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View as JoinTable causes delete problem [message #903670]

Fri, 24 August 2012 16:06

Eclipse User

I have a one-to-many mapping that is using an Oracle view as the JoinTable because the relationship between the two objects is complex inside of the database. The mapping is here:

<one-to-many name="bars" fetch="EAGER">
<join-table name="FOO_BARS_VIEW">
<join-column name="FOOID" referenced-column-name="ID" insertable="false" updatable="false" nullable="false"/>
<inverse-join-column name="BARID" referenced-column-name="ID" insertable="false" updatable="false" nullable="false"/>
</join-table>
</one-to-many>

This works fine for queries, etc.

However, when I attempt to delete a FOO object, eclipselink is cascading the delete into the view:
DELETE FROM FOO_BARS_VIEW WHERE (FOOID = ?)
bind => [301]

This statement fails, since you can't delete from a view.

Is there a way to tell JPA not to cascade the delete into the JoinTable?

Re: View as JoinTable causes delete problem [message #903998 is a reply to message #903670]

Mon, 27 August 2012 10:17

Eclipse User

I assumed that marking all fields as insertable=false, updatable=false would make the mapping read only, but it looks like you will need to use a customizer to get the mapping and mark it directly using the setIsReadOnly(true) method.

Descriptor customizers are described here:
http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Customizers

with the following code being required:
descriptor.getMappingForAttributeName("bars")).setIsReadOnly(true);

Best Regards,
Chris

[Updated on: Mon, 27 August 2012 10:29] by Moderator

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