Object-Relational Mapping is the technology for linking relational database tables to programming language objects.
- Benefits of using ORM:
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Allows working with a relational DBMS by means of Java objects manipulation.
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Simplifies programming by eliminating routine writing of SQL queries.
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Simplifies programming by letting you extract and save entire object graphs with one command.
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Ensures easy porting of the application to different DBMS.
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Uses a concise object query language – JPQL.
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Optimizes the number of SQL requests for insert and update.
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- Shortcomings:
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Requires understanding of specifics of working with ORM.
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Does not allow to directly optimize SQL or use specifics of the DBMS.
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CUBA uses the ORM implementation according to Java Persistence API standard based on Apache OpenJPA framework.
