includes/db/DatabaseMssql.php

   1 <?php
   2
   3 /**
   4  * This is the MS SQL Server Native database abstraction layer.
   5  *
   6  * @addtogroup Database
   7  * @author Joel Penner <a-joelpe at microsoft dot com>
   8  * @author Chris Pucci <a-cpucci at microsoft dot com>
   9  * @author Ryan Biesemeyer <v-ryanbi at microsoft dot com>
  10  */
  11
  12 /**
  13  * @addtogroup Database
  14  */
  15 class DatabaseMssql extends DatabaseBase {
  16         var $mInsertId = NULL;
  17         var $mLastResult = NULL;
  18         var $mAffectedRows = NULL;
  19
  20         function __construct( $server = false, $user = false, $password = false, $dbName = false,
  21                 $failFunction = false, $flags = 0 )
  22         {
  23                 $this->mFailFunction = $failFunction;
  24                 $this->mFlags = $flags;
  25                 $this->open( $server, $user, $password, $dbName );
  26
  27         }
  28
  29         function cascadingDeletes() {
  30                 return true;
  31         }
  32         function cleanupTriggers() {
  33                 return true;
  34         }
  35         function strictIPs() {
  36                 return true;
  37         }
  38         function realTimestamps() {
  39                 return true;
  40         }
  41         function implicitGroupby() {
  42                 return false;
  43         }
  44         function implicitOrderby() {
  45                 return false;
  46         }
  47         function functionalIndexes() {
  48                 return true;
  49         }
  50         function unionSupportsOrderAndLimit() {
  51                 return false;
  52         }
  53
  54         static function newFromParams( $server, $user, $password, $dbName, $failFunction = false, $flags = 0 )
  55         {
  56                 return new DatabaseMssql( $server, $user, $password, $dbName, $failFunction, $flags );
  57         }
  58
  59         /**
  60          * Usually aborts on failure
  61          * If the failFunction is set to a non-zero integer, returns success
  62          */
  63         function open( $server, $user, $password, $dbName ) {
  64                 # Test for driver support, to avoid suppressed fatal error
  65                 if ( !function_exists( 'sqlsrv_connect' ) ) {
  66                         throw new DBConnectionError( $this, "MS Sql Server Native (sqlsrv) functions missing. You can download the driver from: http://go.microsoft.com/fwlink/?LinkId=123470\n" );
  67                 }
  68
  69                 global $wgDBport;
  70
  71                 if ( !strlen( $user ) ) { # # e.g. the class is being loaded
  72                         return;
  73                 }
  74
  75                 $this->close();
  76                 $this->mServer = $server;
  77                 $this->mPort = $port = $wgDBport;
  78                 $this->mUser = $user;
  79                 $this->mPassword = $password;
  80                 $this->mDBname = $dbName;
  81
  82                 $connectionInfo = array();
  83
  84                 if( $dbName ) {
  85                         $connectionInfo['Database'] = $dbName;
  86                 }
  87
  88                 // Start NT Auth Hack
  89                 // Quick and dirty work around to provide NT Auth designation support.
  90                 // Current solution requires installer to know to input 'ntauth' for both username and password
  91                 // to trigger connection via NT Auth. - ugly, ugly, ugly
  92                 // TO-DO: Make this better and add NT Auth choice to MW installer when SQL Server option is chosen.
  93                 $ntAuthUserTest = strtolower( $user );
  94                 $ntAuthPassTest = strtolower( $password );
  95
  96                 // Decide which auth scenerio to use
  97                 if( ( $ntAuthPassTest == 'ntauth' && $ntAuthUserTest == 'ntauth' ) ){
  98                         // Don't add credentials to $connectionInfo
  99                 } else {
 100                         $connectionInfo['UID'] = $user;
 101                         $connectionInfo['PWD'] = $password;
 102                 }
 103                 // End NT Auth Hack
 104
 105                 $this->mConn = @sqlsrv_connect( $server, $connectionInfo );
 106
 107                 if ( $this->mConn === false ) {
 108                         wfDebug( "DB connection error\n" );
 109                         wfDebug( "Server: $server, Database: $dbName, User: $user, Password: " . substr( $password, 0, 3 ) . "...\n" );
 110                         wfDebug( $this->lastError() . "\n" );
 111                         return false;
 112                 }
 113
 114                 $this->mOpened = true;
 115                 return $this->mConn;
 116         }
 117
 118         /**
 119          * Closes a database connection, if it is open
 120          * Returns success, true if already closed
 121          */
 122         function close() {
 123                 $this->mOpened = false;
 124                 if ( $this->mConn ) {
 125                         return sqlsrv_close( $this->mConn );
 126                 } else {
 127                         return true;
 128                 }
 129         }
 130
 131         function doQuery( $sql ) {
 132                 wfDebug( "SQL: [$sql]\n" );
 133                 $this->offset = 0;
 134
 135                 // several extensions seem to think that all databases support limits via LIMIT N after the WHERE clause
 136                 // well, MSSQL uses SELECT TOP N, so to catch any of those extensions we'll do a quick check for a LIMIT
 137                 // clause and pass $sql through $this->LimitToTopN() which parses the limit clause and passes the result to
 138                 // $this->limitResult();
 139                 if ( preg_match( '/\bLIMIT\s*/i', $sql ) ) {
 140                         // massage LIMIT -> TopN
 141                         $sql = $this->LimitToTopN( $sql ) ;
 142                 }
 143
 144                 // MSSQL doesn't have EXTRACT(epoch FROM XXX)
 145                 if ( preg_match('#\bEXTRACT\s*?\(\s*?EPOCH\s+FROM\b#i', $sql, $matches ) ) {
 146                         // This is same as UNIX_TIMESTAMP, we need to calc # of seconds from 1970
 147                         $sql = str_replace( $matches[0], "DATEDIFF(s,CONVERT(datetime,'1/1/1970'),", $sql );
 148                 }
 149
 150                 // perform query
 151                 $stmt = sqlsrv_query( $this->mConn, $sql );
 152                 if ( $stmt == false ) {
 153                         $message = "A database error has occurred\n" .
 154                                 "Query: " . htmlentities( $sql ) . "\n" .
 155                                 "Function: " . __FUNCTION__ . "\n";
 156                         // process each error (our driver will give us an array of errors unlike other providers)
 157                         foreach ( sqlsrv_errors() as $error ) {
 158                                 $message .= $message . "ERROR[" . $error['code'] . "] " . $error['message'] . "\n";
 159                         }
 160
 161                         throw new DBUnexpectedError( $this, $message );
 162                 }
 163                 // remember number of rows affected
 164                 $this->mAffectedRows = sqlsrv_rows_affected( $stmt );
 165
 166                 // if it is a SELECT statement, or an insert with a request to output something we want to return a row.
 167                 if ( ( preg_match( '#\bSELECT\s#i', $sql ) ) ||
 168                         ( preg_match( '#\bINSERT\s#i', $sql ) && preg_match( '#\bOUTPUT\s+INSERTED\b#i', $sql ) ) ) {
 169                         // this is essentially a rowset, but Mediawiki calls these 'result'
 170                         // the rowset owns freeing the statement
 171                         $res = new MssqlResult( $stmt );
 172                 } else {
 173                         // otherwise we simply return it was successful, failure throws an exception
 174                         $res = true;
 175                 }
 176                 return $res;
 177         }
 178
 179         function freeResult( $res ) {
 180                 if ( $res instanceof ResultWrapper ) {
 181                         $res = $res->result;
 182                 }
 183                 $res->free();
 184         }
 185
 186         function fetchObject( $res ) {
 187                 if ( $res instanceof ResultWrapper ) {
 188                         $res = $res->result;
 189                 }
 190                 $row = $res->fetch( 'OBJECT' );
 191                 return $row;
 192         }
 193
 194         function getErrors() {
 195                 $strRet = '';
 196                 $retErrors = sqlsrv_errors( SQLSRV_ERR_ALL );
 197                 if ( $retErrors != null ) {
 198                         foreach ( $retErrors as $arrError ) {
 199                                 $strRet .= "SQLState: " . $arrError[ 'SQLSTATE'] . "\n";
 200                                 $strRet .= "Error Code: " . $arrError[ 'code'] . "\n";
 201                                 $strRet .= "Message: " . $arrError[ 'message'] . "\n";
 202                         }
 203                 } else {
 204                         $strRet = "No errors found";
 205                 }
 206                 return $strRet;
 207         }
 208
 209         function fetchRow( $res ) {
 210                 if ( $res instanceof ResultWrapper ) {
 211                         $res = $res->result;
 212                 }
 213                 $row = $res->fetch( SQLSRV_FETCH_BOTH );
 214                 return $row;
 215         }
 216
 217         function numRows( $res ) {
 218                 if ( $res instanceof ResultWrapper ) {
 219                         $res = $res->result;
 220                 }
 221                 return ( $res ) ? $res->numrows() : 0;
 222         }
 223
 224         function numFields( $res ) {
 225                 if ( $res instanceof ResultWrapper ) {
 226                         $res = $res->result;
 227                 }
 228                 return ( $res ) ? $res->numfields() : 0;
 229         }
 230
 231         function fieldName( $res, $n ) {
 232                 if ( $res instanceof ResultWrapper ) {
 233                         $res = $res->result;
 234                 }
 235                 return ( $res ) ? $res->fieldname( $n ) : 0;
 236         }
 237
 238         /**
 239          * This must be called after nextSequenceVal
 240          */
 241         function insertId() {
 242                 return $this->mInsertId;
 243         }
 244
 245         function dataSeek( $res, $row ) {
 246                 if ( $res instanceof ResultWrapper ) {
 247                         $res = $res->result;
 248                 }
 249                 return ( $res ) ? $res->seek( $row ) : false;
 250         }
 251
 252         function lastError() {
 253                 if ( $this->mConn ) {
 254                         return $this->getErrors();
 255                 }
 256                 else {
 257                         return "No database connection";
 258                 }
 259         }
 260
 261         function lastErrno() {
 262                 $err = sqlsrv_errors( SQLSRV_ERR_ALL );
 263                 if ( $err[0] ) return $err[0]['code'];
 264                 else return 0;
 265         }
 266
 267         function affectedRows() {
 268                 return $this->mAffectedRows;
 269         }
 270
 271         /**
 272          * SELECT wrapper
 273          *
 274          * @param mixed  $table   Array or string, table name(s) (prefix auto-added)
 275          * @param mixed  $vars  Array or string, field name(s) to be retrieved
 276          * @param mixed  $conds   Array or string, condition(s) for WHERE
 277          * @param string $fname   Calling function name (use __METHOD__) for logs/profiling
 278          * @param array  $options Associative array of options (e.g. array('GROUP BY' => 'page_title')),
 279          *                                              see Database::makeSelectOptions code for list of supported stuff
 280          * @param $join_conds Array: Associative array of table join conditions (optional)
 281          *                                                 (e.g. array( 'page' => array('LEFT JOIN','page_latest=rev_id') )
 282          * @return mixed Database result resource (feed to Database::fetchObject or whatever), or false on failure
 283          */
 284         function select( $table, $vars, $conds = '', $fname = 'Database::select', $options = array(), $join_conds = array() )
 285         {
 286                 $sql = $this->selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds );
 287                 if ( isset( $options['EXPLAIN'] ) ) {
 288                         sqlsrv_query( $this->mConn, "SET SHOWPLAN_ALL ON;" );
 289                         return $this->query( $sql, $fname );
 290                         sqlsrv_query( $this->mConn, "SET SHOWPLAN_ALL OFF;" );
 291                 }
 292                 return $this->query( $sql, $fname );
 293         }
 294
 295         /**
 296          * SELECT wrapper
 297          *
 298          * @param $table   Mixed:  Array or string, table name(s) (prefix auto-added)
 299          * @param $vars Mixed:  Array or string, field name(s) to be retrieved
 300          * @param $conds   Mixed:  Array or string, condition(s) for WHERE
 301          * @param $fname   String: Calling function name (use __METHOD__) for logs/profiling
 302          * @param $options Array:  Associative array of options (e.g. array('GROUP BY' => 'page_title')),
 303          *                                               see Database::makeSelectOptions code for list of supported stuff
 304          * @param $join_conds Array: Associative array of table join conditions (optional)
 305          *                                                 (e.g. array( 'page' => array('LEFT JOIN','page_latest=rev_id') )
 306          * @return string, the SQL text
 307          */
 308         function selectSQLText( $table, $vars, $conds = '', $fname = 'Database::select', $options = array(), $join_conds = array() ) {
 309                 if ( isset( $options['EXPLAIN'] ) ) {
 310                         unset( $options['EXPLAIN'] );
 311                 }
 312                 return parent::selectSQLText(  $table, $vars, $conds, $fname, $options, $join_conds );
 313         }
 314
 315         /**
 316          * Estimate rows in dataset
 317          * Returns estimated count, based on SHOWPLAN_ALL output
 318          * This is not necessarily an accurate estimate, so use sparingly
 319          * Returns -1 if count cannot be found
 320          * Takes same arguments as Database::select()
 321          */
 322         function estimateRowCount( $table, $vars = '*', $conds = '', $fname = 'Database::estimateRowCount', $options = array() ) {
 323                 $options['EXPLAIN'] = true;// http://msdn2.microsoft.com/en-us/library/aa259203.aspx
 324                 $res = $this->select( $table, $vars, $conds, $fname, $options );
 325
 326                 $rows = -1;
 327                 if ( $res ) {
 328                         $row = $this->fetchRow( $res );
 329                         if ( isset( $row['EstimateRows'] ) ) $rows = $row['EstimateRows'];
 330                         $this->freeResult( $res );
 331                 }
 332                 return $rows;
 333         }
 334
 335
 336         /**
 337          * Returns information about an index
 338          * If errors are explicitly ignored, returns NULL on failure
 339          */
 340         function indexInfo( $table, $index, $fname = 'Database::indexExists' ) {
 341                 # This does not return the same info as MYSQL would, but that's OK because MediaWiki never uses the
 342                 # returned value except to check for the existance of indexes.
 343                 $sql = "sp_helpindex '" . $table . "'";
 344                 $res = $this->query( $sql, $fname );
 345                 if ( !$res ) {
 346                         return NULL;
 347                 }
 348
 349                 $result = array();
 350                 while ( $row = $res->FetchNextObj() ) {
 351                         if ( $row->index_name == $index ) {
 352                                 $row->Non_unique = !stristr( $row->index_description, "unique" );
 353                                 $cols = explode( ", ", $row->index_keys );
 354                                 foreach ( $cols as $col ) {
 355                                         $row->Column_name = trim( $col );
 356                                         $result[] = clone $row;
 357                                 }
 358                         } else if ( $index == 'PRIMARY' && stristr( $row->index_description, 'PRIMARY' ) ) {
 359                                 $row->Non_unique = 0;
 360                                 $cols = explode( ", ", $row->index_keys );
 361                                 foreach ( $cols as $col ) {
 362                                         $row->Column_name = trim( $col );
 363                                         $result[] = clone $row;
 364                                 }
 365                         }
 366                 }
 367                 return empty( $result ) ? false : $result;
 368         }
 369
 370         /**
 371          * INSERT wrapper, inserts an array into a table
 372          *
 373          * $arrToInsert may be a single associative array, or an array of these with numeric keys, for
 374          * multi-row insert.
 375          *
 376          * Usually aborts on failure
 377          * If errors are explicitly ignored, returns success
 378          */
 379         function insert( $table, $arrToInsert, $fname = 'Database::insert', $options = array() ) {
 380                 # No rows to insert, easy just return now
 381                 if ( !count( $arrToInsert ) ) {
 382                         return true;
 383                 }
 384
 385                 if ( !is_array( $options ) ) {
 386                         $options = array( $options );
 387                 }
 388
 389                 $table = $this->tableName( $table );
 390
 391                 if ( !( isset( $arrToInsert[0] ) && is_array( $arrToInsert[0] ) ) ) {// Not multi row
 392                         $arrToInsert = array( 0 => $arrToInsert );// make everything multi row compatible
 393                 }
 394
 395                 $allOk = true;
 396
 397
 398                 // We know the table we're inserting into, get its identity column
 399                 $identity = null;
 400                 $tableRaw = preg_replace( '#\[([^\]]*)\]#', '$1', $table ); // strip matching square brackets from table name
 401                 $res = $this->doQuery( "SELECT NAME AS idColumn FROM SYS.IDENTITY_COLUMNS WHERE OBJECT_NAME(OBJECT_ID)='{$tableRaw}'" );
 402                 if( $res && $res->numrows() ){
 403                         // There is an identity for this table.
 404                         $identity = array_pop( $res->fetch( SQLSRV_FETCH_ASSOC ) );
 405                 }
 406                 unset( $res );
 407
 408                 foreach ( $arrToInsert as $blah => $a ) {
 409                         // start out with empty identity column, this is so we can return it as a result of the insert logic
 410                         $sqlPre = '';
 411                         $sqlPost = '';
 412                         $identityClause = '';
 413
 414                         // if we have an identity column
 415                         if( $identity ) {
 416                                 // iterate through
 417                                 foreach ($a as $k => $v ) {
 418                                         if ( $k == $identity ) {
 419                                                 if( !is_null($v) ){
 420                                                         // there is a value being passed to us, we need to turn on and off inserted identity
 421                                                         $sqlPre = "SET IDENTITY_INSERT $table ON;" ;
 422                                                         $sqlPost = ";SET IDENTITY_INSERT $table OFF;";
 423
 424                                                 } else {
 425                                                         // we can't insert NULL into an identity column, so remove the column from the insert.
 426                                                         unset( $a[$k] );
 427                                                 }
 428                                         }
 429                                 }
 430                                 $identityClause = "OUTPUT INSERTED.$identity "; // we want to output an identity column as result
 431                         }
 432
 433                         $keys = array_keys( $a );
 434
 435
 436                         // INSERT IGNORE is not supported by SQL Server
 437                         // remove IGNORE from options list and set ignore flag to true
 438                         $ignoreClause = false;
 439                         foreach ( $options as $k => $v ) {
 440                                 if ( strtoupper( $v ) == "IGNORE" ) {
 441                                         unset( $options[$k] );
 442                                         $ignoreClause = true;
 443                                 }
 444                         }
 445
 446                         // translate MySQL INSERT IGNORE to something SQL Server can use
 447                         // example:
 448                         // MySQL: INSERT IGNORE INTO user_groups (ug_user,ug_group) VALUES ('1','sysop')
 449                         // MSSQL: IF NOT EXISTS (SELECT * FROM user_groups WHERE ug_user = '1') INSERT INTO user_groups (ug_user,ug_group) VALUES ('1','sysop')
 450                         if ( $ignoreClause == true ) {
 451                                 $prival = $a[$keys[0]];
 452                                 $sqlPre .= "IF NOT EXISTS (SELECT * FROM $table WHERE $keys[0] = '$prival')";
 453                         }
 454
 455                         // Build the actual query
 456                         $sql = $sqlPre . 'INSERT ' . implode( ' ', $options ) .
 457                                 " INTO $table (" . implode( ',', $keys ) . ") $identityClause VALUES (";
 458
 459                         $first = true;
 460                         foreach ( $a as $key => $value ) {
 461                                 if ( $first ) {
 462                                         $first = false;
 463                                 } else {
 464                                         $sql .= ',';
 465                                 }
 466                                 if ( is_string( $value ) ) {
 467                                         $sql .= $this->quote_ident( $value );
 468                                 } elseif ( is_null( $value ) ) {
 469                                         $sql .= 'null';
 470                                 } elseif ( is_array( $value ) || is_object( $value ) ) {
 471                                         if ( is_object( $value ) && strtolower( get_class( $value ) ) == 'blob' ) {
 472                                                 $sql .= $this->quote_ident( $value->fetch() );
 473                                         }  else {
 474                                                 $sql .= $this->quote_ident( serialize( $value ) );
 475                                         }
 476                                 } else {
 477                                         $sql .= $value;
 478                                 }
 479                         }
 480                         $sql .= ')' . $sqlPost;
 481
 482                         // Run the query
 483                         $ret = sqlsrv_query( $this->mConn, $sql );
 484
 485                         if ( $ret === false ) {
 486                                 throw new DBQueryError( $this, $this->getErrors(), $this->lastErrno(), $sql, $fname );
 487                         } elseif ( $ret != NULL ) {
 488                                 // remember number of rows affected
 489                                 $this->mAffectedRows = sqlsrv_rows_affected( $ret );
 490                                 if ( !is_null($identity) ) {
 491                                         // then we want to get the identity column value we were assigned and save it off
 492                                         $row = sqlsrv_fetch_object( $ret );
 493                                         $this->mInsertId = $row->$identity;
 494                                 }
 495                                 sqlsrv_free_stmt( $ret );
 496                                 continue;
 497                         }
 498                         $allOk = false;
 499                 }
 500                 return $allOk;
 501         }
 502
 503         /**
 504          * INSERT SELECT wrapper
 505          * $varMap must be an associative array of the form array( 'dest1' => 'source1', ...)
 506          * Source items may be literals rather than field names, but strings should be quoted with Database::addQuotes()
 507          * $conds may be "*" to copy the whole table
 508          * srcTable may be an array of tables.
 509          */
 510         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'Database::insertSelect',
 511                 $insertOptions = array(), $selectOptions = array() )
 512         {
 513                 $ret = parent::insertSelect( $destTable, $srcTable, $varMap, $conds, $fname, insertOptions, $selectOptions );
 514
 515                 if ( $ret === false ) {
 516                         throw new DBQueryError( $this, $this->getErrors(), $this->lastErrno(), $sql, $fname );
 517                 } elseif ( $ret != NULL ) {
 518                         // remember number of rows affected
 519                         $this->mAffectedRows = sqlsrv_rows_affected( $ret );
 520                         return $ret;
 521                 }
 522                 return NULL;
 523         }
 524
 525         /**
 526          * Format a table name ready for use in constructing an SQL query
 527          *
 528          * This does two important things: it brackets table names which as necessary,
 529          * and it adds a table prefix if there is one.
 530          *
 531          * All functions of this object which require a table name call this function
 532          * themselves. Pass the canonical name to such functions. This is only needed
 533          * when calling query() directly.
 534          *
 535          * @param string $name database table name
 536          */
 537         function tableName( $name ) {
 538                 global $wgSharedDB;
 539                 # Skip quoted literals
 540                 if ( $name != '' && $name { 0 } != '[' ) {
 541                         if ( $this->mTablePrefix !== '' &&  strpos( '.', $name ) === false ) {
 542                                 $name = "{$this->mTablePrefix}$name";
 543                         }
 544                         if ( isset( $wgSharedDB ) && "{$this->mTablePrefix}user" == $name ) {
 545                                 $name = "[$wgSharedDB].[$name]";
 546                         } else {
 547                                 # Standard quoting
 548                                 if ( $name != '' ) $name = "[$name]";
 549                         }
 550                 }
 551                 return $name;
 552         }
 553
 554         /**
 555          * Return the next in a sequence, save the value for retrieval via insertId()
 556          */
 557         function nextSequenceValue( $seqName ) {
 558                 if ( !$this->tableExists( 'sequence_' . $seqName ) ) {
 559                         $ret = sqlsrv_query( $this->mConn, "CREATE TABLE [sequence_$seqName] (id INT NOT NULL IDENTITY PRIMARY KEY, junk varchar(10) NULL)" );
 560                 }
 561                 $ret = sqlsrv_query( $this->mConn, "INSERT INTO [sequence_$seqName] (junk) VALUES ('')" );
 562                 $ret = sqlsrv_query( $this->mConn, "SELECT TOP 1 id FROM [sequence_$seqName] ORDER BY id DESC" );
 563                 $row = sqlsrv_fetch_array( $ret, SQLSRV_FETCH_ASSOC );// KEEP ASSOC THERE, weird weird bug dealing with the return value if you don't
 564
 565                 sqlsrv_free_stmt( $ret );
 566                 $this->mInsertId = $row['id'];
 567                 return $row['id'];
 568         }
 569
 570         /**
 571          * Return the current value of a sequence. Assumes it has ben nextval'ed in this session.
 572          */
 573         function currentSequenceValue( $seqName ) {
 574                 $ret = sqlsrv_query( $this->mConn, "SELECT TOP 1 id FROM [sequence_$seqName] ORDER BY id DESC" );
 575                 if ( $ret !== false ) {
 576                         $row = sqlsrv_fetch_array( $ret );
 577                         sqlsrv_free_stmt( $ret );
 578                         return $row['id'];
 579                 } else {
 580                         return $this->nextSequenceValue( $seqName );
 581                 }
 582         }
 583
 584
 585         # REPLACE query wrapper
 586         # MSSQL simulates this with a DELETE followed by INSERT
 587         # $row is the row to insert, an associative array
 588         # $uniqueIndexes is an array of indexes. Each element may be either a
 589         # field name or an array of field names
 590         #
 591         # It may be more efficient to leave off unique indexes which are unlikely to collide.
 592         # However if you do this, you run the risk of encountering errors which wouldn't have
 593         # occurred in MySQL
 594         function replace( $table, $uniqueIndexes, $rows, $fname = 'Database::replace' ) {
 595                 $table = $this->tableName( $table );
 596
 597                 if ( count( $rows ) == 0 ) {
 598                         return;
 599                 }
 600
 601                 # Single row case
 602                 if ( !is_array( reset( $rows ) ) ) {
 603                         $rows = array( $rows );
 604                 }
 605
 606                 foreach ( $rows as $row ) {
 607                         # Delete rows which collide
 608                         if ( $uniqueIndexes ) {
 609                                 $sql = "DELETE FROM $table WHERE ";
 610                                 $first = true;
 611                                 foreach ( $uniqueIndexes as $index ) {
 612                                         if ( $first ) {
 613                                                 $first = false;
 614                                                 $sql .= "(";
 615                                         } else {
 616                                                 $sql .= ') OR (';
 617                                         }
 618                                         if ( is_array( $index ) ) {
 619                                                 $first2 = true;
 620                                                 foreach ( $index as $col ) {
 621                                                         if ( $first2 ) {
 622                                                                 $first2 = false;
 623                                                         } else {
 624                                                                 $sql .= ' AND ';
 625                                                         }
 626                                                         $sql .= $col . '=' . $this->addQuotes( $row[$col] );
 627                                                 }
 628                                         } else {
 629                                                 $sql .= $index . '=' . $this->addQuotes( $row[$index] );
 630                                         }
 631                                 }
 632                                 $sql .= ')';
 633                                 $this->query( $sql, $fname );
 634                         }
 635
 636                         # Now insert the row
 637                         $sql = "INSERT INTO $table (" . $this->makeList( array_keys( $row ), LIST_NAMES ) . ') VALUES (' .
 638                                 $this->makeList( $row, LIST_COMMA ) . ')';
 639                         $this->query( $sql, $fname );
 640                 }
 641         }
 642
 643         # DELETE where the condition is a join
 644         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = "Database::deleteJoin" ) {
 645                 if ( !$conds ) {
 646                         throw new DBUnexpectedError( $this,  'Database::deleteJoin() called with empty $conds' );
 647                 }
 648
 649                 $delTable = $this->tableName( $delTable );
 650                 $joinTable = $this->tableName( $joinTable );
 651                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 652                 if ( $conds != '*' ) {
 653                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 654                 }
 655                 $sql .= ')';
 656
 657                 $this->query( $sql, $fname );
 658         }
 659
 660         # Returns the size of a text field, or -1 for "unlimited"
 661         function textFieldSize( $table, $field ) {
 662                 $table = $this->tableName( $table );
 663                 $sql = "SELECT CHARACTER_MAXIMUM_LENGTH,DATA_TYPE FROM INFORMATION_SCHEMA.Columns
 664                         WHERE TABLE_NAME = '$table' AND COLUMN_NAME = '$field'";
 665                 $res = $this->query( $sql );
 666                 $row = $this->fetchRow( $res );
 667                 $size = -1;
 668                 if ( strtolower( $row['DATA_TYPE'] ) != 'text' ) $size = $row['CHARACTER_MAXIMUM_LENGTH'];
 669                 $this->freeResult( $res );
 670                 return $size;
 671         }
 672
 673         /**
 674          * Construct a LIMIT query with optional offset
 675          * This is used for query pages
 676          * $sql string SQL query we will append the limit too
 677          * $limit integer the SQL limit
 678          * $offset integer the SQL offset (default false)
 679          */
 680         function limitResult( $sql, $limit, $offset = false ) {
 681                 if ( $offset === false || $offset == 0 ) {
 682                         if ( strpos( $sql, "SELECT" ) === false ) {
 683                                 return "TOP {$limit} " . $sql;
 684                         } else {
 685                                 return preg_replace( '/\bSELECT(\s*DISTINCT)?\b/Dsi', 'SELECT$1 TOP ' . $limit, $sql, 1 );
 686                         }
 687                 } else {
 688                         $sql = '
 689                                 SELECT * FROM (
 690                                   SELECT sub2.*, ROW_NUMBER() OVER(ORDER BY sub2.line2) AS line3 FROM (
 691                                         SELECT 1 AS line2, sub1.* FROM (' . $sql . ') AS sub1
 692                                   ) as sub2
 693                                 ) AS sub3
 694                                 WHERE line3 BETWEEN ' . ( $offset + 1 ) . ' AND ' . ( $offset + $limit );
 695                         return $sql;
 696                 }
 697         }
 698
 699         // If there is a limit clause, parse it, strip it, and pass the remaining sql through limitResult()
 700         // with the appropriate parameters. Not the prettiest solution, but better than building a whole new parser.
 701         // This exists becase there are still too many extensions that don't use dynamic sql generation.
 702         function LimitToTopN( $sql ) {
 703                 // Matches: LIMIT {[offset,] row_count | row_count OFFSET offset}
 704                 $pattern = '/\bLIMIT\s+((([0-9]+)\s*,\s*)?([0-9]+)(\s+OFFSET\s+([0-9]+))?)/i';
 705                 if ( preg_match( $pattern, $sql, $matches ) ) {
 706                         // row_count = $matches[4]
 707                         $row_count = $matches[4];
 708                         // offset = $matches[3] OR $matches[6]
 709                         $offset = $matches[3] or
 710                                 $offset = $matches[6] or
 711                                 $offset = false;
 712
 713                         // strip the matching LIMIT clause out
 714                         $sql = str_replace( $matches[0], '', $sql );
 715                         return $this->limitResult( $sql, $row_count, $offset );
 716                 }
 717                 return $sql;
 718         }
 719
 720         // MSSQL does support this, but documentation is too thin to make a generalized
 721         // function for this. Apparently UPDATE TOP (N) works, but the sort order
 722         // may not be what we're expecting so the top n results may be a random selection.
 723         // TODO: Implement properly.
 724         function limitResultForUpdate( $sql, $num ) {
 725                 return $sql;
 726         }
 727
 728
 729         function timestamp( $ts = 0 ) {
 730                 return wfTimestamp( TS_ISO_8601, $ts );
 731         }
 732
 733         /**
 734          * @return string wikitext of a link to the server software's web site
 735          */
 736         function getSoftwareLink() {
 737                 return "[http://www.microsoft.com/sql/ MS SQL Server]";
 738         }
 739
 740         /**
 741          * @return string Version information from the database
 742          */
 743         function getServerVersion() {
 744                 $server_info = sqlsrv_server_info( $this->mConn );
 745                 $version = 'Error';
 746                 if ( isset( $server_info['SQLServerVersion'] ) ) $version = $server_info['SQLServerVersion'];
 747                 return $version;
 748         }
 749
 750         function tableExists ( $table, $schema = false ) {
 751                 $res = sqlsrv_query( $this->mConn, "SELECT * FROM information_schema.tables
 752                         WHERE table_type='BASE TABLE' AND table_name = '$table'" );
 753                 if ( $res === false ) {
 754                         print( "Error in tableExists query: " . $this->getErrors() );
 755                         return false;
 756                 }
 757                 if ( sqlsrv_fetch( $res ) )
 758                         return true;
 759                 else
 760                         return false;
 761         }
 762
 763         /**
 764          * Query whether a given column exists in the mediawiki schema
 765          */
 766         function fieldExists( $table, $field, $fname = 'Database::fieldExists' ) {
 767                 $table = $this->tableName( $table );
 768                 $res = sqlsrv_query( $this->mConn, "SELECT DATA_TYPE FROM INFORMATION_SCHEMA.Columns
 769                         WHERE TABLE_NAME = '$table' AND COLUMN_NAME = '$field'" );
 770                 if ( $res === false ) {
 771                         print( "Error in fieldExists query: " . $this->getErrors() );
 772                         return false;
 773                 }
 774                 if ( sqlsrv_fetch( $res ) )
 775                         return true;
 776                 else
 777                         return false;
 778         }
 779
 780         function fieldInfo( $table, $field ) {
 781                 $table = $this->tableName( $table );
 782                 $res = sqlsrv_query( $this->mConn, "SELECT * FROM INFORMATION_SCHEMA.Columns
 783                         WHERE TABLE_NAME = '$table' AND COLUMN_NAME = '$field'" );
 784                 if ( $res === false ) {
 785                         print( "Error in fieldInfo query: " . $this->getErrors() );
 786                         return false;
 787                 }
 788                 if ( $meta = $this->fetchRow( $res ) )
 789                         return new MssqlField( $meta );
 790                 return false;
 791         }
 792
 793         /**
 794          * Begin a transaction, committing any previously open transaction
 795          */
 796         function begin( $fname = 'Database::begin' ) {
 797                 sqlsrv_begin_transaction( $this->mConn );
 798                 $this->mTrxLevel = 1;
 799         }
 800
 801         /**
 802          * End a transaction
 803          */
 804         function commit( $fname = 'Database::commit' ) {
 805                 sqlsrv_commit( $this->mConn );
 806                 $this->mTrxLevel = 0;
 807         }
 808
 809         /**
 810          * Rollback a transaction.
 811          * No-op on non-transactional databases.
 812          */
 813         function rollback( $fname = 'Database::rollback' ) {
 814                 sqlsrv_rollback( $this->mConn );
 815                 $this->mTrxLevel = 0;
 816         }
 817
 818         function setup_database() {
 819                 global $wgVersion, $wgDBmwschema, $wgDBts2schema, $wgDBport, $wgDBuser;
 820
 821                 // Make sure that we can write to the correct schema
 822                 $ctest = "mediawiki_test_table";
 823                 if ( $this->tableExists( $ctest ) ) {
 824                         $this->doQuery( "DROP TABLE $ctest" );
 825                 }
 826                 $SQL = "CREATE TABLE $ctest (a int)";
 827                 $res = $this->doQuery( $SQL );
 828                 if ( !$res ) {
 829                         print "<b>FAILED</b>. Make sure that the user \"$wgDBuser\" can write to the database</li>\n";
 830                         dieout( "</ul>" );
 831                 }
 832                 $this->doQuery( "DROP TABLE $ctest" );
 833
 834                 $res = dbsource( "../maintenance/mssql/tables.sql", $this );
 835
 836                 # # Update version information
 837                 $mwv = $this->addQuotes( $wgVersion );
 838                 $pgv = $this->addQuotes( $this->getServerVersion() );
 839                 $pgu = $this->addQuotes( $this->mUser );
 840                 $pgp = $this->addQuotes( $wgDBport );
 841                 $dbn = $this->addQuotes( $this->mDBname );
 842
 843                 # # Avoid the non-standard "REPLACE INTO" syntax
 844                 $f = fopen( "../maintenance/interwiki.sql", 'r' );
 845                 if ( $f == false ) {
 846                         dieout( "<li>Could not find the interwiki.sql file" );
 847                 }
 848                 # # We simply assume it is already empty as we have just created it
 849                 $SQL = "INSERT INTO interwiki(iw_prefix,iw_url,iw_local) VALUES ";
 850                 while ( ! feof( $f ) ) {
 851                         $line = fgets( $f, 1024 );
 852                         $matches = array();
 853                         if ( !preg_match( '/^\s*(\(.+?),(\d)\)/', $line, $matches ) ) {
 854                                 continue;
 855                         }
 856                         $this->query( "$SQL $matches[1],$matches[2])" );
 857                 }
 858                 print " (table interwiki successfully populated)...\n";
 859
 860                 $this->commit();
 861         }
 862
 863         /**
 864          * Initial setup as superuser.
 865          * Create the database, schema, login, and user.
 866          */
 867         function initial_setup() {
 868                 global $conf;
 869
 870                 // FIXME: fields need to be properly escaped.
 871
 872                 $this->doQuery("CREATE DATABASE {$conf->DBname};");
 873                 $this->doQuery("USE {$conf->DBname};");
 874                 $this->doQuery("CREATE SCHEMA {$conf->DBname};");
 875                 $this->doQuery("
 876                                                 CREATE
 877                                                         LOGIN {$conf->DBuser}
 878                                                 WITH
 879                                                         PASSWORD='{$conf->DBpassword}'
 880                                                 ;
 881                                         ");
 882                 $this->doQuery("
 883                                                 CREATE
 884                                                         USER {$conf->DBuser}
 885                                                 FOR
 886                                                         LOGIN {$conf->DBuser}
 887                                                 WITH
 888                                                         DEFAULT_SCHEMA={$conf->DBname}
 889                                                 ;
 890                                         ");
 891                 $this->doQuery("
 892                                                 GRANT
 893                                                         BACKUP DATABASE,
 894                                                         BACKUP LOG,
 895                                                         CREATE DEFAULT,
 896                                                         CREATE FUNCTION,
 897                                                         CREATE PROCEDURE,
 898                                                         CREATE RULE,
 899                                                         CREATE TABLE,
 900                                                         CREATE VIEW,
 901                                                         CREATE FULLTEXT CATALOG
 902                                                 ON
 903                                                         DATABASE::{$conf->DBname}
 904                                                 TO {$conf->DBuser}
 905                                                 ;
 906                                         ");
 907                 $this->doQuery("
 908                                                 GRANT
 909                                                         CONTROL
 910                                                 ON
 911                                                         SCHEMA::{$conf->DBname}
 912                                                 TO {$conf->DBuser}
 913                                                 ;
 914                                         ");
 915
 916
 917         }
 918
 919         function encodeBlob( $b ) {
 920         // we can't have zero's and such, this is a simple encoding to make sure we don't barf
 921                 return base64_encode( $b );
 922         }
 923
 924         function decodeBlob( $b ) {
 925         // we can't have zero's and such, this is a simple encoding to make sure we don't barf
 926         return base64_decode( $b );
 927         }
 928
 929         /**
 930          * @private
 931          */
 932         function tableNamesWithUseIndexOrJOIN( $tables, $use_index = array(), $join_conds = array() ) {
 933                 $ret = array();
 934                 $retJOIN = array();
 935                 $use_index_safe = is_array( $use_index ) ? $use_index : array();
 936                 $join_conds_safe = is_array( $join_conds ) ? $join_conds : array();
 937                 foreach ( $tables as $table ) {
 938                         // Is there a JOIN and INDEX clause for this table?
 939                         if ( isset( $join_conds_safe[$table] ) && isset( $use_index_safe[$table] ) ) {
 940                                 $tableClause = $join_conds_safe[$table][0] . ' ' . $this->tableName( $table );
 941                                 $tableClause .= ' ' . $this->useIndexClause( implode( ',', (array)$use_index_safe[$table] ) );
 942                                 $tableClause .= ' ON (' . $this->makeList( (array)$join_conds_safe[$table][1], LIST_AND ) . ')';
 943                                 $retJOIN[] = $tableClause;
 944                         // Is there an INDEX clause?
 945                         } else if ( isset( $use_index_safe[$table] ) ) {
 946                                 $tableClause = $this->tableName( $table );
 947                                 $tableClause .= ' ' . $this->useIndexClause( implode( ',', (array)$use_index_safe[$table] ) );
 948                                 $ret[] = $tableClause;
 949                         // Is there a JOIN clause?
 950                         } else if ( isset( $join_conds_safe[$table] ) ) {
 951                                 $tableClause = $join_conds_safe[$table][0] . ' ' . $this->tableName( $table );
 952                                 $tableClause .= ' ON (' . $this->makeList( (array)$join_conds_safe[$table][1], LIST_AND ) . ')';
 953                                 $retJOIN[] = $tableClause;
 954                         } else {
 955                                 $tableClause = $this->tableName( $table );
 956                                 $ret[] = $tableClause;
 957                         }
 958                 }
 959                 // We can't separate explicit JOIN clauses with ',', use ' ' for those
 960                 $straightJoins = !empty( $ret ) ? implode( ',', $ret ) : "";
 961                 $otherJoins = !empty( $retJOIN ) ? implode( ' ', $retJOIN ) : "";
 962                 // Compile our final table clause
 963                 return implode( ' ', array( $straightJoins, $otherJoins ) );
 964         }
 965
 966         function strencode( $s ) { # # Should not be called by us
 967                 return str_replace( "'", "''", $s );
 968         }
 969
 970         function addQuotes( $s ) {
 971                 if ( $s instanceof Blob ) {
 972                         return "'" . $s->fetch( $s ) . "'";
 973                 } else {
 974                         return parent::addQuotes( $s );
 975                 }
 976         }
 977
 978         function quote_ident( $s ) {
 979                 return "'" . str_replace( "'", "''", $s ) . "'";
 980         }
 981
 982         function selectDB( $db ) {
 983                 return ( $this->query( "SET DATABASE $db" ) !== false );
 984         }
 985
 986         /**
 987          * @private
 988          *
 989          * @param array $options an associative array of options to be turned into
 990          *                        an SQL query, valid keys are listed in the function.
 991          * @return array
 992          */
 993         function makeSelectOptions( $options ) {
 994                 $tailOpts = '';
 995                 $startOpts = '';
 996
 997                 $noKeyOptions = array();
 998                 foreach ( $options as $key => $option ) {
 999                         if ( is_numeric( $key ) ) {
1000                                 $noKeyOptions[$option] = true;
1001                         }
1002                 }
1003
1004                 if ( isset( $options['GROUP BY'] ) ) $tailOpts .= " GROUP BY {$options['GROUP BY']}";
1005                 if ( isset( $options['HAVING'] ) )   $tailOpts .= " HAVING {$options['GROUP BY']}";
1006                 if ( isset( $options['ORDER BY'] ) ) $tailOpts .= " ORDER BY {$options['ORDER BY']}";
1007
1008                 if ( isset( $noKeyOptions['DISTINCT'] ) && isset( $noKeyOptions['DISTINCTROW'] ) ) $startOpts .= 'DISTINCT';
1009
1010                 // we want this to be compatible with the output of parent::makeSelectOptions()
1011                 return array( $startOpts, '' , $tailOpts, '' );
1012         }
1013
1014         public function setTimeout( $timeout ) {
1015                 // couldn't find any timeout functions
1016         }
1017
1018         function ping() {
1019                 wfDebug( "Function ping() not written for MSSQL Native yet" );
1020                 return true;
1021         }
1022
1023         /**
1024          * How lagged is this slave?
1025          *
1026          */
1027         public function getLag() {
1028                 # Not implemented for MSSQL
1029                 return false;
1030         }
1031
1032         /**
1033          * FIXME: Add lag support
1034          */
1035         function setFakeSlaveLag( $lag ) { }
1036         function setFakeMaster( $enabled = false ) { }
1037
1038         /**
1039          * Get the type of the DBMS, as it appears in $wgDBtype.
1040          */
1041         function getType(){
1042                 return 'mssql';
1043         }
1044
1045         function buildConcat( $stringList ) {
1046                 return implode( ' + ', $stringList );
1047         }
1048
1049         public function getSearchEngine() {
1050                 return "SearchMssql";
1051         }
1052
1053 } // end DatabaseMssql class
1054
1055 /**
1056  * Utility class.
1057  * @addtogroup Database
1058  */
1059 class MssqlField {
1060         private $name, $tablename, $default, $max_length, $nullable, $type;
1061         function __construct ( $info ) {
1062                 $this->name = $info['COLUMN_NAME'];
1063                 $this->tablename = $info['TABLE_NAME'];
1064                 $this->default = $info['COLUMN_DEFAULT'];
1065                 $this->max_length = $info['CHARACTER_MAXIMUM_LENGTH'];
1066                 $this->nullable = ( strtolower( $info['IS_NULLABLE'] ) == 'no' ) ? false:true;
1067                 $this->type = $info['DATA_TYPE'];
1068         }
1069         function name() {
1070                 return $this->name;
1071         }
1072
1073         function tableName() {
1074                 return $this->tableName;
1075         }
1076
1077         function defaultValue() {
1078                 return $this->default;
1079         }
1080
1081         function maxLength() {
1082                 return $this->max_length;
1083         }
1084
1085         function nullable() {
1086                 return $this->nullable;
1087         }
1088
1089         function type() {
1090                 return $this->type;
1091         }
1092 }
1093
1094 /**
1095  * The MSSQL PHP driver doesn't support sqlsrv_num_rows, so we recall all rows into an array and maintain our
1096  * own cursor index into that array...This is similar to the way the Oracle driver handles this same issue
1097  *
1098  * @addtogroup Database
1099  */
1100 class MssqlResult {
1101
1102   public function __construct( $queryresult = false ) {
1103         $this->mCursor = 0;
1104         $this->mRows = array();
1105         $this->mNumFields = sqlsrv_num_fields( $queryresult );
1106         $this->mFieldMeta = sqlsrv_field_metadata( $queryresult );
1107         while ( $row = sqlsrv_fetch_array( $queryresult, SQLSRV_FETCH_ASSOC ) ) {
1108                 if ( $row !== null ) {
1109                         foreach ( $row as $k => $v ) {
1110                                 if ( is_object( $v ) && method_exists( $v, 'format' ) ) {// DateTime Object
1111                                         $row[$k] = $v->format( "Y-m-d\TH:i:s\Z" );
1112                                 }
1113                         }
1114                         $this->mRows[] = $row;// read results into memory, cursors are not supported
1115                 }
1116         }
1117         $this->mRowCount = count( $this->mRows );
1118         sqlsrv_free_stmt( $queryresult );
1119   }
1120
1121   private function array_to_obj( $array, &$obj ) {
1122                 foreach ( $array as $key => $value ) {
1123                         if ( is_array( $value ) ) {
1124                                 $obj->$key = new stdClass();
1125                                 array_to_obj( $value, $obj->$key );
1126                         } else {
1127                                 if ( !empty( $key ) ) {
1128                                         $obj->$key = $value;
1129                                 }
1130                         }
1131                 }
1132                 return $obj;
1133   }
1134
1135   public function fetch( $mode = SQLSRV_FETCH_BOTH, $object_class = 'stdClass' ) {
1136         if ( $this->mCursor >= $this->mRowCount || $this->mRowCount == 0 ) return false;
1137         $ret = false;
1138         $arrNum = array();
1139         if ( $mode == SQLSRV_FETCH_NUMERIC || $mode == SQLSRV_FETCH_BOTH ) {
1140                 foreach ( $this->mRows[$this->mCursor] as $key => $value ) {
1141                         $arrNum[] = $value;
1142                 }
1143         }
1144         switch( $mode ) {
1145                 case SQLSRV_FETCH_ASSOC:
1146                         $ret = $this->mRows[$this->mCursor];
1147                         break;
1148                 case SQLSRV_FETCH_NUMERIC:
1149                         $ret = $arrNum;
1150                         break;
1151                 case 'OBJECT':
1152                         $o = new $object_class;
1153                         $ret = $this->array_to_obj( $this->mRows[$this->mCursor], $o );
1154                         break;
1155                 case SQLSRV_FETCH_BOTH:
1156                 default:
1157                         $ret = $this->mRows[$this->mCursor] + $arrNum;
1158                         break;
1159         }
1160
1161         $this->mCursor++;
1162         return $ret;
1163   }
1164
1165   public function get( $pos, $fld ) {
1166         return $this->mRows[$pos][$fld];
1167   }
1168
1169   public function numrows() {
1170         return $this->mRowCount;
1171   }
1172
1173   public function seek( $iRow ) {
1174         $this->mCursor = min( $iRow, $this->mRowCount );
1175   }
1176
1177   public function numfields() {
1178         return $this->mNumFields;
1179   }
1180
1181   public function fieldname( $nr ) {
1182         $arrKeys = array_keys( $this->mRows[0] );
1183         return $arrKeys[$nr];
1184   }
1185
1186   public function fieldtype( $nr ) {
1187         $i = 0;
1188         $intType = -1;
1189         $strType = '';
1190         foreach ( $this->mFieldMeta as $meta ) {
1191                 if ( $nr == $i ) {
1192                         $intType = $meta['Type'];
1193                         break;
1194                 }
1195                 $i++;
1196         }
1197         // http://msdn.microsoft.com/en-us/library/cc296183.aspx contains type table
1198         switch( $intType ) {
1199                 case SQLSRV_SQLTYPE_BIGINT:             $strType = 'bigint'; break;
1200                 case SQLSRV_SQLTYPE_BINARY:             $strType = 'binary'; break;
1201                 case SQLSRV_SQLTYPE_BIT:                        $strType = 'bit'; break;
1202                 case SQLSRV_SQLTYPE_CHAR:                       $strType = 'char'; break;
1203                 case SQLSRV_SQLTYPE_DATETIME:           $strType = 'datetime'; break;
1204                 case SQLSRV_SQLTYPE_DECIMAL/*($precision, $scale)*/: $strType = 'decimal'; break;
1205                 case SQLSRV_SQLTYPE_FLOAT:                      $strType = 'float'; break;
1206                 case SQLSRV_SQLTYPE_IMAGE:                      $strType = 'image'; break;
1207                 case SQLSRV_SQLTYPE_INT:                        $strType = 'int'; break;
1208                 case SQLSRV_SQLTYPE_MONEY:                      $strType = 'money'; break;
1209                 case SQLSRV_SQLTYPE_NCHAR/*($charCount)*/: $strType = 'nchar'; break;
1210                 case SQLSRV_SQLTYPE_NUMERIC/*($precision, $scale)*/: $strType = 'numeric'; break;
1211                 case SQLSRV_SQLTYPE_NVARCHAR/*($charCount)*/: $strType = 'nvarchar'; break;
1212                 // case SQLSRV_SQLTYPE_NVARCHAR('max'): $strType = 'nvarchar(MAX)'; break;
1213                 case SQLSRV_SQLTYPE_NTEXT:                      $strType = 'ntext'; break;
1214                 case SQLSRV_SQLTYPE_REAL:                       $strType = 'real'; break;
1215                 case SQLSRV_SQLTYPE_SMALLDATETIME:      $strType = 'smalldatetime'; break;
1216                 case SQLSRV_SQLTYPE_SMALLINT:           $strType = 'smallint'; break;
1217                 case SQLSRV_SQLTYPE_SMALLMONEY:         $strType = 'smallmoney'; break;
1218                 case SQLSRV_SQLTYPE_TEXT:                       $strType = 'text'; break;
1219                 case SQLSRV_SQLTYPE_TIMESTAMP:          $strType = 'timestamp'; break;
1220                 case SQLSRV_SQLTYPE_TINYINT:            $strType = 'tinyint'; break;
1221                 case SQLSRV_SQLTYPE_UNIQUEIDENTIFIER: $strType = 'uniqueidentifier'; break;
1222                 case SQLSRV_SQLTYPE_UDT:                        $strType = 'UDT'; break;
1223                 case SQLSRV_SQLTYPE_VARBINARY/*($byteCount)*/: $strType = 'varbinary'; break;
1224                 // case SQLSRV_SQLTYPE_VARBINARY('max'): $strType = 'varbinary(MAX)'; break;
1225                 case SQLSRV_SQLTYPE_VARCHAR/*($charCount)*/: $strType = 'varchar'; break;
1226                 // case SQLSRV_SQLTYPE_VARCHAR('max'): $strType = 'varchar(MAX)'; break;
1227                 case SQLSRV_SQLTYPE_XML:                        $strType = 'xml'; break;
1228                 default: $strType = $intType;
1229         }
1230         return $strType;
1231   }
1232
1233   public function free() {
1234         unset( $this->mRows );
1235         return;
1236   }
1237
1238 }