Customizing data insert from

Question

I have a data insert from that is solely used to insert data in a database. I am trying to figure out a way to customize it such that a few file get auto filled. I use the form to insert data in a table called maintable. 8 of the 10 field of this maintable filled from different vendor's table(currently i manaully put it). What I like to do is see if I can integrate the vendor's table in the page and write codes to autofill the form that put the data in the maintable. I know maybe a while statement will do it. So if in the form  I input vendor's name and product id. it will get the data from vendor's table and relavent product to fill rest of the field. Any guidance will be greatly appreciated as I am very new to web development and don't have much experince in PHP codes.
Thanks

Answer 1

Maybe u can try like this. Assuming you have two inputs in form which I have assigned as below
$product_id = $_POST['pid'];
$vendor = $_POST['vendor_name'];
Then do check for vendor name input.
if(isset($_POST['vendor_name') && !empty($_POST['vendor_name'])) {
$query = " SELECT * FROM vendor WHERE vendor_name = '$vendor' ";
$query2 = mysql_query($query, $databaseName) or die(mysql_error);
$vendor = mysql_fetch_assoc($query2);
} else echo 'Vendor name doesn't exists';
$var = $vendor['var'];
assign for the rest values u want to store in maintable
//do insert record
$insert = INSERT INTO maintable .... VALUES ('$vendor', '$var',.....)