php连接数据库问题

$dbhandle = mssql_connect($myServer, $myUser, $myPass)  or die("连接不上数据库"); //select a database to work with$selected = mssql_select_db($myDB, $dbhandle)  or die("连接不上指定数据库"); $username=trim($_POST['username']);$password=trim($_POST['pass']);//declare the SQL statement that will query the database$query = "select top 6 * from WEB_VIEW  where DNBH='$username' order by SFMonth desc ";//execute the SQL query and return records$result = mssql_query($query) or die ("查询数据失败: ".mysql_error());        //连接数据库，用于输出查询结果$resultPass = mssql_query($query) or die ("查询数据失败: ".mysql_error());    //连接数据库，用于判断密码$numRows = mssql_num_rows($result); $numRowsPass = mssql_num_rows($resultPass); //$row=mssql_fetch_array($result);$rowPass=mssql_fetch_array($resultPass);session_start();$ask=$_POST['ask'];$dbpass=trim($rowPass[3]);$dbusername=trim($rowPass[0]);if ($username <> $dbusername || $password <> substr($dbpass,-4)) 	{echo "<h2>输入有误，请正确输入用户名和密码。谢谢！</h2>";} elseif ($ask<>$_SESSION['VCODE']) 	   {		echo "<h2>";		echo "验证码回答不正确！";		echo '<a href="javascript:window.history.back()">返回</a>';		echo "</h2>";		}else {		echo $row[4];		//$row[0]、$row[1]、$row[2]............	 }mssql_free_result($result);mssql_free_result($resultPass);mssql_close($dbhandle);