<?php
/*
@version   v5.21.0-dev  ??-???-2016
@copyright (c) 2000-2013 John Lim (jlim#natsoft.com). All rights reserved.
@copyright (c) 2014      Damien Regad, Mark Newnham and the ADOdb community
  Released under both BSD license and Lesser GPL library license.
  Whenever there is any discrepancy between the two licenses,
  the BSD license will take precedence.
Set tabs to 4 for best viewing.

  Latest version is available at http://adodb.sourceforge.net

  Native mssql driver. Requires mssql client. Works on Windows.
    http://www.microsoft.com/sql/technologies/php/default.mspx
  To configure for Unix, see
   	http://phpbuilder.com/columns/alberto20000919.php3

    $stream = sqlsrv_get_field($stmt, $index, SQLSRV_SQLTYPE_STREAM(SQLSRV_ENC_BINARY));
    stream_filter_append($stream, "convert.iconv.ucs-2/utf-8"); // Voila, UTF-8 can be read directly from $stream

*/

// security - hide paths
if (!defined('ADODB_DIR')) die();

if (!function_exists('sqlsrv_configure')) {
	die("mssqlnative extension not installed");
}

if (!function_exists('sqlsrv_set_error_handling')) {
	function sqlsrv_set_error_handling($constant) {
		sqlsrv_configure("WarningsReturnAsErrors", $constant);
	}
}
if (!function_exists('sqlsrv_log_set_severity')) {
	function sqlsrv_log_set_severity($constant) {
		sqlsrv_configure("LogSeverity", $constant);
	}
}
if (!function_exists('sqlsrv_log_set_subsystems')) {
	function sqlsrv_log_set_subsystems($constant) {
		sqlsrv_configure("LogSubsystems", $constant);
	}
}


//----------------------------------------------------------------
// MSSQL returns dates with the format Oct 13 2002 or 13 Oct 2002
// and this causes tons of problems because localized versions of
// MSSQL will return the dates in dmy or  mdy order; and also the
// month strings depends on what language has been configured. The
// following two variables allow you to control the localization
// settings - Ugh.
//
// MORE LOCALIZATION INFO
// ----------------------
// To configure datetime, look for and modify sqlcommn.loc,
//   typically found in c:\mssql\install
// Also read :
//   http://support.microsoft.com/default.aspx?scid=kb;EN-US;q220918
// Alternatively use:
//   CONVERT(char(12),datecol,120)
//
// Also if your month is showing as month-1,
//   e.g. Jan 13, 2002 is showing as 13/0/2002, then see
//     http://phplens.com/lens/lensforum/msgs.php?id=7048&x=1
//   it's a localisation problem.
//----------------------------------------------------------------


// has datetime converstion to YYYY-MM-DD format, and also mssql_fetch_assoc
if (ADODB_PHPVER >= 0x4300) {
// docs say 4.2.0, but testing shows only since 4.3.0 does it work!
	ini_set('mssql.datetimeconvert',0);
} else {
	global $ADODB_mssql_mths;		// array, months must be upper-case
	$ADODB_mssql_date_order = 'mdy';
	$ADODB_mssql_mths = array(
		'JAN'=>1,'FEB'=>2,'MAR'=>3,'APR'=>4,'MAY'=>5,'JUN'=>6,
		'JUL'=>7,'AUG'=>8,'SEP'=>9,'OCT'=>10,'NOV'=>11,'DEC'=>12);
}

class ADODB_mssqlnative extends ADOConnection {
	var $databaseType = "mssqlnative";
	var $dataProvider = "mssqlnative";
	var $replaceQuote = "''"; // string to use to replace quotes
	var $fmtDate = "'Y-m-d'";
	var $fmtTimeStamp = "'Y-m-d\TH:i:s'";
	var $hasInsertID = true;
	var $substr = "substring";
	var $length = 'len';
	var $hasAffectedRows = true;
	var $poorAffectedRows = false;
	var $metaDatabasesSQL = "select name from sys.sysdatabases where name <> 'master'";
	var $metaTablesSQL="select name,case when type='U' then 'T' else 'V' end from sysobjects where (type='U' or type='V') and (name not in ('sysallocations','syscolumns','syscomments','sysdepends','sysfilegroups','sysfiles','sysfiles1','sysforeignkeys','sysfulltextcatalogs','sysindexes','sysindexkeys','sysmembers','sysobjects','syspermissions','sysprotects','sysreferences','systypes','sysusers','sysalternates','sysconstraints','syssegments','REFERENTIAL_CONSTRAINTS','CHECK_CONSTRAINTS','CONSTRAINT_TABLE_USAGE','CONSTRAINT_COLUMN_USAGE','VIEWS','VIEW_TABLE_USAGE','VIEW_COLUMN_USAGE','SCHEMATA','TABLES','TABLE_CONSTRAINTS','TABLE_PRIVILEGES','COLUMNS','COLUMN_DOMAIN_USAGE','COLUMN_PRIVILEGES','DOMAINS','DOMAIN_CONSTRAINTS','KEY_COLUMN_USAGE','dtproperties'))";
	var $metaColumnsSQL =
		"select c.name,
		t.name as type,
		c.length,
		c.xprec as precision,
		c.xscale as scale,
		c.isnullable as nullable,
		c.cdefault as default_value,
		c.xtype,
		t.length as type_length,
		sc.is_identity
		from syscolumns c
		join systypes t on t.xusertype=c.xusertype
		join sysobjects o on o.id=c.id
		join sys.tables st on st.name=o.name
		join sys.columns sc on sc.object_id = st.object_id and sc.name=c.name
		where o.name='%s'";
	var $hasTop = 'top';		// support mssql SELECT TOP 10 * FROM TABLE
	var $hasGenID = true;
	var $sysDate = 'convert(datetime,convert(char,GetDate(),102),102)';
	var $sysTimeStamp = 'GetDate()';
	var $maxParameterLen = 4000;
	var $arrayClass = 'ADORecordSet_array_mssqlnative';
	var $uniqueSort = true;
	var $leftOuter = '*=';
	var $rightOuter = '=*';
	var $ansiOuter = true; // for mssql7 or later
	var $identitySQL = 'select SCOPE_IDENTITY()'; // 'select SCOPE_IDENTITY'; # for mssql 2000
	var $uniqueOrderBy = true;
	var $_bindInputArray = true;
	var $_dropSeqSQL = "drop table %s";

	var $connectionInfo    = array('ReturnDatesAsStrings'=>true);
	var $cachedSchemaFlush = false;

	var $sequences = false;
	var $mssql_version = '';

	function __construct()
	{
		if ($this->debug) {
			ADOConnection::outp("<pre>");
			sqlsrv_set_error_handling( SQLSRV_ERRORS_LOG_ALL );
			sqlsrv_log_set_severity( SQLSRV_LOG_SEVERITY_ALL );
			sqlsrv_log_set_subsystems(SQLSRV_LOG_SYSTEM_ALL);
			sqlsrv_configure('WarningsReturnAsErrors', 0);
		} else {
			sqlsrv_set_error_handling(0);
			sqlsrv_log_set_severity(0);
			sqlsrv_log_set_subsystems(SQLSRV_LOG_SYSTEM_ALL);
			sqlsrv_configure('WarningsReturnAsErrors', 0);
		}
	}

	/**
	 * Initializes the SQL Server version.
	 * Dies if connected to a non-supported version (2000 and older)
	 */
	function ServerVersion() {
		$data = $this->ServerInfo();
		preg_match('/^\d{2}/', $data['version'], $matches);
		$version = (int)reset($matches);

		// We only support SQL Server 2005 and up
		if($version < 9) {
			die("SQL SERVER VERSION {$data['version']} NOT SUPPORTED IN mssqlnative DRIVER");
		}

		$this->mssql_version = $version;
	}

	function ServerInfo() {
		global $ADODB_FETCH_MODE;
		static $arr = false;
		if (is_array($arr))
			return $arr;
		if ($this->fetchMode === false) {
			$savem = $ADODB_FETCH_MODE;
			$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		} elseif ($this->fetchMode >=0 && $this->fetchMode <=2) {
			$savem = $this->fetchMode;
		} else
			$savem = $this->SetFetchMode(ADODB_FETCH_NUM);

		$arrServerInfo = sqlsrv_server_info($this->_connectionID);
		$ADODB_FETCH_MODE = $savem;
		$arr['description'] = $arrServerInfo['SQLServerName'].' connected to '.$arrServerInfo['CurrentDatabase'];
		$arr['version'] = $arrServerInfo['SQLServerVersion'];//ADOConnection::_findvers($arr['description']);
		return $arr;
	}

	function IfNull( $field, $ifNull )
	{
		return " ISNULL($field, $ifNull) "; // if MS SQL Server
	}

	function _insertid()
	{
		$rez = sqlsrv_query($this->_connectionID,$this->identitySQL);
		sqlsrv_fetch($rez);
		$this->lastInsertID = sqlsrv_get_field($rez, 0);
		return $this->lastInsertID;
	}

	function _affectedrows()
	{
		if ($this->_queryID)
		return sqlsrv_rows_affected($this->_queryID);
	}

	function GenID($seq='adodbseq',$start=1) {
		switch($this->mssql_version){
		case 9:
		case 10:
			return $this->GenID2008($seq, $start);
			break;
		default:
			return $this->GenID2012($seq, $start);
			break;
		}
	}

	function CreateSequence($seq='adodbseq',$start=1)
	{
		switch($this->mssql_version){
		case 9:
		case 10:
			return $this->CreateSequence2008($seq, $start);
			break;
		default:
			return $this->CreateSequence2012($seq, $start);
			break;
		}
	}

	/**
	 * For Server 2005,2008, duplicate a sequence with an identity table
	 */
	function CreateSequence2008($seq='adodbseq',$start=1)
	{
		if($this->debug) ADOConnection::outp("<hr>CreateSequence($seq,$start)");
		sqlsrv_begin_transaction($this->_connectionID);
		$start -= 1;
		$this->Execute("create table $seq (id int)");//was float(53)
		$ok = $this->Execute("insert into $seq with (tablock,holdlock) values($start)");
		if (!$ok) {
			if($this->debug) ADOConnection::outp("<hr>Error: ROLLBACK");
			sqlsrv_rollback($this->_connectionID);
			return false;
		}
		sqlsrv_commit($this->_connectionID);
		return true;
	}

	/**
	 * Proper Sequences Only available to Server 2012 and up
	 */
	function CreateSequence2012($seq='adodbseq',$start=1){
		if (!$this->sequences){
			$sql = "SELECT name FROM sys.sequences";
			$this->sequences = $this->GetCol($sql);
		}
		$ok = $this->Execute("CREATE SEQUENCE $seq START WITH $start INCREMENT BY 1");
		if (!$ok)
			die("CANNOT CREATE SEQUENCE" . print_r(sqlsrv_errors(),true));
		$this->sequences[] = $seq;
	}

	/**
	 * For Server 2005,2008, duplicate a sequence with an identity table
	 */
	function GenID2008($seq='adodbseq',$start=1)
	{
		if($this->debug) ADOConnection::outp("<hr>CreateSequence($seq,$start)");
		sqlsrv_begin_transaction($this->_connectionID);
		$ok = $this->Execute("update $seq with (tablock,holdlock) set id = id + 1");
		if (!$ok) {
			$start -= 1;
			$this->Execute("create table $seq (id int)");//was float(53)
			$ok = $this->Execute("insert into $seq with (tablock,holdlock) values($start)");
			if (!$ok) {
				if($this->debug) ADOConnection::outp("<hr>Error: ROLLBACK");
				sqlsrv_rollback($this->_connectionID);
				return false;
			}
		}
		$num = $this->GetOne("select id from $seq");
		sqlsrv_commit($this->_connectionID);
		return $num;
	}
	/**
	 * Only available to Server 2012 and up
	 * Cannot do this the normal adodb way by trapping an error if the
	 * sequence does not exist because sql server will auto create a
	 * sequence with the starting number of -9223372036854775808
	 */
	function GenID2012($seq='adodbseq',$start=1)
	{

		/*
		 * First time in create an array of sequence names that we
		 * can use in later requests to see if the sequence exists
		 * the overhead is creating a list of sequences every time
		 * we need access to at least 1. If we really care about
		 * performance, we could maybe flag a 'nocheck' class variable
		 */
		if (!$this->sequences){
			$sql = "SELECT name FROM sys.sequences";
			$this->sequences = $this->GetCol($sql);
		}
		if (!is_array($this->sequences)
		|| is_array($this->sequences) && !in_array($seq,$this->sequences)){
			$this->CreateSequence2012($seq, $start);

		}
		$num = $this->GetOne("SELECT NEXT VALUE FOR $seq");
		return $num;
	}

	// Format date column in sql string given an input format that understands Y M D
	function SQLDate($fmt, $col=false)
	{
		if (!$col) $col = $this->sysTimeStamp;
		$s = '';

		$ConvertableFmt=array(
		       "m/d/Y"=>101,"m/d/y"=>101 // US
		      ,"Y.m.d"=>102,"y/m/d"=>102 // ANSI
		      ,"d/m/Y"=>103,"d/m/y"=>103 // French /english
		      ,"d.m.Y"=>104,"d.m.y"=>104 // German
		      ,"d-m-Y"=>105,"d-m-y"=>105 // Italian
		      ,"m-d-Y"=>110,"m-d-y"=>110 // US Dash
		      ,"Y/m/d"=>111,"y/m/d"=>111 // Japan
		      ,"Ymd"=>112,"ymd"=>112 // ISO
		      ,"H:i:s"=>108 // Time
		);
		if(key_exists($fmt,$ConvertableFmt))
		  return  "convert (varchar ,$col,".$ConvertableFmt[$fmt].")";

		$len = strlen($fmt);
		for ($i=0; $i < $len; $i++) {
			if ($s) $s .= '+';
			$ch = $fmt[$i];
			switch($ch) {
			case 'Y':
			case 'y':
				$s .= "datename(yyyy,$col)";
				break;
			case 'M':
				$s .= "convert(char(3),$col,0)";
				break;
			case 'm':
				$s .= "replace(str(month($col),2),' ','0')";
				break;
			case 'Q':
			case 'q':
				$s .= "datename(quarter,$col)";
				break;
			case 'D':
			case 'd':
				$s .= "replace(str(day($col),2),' ','0')";
				break;
			case 'h':
				$s .= "substring(convert(char(14),$col,0),13,2)";
				break;

			case 'H':
				$s .= "replace(str(datepart(hh,$col),2),' ','0')";
				break;

			case 'i':
				$s .= "replace(str(datepart(mi,$col),2),' ','0')";
				break;
			case 's':
				$s .= "replace(str(datepart(ss,$col),2),' ','0')";
				break;
			case 'a':
			case 'A':
				$s .= "substring(convert(char(19),$col,0),18,2)";
				break;
			case 'l':
				$s .= "datename(dw,$col)";
				break;
			default:
				if ($ch == '\\') {
					$i++;
					$ch = substr($fmt,$i,1);
				}
				$s .= $this->qstr($ch);
				break;
			}
		}
		return $s;
	}


	function BeginTrans()
	{
		if ($this->transOff) return true;
		$this->transCnt += 1;
		if ($this->debug) ADOConnection::outp('<hr>begin transaction');
		sqlsrv_begin_transaction($this->_connectionID);
		return true;
	}

	function CommitTrans($ok=true)
	{
		if ($this->transOff) return true;
		if ($this->debug) ADOConnection::outp('<hr>commit transaction');
		if (!$ok) return $this->RollbackTrans();
		if ($this->transCnt) $this->transCnt -= 1;
		sqlsrv_commit($this->_connectionID);
		return true;
	}

	function RollbackTrans()
	{
		if ($this->transOff) return true;
		if ($this->debug) ADOConnection::outp('<hr>rollback transaction');
		if ($this->transCnt) $this->transCnt -= 1;
		sqlsrv_rollback($this->_connectionID);
		return true;
	}

	function SetTransactionMode( $transaction_mode )
	{
		$this->_transmode  = $transaction_mode;
		if (empty($transaction_mode)) {
			$this->Execute('SET TRANSACTION ISOLATION LEVEL READ COMMITTED');
			return;
		}
		if (!stristr($transaction_mode,'isolation')) $transaction_mode = 'ISOLATION LEVEL '.$transaction_mode;
		$this->Execute("SET TRANSACTION ".$transaction_mode);
	}

	/*
		Usage:

		$this->BeginTrans();
		$this->RowLock('table1,table2','table1.id=33 and table2.id=table1.id'); # lock row 33 for both tables

		# some operation on both tables table1 and table2

		$this->CommitTrans();

		See http://www.swynk.com/friends/achigrik/SQL70Locks.asp
	*/
	function RowLock($tables,$where,$col='1 as adodbignore')
	{
		if ($col == '1 as adodbignore') $col = 'top 1 null as ignore';
		if (!$this->transCnt) $this->BeginTrans();
		return $this->GetOne("select $col from $tables with (ROWLOCK,HOLDLOCK) where $where");
	}

	function SelectDB($dbName)
	{
		$this->database = $dbName;
		$this->databaseName = $dbName; # obsolete, retained for compat with older adodb versions
		if ($this->_connectionID) {
			$rs = $this->Execute('USE '.$dbName);
			if($rs) {
				return true;
			} else return false;
		}
		else return false;
	}

	function ErrorMsg()
	{
		$retErrors = sqlsrv_errors(SQLSRV_ERR_ALL);
		if($retErrors != null) {
			foreach($retErrors as $arrError) {
				$this->_errorMsg .= "SQLState: ".$arrError[ 'SQLSTATE']."\n";
				$this->_errorMsg .= "Error Code: ".$arrError[ 'code']."\n";
				$this->_errorMsg .= "Message: ".$arrError[ 'message']."\n";
			}
		}
		return $this->_errorMsg;
	}

	function ErrorNo()
	{
		$err = sqlsrv_errors(SQLSRV_ERR_ALL);
		if($err[0]) return $err[0]['code'];
		else return 0;
	}

	// returns true or false
	function _connect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		if (!function_exists('sqlsrv_connect')) return null;

		$connectionInfo 			= $this->connectionInfo;
		$connectionInfo["Database"]	= $argDatabasename;
		$connectionInfo["UID"]		= $argUsername;
		$connectionInfo["PWD"]		= $argPassword;

		/*
		* Now merge in the passed connection parameters setting
		*/
		foreach ($this->connectionParameters as $options)
		{
			foreach($options as $parameter=>$value)
				$connectionInfo[$parameter] = $value;
		}

		if ($this->debug) ADOConnection::outp("<hr>connecting... hostname: $argHostname params: ".var_export($connectionInfo,true));
		if(!($this->_connectionID = sqlsrv_connect($argHostname,$connectionInfo)))
		{
			if ($this->debug) ADOConnection::outp( "<hr><b>errors</b>: ".print_r( sqlsrv_errors(), true));
			return false;
		}

		$this->ServerVersion();

		return true;
	}

	// returns true or false
	function _pconnect($argHostname, $argUsername, $argPassword, $argDatabasename)
	{
		//return null;//not implemented. NOTE: Persistent connections have no effect if PHP is used as a CGI program. (FastCGI!)
		return $this->_connect($argHostname, $argUsername, $argPassword, $argDatabasename);
	}

	function Prepare($sql)
	{
		return $sql; // prepare does not work properly with bind parameters as bind parameters are managed by sqlsrv_prepare!
	}

	// returns concatenated string
	// MSSQL requires integers to be cast as strings
	// automatically cast every datatype to VARCHAR(255)
	// @author David Rogers (introspectshun)
	function Concat()
	{
		$s = "";
		$arr = func_get_args();

		// Split single record on commas, if possible
		if (sizeof($arr) == 1) {
			foreach ($arr as $arg) {
				$args = explode(',', $arg);
			}
			$arr = $args;
		}

		array_walk(
			$arr,
			function(&$value, $key) {
				$value = "CAST(" . $value . " AS VARCHAR(255))";
			}
		);
		$s = implode('+',$arr);
		if (sizeof($arr) > 0) return "$s";

		return '';
	}

	/*
		Unfortunately, it appears that mssql cannot handle varbinary > 255 chars
		So all your blobs must be of type "image".

		Remember to set in php.ini the following...

		; Valid range 0 - 2147483647. Default = 4096.
		mssql.textlimit = 0 ; zero to pass through

		; Valid range 0 - 2147483647. Default = 4096.
		mssql.textsize = 0 ; zero to pass through
	*/
	function UpdateBlob($table,$column,$val,$where,$blobtype='BLOB')
	{

		if (strtoupper($blobtype) == 'CLOB') {
			$sql = "UPDATE $table SET $column='" . $val . "' WHERE $where";
			return $this->Execute($sql) != false;
		}
		$sql = "UPDATE $table SET $column=0x".bin2hex($val)." WHERE $where";
		return $this->Execute($sql) != false;
	}

	// returns query ID if successful, otherwise false
	function _query($sql,$inputarr=false)
	{
		$this->_errorMsg = false;

		if (is_array($sql))
			$sql = $sql[1];

		$insert = false;
		// handle native driver flaw for retrieving the last insert ID
		if(preg_match('/^\W*insert[\s\w()",.]+values\s*\((?:[^;\']|\'\'|(?:(?:\'\')*\'[^\']+\'(?:\'\')*))*;?$/i', $sql)) {
			$insert = true;
			$sql .= '; '.$this->identitySQL; // select scope_identity()
		}
		if($inputarr)
		{
			/*
			* Ensure that the input array is numeric, as required by
			* sqlsrv_query. If param() was used to create portable binds
			* then the array might be associative
			*/
			$inputarr = array_values($inputarr);
			$rez = sqlsrv_query($this->_connectionID, $sql, $inputarr);
		} else {
			$rez = sqlsrv_query($this->_connectionID,$sql);
		}

		if ($this->debug) ADOConnection::outp("<hr>running query: ".var_export($sql,true)."<hr>input array: ".var_export($inputarr,true)."<hr>result: ".var_export($rez,true));

		if(!$rez)
			$rez = false;

		return $rez;
	}

	// returns true or false
	function _close()
	{
		if ($this->transCnt) {
			$this->RollbackTrans();
		}
		if($this->_connectionID) {
			$rez = sqlsrv_close($this->_connectionID);
		}
		$this->_connectionID = false;
		return $rez;
	}

	// mssql uses a default date like Dec 30 2000 12:00AM
	static function UnixDate($v)
	{
		return ADORecordSet_array_mssqlnative::UnixDate($v);
	}

	static function UnixTimeStamp($v)
	{
		return ADORecordSet_array_mssqlnative::UnixTimeStamp($v);
	}

	function MetaIndexes($table,$primary=false, $owner = false)
	{
		$table = $this->qstr($table);

		$sql = "SELECT i.name AS ind_name, C.name AS col_name, USER_NAME(O.uid) AS Owner, c.colid, k.Keyno,
			CASE WHEN I.indid BETWEEN 1 AND 254 AND (I.status & 2048 = 2048 OR I.Status = 16402 AND O.XType = 'V') THEN 1 ELSE 0 END AS IsPK,
			CASE WHEN I.status & 2 = 2 THEN 1 ELSE 0 END AS IsUnique
			FROM dbo.sysobjects o INNER JOIN dbo.sysindexes I ON o.id = i.id
			INNER JOIN dbo.sysindexkeys K ON I.id = K.id AND I.Indid = K.Indid
			INNER JOIN dbo.syscolumns c ON K.id = C.id AND K.colid = C.Colid
			WHERE LEFT(i.name, 8) <> '_WA_Sys_' AND o.status >= 0 AND O.Name LIKE $table
			ORDER BY O.name, I.Name, K.keyno";

		global $ADODB_FETCH_MODE;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		if ($this->fetchMode !== FALSE) {
			$savem = $this->SetFetchMode(FALSE);
		}

		$rs = $this->Execute($sql);
		if (isset($savem)) {
			$this->SetFetchMode($savem);
		}
		$ADODB_FETCH_MODE = $save;

		if (!is_object($rs)) {
			return FALSE;
		}

		$indexes = array();
		while ($row = $rs->FetchRow()) {
			if (!$primary && $row[5]) continue;

			$indexes[$row[0]]['unique'] = $row[6];
			$indexes[$row[0]]['columns'][] = $row[1];
		}
		return $indexes;
	}

	function MetaForeignKeys($table, $owner=false, $upper=false)
	{
		global $ADODB_FETCH_MODE;

		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		$table = $this->qstr(strtoupper($table));

		$sql =
			"select object_name(constid) as constraint_name,
				col_name(fkeyid, fkey) as column_name,
				object_name(rkeyid) as referenced_table_name,
				col_name(rkeyid, rkey) as referenced_column_name
			from sysforeignkeys
			where upper(object_name(fkeyid)) = $table
			order by constraint_name, referenced_table_name, keyno";

		$constraints = $this->GetArray($sql);

		$ADODB_FETCH_MODE = $save;

		$arr = false;
		foreach($constraints as $constr) {
			//print_r($constr);
			$arr[$constr[0]][$constr[2]][] = $constr[1].'='.$constr[3];
		}
		if (!$arr) return false;

		$arr2 = false;

		foreach($arr as $k => $v) {
			foreach($v as $a => $b) {
				if ($upper) $a = strtoupper($a);
				$arr2[$a] = $b;
			}
		}
		return $arr2;
	}

	//From: Fernando Moreira <FMoreira@imediata.pt>
	function MetaDatabases()
	{
		$this->SelectDB("master");
		$rs =& $this->Execute($this->metaDatabasesSQL);
		$rows = $rs->GetRows();
		$ret = array();
		for($i=0;$i<count($rows);$i++) {
			$ret[] = $rows[$i][0];
		}
		$this->SelectDB($this->database);
		if($ret)
			return $ret;
		else
			return false;
	}

	// "Stein-Aksel Basma" <basma@accelero.no>
	// tested with MSSQL 2000
	function MetaPrimaryKeys($table, $owner=false)
	{
		global $ADODB_FETCH_MODE;

		$schema = '';
		$this->_findschema($table,$schema);
		if (!$schema) $schema = $this->database;
		if ($schema) $schema = "and k.table_catalog like '$schema%'";

		$sql = "select distinct k.column_name,ordinal_position from information_schema.key_column_usage k,
		information_schema.table_constraints tc
		where tc.constraint_name = k.constraint_name and tc.constraint_type =
		'PRIMARY KEY' and k.table_name = '$table' $schema order by ordinal_position ";

		$savem = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
		$a = $this->GetCol($sql);
		$ADODB_FETCH_MODE = $savem;

		if ($a && sizeof($a)>0) return $a;
		$false = false;
		return $false;
	}


	function MetaTables($ttype=false,$showSchema=false,$mask=false)
	{
		if ($mask) {
			$save = $this->metaTablesSQL;
			$mask = $this->qstr(($mask));
			$this->metaTablesSQL .= " AND name like $mask";
		}
		$ret = ADOConnection::MetaTables($ttype,$showSchema);

		if ($mask) {
			$this->metaTablesSQL = $save;
		}
		return $ret;
	}
	function MetaColumns($table, $upper=true, $schema=false){

		/*
		* A simple caching mechanism, to be replaced in ADOdb V6
		*/
		static $cached_columns = array();
		if ($this->cachedSchemaFlush)
			$cached_columns = array();

		if (array_key_exists($table,$cached_columns)){
			return $cached_columns[$table];
		}


		$this->_findschema($table,$schema);
		if ($schema) {
			$dbName = $this->database;
			$this->SelectDB($schema);
		}
		global $ADODB_FETCH_MODE;
		$save = $ADODB_FETCH_MODE;
		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

		if ($this->fetchMode !== false) $savem = $this->SetFetchMode(false);
		$rs = $this->Execute(sprintf($this->metaColumnsSQL,$table));

		if ($schema) {
			$this->SelectDB($dbName);
		}

		if (isset($savem)) $this->SetFetchMode($savem);
		$ADODB_FETCH_MODE = $save;
		if (!is_object($rs)) {
			$false = false;
			return $false;
		}

		$retarr = array();
		while (!$rs->EOF){

			$fld = new ADOFieldObject();
			if (array_key_exists(0,$rs->fields)) {
				$fld->name          = $rs->fields[0];
				$fld->type          = $rs->fields[1];
				$fld->max_length    = $rs->fields[2];
				$fld->precision     = $rs->fields[3];
				$fld->scale         = $rs->fields[4];
				$fld->not_null      =!$rs->fields[5];
				$fld->has_default   = $rs->fields[6];
				$fld->xtype         = $rs->fields[7];
				$fld->type_length   = $rs->fields[8];
				$fld->auto_increment= $rs->fields[9];
			} else {
				$fld->name          = $rs->fields['name'];
				$fld->type          = $rs->fields['type'];
				$fld->max_length    = $rs->fields['length'];
				$fld->precision     = $rs->fields['precision'];
				$fld->scale         = $rs->fields['scale'];
				$fld->not_null      =!$rs->fields['nullable'];
				$fld->has_default   = $rs->fields['default_value'];
				$fld->xtype         = $rs->fields['xtype'];
				$fld->type_length   = $rs->fields['type_length'];
				$fld->auto_increment= $rs->fields['is_identity'];
			}

			if ($save == ADODB_FETCH_NUM)
				$retarr[] = $fld;
			else
				$retarr[strtoupper($fld->name)] = $fld;

			$rs->MoveNext();

		}
		$rs->Close();
		$cached_columns[$table] = $retarr;

		return $retarr;
	}

	/**
	* Returns a substring of a varchar type field
	*
	* The SQL server version varies because the length is mandatory, so
	* we append a reasonable string length
	*
	* @param	string	$fld	The field to sub-string
	* @param	int		$start	The start point
	* @param	int		$length	An optional length
	*
	* @return	The SQL text
	*/
	function substr($fld,$start,$length=0)
	{
		if ($length == 0)
			/*
		     * The length available to varchar is 2GB, but that makes no
			 * sense in a substring, so I'm going to arbitrarily limit
			 * the length to 1K, but you could change it if you want
			 */
			$length = 1024;

		$text = "SUBSTRING($fld,$start,$length)";
		return $text;
	}

	/**
	* Returns the maximum size of a MetaType C field. Because of the
	* database design, SQL Server places no limits on the size of data inserted
	* Although the actual limit is 2^31-1 bytes.
	*
	* @return int
	*/
	function charMax()
	{
		return ADODB_STRINGMAX_NOLIMIT;
	}

	/**
	* Returns the maximum size of a MetaType X field. Because of the
	* database design, SQL Server places no limits on the size of data inserted
	* Although the actual limit is 2^31-1 bytes.
	*
	* @return int
	*/
	function textMax()
	{
		return ADODB_STRINGMAX_NOLIMIT;
	}
}

/*--------------------------------------------------------------------------------------
	Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordset_mssqlnative extends ADORecordSet {

	var $databaseType = "mssqlnative";
	var $canSeek = false;
	var $fieldOffset = 0;
	// _mths works only in non-localised system

	/*
	 * Holds a cached version of the metadata
	 */
	private $fieldObjects = false;

	/*
	 * Flags if we have retrieved the metadata
	 */
	private $fieldObjectsRetrieved = false;

	/*
	* Cross-reference the objects by name for easy access
	*/
	private $fieldObjectsIndex = array();


	/*
	 * Cross references the dateTime objects for faster decoding
	 */
	private $dateTimeObjects = array();

	/*
	 * flags that we have dateTimeObjects to handle
	 */
	private $hasDateTimeObjects = false;

	/*
	 * This is cross reference between how the types are stored
	 * in SQL Server and their english-language description
	 */
	private $_typeConversion = array(
			-155 => 'datetimeoffset',
			-154 => 'time',
			-152 => 'xml',
			-151 => 'udt',
			-11  => 'uniqueidentifier',
			-10  => 'ntext',
			-9   => 'nvarchar',
			-8   => 'nchar',
			-7   => 'bit',
			-6   => 'tinyint',
			-5   => 'bigint',
			-4   => 'image',
			-3   => 'varbinary',
			-2   => 'timestamp',
			-1   => 'text',
			 1   => 'char',
			 2   => 'numeric',
			 3   => 'decimal',
			 4   => 'int',
			 5   => 'smallint',
			 6   => 'float',
			 7   => 'real',
			 12  => 'varchar',
			 91  => 'date',
			 93  => 'datetime'
			);




	function __construct($id,$mode=false)
	{
		if ($mode === false) {
			global $ADODB_FETCH_MODE;
			$mode = $ADODB_FETCH_MODE;

		}
		$this->fetchMode = $mode;
		parent::__construct($id);
	}


	function _initrs()
	{
		$this->_numOfRows = -1;//not supported
		$fieldmeta = sqlsrv_field_metadata($this->_queryID);
		$this->_numOfFields = ($fieldmeta)? count($fieldmeta):-1;
		/*
		* Cache the metadata right now
		 */
		$this->_fetchField();

	}


	//Contributed by "Sven Axelsson" <sven.axelsson@bokochwebb.se>
	// get next resultset - requires PHP 4.0.5 or later
	function NextRecordSet()
	{
		if (!sqlsrv_next_result($this->_queryID)) return false;
		$this->_inited = false;
		$this->bind = false;
		$this->_currentRow = -1;
		$this->Init();
		return true;
	}

	/* Use associative array to get fields array */
	function Fields($colname)
	{
		if ($this->fetchMode != ADODB_FETCH_NUM) return $this->fields[$colname];
		if (!$this->bind) {
			$this->bind = array();
			for ($i=0; $i < $this->_numOfFields; $i++) {
				$o = $this->FetchField($i);
				$this->bind[strtoupper($o->name)] = $i;
			}
		}

		return $this->fields[$this->bind[strtoupper($colname)]];
	}

	/**
	* Returns: an object containing field information.
	*
	* Get column information in the Recordset object. fetchField()
	* can be used in order to obtain information about fields in a
	* certain query result. If the field offset isn't specified,
	* the next field that wasn't yet retrieved by fetchField()
	* is retrieved.
	*
	* $param int $fieldOffset (optional default=-1 for all
	* @return mixed an ADOFieldObject, or array of objects
	*/
	private function _fetchField($fieldOffset = -1)
	{
		if ($this->fieldObjectsRetrieved){
			if ($this->fieldObjects) {
				/*
				 * Already got the information
				 */
				if ($fieldOffset == -1)
					return $this->fieldObjects;
				else
					return $this->fieldObjects[$fieldOffset];
			}
			else
				/*
			     * No metadata available
				 */
				return false;
		}

		$this->fieldObjectsRetrieved = true;
		/*
		 * Retrieve all metadata in one go. This is always returned as a
		 * numeric array.
		 */
		$fieldMetaData = sqlsrv_field_metadata($this->_queryID);

		if (!$fieldMetaData)
			/*
		     * Not a statement that gives us metaData
			 */
			return false;

		$this->_numOfFields = count($fieldMetaData);
		foreach ($fieldMetaData as $key=>$value)
		{

			$fld = new ADOFieldObject;
			/*
			 * Caution - keys are case-sensitive, must respect
			 * casing of values
			 */

			$fld->name          = $value['Name'];
			$fld->max_length    = $value['Size'];
			$fld->column_source = $value['Name'];
			$fld->type          = $this->_typeConversion[$value['Type']];

			$this->fieldObjects[$key] = $fld;

			$this->fieldObjectsIndex[$fld->name] = $key;

		}
		if ($fieldOffset == -1)
			return $this->fieldObjects;

		return $this->fieldObjects[$fieldOffset];
	}

	/*
	 * Fetchfield copies the oracle method, it loads the field information
	 * into the _fieldobjs array once, to save multiple calls to the
	 * sqlsrv_field_metadata function
	 *
	 * @param int $fieldOffset	(optional)
	 *
	 * @return adoFieldObject
	 *
	 * @author 	KM Newnham
	 * @date 	02/20/2013
	 */
	function fetchField($fieldOffset = -1)
	{
		return $this->fieldObjects[$fieldOffset];
	}

	function _seek($row)
	{
		return false;//There is no support for cursors in the driver at this time.  All data is returned via forward-only streams.
	}

	// speedup
	function MoveNext()
	{
		if ($this->EOF)
			return false;

		$this->_currentRow++;

		if ($this->_fetch())
			return true;
		$this->EOF = true;

		return false;
	}

	function _fetch($ignore_fields=false)
	{
		if ($this->fetchMode & ADODB_FETCH_ASSOC) {
			if ($this->fetchMode & ADODB_FETCH_NUM)
				$this->fields = @sqlsrv_fetch_array($this->_queryID,SQLSRV_FETCH_BOTH);
			else
				$this->fields = @sqlsrv_fetch_array($this->_queryID,SQLSRV_FETCH_ASSOC);

			if (is_array($this->fields))
			{

				if (ADODB_ASSOC_CASE == ADODB_ASSOC_CASE_LOWER)
					$this->fields = array_change_key_case($this->fields,CASE_LOWER);
				else if (ADODB_ASSOC_CASE == ADODB_ASSOC_CASE_UPPER)
					$this->fields = array_change_key_case($this->fields,CASE_UPPER);

			}
		}
		else
			$this->fields = @sqlsrv_fetch_array($this->_queryID,SQLSRV_FETCH_NUMERIC);

		if (!$this->fields)
			return false;

		return $this->fields;
	}

	/**
	 * close() only needs to be called if you are worried about using too much
	 * memory while your script is running. All associated result memory for
	 * the specified result identifier will automatically be freed.
	 */
	function _close()
	{
		if(is_object($this->_queryID)) {
			$rez = sqlsrv_free_stmt($this->_queryID);
			$this->_queryID = false;
			return $rez;
		}
		return true;
	}

	// mssql uses a default date like Dec 30 2000 12:00AM
	static function UnixDate($v)
	{
		return ADORecordSet_array_mssqlnative::UnixDate($v);
	}

	static function UnixTimeStamp($v)
	{
		return ADORecordSet_array_mssqlnative::UnixTimeStamp($v);
	}
}


class ADORecordSet_array_mssqlnative extends ADORecordSet_array {

	// mssql uses a default date like Dec 30 2000 12:00AM
	static function UnixDate($v)
	{

		if (is_numeric(substr($v,0,1)) && ADODB_PHPVER >= 0x4200) return parent::UnixDate($v);

		global $ADODB_mssql_mths,$ADODB_mssql_date_order;

		//Dec 30 2000 12:00AM
		if ($ADODB_mssql_date_order == 'dmy') {
			if (!preg_match( "|^([0-9]{1,2})[-/\. ]+([A-Za-z]{3})[-/\. ]+([0-9]{4})|" ,$v, $rr)) {
				return parent::UnixDate($v);
			}
			if ($rr[3] <= TIMESTAMP_FIRST_YEAR) return 0;

			$theday = $rr[1];
			$themth =  substr(strtoupper($rr[2]),0,3);
		} else {
			if (!preg_match( "|^([A-Za-z]{3})[-/\. ]+([0-9]{1,2})[-/\. ]+([0-9]{4})|" ,$v, $rr)) {
				return parent::UnixDate($v);
			}
			if ($rr[3] <= TIMESTAMP_FIRST_YEAR) return 0;

			$theday = $rr[2];
			$themth = substr(strtoupper($rr[1]),0,3);
		}
		$themth = $ADODB_mssql_mths[$themth];
		if ($themth <= 0) return false;
		// h-m-s-MM-DD-YY
		return  adodb_mktime(0,0,0,$themth,$theday,$rr[3]);
	}

	static function UnixTimeStamp($v)
	{

		if (is_numeric(substr($v,0,1)) && ADODB_PHPVER >= 0x4200) return parent::UnixTimeStamp($v);

		global $ADODB_mssql_mths,$ADODB_mssql_date_order;

		//Dec 30 2000 12:00AM
		if ($ADODB_mssql_date_order == 'dmy') {
			if (!preg_match( "|^([0-9]{1,2})[-/\. ]+([A-Za-z]{3})[-/\. ]+([0-9]{4}) +([0-9]{1,2}):([0-9]{1,2}) *([apAP]{0,1})|"
			,$v, $rr)) return parent::UnixTimeStamp($v);
			if ($rr[3] <= TIMESTAMP_FIRST_YEAR) return 0;

			$theday = $rr[1];
			$themth =  substr(strtoupper($rr[2]),0,3);
		} else {
			if (!preg_match( "|^([A-Za-z]{3})[-/\. ]+([0-9]{1,2})[-/\. ]+([0-9]{4}) +([0-9]{1,2}):([0-9]{1,2}) *([apAP]{0,1})|"
			,$v, $rr)) return parent::UnixTimeStamp($v);
			if ($rr[3] <= TIMESTAMP_FIRST_YEAR) return 0;

			$theday = $rr[2];
			$themth = substr(strtoupper($rr[1]),0,3);
		}

		$themth = $ADODB_mssql_mths[$themth];
		if ($themth <= 0) return false;

		switch (strtoupper($rr[6])) {
		case 'P':
			if ($rr[4]<12) $rr[4] += 12;
			break;
		case 'A':
			if ($rr[4]==12) $rr[4] = 0;
			break;
		default:
			break;
		}
		// h-m-s-MM-DD-YY
		return  adodb_mktime($rr[4],$rr[5],0,$themth,$theday,$rr[3]);
	}
}

/*
Code Example 1:

select	object_name(constid) as constraint_name,
		object_name(fkeyid) as table_name,
		col_name(fkeyid, fkey) as column_name,
	object_name(rkeyid) as referenced_table_name,
	col_name(rkeyid, rkey) as referenced_column_name
from sysforeignkeys
where object_name(fkeyid) = x
order by constraint_name, table_name, referenced_table_name,  keyno

Code Example 2:
select	constraint_name,
	column_name,
	ordinal_position
from information_schema.key_column_usage
where constraint_catalog = db_name()
and table_name = x
order by constraint_name, ordinal_position

http://www.databasejournal.com/scripts/article.php/1440551
*/
