Joined: 03 Aug 2007 Posts: 412 Location: A'dam/Diemen, The Netherlands
Posted: Thu Jan 01, 2009 8:26 pm Post subject: [snipplet] mysql5 triggers
Triggers are great stuff when using mysql5
You can auto update foreign tables having a relationship like this:
table: products
id, cat_id, name, price
tabel: cats
id, name, parent_id
When using triggers you can auto update the FK cat_id on the products table.
I let that to be up to you for now while I give you two simple queries to make sure a date field ( datum, DATE, NULL ) is allways up to date with the latest INSERT or UPDATE:
( I think these lines of code speak for themselves ... )
Code:
CREATE TRIGGER `coupon_code_update` BEFORE UPDATE ON `coupon_code`
FOR EACH ROW SET NEW.datum = now();
CREATE TRIGGER `coupon_code_insert` BEFORE INSERT ON `coupon_code`
FOR EACH ROW SET NEW.datum = now();
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