我们如何将mysql触发器与Ruby on Rails 3连接起来？

Question

I'm working on a ROR 3 app which uses mysql as the database. Now I want a trigger every time col1 of table1 is updated. But I also want the values of both col1 and col2 of that row in my rails controllers after the trigger is completed ( so as to update an dynamic progress bar ) ... What approach can I follow for this??

Answer 1

Please check this manual entry to define a trigger on your table.

A trigger will block the trigggering operation until the trigger completes. There is nothing else to do, just wait until your main query ends.

A trigger has no return value. When your update completes (which means your trigger completed too), issue a separate SELECT statement.