Hi Daniel,
I had a look at the extents now. I think this will basically work. The problem I see is, that the database has 110 tables and all are using a globally generated OID. In my basic class I would have to list all other classes as extents of this one.
What does this mean for the performance of OJB? will OJB now query all 110 tables to find the right object?
Since I know quite easily based on the first 3 letters of the OID what type it is, can I somehow tell that OJB as a hint to search the right table?
Sebastian
Daniel Perry wrote:
What about using an extent and having both types extend it. It would pick the right class based on whichever table has an item with that primary key.
Daniel.
-----Original Message----- From: news [mailto:[EMAIL PROTECTED] Behalf Of Sebastian Sent: 02 June 2004 17:07 To: [EMAIL PROTECTED] Subject: Re: Mapping question
To simplify my question:
I have a table containing a foreign key column and the foreign key of a row points to different tables based on the first three letters of the foreign key. E.g. when it starts with "art" then it points to a record in the article table. When it starts with "cat" then it points to a category table.
This means OJB should based on the first three letters of the foreign key know what kind of object to reference.
What kind of custom mapper or converter or whatever do I have to write.
Thanks, Sebastian
Sebastian wrote:
Hi, I'm trying to map some tables with OJBs but don't know how to express their relation. Maybe someone can give me a hint.
I have three tables: articles with OID as primary key categories with OID as primary key custom_fields with OID as primary key, OID_FK as foreign key
OID is generated uniquely over all tables in a format: "first 3 letters of the table name" plus a "incrementing value". E.g. cat01,art02,art03,cus04.
An article as well as a category can have a custom field that is stored in the custom_fields table, the OID_FK is the OID of the
related article
or category. The first three letters of OID indicate the "object type" article or category.
How do I have to configure the repository.xml so that always the right object (a category or an article) is referenced by an
customField object?
Thanks in advance, Sebastian
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