Question

I Have 2 tables in my db that each have a column named Catergory.

Categories Table -
id | category_name
1  : basic
2  : midlevel
3  : highlevel
4  : profesional

Product Table - 
id | product | category_name
1  : adsl 1G : basic
2  : adls 2G : midlevel
3  : adsl 3G : highlevel
4  : adsl 4G : profesional

When i update the *category_name* in the categories table i would like to change it in the Products table as well, but i am not sure on how to do this.

I couldnt find and answer because i dont know how to phrase it correctly.

Any help would be appreciated.

What my update.php looks like now:

     db_update("UPDATE category SET 
    `category_name` = '".$_POST['category_name']."'
     WHERE category_id = '".$id."'");

what is should look like:???

{code here}

Note: “FIXED – I forgot to send my old value to the save.php file so the $id never knew what to update”.

Answer 1

You could just run two queries changing both names:

<?php
mysql_query("UPDATE categories SET category_name='" . $catname . "' WHERE category_name='basic'");
mysql_query("UPDATE product SET category_name='" . $catname . "' WHERE category_name='basic'");
?>

If you want to do it in one string you can do this with multiple queries, a joined query or a stored procedure.

Multiple queries in one string:

<?php
    mysql_query("
        mySqlQuery(UPDATE categories SET category_name='" . $catname . "' WHERE category_name='basic';)
        mySqlQuery(UPDATE product SET category_name='" . $catname . "' WHERE category_name='basic';)
    ");
?>

Joined query:

<?php
mysql_query("
    UPDATE `product`,`categories`
    SET `product`.`category_name` = '" . $catname . "',
        `categories`.`category_name` = '" . $catname . "'
    WHERE `items`.`id` = '" . $catname . "'
");
?>

If none of the above work I suggest changing your tables so there isn’t a matching name but a matching ID.

You’ll get the following:

Categories Table -
id | category_name
1  : basic
2  : midlevel
3  : highlevel
4  : profesional

Product Table - 
id | category_ID | product
1  : 1           : adsl 1G
2  : 2           : adls 2G
3  : 3           : adsl 3G
4  : 3           : adsl 4G