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Re: [eclipselink-users] How to retrieve a non database field and not having it persistent
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This is not something JPA directly supports. Some possibilities are:
- Map it as transient, and lazy initialize it from the database when first
accessed.
- Map is using a @TransformationMapping
- If you can get it retrieved (are you calling the column name "SYSDATE"?),
then mark the @Column insertable=false, updatable=false to avoid writing it.
- Use a "new Date()" in Java instead.
SPHQ wrote:
>
> Using eclipselink and oracle - For example, I want to execute
> Select sysdate from dual and store the result in an attribute ( say X ) of
> a class
> and the attribute not being a field in the table.
> If I use @Transient , the value is not retrieved.
> If I do not use @transient, the value is retrieved but when I try to
> persist,
> it says 'unknow identifier'. Can somebody help ?
>
-----
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http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
EclipseLink , http://www.oracle.com/technology/products/ias/toplink/
TopLink
Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink ,
http://wiki.oracle.com/page/TopLink TopLink
Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink ,
http://www.nabble.com/EclipseLink-f26430.html EclipseLink
Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence
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