I am Getting MySQL related Errors

Question

I am getting these errors:-

Warning: mysql_real_escape_string() expects parameter 2 to be resource, object given in /home/androidappaniacm/public_html/ask/qa-external/qa-external-users.php on line 212

Warning: mysql_query() expects parameter 2 to be resource, object given in /home/androidappaniacm/public_html/ask/qa-external/qa-external-users.php on line 214

Warning: mysql_fetch_assoc() expects parameter 1 to be resource, null given in /home/androidappaniacm/public_html/ask/qa-external/qa-external-users.php on line 215

 

I think, I am not able to configure the MySQL part given below:-

            $qa_db_connection=qa_db_connection();

            $result=mysql_fetch_assoc(
                mysql_query(
                    "SELECT email FROM users WHERE id='".mysql_real_escape_string($userid, $qa_db_connection)."'",
                    $qa_db_connection
                )
            );