Problem to insert id into the foreign key php/mysql

Question

Hello all,
I'm having rouble to understand the process and there is no tutorial about my problem anywhere
I have two table:
Table 1 (member) with id, name, phone etc
Table2 (post) add_id, title, description, price, member_id
I got a form to post the add and I need to insert the id of table 1 into my table 2 member_id zone
Fisrt I did the recorset to get user id
$colname_rsMember = "-1";
if (isset($_SESSION['MM_Username'])) {
  $colname_rsMember = $_SESSION['MM_Username'];
mysql_select_db($database_connect, $connect);
$query_rsMember = sprintf("SELECT * FROM member WHERE username='".$_SESSION['MM_Username']."'")or die(mysql_error());
$rsMember = mysql_query($query_rsMember, $connect) or die(mysql_error());
$row_rsMember = mysql_fetch_assoc($rsMember);
$totalRows_rsMember = mysql_num_rows($rsMember);
This part is working and I'm able to retreive info via echo just for testing
After this code I have my insert code
if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "form2")) {
  $insertSQL = sprintf("INSERT INTO add (title, `description`, price, member_id) VALUES (%s, %s, %s, %s)",
                       GetSQLValueString($_POST['title'], "text"),
                       GetSQLValueString($_POST['description'], "text"),
                       GetSQLValueString($_POST['price'], "text"),
                       GetSQLValueString($_POST['member_id'], "int"));
  mysql_select_db($database_connect, $connect);
  $Result1 = mysql_query($insertSQL, $connect) or die(mysql_error());
  $insertGoTo = "ok.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
    $insertGoTo .= $_SERVER['QUERY_STRING'];
  header(sprintf("Location: %s", $insertGoTo));
Do I need to include hidden field in y form?
I'm having the same error message. Col member_id can't not be null
Any idea what I'm doing wrong?
Thank You!

Answer 1

When someone logs in, Dreamweaver creates a session variable called $_SESSION['MM_Username']. Use that session variable to create a recordset to get the user's ID, which can then be entered into the foreign key field of the child table.
Dreamweaver automatically puts the code for recordsets immediately above the DOCTYPE declaration, so you will need to move it above the code for the Insert Record server behavior. So, it needs to be in this order:
Recordset to get user ID
Insert Record for child table