[Query Empty when trying to Insert into database (odbc connection)]

Hi, I hope you guys can help me out. I only know basic PHP and also SQL.  I haven't tried using connecting database yet.

 

My problem is that I'm trying to INSERT a data into an existing table using access but when it reaches $rs = odbc_exec(); it returns an error that the query was empty.

 

Here is the code:

$conn=odbc_connect('trial','','');
if (!$conn)
  {exit("Connection Failed: " . $conn);}
$sql = "INSERT INTO Data (FirstName, LastName, BusinessName) 
VALUES ('$fname', '$lname', '$bname')";

$rs=odbc_exec($sql, $conn);

$rs = @odbc_exec($conn,$sqlstring);

if (!$rs)
{
echo "An error has occured. Please try again", odbc_errormsg($conn);
}
else
{
echo "The record was successfully inserted.";
}

odbc_close($conn);

 

 

and here is the error:

An error has occured. Please try again[MySQL][ODBC 5.1 Driver][mysqld-5.5.20]Query was empty

 

 

I really hope you could help me out.

 

Thanks.