数据库锁

原創 放羊的大飞 2020-04-02 02:35

一、数据库层面支持高并发系统

 

二、数据库锁

 

三、ORM框架

    1. Object Relational Mapping 对象关系映射，描述对象和数据库之间映射的元数据，将程序中的对象自动持久化到关系数据库中，数据持久层框架。(对象和数据库之间的桥梁)

    2. 类 --> 表       
        类的属性 --> 表字段         
        类的对象 --> 表中的一条数据

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