<?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"> <mapper namespace="com.hc.business.mapper.LiveClassMapper"> <resultMap type="com.hc.business.model.LiveClass" id="LiveClassMap"> <result property="liveClassId" column="live_class_id" jdbcType="INTEGER"/> <result property="liveId" column="live_id" jdbcType="INTEGER"/> <result property="classId" column="class_id" jdbcType="INTEGER"/> </resultMap> <sql id="Base_Column_List"> live_class_id, live_id, class_id </sql> <select id="queryByLiveId" resultType="com.hc.business.model.LiveClass"> SELECT <include refid="Base_Column_List"/> FROM live_class WHERE live_id =#{liveId} </select> </mapper>