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How to customize the update query? [message #1065656]

Wed, 26 June 2013 21:56

Eclipse User

Hi,

I have a requirement that it required me to customize the update query generated automatically by EclipseLink.

Since the auto generated update query has only primary key expression in the where clause, in our case, we have a database proxy sitting in between the web application and the mysql database. It can redirect the sql statement to the specified database according to the value of partition key (which is a field of the updated object).

So I need to append this field to the where clause of the update statement.

How can I do that?

Best wishes,
Oliver

Re: How to customize the update query? [message #1066632 is a reply to message #1065656]

Wed, 03 July 2013 10:03

Eclipse User

You can use a DescriptorCustomizer to set the SQL for the update query.

See,
http://wiki.eclipse.org/EclipseLink/Examples/JPA/CRUDStoredProcedures

The example uses stored procedures, but you can also give SQL, for SQL parameters are defined by #<column-name>

i.e.
descriptor.getQueryManager().setUpdateSQLString("update employee set name=#name where id=#id and key=#key")

Also you may wish to investigate EclipseLink partitioning support,

http://wiki.eclipse.org/EclipseLink/Examples/JPA/Partitioning

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