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From Michael Gentry <mgen...@masslight.net>
Subject Re: Table with no sequence
Date Fri, 20 Mar 2009 15:31:29 GMT
Well, almost all of us have had legacy schemas that did such things
and we have to deal with them.  Good luck!

mrg


On Fri, Mar 20, 2009 at 10:53 AM,  <hans@welinux.cl> wrote:
> Hi,
>
> Thank you for all the feedback, i can see that there is plenty of solutions that were
not obvious at first. Yes I'm using 3.0.
>
> At first i thought i was committing a sin making this question, i smelled something religious
against meaningful primary keys in legacy systems.
>
> Regards
> Hans
>
> ----- "Michael Gentry" <mgentry@masslight.net> escribió:
>
>> If you assign your primary key(s) manually, before telling Cayenne to
>> commitChanges(), then you'll be fine.  Cayenne will honor the PK
>> value
>> that you set without trying to replace it.
>>
>> You didn't mention which version of Cayenne, but for version 2.0 (and
>> I suppose even in 3.0) you can override your data object's
>> setPersistenceState() method:
>>
>>   public void setPersistenceState(int state)
>>   {
>>     super.setPersistenceState(state);
>>
>>     if (state == PersistenceState.NEW)
>>     {
>>        // Initialize PK here.
>>     }
>>   }
>>
>>
>> For Cayenne 3.0, you can use the new lifecycle callbacks:
>>
>> http://cayenne.apache.org/doc/lifecycle-callbacks.html
>>
>>
>> mrg
>>
>>
>> On Thu, Mar 19, 2009 at 7:07 PM,  <hans@welinux.cl> wrote:
>> > Hi,
>> >
>> > We have a legacy table that have a meaningful primary key, many code
>> depends on it and it's not possible to alter it.
>> > We are building new java applications that need to insert in it.
>> >
>> > We would like to cayenne it and not use any sequence at all for
>> making inserts...
>> >
>> > ¿ it's possible to do it ?
>> >
>> > Regards
>> > Hans
>> >
>
> --
> Hans Poo, WeLinux S.A.
> Oficina: 697.25.42, Celular: 09-319.93.05
> Bombero Ossa # 1010, Santiago
>
>

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