My deep relationship problem for JPA

[Tony Huang]

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Hi, All

I created 3 classes: Class A has a collection of class B; B has a collection of class C

When saving the instance of A to DB table, I want also save the children and grandchildren of B and C.

But I failed to do this.

 

My question is JPA support the 3 layer hierarchy?

What should I do to solve my problem?

 

Thanks

 

Tony Huang

Developer,Foundation

The Active Network,LTD (Xi’an)

 

Tony.Huang@...

Mobile [phone]

MSN hdp214@...

Skype tony.huang214

QinFengGeD201 68 Keji No. 2 Rd.

Xian, China 710075

www.ActiveNetwork.com

 

 

 

[tware]

Hi Tony,

   You should be able to do this by enabling cascading on your relationship.

   Something like this:

     @OneToMany(cascade={PERSIST})

   With this setting, when you call persist on an object, all the objects on the
other side of this relationship will be automatically be persisted.

-Tom



Tony Huang wrote:

> Hi, All
> I created 3 classes: Class A has a collection of class B; B has a
> collection of class C
> When saving the instance of A to DB table, I want also save the children
> and grandchildren of B and C.
> But I failed to do this.
>  
> My question is JPA support the 3 layer hierarchy?
> What should I do to solve my problem?
>  
> Thanks
>  
> *Tony Huang*
> Developer,Foundation
> The Active Network,LTD (Xi’an)
>  
> _Tony.Huang@... <mailto:Tony.Huang@...>
> Mobile [phone]
> MSN _hdp214@... <mailto:hdp214@...>
> Skype tony.huang214
> QinFengGeD201 68 Keji No. 2 Rd.
> Xian, China 710075
> _www.ActiveNetwork.com_ <http://www.ActiveNetwork.com>
>  
>  
>