外层

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  3. <!--namespace: 接口类路径-->
  4. <mapper namespace="com.genew.upm.mapper.PmMapper">
  5. </mapper>

内容节点

<resultMap type="user" id="userResultMap">
        <!-- 指定主键用id, column为表列名， property 为类属性 -->
        <id property="id" column="id"/>
        <!-- 普通属性用 result -->
        <result property="name" column="u_name"/>
        <result property="sex" column="sex"/>
        <result property="age" column="_age"/>
        <result property="description" column="description"/>
    </resultMap>

当数据库列名和实体类字段名不一致时，进行名称映射