On 12/16/2013 07:53 PM, Robert Haas wrote:
> So, put a BEFORE trigger, and make it return NULL. Same effect,
> different notation.
NOT the same:
Master partition table with BEFORE trigger:
josh=# insert into a ( id, val ) values ( 23, 'test' ), ( 24, 'test'),
(25,'test');
INSERT 0 0
^^^
View with INSTEAD OF trigger:
josh=# insert into a_v ( id, val ) values ( 23, 'test' ), ( 24, 'test'),
(25,'test');
INSERT 0 3
^^^
The difference here is that the INSTEAD OF trigger returns a
rows-affected count, and the BEFORE trigger does not (it returns 0).
Some drivers and ORMs, most notably Hibernate, check this rows-returned
count, and error if they don't match the rows sent.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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