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 $unique;
  36
  37         function __construct(&$db, $stmt, $unique = false) {
  38                 $this->db =& $db;
  39
  40                 if (($this->nrows = oci_fetch_all($stmt, $this->rows, 0, -1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM)) === false) {
  41                         $e = oci_error($stmt);
  42                         $db->reportQueryError($e['message'], $e['code'], '', __FUNCTION__);
  43                         return;
  44                 }
  45
  46                 if ($unique) {
  47                         $this->rows = array_unique($this->rows);
  48                         $this->nrows = count($this->rows);
  49                 }
  50
  51                 $this->cursor = 0;
  52                 $this->stmt = $stmt;
  53         }
  54
  55         public function free() {
  56                 oci_free_statement($this->stmt);
  57         }
  58
  59         public function seek($row) {
  60                 $this->cursor = min($row, $this->nrows);
  61         }
  62
  63         public function numRows() {
  64                 return $this->nrows;
  65         }
  66
  67         public function numFields() {
  68                 return oci_num_fields($this->stmt);
  69         }
  70
  71         public function fetchObject() {
  72                 if ($this->cursor >= $this->nrows)
  73                         return false;
  74                 $row = $this->rows[$this->cursor++];
  75                 $ret = new stdClass();
  76                 foreach ($row as $k => $v) {
  77                         $lc = strtolower(oci_field_name($this->stmt, $k + 1));
  78                         $ret->$lc = $v;
  79                 }
  80
  81                 return $ret;
  82         }
  83
  84         public function fetchRow() {
  85                 if ($this->cursor >= $this->nrows)
  86                         return false;
  87
  88                 $row = $this->rows[$this->cursor++];
  89                 $ret = array();
  90                 foreach ($row as $k => $v) {
  91                         $lc = strtolower(oci_field_name($this->stmt, $k + 1));
  92                         $ret[$lc] = $v;
  93                         $ret[$k] = $v;
  94                 }
  95                 return $ret;
  96         }
  97 }
  98
  99 /**
 100  * Utility class.
 101  * @ingroup Database
 102  */
 103 class ORAField {
 104         private $name, $tablename, $default, $max_length, $nullable,
 105                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 106
 107         function __construct($info) {
 108                 $this->name = $info['column_name'];
 109                 $this->tablename = $info['table_name'];
 110                 $this->default = $info['data_default'];
 111                 $this->max_length = $info['data_length'];
 112                 $this->nullable = $info['not_null'];
 113                 $this->is_pk = isset($info['prim']) && $info['prim'] == 1 ? 1 : 0;
 114                 $this->is_unique = isset($info['uniq']) && $info['uniq'] == 1 ? 1 : 0;
 115                 $this->is_multiple = isset($info['nonuniq']) && $info['nonuniq'] == 1 ? 1 : 0;
 116                 $this->is_key = ($this->is_pk || $this->is_unique || $this->is_multiple);
 117                 $this->type = $info['data_type'];
 118         }
 119
 120         function name() {
 121                 return $this->name;
 122         }
 123
 124         function tableName() {
 125                 return $this->tablename;
 126         }
 127
 128         function defaultValue() {
 129                 return $this->default;
 130         }
 131
 132         function maxLength() {
 133                 return $this->max_length;
 134         }
 135
 136         function nullable() {
 137                 return $this->nullable;
 138         }
 139
 140         function isKey() {
 141                 return $this->is_key;
 142         }
 143
 144         function isMultipleKey() {
 145                 return $this->is_multiple;
 146         }
 147
 148         function type() {
 149                 return $this->type;
 150         }
 151 }
 152
 153 /**
 154  * @ingroup Database
 155  */
 156 class DatabaseOracle extends Database {
 157         var $mInsertId = NULL;
 158         var $mLastResult = NULL;
 159         var $numeric_version = NULL;
 160         var $lastResult = null;
 161         var $cursor = 0;
 162         var $mAffectedRows;
 163
 164         var $ignore_DUP_VAL_ON_INDEX = false;
 165
 166         function DatabaseOracle($server = false, $user = false, $password = false, $dbName = false,
 167                 $failFunction = false, $flags = 0, $tablePrefix = 'get from global' )
 168         {
 169                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper($tablePrefix);
 170                 parent::__construct($server, $user, $password, $dbName, $failFunction, $flags, $tablePrefix);
 171                 wfRunHooks( 'DatabaseOraclePostInit', array(&$this));
 172         }
 173
 174         function cascadingDeletes() {
 175                 return true;
 176         }
 177         function cleanupTriggers() {
 178                 return true;
 179         }
 180         function strictIPs() {
 181                 return true;
 182         }
 183         function realTimestamps() {
 184                 return true;
 185         }
 186         function implicitGroupby() {
 187                 return false;
 188         }
 189         function implicitOrderby() {
 190                 return false;
 191         }
 192         function searchableIPs() {
 193                 return true;
 194         }
 195
 196         static function newFromParams( $server = false, $user = false, $password = false, $dbName = false,
 197                 $failFunction = false, $flags = 0)
 198         {
 199                 return new DatabaseOracle( $server, $user, $password, $dbName, $failFunction, $flags );
 200         }
 201
 202         /**
 203          * Usually aborts on failure
 204          * If the failFunction is set to a non-zero integer, returns success
 205          */
 206         function open( $server, $user, $password, $dbName ) {
 207                 if ( !function_exists( 'oci_connect' ) ) {
 208                         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" );
 209                 }
 210
 211                 putenv("NLS_LANG=AMERICAN_AMERICA.AL32UTF8");
 212
 213                 $this->close();
 214                 $this->mServer = $server;
 215                 $this->mUser = $user;
 216                 $this->mPassword = $password;
 217                 $this->mDBname = $dbName;
 218
 219                 if (!strlen($user)) { ## e.g. the class is being loaded
 220                 return;
 221                 }
 222
 223                 //error_reporting( E_ALL ); //whoever had this bright idea
 224                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 225                 if ( $this->mFlags & DBO_DEFAULT )
 226                         $this->mConn = oci_new_connect($user, $password, $dbName, null, $session_mode);
 227                 else
 228                         $this->mConn = oci_connect($user, $password, $dbName, null, $session_mode);
 229
 230                 if ($this->mConn == false) {
 231                         wfDebug("DB connection error\n");
 232                         wfDebug("Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n");
 233                         wfDebug($this->lastError()."\n");
 234                         return false;
 235                 }
 236
 237                 $this->mOpened = true;
 238
 239                 #removed putenv calls because they interfere with the system globaly
 240                 $this->doQuery('ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'');
 241                 $this->doQuery('ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'');
 242
 243                 return $this->mConn;
 244         }
 245
 246         /**
 247          * Closes a database connection, if it is open
 248          * Returns success, true if already closed
 249          */
 250         function close() {
 251                 $this->mOpened = false;
 252                 if ( $this->mConn ) {
 253                         return oci_close( $this->mConn );
 254                 } else {
 255                         return true;
 256                 }
 257         }
 258
 259         function execFlags() {
 260                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 261         }
 262
 263         function doQuery($sql) {
 264                 wfDebug("SQL: [$sql]\n");
 265                 if (!mb_check_encoding($sql)) {
 266                         throw new MWException("SQL encoding is invalid");
 267                 }
 268
 269                 //handle some oracle specifics
 270                 //remove AS column/table/subquery namings
 271                 $sql = preg_replace('/ as /i', ' ', $sql);
 272                 // Oracle has issues with UNION clause if the statement includes LOB fields
 273                 // So we do a UNION ALL and then filter the results array with array_unique
 274                 $union_unique = (preg_match('/\/\* UNION_UNIQUE \*\/ /', $sql) != 0);
 275                 //EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 276                 //you have to select data from plan table after explain
 277                 $explain_id = date('dmYHis');
 278                 $sql = preg_replace('/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \''.$explain_id.'\' FOR', $sql, 1, $explain_count);
 279
 280
 281                 if (($this->mLastResult = $stmt = oci_parse($this->mConn, $sql)) === false) {
 282                         $e = oci_error($this->mConn);
 283                         $this->reportQueryError($e['message'], $e['code'], $sql, __FUNCTION__);
 284                 }
 285
 286                 $olderr = error_reporting(E_ERROR);
 287                 if (oci_execute($stmt, $this->execFlags()) == false) {
 288                         $e = oci_error($stmt);
 289                         if (!$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1')
 290                                 $this->reportQueryError($e['message'], $e['code'], $sql, __FUNCTION__);
 291                 }
 292                 error_reporting($olderr);
 293
 294                 if ($explain_count > 0) {
 295                         return $this->doQuery('SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \''.$explain_id.'\'');
 296                 } elseif (oci_statement_type($stmt) == "SELECT") {
 297                         return new ORAResult($this, $stmt, $union_unique);
 298                 } else {
 299                         $this->mAffectedRows = oci_num_rows($stmt);
 300                         return true;
 301                 }
 302         }
 303
 304         function queryIgnore($sql, $fname = '') {
 305                 return $this->query($sql, $fname, true);
 306         }
 307
 308         function freeResult($res) {
 309                 if ( $res instanceof ORAResult ) {
 310                         $res->free();
 311                 } else {
 312                         $res->result->free();
 313                 }
 314         }
 315
 316         function fetchObject($res) {
 317                 if ( $res instanceof ORAResult ) {
 318                         return $res->numRows();
 319                 } else {
 320                         return $res->result->fetchObject();
 321                 }
 322         }
 323
 324         function fetchRow($res) {
 325                 if ( $res instanceof ORAResult ) {
 326                         return $res->fetchRow();
 327                 } else {
 328                         return $res->result->fetchRow();
 329                 }
 330         }
 331
 332         function numRows($res) {
 333                 if ( $res instanceof ORAResult ) {
 334                         return $res->numRows();
 335                 } else {
 336                         return $res->result->numRows();
 337                 }
 338         }
 339
 340         function numFields($res) {
 341                 if ( $res instanceof ORAResult ) {
 342                         return $res->numFields();
 343                 } else {
 344                         return $res->result->numFields();
 345                 }
 346         }
 347
 348         function fieldName($stmt, $n) {
 349                 return oci_field_name($stmt, $n);
 350         }
 351
 352         /**
 353          * This must be called after nextSequenceVal
 354          */
 355         function insertId() {
 356                 return $this->mInsertId;
 357         }
 358
 359         function dataSeek($res, $row) {
 360                 if ( $res instanceof ORAResult ) {
 361                         $res->seek($row);
 362                 } else {
 363                         $res->result->seek($row);
 364                 }
 365         }
 366
 367         function lastError() {
 368                 if ($this->mConn === false)
 369                         $e = oci_error();
 370                 else
 371                         $e = oci_error($this->mConn);
 372                 return $e['message'];
 373         }
 374
 375         function lastErrno() {
 376                 if ($this->mConn === false)
 377                         $e = oci_error();
 378                 else
 379                         $e = oci_error($this->mConn);
 380                 return $e['code'];
 381         }
 382
 383         function affectedRows() {
 384                 return $this->mAffectedRows;
 385         }
 386
 387         /**
 388          * Returns information about an index
 389          * If errors are explicitly ignored, returns NULL on failure
 390          */
 391         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 392                 return false;
 393         }
 394
 395         function indexUnique ($table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 396                 return false;
 397         }
 398
 399         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 400                 if ( !count( $a ) )
 401                         return true;
 402
 403                 if (!is_array($options))
 404                         $options = array($options);
 405
 406     if (in_array('IGNORE', $options))
 407                         $this->ignore_DUP_VAL_ON_INDEX = true;
 408
 409                 if (!is_array(reset($a))) {
 410                         $a = array($a);
 411                 }
 412                 foreach ($a as $row) {
 413                         $this->insertOneRow($table, $row, $fname);
 414                 }
 415                 $retVal = true;
 416
 417                 if (in_array('IGNORE', $options))
 418                         $this->ignore_DUP_VAL_ON_INDEX = false;
 419
 420                 return $retVal;
 421         }
 422
 423         function insertOneRow($table, $row, $fname) {
 424                 global $wgLang;
 425
 426                 // "INSERT INTO tables (a, b, c)"
 427                 $sql = "INSERT INTO " . $this->tableName($table) . " (" . join(',', array_keys($row)) . ')';
 428                 $sql .= " VALUES (";
 429
 430                 // for each value, append ":key"
 431                 $first = true;
 432                 foreach ($row as $col => $val) {
 433                         if ($first)
 434                                 $sql .= ':'.$col;
 435                         else
 436                                 $sql.= ', :'.$col;
 437
 438                         $first = false;
 439                 }
 440                 $sql .= ')';
 441
 442                 $stmt = oci_parse($this->mConn, $sql);
 443                 foreach ($row as $col => $val) {
 444                         if (!is_object($val)) {
 445                                 if (oci_bind_by_name($stmt, ":$col", $row[$col]) === false)
 446                                         $this->reportQueryError($this->lastErrno(), $this->lastError(), $sql, __METHOD__);
 447                         }
 448                 }
 449
 450                 $stmt = oci_parse($this->mConn, $sql);
 451                 foreach ($row as $col => $val) {
 452                         $col_type=$this->fieldInfo($this->tableName($table), $col)->type();
 453                         if ($col_type != 'BLOB' && $col_type != 'CLOB') {
 454                                 if (is_object($val))
 455                                         $val = $val->getData();
 456
 457                                 if (preg_match('/^timestamp.*/i', $col_type) == 1 && strtolower($val) == 'infinity')
 458                                         $val = '31-12-2030 12:00:00.000000';
 459
 460                                 if (oci_bind_by_name($stmt, ":$col", $wgLang->checkTitleEncoding($val)) === false)
 461                                         $this->reportQueryError($this->lastErrno(), $this->lastError(), $sql, __METHOD__);
 462                         } else {
 463                                 if (($lob[$col] = oci_new_descriptor($this->mConn, OCI_D_LOB)) === false) {
 464                                         $e = oci_error($stmt);
 465                                         throw new DBUnexpectedError($this, "Cannot create LOB descriptor: " . $e['message']);
 466                                 }
 467
 468                                 if (is_object($val)) {
 469                                         $lob[$col]->writeTemporary($val->getData());
 470                                         oci_bind_by_name($stmt, ":$col", $lob[$col], -1, SQLT_BLOB);
 471                                 } else {
 472                                         $lob[$col]->writeTemporary($val);
 473                                         oci_bind_by_name($stmt, ":$col", $lob[$col], -1, OCI_B_CLOB);
 474                                 }
 475                         }
 476                 }
 477
 478                 $olderr = error_reporting(E_ERROR);
 479                 if (oci_execute($stmt, OCI_DEFAULT) === false) {
 480                         $e = oci_error($stmt);
 481
 482                         if (!$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1')
 483                                 $this->reportQueryError($e['message'], $e['code'], $sql, __METHOD__);
 484                         else
 485                                 $this->mAffectedRows = oci_num_rows($stmt);
 486                 } else
 487                         $this->mAffectedRows = oci_num_rows($stmt);
 488                 error_reporting($olderr);
 489
 490                 if (isset($lob)){
 491                         foreach ($lob as $lob_i => $lob_v) {
 492                                 $lob_v->free();
 493                         }
 494                 }
 495
 496                 if (!$this->mTrxLevel)
 497                         oci_commit($this->mConn);
 498
 499                 oci_free_statement($stmt);
 500         }
 501
 502         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 503                 $insertOptions = array(), $selectOptions = array() )
 504         {
 505                 $destTable = $this->tableName( $destTable );
 506                 if( !is_array( $selectOptions ) ) {
 507                         $selectOptions = array( $selectOptions );
 508                 }
 509                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 510                 if( is_array( $srcTable ) ) {
 511                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 512                 } else {
 513                         $srcTable = $this->tableName( $srcTable );
 514                 }
 515                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 516                         " SELECT $startOpts " . implode( ',', $varMap ) .
 517                         " FROM $srcTable $useIndex ";
 518                 if ( $conds != '*' ) {
 519                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 520                 }
 521                 $sql .= " $tailOpts";
 522
 523                 if (in_array('IGNORE', $insertOptions))
 524                         $this->ignore_DUP_VAL_ON_INDEX = true;
 525
 526                 $retval = $this->query( $sql, $fname );
 527
 528                 if (in_array('IGNORE', $insertOptions))
 529                         $this->ignore_DUP_VAL_ON_INDEX = false;
 530
 531                 return $retval;
 532         }
 533
 534         function tableName( $name ) {
 535                 global $wgSharedDB, $wgSharedPrefix, $wgSharedTables;
 536                 /*
 537                 Replace reserved words with better ones
 538                 Useing uppercase, because that's the only way oracle can handle
 539                 quoted tablenames
 540                 */
 541                 switch( $name ) {
 542                         case 'user':
 543                                 $name = 'MWUSER'; break;
 544                         case 'text':
 545                                 $name = 'PAGECONTENT'; break;
 546                 }
 547
 548                 /*
 549                         The rest of procedure is equal to generic Databse class
 550                         except for the quoting style
 551                 */
 552                 if ( $name[0] == '"' && substr( $name, -1, 1 ) == '"' ) return $name;
 553
 554                 if( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) return $name;
 555                 $dbDetails = array_reverse( explode( '.', $name, 2 ) );
 556                 if( isset( $dbDetails[1] ) ) @list( $table, $database ) = $dbDetails;
 557                 else                         @list( $table ) = $dbDetails;
 558
 559                 $prefix = $this->mTablePrefix;
 560
 561                 if( isset($database) ) $table = ( $table[0] == '`' ? $table : "`{$table}`" );
 562
 563                 if( !isset( $database )
 564                  && isset( $wgSharedDB )
 565                  && $table[0] != '"'
 566                  && isset( $wgSharedTables )
 567                  && is_array( $wgSharedTables )
 568                  && in_array( $table, $wgSharedTables ) ) {
 569                         $database = $wgSharedDB;
 570                         $prefix   = isset( $wgSharedPrefix ) ? $wgSharedPrefix : $prefix;
 571                 }
 572
 573                 if( isset($database) ) $database = ( $database[0] == '"' ? $database : "\"{$database}\"" );
 574                 $table = ( $table[0] == '"' ? $table : "\"{$prefix}{$table}\"" );
 575
 576                 $tableName = ( isset($database) ? "{$database}.{$table}" : "{$table}" );
 577
 578                 return strtoupper($tableName);
 579         }
 580
 581         /**
 582          * Return the next in a sequence, save the value for retrieval via insertId()
 583          */
 584         function nextSequenceValue($seqName) {
 585                 $res = $this->query("SELECT $seqName.nextval FROM dual");
 586                 $row = $this->fetchRow($res);
 587                 $this->mInsertId = $row[0];
 588                 $this->freeResult($res);
 589                 return $this->mInsertId;
 590         }
 591
 592         /**
 593          * Oracle does not have a "USE INDEX" clause, so return an empty string
 594          */
 595         function useIndexClause($index) {
 596                 return '';
 597         }
 598
 599         # REPLACE query wrapper
 600         # Oracle simulates this with a DELETE followed by INSERT
 601         # $row is the row to insert, an associative array
 602         # $uniqueIndexes is an array of indexes. Each element may be either a
 603         # field name or an array of field names
 604         #
 605         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 606         # However if you do this, you run the risk of encountering errors which wouldn't have
 607         # occurred in MySQL
 608         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 609                 $table = $this->tableName($table);
 610
 611                 if (count($rows)==0) {
 612                         return;
 613                 }
 614
 615                 # Single row case
 616                 if (!is_array(reset($rows))) {
 617                         $rows = array($rows);
 618                 }
 619
 620                 foreach( $rows as $row ) {
 621                         # Delete rows which collide
 622                         if ( $uniqueIndexes ) {
 623                                 $sql = "DELETE FROM $table WHERE ";
 624                                 $first = true;
 625                                 foreach ( $uniqueIndexes as $index ) {
 626                                         if ( $first ) {
 627                                                 $first = false;
 628                                                 $sql .= "(";
 629                                         } else {
 630                                                 $sql .= ') OR (';
 631                                         }
 632                                         if ( is_array( $index ) ) {
 633                                                 $first2 = true;
 634                                                 foreach ( $index as $col ) {
 635                                                         if ( $first2 ) {
 636                                                                 $first2 = false;
 637                                                         } else {
 638                                                                 $sql .= ' AND ';
 639                                                         }
 640                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 641                                                 }
 642                                         } else {
 643                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 644                                         }
 645                                 }
 646                                 $sql .= ')';
 647                                 $this->query( $sql, $fname );
 648                         }
 649
 650                         # Now insert the row
 651                         $this->insert( $table, $row, $fname );
 652                 }
 653         }
 654
 655         # DELETE where the condition is a join
 656         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "DatabaseOracle::deleteJoin" ) {
 657                 if ( !$conds ) {
 658                         throw new DBUnexpectedError($this,  'DatabaseOracle::deleteJoin() called with empty $conds' );
 659                 }
 660
 661                 $delTable = $this->tableName( $delTable );
 662                 $joinTable = $this->tableName( $joinTable );
 663                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 664                 if ( $conds != '*' ) {
 665                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 666                 }
 667                 $sql .= ')';
 668
 669                 $this->query( $sql, $fname );
 670         }
 671
 672         # Returns the size of a text field, or -1 for "unlimited"
 673         function textFieldSize( $table, $field ) {
 674                 $table = $this->tableName( $table );
 675                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 676                         FROM pg_class c, pg_attribute a, pg_type t
 677                         WHERE relname='$table' AND a.attrelid=c.oid AND
 678                                 a.atttypid=t.oid and a.attname='$field'";
 679                 $res =$this->query($sql);
 680                 $row=$this->fetchObject($res);
 681                 if ($row->ftype=="varchar") {
 682                         $size=$row->size-4;
 683                 } else {
 684                         $size=$row->size;
 685                 }
 686                 $this->freeResult( $res );
 687                 return $size;
 688         }
 689
 690         function lowPriorityOption() {
 691                 return '';
 692         }
 693
 694         function limitResult($sql, $limit, $offset) {
 695                 if ($offset === false)
 696                         $offset = 0;
 697                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 698         }
 699
 700
 701         function unionQueries($sqls, $all = false) {
 702                 $glue = ' UNION ALL ';
 703                 return 'SELECT * '.($all?'':'/* UNION_UNIQUE */ ').'FROM ('.implode( $glue, $sqls ).')' ;
 704         }
 705
 706         /**
 707          * Returns an SQL expression for a simple conditional.
 708          * Uses CASE on Oracle
 709          *
 710          * @param $cond String: SQL expression which will result in a boolean value
 711          * @param $trueVal String: SQL expression to return if true
 712          * @param $falseVal String: SQL expression to return if false
 713          * @return String: SQL fragment
 714          */
 715         function conditional( $cond, $trueVal, $falseVal ) {
 716                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 717         }
 718
 719         function wasDeadlock() {
 720                 return $this->lastErrno() == 'OCI-00060';
 721         }
 722
 723         function timestamp($ts = 0) {
 724                 return wfTimestamp(TS_ORACLE, $ts);
 725         }
 726
 727         /**
 728          * Return aggregated value function call
 729          */
 730         function aggregateValue ($valuedata,$valuename='value') {
 731                 return $valuedata;
 732         }
 733
 734         function reportQueryError($error, $errno, $sql, $fname, $tempIgnore = false) {
 735                 # Ignore errors during error handling to avoid infinite
 736                 # recursion
 737                 $ignore = $this->ignoreErrors(true);
 738                 ++$this->mErrorCount;
 739
 740                 if ($ignore || $tempIgnore) {
 741 //echo "error ignored! query = [$sql]\n";
 742                         wfDebug("SQL ERROR (ignored): $error\n");
 743                         $this->ignoreErrors( $ignore );
 744                 }
 745                 else {
 746 //echo "error!\n";
 747                         $message = "A database error has occurred\n" .
 748                                 "Query: $sql\n" .
 749                                 "Function: $fname\n" .
 750                                 "Error: $errno $error\n";
 751                         throw new DBUnexpectedError($this, $message);
 752                 }
 753         }
 754
 755         /**
 756          * @return string wikitext of a link to the server software's web site
 757          */
 758         function getSoftwareLink() {
 759                 return "[http://www.oracle.com/ Oracle]";
 760         }
 761
 762         /**
 763          * @return string Version information from the database
 764          */
 765         function getServerVersion() {
 766                 return oci_server_version($this->mConn);
 767         }
 768
 769         /**
 770          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 771          */
 772         function tableExists($table) {
 773                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 774                 $res = $this->doQuery($SQL);
 775                 if ($res) {
 776                         $count = $res->numRows();
 777                         $res->free();
 778                 } else {
 779                         $count = 0;
 780                 }
 781                 return $count;
 782         }
 783
 784         /**
 785          * Query whether a given column exists in the mediawiki schema
 786          * based on prebuilt table to simulate MySQL field info and keep query speed minimal
 787          */
 788         function fieldExists( $table, $field ) {
 789                 if (!isset($this->fieldInfo_stmt))
 790                         $this->fieldInfo_stmt = oci_parse($this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)');
 791
 792                 oci_bind_by_name($this->fieldInfo_stmt, ':tab', trim($table, '"'));
 793                 oci_bind_by_name($this->fieldInfo_stmt, ':col', $field);
 794
 795                 if (oci_execute($this->fieldInfo_stmt, OCI_DEFAULT) === false) {
 796                         $e = oci_error($this->fieldInfo_stmt);
 797                         $this->reportQueryError($e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__);
 798                         return false;
 799                 }
 800                 $res = new ORAResult($this,$this->fieldInfo_stmt);
 801                 return $res->numRows() != 0;
 802         }
 803
 804         function fieldInfo( $table, $field ) {
 805                 if (!isset($this->fieldInfo_stmt))
 806                         $this->fieldInfo_stmt = oci_parse($this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name = upper(:tab) and column_name = UPPER(:col)');
 807
 808                 oci_bind_by_name($this->fieldInfo_stmt, ':tab', trim($table, '"'));
 809                 oci_bind_by_name($this->fieldInfo_stmt, ':col', $field);
 810
 811                 if (oci_execute($this->fieldInfo_stmt, OCI_DEFAULT) === false) {
 812                         $e = oci_error($this->fieldInfo_stmt);
 813                         $this->reportQueryError($e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__);
 814                         return false;
 815                 }
 816                 $res = new ORAResult($this,$this->fieldInfo_stmt);
 817                 return new ORAField($res->fetchRow());
 818         }
 819
 820         function begin( $fname = '' ) {
 821                 $this->mTrxLevel = 1;
 822         }
 823         function immediateCommit( $fname = '' ) {
 824                 return true;
 825         }
 826         function commit( $fname = '' ) {
 827                 oci_commit($this->mConn);
 828                 $this->mTrxLevel = 0;
 829         }
 830
 831         /* Not even sure why this is used in the main codebase... */
 832         function limitResultForUpdate($sql, $num) {
 833                 return $sql;
 834         }
 835
 836         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 837         function sourceStream( $fp, $lineCallback = false, $resultCallback = false ) {
 838                 $cmd = "";
 839                 $done = false;
 840                 $dollarquote = false;
 841
 842                 $replacements = array();
 843
 844                 while ( ! feof( $fp ) ) {
 845                         if ( $lineCallback ) {
 846                                 call_user_func( $lineCallback );
 847                         }
 848                         $line = trim( fgets( $fp, 1024 ) );
 849                         $sl = strlen( $line ) - 1;
 850
 851                         if ( $sl < 0 ) { continue; }
 852                         if ( '-' == $line{0} && '-' == $line{1} ) { continue; }
 853
 854                         // Allow dollar quoting for function declarations
 855                         if (substr($line,0,8) == '/*$mw$*/') {
 856                                 if ($dollarquote) {
 857                                         $dollarquote = false;
 858                                         $done = true;
 859                                 }
 860                                 else {
 861                                         $dollarquote = true;
 862                                 }
 863                         }
 864                         else if (!$dollarquote) {
 865                                 if ( ';' == $line{$sl} && ($sl < 2 || ';' != $line{$sl - 1})) {
 866                                         $done = true;
 867                                         $line = substr( $line, 0, $sl );
 868                                 }
 869                         }
 870
 871                         if ( '' != $cmd ) { $cmd .= ' '; }
 872                         $cmd .= "$line\n";
 873
 874                         if ( $done ) {
 875                                 $cmd = str_replace(';;', ";", $cmd);
 876                                 if (strtolower(substr($cmd, 0, 6)) == 'define' ) {
 877                                         if (preg_match('/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines)) {
 878                                                 $replacements[$defines[2]] = $defines[1];
 879                                         }
 880                                 } else {
 881                                         foreach ( $replacements as $mwVar=>$scVar ) {
 882                                                 $cmd = str_replace( '&' . $scVar . '.', '{$'.$mwVar.'}', $cmd );
 883                                         }
 884
 885                                         $cmd = $this->replaceVars( $cmd );
 886                                         $res = $this->query( $cmd, __METHOD__ );
 887                                         if ( $resultCallback ) {
 888                                                 call_user_func( $resultCallback, $res, $this );
 889                                         }
 890
 891                                         if ( false === $res ) {
 892                                                 $err = $this->lastError();
 893                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
 894                                         }
 895                                 }
 896
 897                                 $cmd = '';
 898                                 $done = false;
 899                         }
 900                 }
 901                 return true;
 902         }
 903
 904         function setup_database() {
 905                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
 906
 907                 echo "<li>Creating DB objects</li>\n";
 908                 $res = dbsource( "../maintenance/ora/tables.sql", $this);
 909
 910                 // Avoid the non-standard "REPLACE INTO" syntax
 911                 echo "<li>Populating table interwiki</li>\n";
 912                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
 913                 if ($f == false ) {
 914                         dieout( "<li>Could not find the interwiki.sql file</li>");
 915                 }
 916
 917                 //do it like the postgres :D
 918                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
 919                 while ( ! feof( $f ) ) {
 920                         $line = fgets($f,1024);
 921                         $matches = array();
 922                         if (!preg_match('/^\s*(\(.+?),(\d)\)/', $line, $matches)) {
 923                                 continue;
 924                         }
 925                         $this->query("$SQL $matches[1],$matches[2])");
 926                 }
 927
 928                 echo "<li>Table interwiki successfully populated</li>\n";
 929         }
 930
 931         function strencode($s) {
 932                 return str_replace("'", "''", $s);
 933         }
 934
 935         function encodeBlob($b) {
 936                 return new ORABlob($b);
 937         }
 938         function decodeBlob($b) {
 939                 return $b; //return $b->load();
 940         }
 941
 942         function addQuotes( $s ) {
 943                 global $wgLang;
 944                 if (isset($wgLang->mLoaded) && $wgLang->mLoaded)
 945                         $s = $wgLang->checkTitleEncoding($s);
 946                 return "'" . $this->strencode($s) . "'";
 947         }
 948
 949         function quote_ident( $s ) {
 950                 return $s;
 951         }
 952
 953         /* For now, does nothing */
 954         function selectDB( $db ) {
 955                 return true;
 956         }
 957
 958         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
 959                 if (is_array($table))
 960                         foreach ($table as $tab)
 961                                 $tab = $this->tableName($tab);
 962                 else
 963                         $table = $this->tableName($table);
 964                 return parent::selectRow($table, $vars, $conds, $fname, $options, $join_conds);
 965         }
 966
 967         /**
 968          * Returns an optional USE INDEX clause to go after the table, and a
 969          * string to go at the end of the query
 970          *
 971          * @private
 972          *
 973          * @param $options Array: an associative array of options to be turned into
 974          *              an SQL query, valid keys are listed in the function.
 975          * @return array
 976          */
 977         function makeSelectOptions( $options ) {
 978                 $preLimitTail = $postLimitTail = '';
 979                 $startOpts = '';
 980
 981                 $noKeyOptions = array();
 982                 foreach ( $options as $key => $option ) {
 983                         if ( is_numeric( $key ) ) {
 984                                 $noKeyOptions[$option] = true;
 985                         }
 986                 }
 987
 988                 if ( isset( $options['GROUP BY'] ) ) $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
 989                 if ( isset( $options['ORDER BY'] ) ) $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
 990
 991                 #if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
 992                 #if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
 993                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
 994
 995                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
 996                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
 997                 } else {
 998                         $useIndex = '';
 999                 }
1000
1001                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1002         }
1003
1004         public function makeList( $a, $mode = LIST_COMMA ) {
1005                 if ( !is_array( $a ) ) {
1006                         throw new DBUnexpectedError( $this, 'DatabaseOracle::makeList called with incorrect parameters' );
1007                 }
1008                 $a2 = array();
1009                 foreach ($a as $key => $value) {
1010                         if (strpos($key, ' & ') !== FALSE)
1011                                 $a2[preg_replace('/(.*)\s&\s(.*)/', 'BITAND($1, $2)', $key)] = $value;
1012                         elseif (strpos($key, ' | ') !== FALSE)
1013                                 $a2[preg_replace('/(.*)\s|\s(.*)/', 'BITOR($1, $2)', $key)] = $value;
1014                         elseif (!is_array($value)) {
1015                                 if (strpos($value, ' = ') !== FALSE) {
1016                                         if (strpos($value, ' & ') !== FALSE)
1017                                                 $a2[$key] = preg_replace('/(.*)\s&\s(.*?)\s=\s(.*)/', 'BITAND($1, $2) = $3', $value);
1018                                         elseif (strpos($value, ' | ') !== FALSE)
1019                                                 $a2[$key] = preg_replace('/(.*)\s|\s(.*?)\s=\s(.*)/', 'BITOR($1, $2) = $3', $value);
1020                                         else $a2[$key] = $value;
1021                                 }
1022                                 elseif (strpos($value, ' & ') !== FALSE)
1023                                         $a2[$key] = preg_replace('/(.*)\s&\s(.*)/', 'BITAND($1, $2)', $value);
1024                                 elseif (strpos($value, ' | ') !== FALSE)
1025                                         $a2[$key] = preg_replace('/(.*)\s|\s(.*)/', 'BITOR($1, $2)', $value);
1026                                 else
1027                                         $a2[$key] = $value;
1028                         }
1029                         else
1030                                 $a2[$key] = $value;
1031                 }
1032
1033                 return parent::makeList($a2, $mode);
1034         }
1035
1036         public function setTimeout( $timeout ) {
1037                 // @todo fixme no-op
1038         }
1039
1040         function ping() {
1041                 wfDebug( "Function ping() not written for DatabaseOracle.php yet");
1042                 return true;
1043         }
1044
1045         /**
1046          * How lagged is this slave?
1047          *
1048          * @return int
1049          */
1050         public function getLag() {
1051                 # Not implemented for Oracle
1052                 return 0;
1053         }
1054
1055         function setFakeSlaveLag( $lag ) {}
1056         function setFakeMaster( $enabled = true ) {}
1057
1058         function getDBname() {
1059                 return $this->mDBname;
1060         }
1061
1062         function getServer() {
1063                 return $this->mServer;
1064         }
1065
1066         public function replaceVars( $ins ) {
1067                 $varnames = array('wgDBprefix');
1068                 if ($this->mFlags & DBO_SYSDBA) {
1069                         $varnames[] = 'wgDBOracleDefTS';
1070                         $varnames[] = 'wgDBOracleTempTS';
1071                 }
1072
1073                 // Ordinary variables
1074                 foreach ( $varnames as $var ) {
1075                         if( isset( $GLOBALS[$var] ) ) {
1076                                 $val = addslashes( $GLOBALS[$var] ); // FIXME: safety check?
1077                                 $ins = str_replace( '{$' . $var . '}', $val, $ins );
1078                                 $ins = str_replace( '/*$' . $var . '*/`', '`' . $val, $ins );
1079                                 $ins = str_replace( '/*$' . $var . '*/', $val, $ins );
1080                         }
1081                 }
1082
1083                 return parent::replaceVars($ins);
1084         }
1085
1086         /**
1087          * No-op lock functions
1088          */
1089         public function lock( $lockName, $method ) {
1090                 return true;
1091         }
1092         public function unlock( $lockName, $method ) {
1093                 return true;
1094         }
1095
1096         public function getSearchEngine() {
1097                 return "SearchOracle";
1098         }
1099
1100         /** No-op */
1101         public function setBigSelects( $value = true ) {}
1102
1103 } // end DatabaseOracle class