Question

I am wondering if it is possible to perform a SQL query then update another table with the generated ID and continue through all of the rows?

I have this SQL query that works but what I need to do is after each row is added to cards to then update merged.cars_id with the last generated ID so they are linked. normally I would do this with PHP but ideally I would like to just do it with MySQL if possible.

MAIN QUERY

INSERT INTO cards (first_contact_date, card_type, property_id, user_id)
SELECT first_contact_date, 'P', property_id, user_id FROM merged

THEN I NEED WITH MATCHING ROWS (Roughly)

 UPDATE merged SET merged.card_id = LAST_INSERT_ID (FROM ABOVE) into the matching record..

Is something like this possible and how do I do it?

Answer 1

I would recommend using MySQL triggers to do this
http://dev.mysql.com/doc/refman/5.0/en/create-trigger.html

A trigger is a function that will be executed AFTER or BEFORE the INSERT or DELETE or UPDATE is done over any record of your table.

In your case you need to do a AFTER INSERT on cards that just updates the merged table. Make sure its AFTER insert as you wont be able to access the new row’s ID otherwise.

The code would look something like this, assuming the id field from the cards table its named “id”

delimiter |

CREATE TRIGGER updating_merged AFTER INSERT ON cards
  FOR EACH ROW BEGIN
    UPDATE merged SET card_id = NEW.id;
  END;
|
delimiter ;