我的xml代码
<?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.homework.dao.ClassMapper">
<resultMap id="classList" type="com.homework.entity.ClassEntity">
<id property="id" column="id"/>
<result column="class_title" property="title"/>
<result column="tch_id" property="tchId"/>
<result column="tch_name" property="tchName"/>
</resultMap>
<resultMap id="classCount" type="java.lang.Integer">
<result column="count"/>
</resultMap>
<!-- 注意此处resultMap的顺序 -->
<!--<select id="getList" resultMap="classCount,classList">-->
<select id="getList" resultMap="classList,classCount">
SELECT SQL_CALC_FOUND_ROWS id,class_title,tch_id,tch_name FROM class WHERE class_title LIKE
CONCAT('%',#{keyword},'%') LIMIT #{pagesize} OFFSET #{pagenum};
SELECT FOUND_ROWS() AS count;
</select>
</mapper>
由于要实现分页查询的同时获取记录条数,因此有两个select语句,两个语句有先后顺序,因此<select>标签中的resultMap属性的顺序也要注意,如果顺序颠倒了(例如注释掉的语句)就报了这个错误