Re: Delete cascade?
Re: Delete cascade?
- Subject: Re: Delete cascade?
- From: Ian Joyner <email@hidden>
- Date: Mon, 19 Mar 2007 16:11:39 +1100
Hi Peter,
What you say makes sense. Maybe, because my dependent entity does not
have any further cascades, I'm not seeing anything else being brought
into memory (maybe it's already there).
I think what I would expect is to see is:
SELECT * FROM <owned_table> WHERE OWNER_KEY = <PRIMARY_KEY of owner>
<processing of any cascades from those records>
DELETE FROM <owned_table> WHERE OWNER_KEY = <PRIMARY_KEY of owner>
However, all I see is the DELETEs a single one at a time. Maybe I
just have an simple case?
Thanks
Ian
On 19/03/2007, at 2:08 PM, Peter Vandoros wrote:
Hi Ian,
WebObjects does this because it needs to bring all the EO's into
memory to process the delete rules specified in your EOModel.
Regards
Peter
Ian Joyner wrote:
I just noticed in my system that if I have the cascade delete rule
set on a to-many relationship in EOModeler that the deletes happen
one by one.
That is if I have a master record with three detail records, WO
issues three SQL DELETEs.
The setup is, each record has a primary key PRIMARY_KEY, which
relates to the owned records which have OWNER_KEY. To do the
delete cascade, I would think that DELETE FROM <owned table> WHERE
OWNER_KEY = <PRIMARY_KEY of owner> would suffice.
Have I got something set up wrong here, or am I missing something?
Thanks
Ian Joyner
Sportstec
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