lbw
e5fbb445cf
- 新增StudentDOMapper接口方法selectStudentCountByClassId，用于查询班级下学生数量 - 在ClassServiceImpl中注入StudentDOMapper - 删除班级时先判断班级下是否存在学生，若存在则抛出异常防止删除 - 更新StudentDOMapper.xml，添加对应的SQL查询语句selectStudentCountByClassId
71 lines
2.5 KiB
XML
71 lines
2.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.yinlihupo.enlish.service.domain.mapper.StudentDOMapper">
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<resultMap id="BaseResultMap" type="com.yinlihupo.enlish.service.domain.dataobject.StudentDO">
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<id column="id" jdbcType="INTEGER" property="id" />
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<result column="name" jdbcType="VARCHAR" property="name" />
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<result column="class_id" jdbcType="INTEGER" property="classId" />
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<result column="grade_id" jdbcType="INTEGER" property="gradeId" />
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<result column="initial_vocabulary_size" jdbcType="INTEGER" property="initialVocabularySize" />
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<result column="current_vocabulary_size" jdbcType="INTEGER" property="currentVocabularySize" />
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<result column="is_deleted" jdbcType="INTEGER" property="isDeleted"/>
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<result column="start_time" jdbcType="TIMESTAMP" property="startTime" />
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</resultMap>
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<select id="selectStudentDOListByClassIdAndGradeId" resultMap="BaseResultMap">
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select *
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from student
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where 1 = 1
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<if test="classId != null">
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AND class_id = #{classId}
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</if>
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<if test="gradeId != null">
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AND grade_id = #{gradeId}
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</if>
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<if test="name != null">
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AND name like concat('%', #{name}, '%')
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</if>
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and is_deleted = 0
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order by start_time desc
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LIMIT #{startIndex}, #{pageSize}
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</select>
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<select id="selectStudentCount">
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select count(1)
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from student
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</select>
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<select id="selectStudentById" resultMap="BaseResultMap">
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select *
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from student
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where id = #{id}
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</select>
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<select id="selectStudentDOListByIds" resultMap="BaseResultMap">
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select *
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from student
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where id in
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<foreach item="id" collection="ids" separator="," open="(" close=")" index="index">
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#{id}
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</foreach>
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</select>
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<insert id="insert" useGeneratedKeys="true" keyProperty="id">
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insert into student
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(name, class_id, grade_id, is_deleted, start_time)
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values (#{name}, #{classId}, #{gradeId}, 0, #{startTime})
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</insert>
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<update id="deleteById">
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update student
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set is_deleted = 1
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where id = #{id}
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</update>
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<select id="selectStudentCountByClassId" resultType="java.lang.Integer">
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select count(1)
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from student
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where class_id = #{classId}
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and is_deleted = 0
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</select>
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</mapper> |