... 这关系到我们能否活着 It bears on our survival 表到关系类 Table To Relationship Class 对象到关系映射 Object to Relational Mapping ...
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Joined table: (Optional) the child class is mapped to a table that has a foreign key relationship to the table to which the parent is mapped.
联合表：(可选)将子类映射到与父类映射到的表具有外键关系的表。
The class tag maps the order object to the ORDERS table and has a number of sub tags that describe its properties, the ID and the order name, and a one-to-many relationship to models.Item.
class标签把ORDER对象映射到ORDERS表，还有许多子标签用于描述其属性、ID订单名称，以及同models . Item的一对多关系。
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