2.mybatis 的列名与数据库字段不对应

mybatis 的列名与数据库字段不对应

　　1.别名

　　 映射文件 ： BlogMapper.xml

<mapper namespace="com.xms.mybatis.mapper.BlogMapper">

<select id="selectBlog" parameterType="int" resultType="Blog">

select

`id`,

`title`,

`author_id` as authorId,

`state`,

`featured`,

`style`

from Blog where id = #{id}

</select>

接口 ： mapper.xml

Blog selectBlog(Integer id);

测试类 ： BolgMapperTest

@Test

public void testSelectBlog(){

 

SqlSession session = MybatisUtil.getSqlSession();

BlogMapper blogMapper = session.getMapper(BlogMapper.class);

Blog blog = blogMapper.selectBlog(1);

session.close();

System.out.println("<<<<<------------>>>>>:"+blog);

 

}

　　2.ResultMap

映射文件 ： BlogMapper.xml

<mapper namespace="com.xms.mybatis.mapper.BlogMapper">

<resultMap type="Bolg" id="blogResultMap">

<result column="author_id" property="aothorId"/>

</resultMap>

<select id="selectBlog2" parameterType="int" resultMap="blogResultMap">

select * from Blog where id = #{id}

</select>

测试类 ： BolgMapperTest

@Test

public void testSelectBlog2(){

 

SqlSession session = MybatisUtil.getSqlSession();

BlogMapper blogMapper = session.getMapper(BlogMapper.class);

Blog blog = blogMapper.selectBlog2(1);

session.close();

System.out.println("<<<<<------------>>>>>:"+blog);

 

}

 

 

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