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From "Patrick Linskey" <plins...@gmail.com>
Subject Re: How to map multiple properties to same column as writable in jpa
Date Fri, 27 Jul 2007 06:24:31 GMT
Hi,

This forum is for the OpenJPA product, so we don't have much
experience with Toplink.

However, from an OpenJPA standpoint, you can map the same column to
multiple fields without a problem, as long as you don't attempt to set
the fields to different values during the same transaction.

-Patrick

On 7/26/07, saravanan_tvm <skumar_rect2000@yahoo.com> wrote:
>
> Hi,
> I am using toplink from oracle to support JPA.
> I have the following requirement...
> i have to map same column for multiple properties using @joincolumn
> annotation.. eg its something like this
>
> @joincolumn(name="PARENT_RECORD_ID")
> private Drug drug
>
> @joincolumn(name="PARENT_RECORD_ID")
> private Reaction reaction
>
> PARENT_RECORD_ID is nothing but primary key of parent table.
> but while accessing the application i am getting the following exception....
>
>  MULTIPLE_WRITE_MAPPINGS_FOR_FIELD
>
> Cause: Multiple writable mappings for the field fieldName are defined in the
> descriptor. Exactly one must be defined as writable; the others must be
> specified as read-only. When multiple write mappings are defined for the
> field, TopLink is unable to choose the appropriate mapping for writing the
> value of the field in the database row. Therefore, the exception is raised
> during the validation process of descriptors.
>
> Action: Make one of those mappings read-only
>
> But i cannot make read only, if i make read only then while inserting new
> records it will be problem
>
> please can anyone provide the solution for this...
> Regards,
> Saravanan.
>
> --
> View this message in context: http://www.nabble.com/How-to-map-multiple-properties-to-same-column-as-writable-in-jpa-tf4155235.html#a11822480
> Sent from the OpenJPA Developers mailing list archive at Nabble.com.
>
>


-- 
Patrick Linskey
202 669 5907

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