Mapping complex data types

["Hoell. Uwe" <Ho...@aeb.de>]

Is it possible to have an complex type for an field (or any fields) and map
the fields of the complex type as separat columns to the database-table?

Public Class A {
	public String a1;
	public B b1;
	public B b2;
... }

Public class B {
	public String b1;
	public String b2;
... }

Class A should then be mapped to a table like:
tableA(a1, b1b1, b1b2, b2b1, b2b2, ...)


If it's possible, what's about foreign keys for fields in class B, and can I
have nested complex types (means class B has an attribut of type class (or
an interface?) C...)



Thanks,

Uwe Hoell
--
AEB GmbH, www.aeb.de
D-70597 Stuttgart, Julius-Hölder-Str. 39
Tel. +49/711/7 28 42-268, Fax -333, hoell@aeb.de

Re: Mapping complex data types

[Thomas Mahler <th...@apache.org>]

Hi Uwe,

Hoell. Uwe wrote:
> Is it possible to have an complex type for an field (or any fields) and map
> the fields of the complex type as separat columns to the database-table?
> 
> Public Class A {
> 	public String a1;
> 	public B b1;
> 	public B b2;
> ... }
> 
> Public class B {
> 	public String b1;
> 	public String b2;
> ... }
> 
> Class A should then be mapped to a table like:
> tableA(a1, b1b1, b1b2, b2b1, b2b2, ...)
> 

Yes that is possible! It can be done with the NestedPersistentFieldImpl.

> 
> If it's possible, what's about foreign keys for fields in class B, and can I
> have nested complex types (means class B has an attribut of type class (or
> an interface?) C...)
> 

Yes should be possible too. You can use normal FieldDescriptor elements 
and use the foolowing syntax to describe the nested attributes:
<field-descriptor
     name="b1->b1b1"
     ...
/>

Uwe: If I can help you with your evaluation directly just let me know.
You may post your questions in german, which may things simpler for both 
of us ;-)

cheers,
Thomas


> 
> 
> Thanks,
> 
> Uwe Hoell
> --
> AEB GmbH, www.aeb.de
> D-70597 Stuttgart, Julius-Hölder-Str. 39
> Tel. +49/711/7 28 42-268, Fax -333, hoell@aeb.de
> 
> --
> To unsubscribe, e-mail:   <ma...@jakarta.apache.org>
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> 
> 
> 
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