Manager without participation: when DB triggers are cooked?

Hello world

Here's a question that we faced for some time with a colleague of mine and after looking for some info on the forums and doing some tests,
We are still not sure about our conclusion.

Here's the deal: supposed we have a PERSON table with, among other things, a column that stores the last date of update. We define an INSERT trigger and update on this table. On each insert / update of operation, the trigger maintains the last date of update to date.

Through the EntityManager of Toplink, we recovered a PERSON POJO that is mapped to a record in the database. Suppose that we make changes to this PERSON object, when the trigger fires?

-Commit?
-On the flush?
-Both (a little would be illogical, I guess)?


Thanks in advance for your help.

Hello

When a trigger is executed is more a question of a matter of TopLink/JPA DBA and depends on how you set up the trigger. While it is perhaps possible to implement your trigger must be performed when the postings of transactions (I'm not sure), an insert trigger is fired when the database receives an insert statement. The Insert statement will be sent to the database only one time, or a straight flush is triggered and if we're not, when validation is called. The validation of the EntityManager essentially flushes out all the instructions in the database before committing the transaction JDBC.

Hope this helps,
Chris

Tags: Fusion Middleware

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