includes/DatabaseOracle.php

   1 <?php
   2
   3 /**
   4  * Oracle.
   5  *
   6  * @package MediaWiki
   7  */
   8
   9 /**
  10  * Depends on database
  11  */
  12 require_once( 'Database.php' );
  13
  14 class OracleBlob extends DBObject {
  15         function isLOB() {
  16                 return true;
  17         }
  18         function data() {
  19                 return $this->mData;
  20         }
  21 };
  22
  23 /**
  24  *
  25  * @package MediaWiki
  26  */
  27 class DatabaseOracle extends Database {
  28         var $mInsertId = NULL;
  29         var $mLastResult = NULL;
  30         var $mFetchCache = array();
  31         var $mFetchID = array();
  32         var $mNcols = array();
  33         var $mFieldNames = array(), $mFieldTypes = array();
  34         var $mAffectedRows = array();
  35         var $mErr;
  36
  37         function DatabaseOracle($server = false, $user = false, $password = false, $dbName = false,
  38                 $failFunction = false, $flags = 0, $tablePrefix = 'get from global' )
  39         {
  40                 Database::Database( $server, $user, $password, $dbName, $failFunction, $flags, $tablePrefix );
  41         }
  42
  43         /* static */ function newFromParams( $server = false, $user = false, $password = false, $dbName = false,
  44                 $failFunction = false, $flags = 0, $tablePrefix = 'get from global' )
  45         {
  46                 return new DatabaseOracle( $server, $user, $password, $dbName, $failFunction, $flags, $tablePrefix );
  47         }
  48
  49         /**
  50          * Usually aborts on failure
  51          * If the failFunction is set to a non-zero integer, returns success
  52          */
  53         function open( $server, $user, $password, $dbName ) {
  54                 if ( !function_exists( 'oci_connect' ) ) {
  55                         die( "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n" );
  56                 }
  57                 $this->close();
  58                 $this->mServer = $server;
  59                 $this->mUser = $user;
  60                 $this->mPassword = $password;
  61                 $this->mDBname = $dbName;
  62
  63                 $success = false;
  64
  65                 $hstring="";
  66                 $this->mConn = oci_new_connect($user, $password, $dbName, "AL32UTF8");
  67                 if ( $this->mConn === false ) {
  68                         wfDebug( "DB connection error\n" );
  69                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: "
  70                                 . substr( $password, 0, 3 ) . "...\n" );
  71                         wfDebug( $this->lastError()."\n" );
  72                 } else {
  73                         $this->mOpened = true;
  74                 }
  75                 return $this->mConn;
  76         }
  77
  78         /**
  79          * Closes a database connection, if it is open
  80          * Returns success, true if already closed
  81          */
  82         function close() {
  83                 $this->mOpened = false;
  84                 if ($this->mConn) {
  85                         return oci_close($this->mConn);
  86                 } else {
  87                         return true;
  88                 }
  89         }
  90
  91         function parseStatement($sql) {
  92                 $this->mErr = $this->mLastResult = false;
  93                 if (($stmt = oci_parse($this->mConn, $sql)) === false) {
  94                         $this->lastError();
  95                         return $this->mLastResult = false;
  96                 }
  97                 $this->mAffectedRows[$stmt] = 0;
  98                 return $this->mLastResult = $stmt;
  99         }
 100
 101         function doQuery($sql) {
 102                 if (($stmt = $this->parseStatement($sql)) === false)
 103                         return false;
 104                 return $this->executeStatement($stmt);
 105         }
 106
 107         function executeStatement($stmt) {
 108                 if (!oci_execute($stmt, OCI_DEFAULT)) {
 109                         $this->lastError();
 110                         oci_free_statement($stmt);
 111                         return false;
 112                 }
 113                 $this->mAffectedRows[$stmt] = oci_num_rows($stmt);
 114                 $this->mFetchCache[$stmt] = array();
 115                 $this->mFetchID[$stmt] = 0;
 116                 $this->mNcols[$stmt] = oci_num_fields($stmt);
 117                 if ($this->mNcols[$stmt] == 0)
 118                         return $this->mLastResult;
 119                 for ($i = 1; $i <= $this->mNcols[$stmt]; $i++) {
 120                         $this->mFieldNames[$stmt][$i] = oci_field_name($stmt, $i);
 121                         $this->mFieldTypes[$stmt][$i] = oci_field_type($stmt, $i);
 122                 }
 123                 while (($o = oci_fetch_array($stmt)) !== false) {
 124                         foreach ($o as $key => $value) {
 125                                 if (is_object($value)) {
 126                                         $o[$key] = $value->load();
 127                                 }
 128                         }
 129                         $this->mFetchCache[$stmt][] = $o;
 130                 }
 131                 return $this->mLastResult;
 132         }
 133
 134         function queryIgnore( $sql, $fname = '' ) {
 135                 return $this->query( $sql, $fname, true );
 136         }
 137
 138         function freeResult( $res ) {
 139                 if (!oci_free_statement($res)) {
 140                         wfDebugDieBacktrace( "Unable to free Oracle result\n" );
 141                 }
 142                 unset($this->mFetchID[$res]);
 143                 unset($this->mFetchCache[$res]);
 144                 unset($this->mNcols[$res]);
 145                 unset($this->mFieldNames[$res]);
 146                 unset($this->mFieldTypes[$res]);
 147         }
 148
 149         function fetchAssoc($res) {
 150                 if ($this->mFetchID[$res] >= count($this->mFetchCache[$res]))
 151                         return false;
 152
 153                 for ($i = 1; $i <= $this->mNcols[$res]; $i++) {
 154                         $name = $this->mFieldNames[$res][$i];
 155                         $type = $this->mFieldTypes[$res][$i];
 156                         if (isset($this->mFetchCache[$res][$this->mFetchID[$res]][$name]))
 157                                 $value = $this->mFetchCache[$res][$this->mFetchID[$res]][$name];
 158                         else    $value = NULL;
 159                         $key = strtolower($name);
 160                         wfdebug("'$key' => '$value'\n");
 161                         $ret[$key] = $value;
 162                 }
 163                 $this->mFetchID[$res]++;
 164                 return $ret;
 165         }
 166
 167         function fetchRow($res) {
 168                 $r = $this->fetchAssoc($res);
 169                 if (!$r)
 170                         return false;
 171                 $i = 0;
 172                 $ret = array();
 173                 foreach ($r as $key => $value) {
 174                         wfdebug("ret[$i]=[$value]\n");
 175                         $ret[$i++] = $value;
 176                 }
 177                 return $ret;
 178         }
 179
 180         function fetchObject($res) {
 181                 $row = $this->fetchAssoc($res);
 182                 if (!$row)
 183                         return false;
 184                 $ret = new stdClass;
 185                 foreach ($row as $key => $value)
 186                         $ret->$key = $value;
 187                 return $ret;
 188         }
 189
 190         function numRows($res) {
 191                 return count($this->mFetchCache[$res]);
 192         }
 193         function numFields( $res ) { return pg_num_fields( $res ); }
 194         function fieldName( $res, $n ) { return pg_field_name( $res, $n ); }
 195
 196         /**
 197          * This must be called after nextSequenceVal
 198          */
 199         function insertId() {
 200                 return $this->mInsertId;
 201         }
 202
 203         function dataSeek($res, $row) {
 204                 $this->mFetchID[$res] = $row;
 205         }
 206
 207         function lastError() {
 208                 if ($this->mErr === false) {
 209                         if ($this->mLastResult !== false) $what = $this->mLastResult;
 210                         else if ($this->mConn !== false) $what = $this->mConn;
 211                         else $what = false;
 212                         $err = ($what !== false) ? oci_error($what) : oci_error();
 213                         if ($err === false)
 214                                 $this->mErr = 'no error';
 215                         else
 216                                 $this->mErr = $err['message'];
 217                 }
 218                 return str_replace("\n", '<br />', $this->mErr);
 219         }
 220         function lastErrno() {
 221                 return 0;
 222         }
 223
 224         function affectedRows() {
 225                 return $this->mAffectedRows[$this->mLastResult];
 226         }
 227
 228         /**
 229          * Returns information about an index
 230          * If errors are explicitly ignored, returns NULL on failure
 231          */
 232         function indexInfo ($table, $index, $fname = 'Database::indexInfo' ) {
 233                 $table = $this->tableName($table, true);
 234                 if ($index == 'PRIMARY')
 235                         $index = "${table}_pk";
 236                 $sql = "SELECT uniqueness FROM all_indexes WHERE table_name='" .
 237                         $table . "' AND index_name='" .
 238                         $this->strencode(strtoupper($index)) . "'";
 239                 $res = $this->query($sql, $fname);
 240                 if (!$res)
 241                         return NULL;
 242                 if (($row = $this->fetchObject($res)) == NULL)
 243                         return false;
 244                 $this->freeResult($res);
 245                 $row->Non_unique = !$row->uniqueness;
 246                 return $row;
 247         }
 248
 249         function indexUnique ($table, $index, $fname = 'indexUnique') {
 250                 if (!($i = $this->indexInfo($table, $index, $fname)))
 251                         return $i;
 252                 return $i->uniqueness == 'UNIQUE';
 253         }
 254
 255         function fieldInfo( $table, $field ) {
 256                 $o = new stdClass;
 257                 $o->multiple_key = true; /* XXX */
 258                 return $o;
 259         }
 260
 261         function getColumnInformation($table, $field) {
 262                 $table = $this->tableName($table, true);
 263                 $field = strtoupper($field);
 264
 265                 $res = $this->doQuery("SELECT * FROM all_tab_columns " .
 266                         "WHERE table_name='".$table."' " .
 267                         "AND   column_name='".$field."'");
 268                 if (!$res)
 269                         return false;
 270                 $o = $this->fetchObject($res);
 271                 $this->freeResult($res);
 272                 return $o;
 273         }
 274
 275         function fieldExists( $table, $field, $fname = 'Database::fieldExists' ) {
 276                 $column = $this->getColumnInformation($table, $field);
 277                 if (!$column)
 278                         return false;
 279                 return true;
 280         }
 281
 282         /** @todo FIXME */
 283         function startTimer( $timeout ) {
 284                 wfDebugDieBacktrace( 'Database::startTimer() error : mysql_thread_id() not implemented for postgre' );
 285                 /*$tid = mysql_thread_id( $this->mConn );
 286                 exec( "php $IP/killthread.php $timeout $tid &>/dev/null &" );*/
 287         }
 288
 289         /** */
 290         function tableName($name, $forddl = false) {
 291                 # First run any transformations from the parent object
 292                 $name = parent::tableName( $name );
 293
 294                 # Replace backticks into empty
 295                 # Note: "foo" and foo are not the same in Oracle!
 296                 $name = str_replace('`', '', $name);
 297
 298                 # Now quote Oracle reserved keywords
 299                 switch( $name ) {
 300                         case 'user':
 301                         case 'group':
 302                         case 'validate':
 303                                 if ($forddl)
 304                                         return $name;
 305                                 else
 306                                         return '"' . $name . '"';
 307
 308                         default:
 309                                 return strtoupper($name);
 310                 }
 311         }
 312
 313         function strencode( $s ) {
 314                 return str_replace("'", "''", $s);
 315         }
 316
 317         /**
 318          * Return the next in a sequence, save the value for retrieval via insertId()
 319          */
 320         function nextSequenceValue( $seqName ) {
 321                 $r = $this->doQuery("SELECT $seqName.nextval AS val FROM dual");
 322                 $o = $this->fetchObject($r);
 323                 $this->freeResult($r);
 324                 return $this->mInsertId = (int)$o->val;
 325         }
 326
 327         /**
 328          * USE INDEX clause
 329          * PostgreSQL doesn't have them and returns ""
 330          */
 331         function useIndexClause( $index ) {
 332                 return '';
 333         }
 334
 335         # REPLACE query wrapper
 336         # PostgreSQL simulates this with a DELETE followed by INSERT
 337         # $row is the row to insert, an associative array
 338         # $uniqueIndexes is an array of indexes. Each element may be either a
 339         # field name or an array of field names
 340         #
 341         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 342         # However if you do this, you run the risk of encountering errors which wouldn't have
 343         # occurred in MySQL
 344         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 345                 $table = $this->tableName( $table );
 346
 347                 if (count($rows)==0) {
 348                         return;
 349                 }
 350
 351                 # Single row case
 352                 if ( !is_array( reset( $rows ) ) ) {
 353                         $rows = array( $rows );
 354                 }
 355
 356                 foreach( $rows as $row ) {
 357                         # Delete rows which collide
 358                         if ( $uniqueIndexes ) {
 359                                 $sql = "DELETE FROM $table WHERE ";
 360                                 $first = true;
 361                                 foreach ( $uniqueIndexes as $index ) {
 362                                         if ( $first ) {
 363                                                 $first = false;
 364                                                 $sql .= "(";
 365                                         } else {
 366                                                 $sql .= ') OR (';
 367                                         }
 368                                         if ( is_array( $index ) ) {
 369                                                 $first2 = true;
 370                                                 foreach ( $index as $col ) {
 371                                                         if ( $first2 ) {
 372                                                                 $first2 = false;
 373                                                         } else {
 374                                                                 $sql .= ' AND ';
 375                                                         }
 376                                                         $sql .= $col.'=' . $this->addQuotes( $row[$col] );
 377                                                 }
 378                                         } else {
 379                                                 $sql .= $index.'=' . $this->addQuotes( $row[$index] );
 380                                         }
 381                                 }
 382                                 $sql .= ')';
 383                                 $this->query( $sql, $fname );
 384                         }
 385
 386                         # Now insert the row
 387                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) .') VALUES (' .
 388                                 $this->makeList( $row, LIST_COMMA ) . ')';
 389                         $this->query( $sql, $fname );
 390                 }
 391         }
 392
 393         # DELETE where the condition is a join
 394         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 395                 if ( !$conds ) {
 396                         wfDebugDieBacktrace( 'Database::deleteJoin() called with empty $conds' );
 397                 }
 398
 399                 $delTable = $this->tableName( $delTable );
 400                 $joinTable = $this->tableName( $joinTable );
 401                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 402                 if ( $conds != '*' ) {
 403                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 404                 }
 405                 $sql .= ')';
 406
 407                 $this->query( $sql, $fname );
 408         }
 409
 410         # Returns the size of a text field, or -1 for "unlimited"
 411         function textFieldSize( $table, $field ) {
 412                 $table = $this->tableName( $table );
 413                 $sql = "SELECT t.typname as ftype,a.atttypmod as size
 414                         FROM pg_class c, pg_attribute a, pg_type t
 415                         WHERE relname='$table' AND a.attrelid=c.oid AND
 416                                 a.atttypid=t.oid and a.attname='$field'";
 417                 $res =$this->query($sql);
 418                 $row=$this->fetchObject($res);
 419                 if ($row->ftype=="varchar") {
 420                         $size=$row->size-4;
 421                 } else {
 422                         $size=$row->size;
 423                 }
 424                 $this->freeResult( $res );
 425                 return $size;
 426         }
 427
 428         function lowPriorityOption() {
 429                 return '';
 430         }
 431
 432         function limitResult($sql, $limit, $offset) {
 433                 $ret = "SELECT * FROM ($sql) WHERE ROWNUM < " . ((int)$limit + (int)($offset+1));
 434                 if (is_numeric($offset))
 435                         $ret .= " AND ROWNUM >= " . (int)$offset;
 436                 return $ret;
 437         }
 438         function limitResultForUpdate($sql, $limit) {
 439                 return $sql;
 440         }
 441         /**
 442          * Returns an SQL expression for a simple conditional.
 443          * Uses CASE on PostgreSQL.
 444          *
 445          * @param string $cond SQL expression which will result in a boolean value
 446          * @param string $trueVal SQL expression to return if true
 447          * @param string $falseVal SQL expression to return if false
 448          * @return string SQL fragment
 449          */
 450         function conditional( $cond, $trueVal, $falseVal ) {
 451                 return " (CASE WHEN $cond THEN $trueVal ELSE $falseVal END) ";
 452         }
 453
 454         # FIXME: actually detecting deadlocks might be nice
 455         function wasDeadlock() {
 456                 return false;
 457         }
 458
 459         # Return DB-style timestamp used for MySQL schema
 460         function timestamp($ts = 0) {
 461                 return $this->strencode(wfTimestamp(TS_ORACLE, $ts));
 462 #               return "TO_TIMESTAMP('" . $this->strencode(wfTimestamp(TS_DB, $ts)) . "', 'RRRR-MM-DD HH24:MI:SS')";
 463         }
 464
 465         /**
 466          * Return aggregated value function call
 467          */
 468         function aggregateValue ($valuedata,$valuename='value') {
 469                 return $valuedata;
 470         }
 471
 472
 473         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 474                 $message = "A database error has occurred\n" .
 475                         "Query: $sql\n" .
 476                         "Function: $fname\n" .
 477                         "Error: $errno $error\n";
 478                 wfDebugDieBacktrace($message);
 479         }
 480
 481         /**
 482          * @return string wikitext of a link to the server software's web site
 483          */
 484         function getSoftwareLink() {
 485                 return "[http://www.oracle.com/ Oracle]";
 486         }
 487
 488         /**
 489          * @return string Version information from the database
 490          */
 491         function getServerVersion() {
 492                 return oci_server_version($this->mConn);
 493         }
 494
 495         function setSchema($schema=false) {
 496                 $schemas=$this->mSchemas;
 497                 if ($schema) { array_unshift($schemas,$schema); }
 498                 $searchpath=$this->makeList($schemas,LIST_NAMES);
 499                 $this->query("SET search_path = $searchpath");
 500         }
 501
 502         function begin() {
 503         }
 504
 505         function immediateCommit( $fname = 'Database::immediateCommit' ) {
 506                 oci_commit($this->mConn);
 507                 $this->mTrxLevel = 0;
 508         }
 509         function rollback( $fname = 'Database::rollback' ) {
 510                 oci_rollback($this->mConn);
 511                 $this->mTrxLevel = 0;
 512         }
 513         function getLag() {
 514                 return false;
 515         }
 516         function getStatus() {
 517                 $result = array('Threads_running' => 0, 'Threads_connected' => 0);
 518                 return $result;
 519         }
 520
 521         /**
 522          * Returns an optional USE INDEX clause to go after the table, and a
 523          * string to go at the end of the query
 524          *
 525          * @access private
 526          *
 527          * @param array $options an associative array of options to be turned into
 528          *              an SQL query, valid keys are listed in the function.
 529          * @return array
 530          */
 531         function makeSelectOptions($options) {
 532                 $tailOpts = '';
 533
 534                 if (isset( $options['ORDER BY'])) {
 535                         $tailOpts .= " ORDER BY {$options['ORDER BY']}";
 536                 }
 537
 538                 return array('', $tailOpts);
 539         }
 540
 541         function maxListLen() {
 542                 return 1000;
 543         }
 544
 545         /**
 546          * Query whether a given table exists
 547          */
 548         function tableExists( $table ) {
 549                 $table = $this->tableName($table, true);
 550                 $res = $this->query( "SELECT COUNT(*) as NUM FROM user_tables WHERE table_name='"
 551                         . $table . "'" );
 552                 if (!$res)
 553                         return false;
 554                 $row = $this->fetchObject($res);
 555                 $this->freeResult($res);
 556                 return $row->num >= 1;
 557         }
 558
 559         /**
 560          * UPDATE wrapper, takes a condition array and a SET array
 561          */
 562         function update( $table, $values, $conds, $fname = 'Database::update' ) {
 563                 $table = $this->tableName( $table );
 564
 565                 $sql = "UPDATE $table SET ";
 566                 $first = true;
 567                 foreach ($values as $field => $v) {
 568                         if ($first)
 569                                 $first = false;
 570                         else
 571                                 $sql .= ", ";
 572                         $sql .= "$field = :n$field ";
 573                 }
 574                 if ( $conds != '*' ) {
 575                         $sql .= " WHERE " . $this->makeList( $conds, LIST_AND );
 576                 }
 577                 $stmt = $this->parseStatement($sql);
 578                 if ($stmt === false) {
 579                         $this->reportQueryError( $this->lastError(), $this->lastErrno(), $stmt );
 580                         return false;
 581                 }
 582                 if ($this->debug())
 583                         wfDebug("SQL: $sql\n");
 584                 $s = '';
 585                 foreach ($values as $field => $v) {
 586                         oci_bind_by_name($stmt, ":n$field", $values[$field]);
 587                         if ($this->debug())
 588                                 $s .= " [$field] = [$v]\n";
 589                 }
 590                 if ($this->debug())
 591                         wfdebug(" PH: $s\n");
 592                 $ret = $this->executeStatement($stmt);
 593                 return $ret;
 594         }
 595
 596         /**
 597          * INSERT wrapper, inserts an array into a table
 598          *
 599          * $a may be a single associative array, or an array of these with numeric keys, for
 600          * multi-row insert.
 601          *
 602          * Usually aborts on failure
 603          * If errors are explicitly ignored, returns success
 604          */
 605         function insert( $table, $a, $fname = 'Database::insert', $options = array() ) {
 606                 # No rows to insert, easy just return now
 607                 if ( !count( $a ) ) {
 608                         return true;
 609                 }
 610
 611                 $table = $this->tableName( $table );
 612                 if (!is_array($options))
 613                         $options = array($options);
 614
 615                 $oldIgnore = false;
 616                 if (in_array('IGNORE', $options))
 617                         $oldIgnore = $this->ignoreErrors( true );
 618
 619                 if ( isset( $a[0] ) && is_array( $a[0] ) ) {
 620                         $multi = true;
 621                         $keys = array_keys( $a[0] );
 622                 } else {
 623                         $multi = false;
 624                         $keys = array_keys( $a );
 625                 }
 626
 627                 $sql = "INSERT INTO $table (" . implode( ',', $keys ) . ') VALUES (';
 628                 $return = '';
 629                 $first = true;
 630                 foreach ($a as $key => $value) {
 631                         if ($first)
 632                                 $first = false;
 633                         else
 634                                 $sql .= ", ";
 635                         if (is_object($value) && $value->isLOB()) {
 636                                 $sql .= "EMPTY_BLOB()";
 637                                 $return = "RETURNING $key INTO :bobj";
 638                         } else
 639                                 $sql .= ":$key";
 640                 }
 641                 $sql .= ") $return";
 642
 643                 if ($this->debug()) {
 644                         wfDebug("SQL: $sql\n");
 645                 }
 646
 647                 if (($stmt = $this->parseStatement($sql)) === false) {
 648                         $this->reportQueryError($this->lastError(), $this->lastErrno(), $sql, $fname);
 649                         $this->ignoreErrors($oldIgnore);
 650                         return false;
 651                 }
 652
 653                 /*
 654                  * If we're inserting multiple rows, parse the statement once and
 655                  * execute it for each set of values.  Otherwise, convert it into an
 656                  * array and pretend.
 657                  */
 658                 if (!$multi)
 659                         $a = array($a);
 660
 661                 foreach ($a as $key => $row) {
 662                         $blob = false;
 663                         $bdata = false;
 664                         $s = '';
 665                         foreach ($row as $k => $value) {
 666                                 if (is_object($value) && $value->isLOB()) {
 667                                         $blob = oci_new_descriptor($this->mConn, OCI_D_LOB);
 668                                         $bdata = $value->data();
 669                                         oci_bind_by_name($stmt, ":bobj", &$blob, -1, OCI_B_BLOB);
 670                                 } else
 671                                         oci_bind_by_name($stmt, ":$k", $a[$key][$k], -1);
 672                                 if ($this->debug())
 673                                         $s .= " [$k] = {$row[$k]}";
 674                         }
 675                         if ($this->debug())
 676                                 wfDebug(" PH: $s\n");
 677                         if (($s = $this->executeStatement($stmt)) === false) {
 678                                 $this->reportQueryError($this->lastError(), $this->lastErrno(), $sql, $fname);
 679                                 $this->ignoreErrors($oldIgnore);
 680                                 return false;
 681                         }
 682
 683                         if ($blob) {
 684                                 $blob->save($bdata);
 685                         }
 686                 }
 687                 $this->ignoreErrors($oldIgnore);
 688                 return $this->mLastResult = $s;
 689         }
 690
 691         function ping() {
 692                 return true;
 693         }
 694
 695         function encodeBlob($b) {
 696                 return new OracleBlob($b);
 697         }
 698 }
 699
 700 ?>