MyBatis 中实体类的属性名与表中的字段名不一致怎么处理？

港控/mmm° 2022-12-11 03:11 174阅读 0赞

1、修改 SQL，给查询字段重命名，如 将 user\_id  重命名为 userId

select user_id as userId from table

2、MyBatis 的 XML 映射文件中，使用 <resultMap> 标签，定义数据库字段名与实体 bean 的属性字段名的映射关系

< select id="getUser" parameterType="int" resultMap="”UserMap”">
        select * from user where user_id=#{id}
    < /select>
     
    < resultMap type=”User” id=”UserMap”>
        <!–- id 标签映射主键字段 -–>
        < id property=”id” column=user_id>
    
        <!–- result 标签映射非主键字段，property 为实体 bean 属性名，column 为数据库表中字段名 -–>
        < result property=“userName” column =”user_name”/>
    < /reslutMap>

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