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How can I update the primary key field in a CMP Entity Bean?

April 26, 2017bean CMP entity field key primary

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How can I update the primary key field in a CMP Entity Bean?

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CMP 2.0 entity bean. Can I write a method in CMP 2.0 Entity Bean which can retrieve some data from database (ie. is it possible to have a CMP entity bean mapped to a particular table and have a business method in it which retrieve some data from a different table)?