- EJB 3 Developer Guide
- Michael Sikora
- 68字
- 2021-07-02 11:34:56
Chapter 4. Object/Relational Mapping
Entities do not exist in isolation and are usually associated with other entities. In this chapter we examine how to map these associations onto a relational database. We will cover the following topics:
- One-to-one, one-to-many, and many-to-many associations.
- Default object/relational mapping values.
- Overriding the default object/relational mapping values.
- The
@Embedded, @Embeddable, @Enumerated, and@MapKeyannotations. - Composite primary keys
- Entity inheritance mapping strategies
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