In that case, I'll wait until this issue is resolved by Engineering
before addressing it in the docs. Please continue to keep me in the loop.
June
Marina Vatkina wrote On 08/17/06 12:18,:
> Yes.
>
> thanks,
> -marina
>
> Rebecca Parks wrote:
>
>> Is this relevant to Issue 919?
>>
>> https://glassfish.dev.java.net/issues/show_bug.cgi?id=919
>>
>> June
>>
>> Pramod Gopinath wrote On 08/17/06 11:18,:
>>
>>> Hi Tom
>>> A long time ago we had discussed this as part of introducing
>>> java2db support into the toplink code. At that point of time I had
>>> concentrated on introducing code into the glassfish framework to
>>> support this. Based on the current code base, I think we need to
>>> explore this option again. Below is a very rough proposal that I
>>> wanted to run by you. It would be great to hear your comments on
>>> this topic.
>>>
>>> _/Problem Description:/_
>>> As you are aware toplink drops the tables from the database based
>>> on the new entities that are part of the current application (pu in
>>> the case of EJB3.0). This is wrong because the entities could have
>>> changed and we should always try to drop the old objects
>>> (tables/FKs...)
>>>
>>> _/Proposed solution:/_
>>> The code in
>>> glassfish/entity-persistence/src/java/oracle/toplink/essentials/ejb/cmp3/EntityManagerFactoryProvider.java.generateDdlFiles()
>>>
>>> is aware of the drop files location and where we need to drop the
>>> entities. Based on the options then it calls
>>> createOrReplaceDefaultTables(). In there we could try to read the
>>> drop file and try to drop the entities. If this fails because the
>>> dropFile does not exist, then the code could continue to do what it
>>> does now (mgr.replaceDefaultTables(true)).
>>>
>>> _/Issues to be addressed:/_
>>> If we go down this path, need to do the following
>>> 1. read the drop file
>>> 2. get a hold of the connection (that is currently used to create
>>> the tables directly in the database if the user has selected the
>>> option) and use that option to execute the statements read as part
>>> of 1.
>>>
>>> Thanks
>>> Pramod
>>