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From "Greg Monroe" <Greg.Mon...@DukeCE.com>
Subject RE: saving the state of a object collection
Date Fri, 28 Mar 2008 16:54:31 GMT
Only things that come to mind quickly are:

Use a custom Criteria to build a NOT IN clause that with
an expression to combine your keys.  E.g. build the 
following sort of Custom criteria:

NOT IN ( '1-1', '2-1',...)

Alternatively, you could just add a unique non-key record id 
to book table.  It doesn't have to be the key, just an 
auto increment field.  Then you could just use a normal
NOT IN criteria.

> -----Original Message-----
> From: Thomas Fischer [mailto:fischer@seitenbau.net]
> Sent: Friday, March 28, 2008 11:23 AM
> To: torque-user@db.apache.org
> Subject: saving the state of a object collection
> Has anybody found a simple way to  save the state of object
> ?
> To illustrate what I mean, here's an example (I'm using
> complexObjectModel
> = true and objectIsCaching = true):
> I have two tables, Book and Author. A foreign key exists from book to
> Author, so an author can have several books associated.
> Now I load one author including the associated books. I modify the
> associated set (i.e modify, add and delete books) and want to save it
> as it
> is (i.e. after saving, the list of associated books in the database
> should
> be exactly equal to the list of books in the author object).
> The algorithm I can come up with is the following:
> 1) select the ids of all books in the author object which are not new
> in a
> collection
> 2) delete all books for the author which have an id not in the above
> collection of ids
> 3) save the author (this will save the underlying books as well)
> 2) is painful if the book table has a composite primary key (as I
> cannot
> see how Criteria.NOT_IN should work in this case (or does It ? please
> tell
> me!))
> Does anybody see an easier way to do this ? Hitting the database
> modifying the book list is not an option in my case because the
> possibility
> to NOT save the changes should exist after making the changes in the
>    Thomas
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