mapper namespace怎样设置

mapper namespace是MyBatis中用来指定Mapper接口的命名空间的属性。它的设置方式是在Mapper接口的XML配置文件中使用namespace属性来指定。例如：

<mapper namespace="com.example.mapper.UserMapper">
<!-- Mapper接口中的SQL语句 -->
</mapper>

其中，com.example.mapper.UserMapper是Mapper接口的完整类名，也是命名空间的名称。在使用Mapper接口时，需要在MyBatis配置文件中配置该接口的映射关系，例如：

<mappers>
<mapper class="com.example.mapper.UserMapper"/>
</mappers>

这样，就可以在Java代码中使用UserMapper接口来执行SQL语句了。

相关问题

mapper namespace

Mapper namespace refers to the namespace in which a mapper class is defined. In the context of object-relational mapping (ORM) frameworks like MyBatis, the mapper namespace is used to identify and locate a specific mapper interface or XML file that contains SQL statements or mappings for database operations.

In MyBatis, a mapper namespace is typically declared in the mapper XML file using the `namespace` attribute. This namespace serves as a unique identifier for the mapper and is used to associate it with the corresponding Java interface or class.

For example, in a MyBatis mapper XML file, you might have:

<mapper namespace="com.example.dao.UserMapper">
    <!-- SQL statements and mappings -->
</mapper>

Here, the `namespace` attribute specifies that the mapper belongs to the `com.example.dao` package and is named `UserMapper`. This allows you to reference and use this mapper in your MyBatis configuration or Java code by using the fully qualified name `com.example.dao.UserMapper`.

mybatis中mapper namespace

在Mybatis中，mapper namespace是指mapper接口的全类名。namespace用于实现语句与接口的绑定，通过生成mapper接口的代理对象来替代DAO层的设计。如果采用面向接口的编程方式，namespace必须为mapper接口的全类名对象。这样可以确保可以通过namespace来调用对应的mapper接口方法。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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