--- 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
____________________________________________________________________________________
Looking for last minute shopping deals?
Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping
This archive was generated by hypermail 2.0.0 : Sat Dec 22 2007 - 18:43:53 EST