smart-reader/src/main/resources/mapper/ClassInfoMapper.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" >
<mapper namespace="com.smart.reader.dao.ClassInfoMapper">

  <select id="queryInfo" resultType="com.smart.reader.model.vo.ClassInfoVo">
    SELECT ci.* from `class_info` ci
  </select>

  <select id="detail" resultType="com.smart.reader.model.vo.ClassInfoVo">
    select ci.* from `class_info` ci where ci.id=#{id}
  </select>
</mapper>