Re: eo abstract classes and sequences
Re: eo abstract classes and sequences
- Subject: Re: eo abstract classes and sequences
- From: Jürgen Tabert <email@hidden>
- Date: Fri, 22 Mar 2013 18:24:49 +0100
Hi Chuck,
thanks for the quick explanation. But this leads to the question why the Entity Modeler generates the useless sequences for the subclasses
and omits the sequence for the abstract class. If no table name is defined on the abstract class the runtime uses the class name to create the
needed sequence.
In my case the Entity Modeler can't generate a table for the abstract class because I didn't define a table name. There will never be an entity
of this class.
Jürgen
On 22.03.2013, at 17:36, Chuck Hill <email@hidden> wrote:
> Hi Jürgen,
>
> You are not doing anything wrong, that is how it is supposed to work. The GlobalID for all objects in the hierarchy is generated from the top most (abstract in your case) Entity name and the primary key. That implies that the primary key need to be unique across all of the tables in the hierarchy, not just in each table. To ensure this, EOF only generated PKs from the sequence in the top most entity/table.
>
> I am not sure why it is not generating a table for that entity, I don't use Postgres much. Did you define the table name and the column names etc in the model?
>
>
> Chuck
>
>
>
> On 2013-03-22, at 9:30 AM, Jürgen Tabert wrote:
>
>> Hi all,
>>
>> in my eomodel I have one abstract class (without a table) and three subclasses. The Entity Modeler generates the sql code for
>> the three tables, sequences … and nothing for the abstract class. At runtime the system tries to create/use the sequence for the
>> abstract class. I don't understand why.
>> Two questions:
>> What am I doing wrong?
>> Is it possible to prevent this behaviour?
>> by the way PostgreSQL database
>>
>> Thanks
>> Jürgen
>>
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