• 1. composite key class: 联合主键类
• 2. Composite Primary Key Class: 主键类

• 1.Next up in Listing 2 is the @IdClass annotation, which defines the composite key class reference.
  清单 2 中的下一个注释是 @IdClass，它定义组合键类引用。
  dict.yoduao.com
• 2.You can also create a primary key class for entities that have composite keys.
  还可以为具有组合键的实体创建一个主键类。
  dict.yoduao.com

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