还可以为具有组合键的实体创建一个主键类。

You can also create a primary key class for entities that have composite keys.

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Entity类需要一个主键。

An Entity class needs a primary key.

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该键类包含bean的唯一主键实现。

The key class contains the unique primary key implementation for the bean.

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该键类包含bean的唯一主键实现。

The key class contains the unique primary key implementation for the bean.

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