ข้อมูลไม่ลงฐานข้อมูล ช่วยดูโค๊ดหั้ยทีครับ database id_member ไพมารี auto_increment username password nickname id_department

        <?php
        session_start();
        include ("mysql_connect.php");
            $user = $_POST["username"];
            $pass = $_POST["password"];
            $nick = $_POST["nickname"];
            $depart = $_POST["department"];
        if(empty($user)){
        echo "<script>alert('Please input your username');window.location = 'register.php';</script>";
        exit();
        }
        if(empty($pass)){
        echo "<script>alert('Please input your password');window.location = 'register.php';</script>";
        exit();
        }
        if(empty($nick)){
        echo "<script>alert('Please input your nickname');window.location = 'register.php';</script>";
        exit();
        }
        if(empty($depart)){
        echo "<script>alert('Please input your choose department');window.location = 'register.php';</script>";
        exit();
        }
        
        $user_check = mysql_query("SELECT username FROM member WHERE username ='$user'");
        $do_user_check = mysql_num_rows($user_check);

        if($do_user_check >0){
            die("Username is already in use!");
        }

        $sql = "INSERT INTO member SET username='$user' , password='$pass' , nickname='$nick' id_department='$depart'";
        $dbQuery = mysql_query($sql);
        if($dbQuery){
            echo "Save Done";
        }else{
            echo "Error Save".$sql;
        }
        ?>

<?php
        @mysql_connect("localhost", "root", "") or die ("error connect to database");
        @mysql_select_db("report") or die ("error select db");
        mysql_query("SET NAMES 'tis620' ");
?>