mysql insert problem

[Guido Beutler <gu...@hrs.de>]

Hello,

I'm using ojb rc5 with mysql 4.0.18 under linux.
OJB runs inside of a jboss-3.2.3.
I have a sample table :

create table a (
id int not null,
ref char(3) not null references b,
primary key (id,ref)
)

create table b (
ref char(3) not null,
primary key (ref)
);

at the corresponding class I have

class a (
int id;
String ref;
b b
);

At the repository I have a reference desriptor from a to b.

   <reference-descriptor name="b" class-ref="b" proxy="false" 
refresh="false" auto-retrieve="false" auto-update="false" 
auto-delete="false">
      <foreignkey field-id-ref="2"/>
   </reference-descriptor-->

Now my problem. As shown at the reference descriptor I do not 
automatically load b.
At a insert on a the reference on b must be set, otherwise mysql reports 
a arror that ref can not be null.
If I comment out the reference descriptor at the repository everything 
works fine.

If ref is not a String (char) I do not have to set the reference to b. 
Where is the difference?
Why ojb uses the reference field to b in case of ref is a String and and 
uses the attribuite ref
in case ref is of type int ? Is it because of Sting is a object ant int not?
I would like to run mass inserts and would like to avoid resolving the 
references.

best regards,

Guido


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