Mapper(Namespace)
时间: 2024-05-25 13:17:52 浏览: 12
A mapper is a software component that translates data between different formats, structures, or namespaces. In the context of namespaces, a mapper is used to map data from one namespace to another. A namespace is a container that holds a set of identifiers (such as variable names, function names, etc.) used to organize and differentiate elements in a software system. Mapping between namespaces is necessary when two different software systems use different namespace conventions or when there are conflicts between identifiers in different namespaces. Mappers can be created manually or using automated tools, such as code generators or transformation engines.
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:
```xml
<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>
#### 引用[.reference_title]
- *1* *3* [mybatis中的namespace及mapper](https://blog.csdn.net/biliangliang/article/details/84034262)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
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