5.4.4. ORM Layer

Object-Relational Mapping is the technology for linking relational database tables to programming language objects.

Benefits of using ORM

  • Enables working with a relational DBMS by means of Java objects manipulation.

  • Simplifies programming by eliminating routine writing of SQL queries.

  • Simplifies programming by letting you load and save entire object graphs with one command.

  • Ensures easy porting of the application to different DBMS.

  • Enables use of a concise object query language – JPQL.

Shortcomings

  • Requires understanding of how ORM works.

  • Makes direct optimization of SQL and use of the DBMS specifics difficult.

CUBA uses the ORM implementation based on the EclipseLink framework.