django 4.0 框架之ORM
2022-04-06sad creeper
简称：ORM，O/RM，O/R Mapping
1.特征： 1、数据表 到 类(class)的映射 将数据表 自动 生成一个 class 类 同时也允许将一个class类 自动生成数据库中的一张表 2、数据类型的映射 允许将表中的字段的数据类型 自动 映射成编程语言中对应的数据类型
也允许将编程语言的数据类型 自动 映射成 表中的字段的数据类型
3、关系映射
在编程语言中允许将表与表之间的关系映射出来
表与表之间的关系也可以自动映射到编程语言的class 中
数据库表中的关联关系：
一对一，一对多，多对多———————————————— 原文链接：https://blog.csdn.net/awaken_gx/article/details/123780543
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