one2one.CardMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 这里要写IUserDao的路径哦 -->
<mapper namespace="com.qianfeng.one2one.ICardDao">
    
    <resultMap type="Card" id="cardMap">
        <id property="cid" column="cid"/>
        <!-- 其他字段的映射关系 -->
        <result property="cname" column="cname"/>
    </resultMap>
    
    
    <select id="findById" parameterType="int" resultMap="cardMap">
        select * from t_card where cid=#{cid}
    </select>
</mapper>