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
 910                                                 $replacements[$defines[2]] = $defines[1];
 911                                         }
 912                                 } else {
 913                                         foreach ( $replacements as $mwVar => $scVar ) {
 914                                                 $cmd = str_replace( '&' . $scVar . '.', '{$' . $mwVar . '}', $cmd );
 915                                         }
 916
 917                                         $cmd = $this->replaceVars( $cmd );
 918                                         $res = $this->query( $cmd, __METHOD__ );
 919                                         if ( $resultCallback ) {
 920                                                 call_user_func( $resultCallback, $res, $this );
 921                                         }
 922
 923                                         if ( false === $res ) {
 924                                                 $err = $this->lastError();
 925                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
 926                                         }
 927                                 }
 928
 929                                 $cmd = '';
 930                                 $done = false;
 931                         }
 932                 }
 933                 return true;
 934         }
 935
 936         function setup_database() {
 937                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
 938
 939                 echo "<li>Creating DB objects</li>\n";
 940                 $res = $this->sourceFile( "../maintenance/ora/tables.sql" );
 941
 942                 // Avoid the non-standard "REPLACE INTO" syntax
 943                 echo "<li>Populating table interwiki</li>\n";
 944                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
 945                 if ( $f == false ) {
 946                         dieout( "<li>Could not find the interwiki.sql file</li>" );
 947                 }
 948
 949                 // do it like the postgres :D
 950                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
 951                 while ( ! feof( $f ) ) {
 952                         $line = fgets( $f, 1024 );
 953                         $matches = array();
 954                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) {
 955                                 continue;
 956                         }
 957                         $this->query( "$SQL $matches[1],$matches[2])" );
 958                 }
 959
 960                 echo "<li>Table interwiki successfully populated</li>\n";
 961         }
 962
 963         function strencode( $s ) {
 964                 return str_replace( "'", "''", $s );
 965         }
 966
 967 /*
 968         function encodeBlob($b) {
 969                 return $b; //new ORABlob($b);
 970         }
 971         function decodeBlob($b) {
 972                 return $b; //return $b->load();
 973         }
 974 */
 975         function addQuotes( $s ) {
 976                 global $wgLang;
 977                 if ( isset( $wgLang->mLoaded ) && $wgLang->mLoaded )
 978                         $s = $wgLang->checkTitleEncoding( $s );
 979                 return "'" . $this->strencode( $s ) . "'";
 980         }
 981
 982         function quote_ident( $s ) {
 983                 return $s;
 984         }
 985
 986         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
 987                 global $wgLang;
 988
 989                 $conds2 = array();
 990                 foreach ( $conds as $col => $val ) {
 991                         $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
 992                         if ( $col_type == 'CLOB' )
 993                                 $conds2['TO_CHAR(' . $col . ')'] = $wgLang->checkTitleEncoding( $val );
 994                         elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
 995                                 $conds2[$col] = $wgLang->checkTitleEncoding( $val );
 996                         } else {
 997                                 $conds2[$col] = $val;
 998                         }
 999                 }
1000
1001                 if ( is_array( $table ) )
1002                         foreach ( $table as $tab )
1003                                 $tab = $this->tableName( $tab );
1004                 else
1005                         $table = $this->tableName( $table );
1006
1007                 return parent::selectRow( $table, $vars, $conds2, $fname, $options, $join_conds );
1008         }
1009
1010         /**
1011          * Returns an optional USE INDEX clause to go after the table, and a
1012          * string to go at the end of the query
1013          *
1014          * @private
1015          *
1016          * @param $options Array: an associative array of options to be turned into
1017          *              an SQL query, valid keys are listed in the function.
1018          * @return array
1019          */
1020         function makeSelectOptions( $options ) {
1021                 $preLimitTail = $postLimitTail = '';
1022                 $startOpts = '';
1023
1024                 $noKeyOptions = array();
1025                 foreach ( $options as $key => $option ) {
1026                         if ( is_numeric( $key ) ) {
1027                                 $noKeyOptions[$option] = true;
1028                         }
1029                 }
1030
1031                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1032                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1033
1034                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1035                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1036                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1037
1038                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1039                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1040                 } else {
1041                         $useIndex = '';
1042                 }
1043
1044                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1045         }
1046
1047         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1048                 global $wgLang;
1049
1050                 if ( $wgLang != null ) {
1051                         $conds2 = array();
1052                         foreach ( $conds as $col => $val ) {
1053                                 $col_type = $this->fieldInfo( $this->tableName( $table ), $col )->type();
1054                                 if ( $col_type == 'CLOB' )
1055                                         $conds2['TO_CHAR(' . $col . ')'] = $wgLang->checkTitleEncoding( $val );
1056                                 else
1057                                         if ( is_array( $val ) ) {
1058                                                 $conds2[$col] = $val;
1059                                                 foreach ( $conds2[$col] as &$val2 )
1060                                                         $val2 = $wgLang->checkTitleEncoding( $val2 );
1061                                         } else {
1062                                                 $conds2[$col] = $wgLang->checkTitleEncoding( $val );
1063                                         }
1064                         }
1065
1066                         return parent::delete( $table, $conds2, $fname );
1067                 } else return parent::delete( $table, $conds, $fname );
1068         }
1069
1070         function bitNot( $field ) {
1071                 // expecting bit-fields smaller than 4bytes
1072                 return 'BITNOT(' . $bitField . ')';
1073         }
1074
1075         function bitAnd( $fieldLeft, $fieldRight ) {
1076                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1077         }
1078
1079         function bitOr( $fieldLeft, $fieldRight ) {
1080                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1081         }
1082
1083         /**
1084          * How lagged is this slave?
1085          *
1086          * @return int
1087          */
1088         public function getLag() {
1089                 # Not implemented for Oracle
1090                 return 0;
1091         }
1092
1093         function setFakeSlaveLag( $lag ) { }
1094         function setFakeMaster( $enabled = true ) { }
1095
1096         function getDBname() {
1097                 return $this->mDBname;
1098         }
1099
1100         function getServer() {
1101                 return $this->mServer;
1102         }
1103
1104         public function replaceVars( $ins ) {
1105                 $varnames = array( 'wgDBprefix' );
1106                 if ( $this->mFlags & DBO_SYSDBA ) {
1107                         $varnames[] = 'wgDBOracleDefTS';
1108                         $varnames[] = 'wgDBOracleTempTS';
1109                 }
1110
1111                 // Ordinary variables
1112                 foreach ( $varnames as $var ) {
1113                         if ( isset( $GLOBALS[$var] ) ) {
1114                                 $val = addslashes( $GLOBALS[$var] ); // FIXME: safety check?
1115                                 $ins = str_replace( '{$' . $var . '}', $val, $ins );
1116                                 $ins = str_replace( '/*$' . $var . '*/`', '`' . $val, $ins );
1117                                 $ins = str_replace( '/*$' . $var . '*/', $val, $ins );
1118                         }
1119                 }
1120
1121                 return parent::replaceVars( $ins );
1122         }
1123
1124         public function getSearchEngine() {
1125                 return "SearchOracle";
1126         }
1127 } // end DatabaseOracle class