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foreign key constraint

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AdmiralFreezbee

Post subject: foreign key constraint

Posted: Wed Mar 23, 2005 4:37 am

Newbie

Joined: Wed Mar 23, 2005 4:29 am
Posts: 7

Hi,

I got a real basic question. I'm working with Hibernate 2 and a mcKoi database.
I have two classes (A and B). Class A has an attribute (say: b1) that is an objec of class B. Now in my mapping I wrote:
<many-to-one name="b1" class="B" column="b1"/>

The problem I have is when I want to save an object of Class A. McKoi gives a foreign key constraint exception, saying that their isn't a primary key of B that matches the foreign key in A.

I can solve this by saving B first in my code, but I was wondering if there's a way to do this in the mapping. So that Hibernate does that automatically.

Thanks in advance!

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drj

Post subject:

Posted: Wed Mar 23, 2005 4:50 am

Expert

Joined: Fri Nov 07, 2003 4:24 am
Posts: 315
Location: Cape Town, South Africa

Make the relationship nullable:

Code:

        <many-to-one
            name="b1"
            class="B"
            foreign-key="b1_fk1"
            column="b1"
            not-null="false"
        />

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