本文详细介绍了一系列O/R映射场景，包括一对一关联、多对一引用、一对多集合等多种关联方式，并探讨了复合主键、三级关联等高级主题。
在网上看到一个比较好的O/R指南
http://www.xylax.net/hibernate/
1. Simple Association (one to one)
2. Simple Reference (many to one)
3. Basic Collection (one to many)
4. Collection (many to many)
5. Collection (raw data)
6. Top-level Collections
7. Map
8. Entity Map
9. Subclasses
10. Joined Subclasses
11. Components
12. Collections of Components
13. Composite Id
14. Composite Index
15. Ternary Associations
1. Simple Association (one to one)
2. Simple Reference (many to one)
3. Basic Collection (one to many)
4. Collection (many to many)
5. Collection (raw data)
6. Top-level Collections
7. Map
8. Entity Map
9. Subclasses
10. Joined Subclasses
11. Components
12. Collections of Components
13. Composite Id
14. Composite Index
15. Ternary Associations
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