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 Post subject: Saving Entity with foreign key to existing record.
PostPosted: Mon Dec 18, 2017 9:28 am 
Newbie

Joined: Mon Dec 18, 2017 9:18 am
Posts: 1
I am new to hibernate. I am using version 4.3.8.
An easy question for a seasoned user.

I have record A with two foreign keys to record B.primaryKey and Record C.primaryKey.
The layout of record A looks like this.
A.id
A.foreignKey to B.primaryKey
A.foreignKey to C.primaryKey
A.fieldX


Record B currently exists in the system.

Record C is a new record I want to save when I save record A.

What does the entity class for A look like and how do I get A to save without trying to cascade a save for B?

Thanks for your help.


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 Post subject: Re: Saving Entity with foreign key to existing record.
PostPosted: Wed Dec 20, 2017 5:42 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1638
Location: Romania
A is the child entity. Both B and C are its parents.

So, you should never cascade an entity state transaction from a child to a parent because the parent should exist prior to creating the child.

For more details, check out this article.

To solve your issue, either you cascade the persist from B to A if you map the relationship on B as well.

Or just issue two persist operations, one for B and one for A.

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If you liked my answer, you are going to love my High-Performance Java Persistence book and my blog as well.


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