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从上面的描述中,我们可以看出Mapper代理的用途:

解决本机模式下的硬编码

稍后简化SQL执行

第二种方法有很多优点。首先,它更安全,因为它不依赖于字符串的文字值。其次,如果你的IDE有代码补全功能,那么代码补全可以帮助你快速选择映射的SQL语句。

使用Mapper代理要求

要使用映射器代理,必须满足以下要求:

定义与SQL映射文件同名的映射器接口,并将映射器接口和SQL映射文件放在同一目录中。如下:2rsuatiiyag3380.png

将SQL映射文件的名称空间属性设置为映射器接口的完全限定名称。

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在Mapper接口中定义方法,方法名是sql映射文件中SQL语句的id,保持参数类型和返回值类型一致l5rwpp3hzyy3382.png

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