Any feedback on this topic? I read the mentioned
"Handling Inheritance" article, if I shouldn't use the
table names, how can I check for my category concepts
as I mentioned? Since there are multiple tables that
are the categories.
I am a little unclear how using
ObjectId.getReplacementIdMap().put(...) might help as
mentioned in an earlier post. Is there any other
information I can better provide to better explain my
approach. How is this safer then using my own ObjectId
object and settings its id?
Thanks.
--- "Terrence A. Pietrondi" <tepietrond..ahoo.com>
wrote:
>
> --- Aristedes Maniatis <ar..sh.com.au> wrote:
>
> > The simplest way to have Cayenne handle PK
> > generation is to follow the
> > instructions here:
> >
> >
>
http://cayenne.apache.org/doc/generate-primary-key-support.html
> >
> > That will implement a solution which is thread
> safe
> > and portable
> > between databases. I don't believe your solution
> > would be thread safe.
> >
>
> Here is the trick, the work I am doing is on an
> existing database (Oracle) and I do not have access
> to
> modify the existing schema. It could be possible
> that
> I go through a review with our database developer,
> but
> I am trying to solve the problem within the
> constrains
> of his design. For whatever reason, he chose not to
> implement auto-key generation and is expecting that
> to
> take place in the application code. Whether that is
> a
> good design decision or not is arguable, but I'd
> like
> to continue the implementation of my solution
> without
> database modifications. And therefore, key
> generation
> is going to have to take place in the application
> code. Hope that is not too confusing.
>
> > What is it you are wanting to do here? One of the
> > primary purposes of
> > an ORM is to insulate the user from the database
> > schema, allowing you
> > to refactor the database naming and schema without
> > touching your Java
> > code. Hardcoding in database field names may not
> be
> > in the best
> > interests of this approach. Also the comments in
> > your example suggest
> > a one to one mapping between databases tables
> > (DbEntity) and
> > ObjEntity. This is not always true in Cayenne:
> >
> >
>
http://cayenne.apache.org/doc/handling-inheritance.html
> >
>
> I have a service that has a method to set a value
> for
> an entry of a member on a table. This method is
> "annotating" a "member" of a "category"
> (conceptually). And so, when using the "annotate"
> method, of the arguments for this method are a
> "rule"
> and a "value". A "rule" is a column on the database
> table, and a table represents a "category". I need
> to
> map this "rule" to the correct property name in
> Cayenne so I can set it properly for the correct
> "member". To be clear, I am editing an existing
> entry
> in the table, but I am targeting a specific column
> to
> set, and I need to map from the column name to the
> property name.
>
> Thanks.
>
>
>
> Terrence A. Pietrondi
> http://del.icio.us/tepietrondi
>
>
>
>
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Terrence A. Pietrondi
http://del.icio.us/tepietrondi
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This archive was generated by hypermail 2.0.0 : Thu Dec 27 2007 - 09:47:16 EST