Php 致命错误：访问SQL Server表时

通过PHP脚本访问SQL Server 2014中的数据时出现以下致命错误

Fatal error: Uncaught PDOException: SQLSTATE[42000]: [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]The SELECT permission was denied on the object 'test_table', database 'test_db', schema 'dbo'.

我的PHP脚本是

$server = 'KESAVATDL\SQLEXPRESS';    //KESAVATDL\SQLEXPRESS
$dbname = "acharya_db";
$usname="";
$passwd="";

try
{
    $con=new PDO("sqlsrv:Server=$server;Database=$dbname",$usname,$passwd);


    $con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    echo "Connected Successfully.";
}
catch(PDOException $e)
{
   echo "Connection failed: " . $e->getMessage();
}

$sql = "SELECT * FROM test";

foreach ($con->query($sql) as $row) {
   print_r($row);
}

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你能显示PHP脚本吗？可能是