These maps simply join the correct place in the database to the field of the object that you require.

这些映射只是将数据库中的正确位置与您请求的对象的字段连接起来。

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But before we do, this, we will demonstrate the ability of being able to disconnect from the database to perform an offline join operation.

但是在这样做之前，我们先来演示一下断开与数据库的连接然后执行离线连接操作的能力。

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This means you can get all the benefits of typical SQL join queries without the burden of predefining their relationships in the database layer.

这意味着您能够获得典型的 SQL 联合查询的所有好处，但又不需要在数据库层预定义它们的关系。

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