Hello,

I've got a problem with a many-to-many relation on the same table.
There is an operation-class which consists of predecessor and successor (both are operations as well)

There are no problems in reading from the database, but when I want to add a new operation only the operation is saved and not the relations in table "presuc", which contains the ids. I know that in "ordinary" many-to-many cases you have to use the property : inverse=true. I've already tried this but the problem was the same.

I'm using hibernate 3.

this is my code from the mapping file:



Does anyone have an idea?

I don't know why it didn't work, but it's really the same like with different tables.

Here is my code and know it works ;-)

Hi,

when using bidirectional associations I think you have to have one end that is responsible for maintaining the corresponding foreign keys (that's IDSuc and IDPre).

Your first code-sample doesn't define inverse=true, so both ends of the association would have to take care of the foreign keys, but that doesn't work (don't ask me for the reason...).

If you specify inverse=true on both ends none of them has to take care of the foeign keys, so nothing will happen on the DB - maybe that's what you tried first.

Your working sample specifies inverse=true on "successor" only, so this end won't update the foreign keys, but the "predecessor"-end will update IDSuc and IDPre in the respective DB-entries.

...at least that's how I understand all this inverse=true stuff....

Greets

piet