src/main/resources/mapper/StudentDao.xml

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<?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="cn.lemon.lib.mapper.StudentMapper">
  <resultMap id="BaseResultMap" type="cn.lemon.lib.entity.Student">
    <id column="id" jdbcType="INTEGER" property="id" />
    <result column="username" jdbcType="VARCHAR" property="username" />
    <result column="password" jdbcType="VARCHAR" property="password" />
    <result column="grade_id" jdbcType="INTEGER" property="gradeId" />
    <result column="sex" jdbcType="CHAR" property="sex" />
    <result column="age" jdbcType="INTEGER" property="age" />
    <result column="name" jdbcType="INTEGER" property="gradeName" />
    <result column="status" jdbcType="INTEGER" property="status" />
  </resultMap>
  <sql id="Base_Column_List">
    id, username, `password`, grade_id, sex, age, `status`
  </sql>
  <select id="getStudentListPage" resultMap="BaseResultMap">
    select student.id,username,password,grade_id,sex,age,status,grade.name
    from student,grade
    WHERE student.grade_id = grade.id
    group by student.id
    LIMIT #{page},#{limit};
  </select>
  <select id="countOfGrade" resultType="java.lang.Long">
    select IFNULL(count(id), 0)
      from student
    where grade_id = #{gradeId}
  </select>

  <select id="getStudentListOfGrade" resultMap="BaseResultMap">
    select e.id,username,password,grade_id,sex,age,status,d.name
    from student e LEFT JOIN grade d ON e.grade_id = d.id
    where grade_id = #{gradeId}
    group by e.id
    LIMIT #{page},#{limit};
  </select>

  <select id="findByUsernameAndPassword" resultMap="BaseResultMap">
    select student.id,username,password,grade_id,sex,age,status
    from student
    where username = #{username} and password = #{password}
  </select>

  <!--<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">-->
    <!--delete from student-->
    <!--where id = #{id,jdbcType=INTEGER}-->
  <!--</delete>-->
  <!--<insert id="insert" keyColumn="id" keyProperty="id" parameterType="cn.lemon.lib.vo.Student" useGeneratedKeys="true">-->
    <!--insert into student (username, `password`, grade_id, -->
      <!--sex, age, `status`)-->
    <!--values (#{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{gradeId,jdbcType=INTEGER}, -->
      <!--#{sex,jdbcType=CHAR}, #{age,jdbcType=INTEGER}, #{status,jdbcType=INTEGER})-->
  <!--</insert>-->
  <!--<insert id="insertSelective" keyColumn="id" keyProperty="id" parameterType="cn.lemon.lib.vo.Student" useGeneratedKeys="true">-->
    <!--insert into student-->
    <!--<trim prefix="(" suffix=")" suffixOverrides=",">-->
      <!--<if test="username != null">-->
        <!--username,-->
      <!--</if>-->
      <!--<if test="password != null">-->