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Best way to generate Primary Key with CMP- Entity Bean (EJB 2.0)

 
Ranch Hand
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Hi,

Which is the best way to generate a primary key. Say, for example I have one table Student and in that I have a student Id. Now how can I generate it as an automated key.

I don't want to use sequencing or auto increments. I want to do with a business logic, so how can I achieve that?
 
Greenhorn
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What kind of database system?
 
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