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feat(class): 实现班级列表分页查询功能

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- 新增班级后端分页接口及相关服务实现
- 实现班级与年级关联数据查询及映射
- 新增分页请求和响应VO类支持前后端数据传输
- 修改前端class.vue，增加班级列表分页展示组件
- 增加前端分页逻辑及状态管理，支持切换页码和页面大小
- 创建GradeClassDO实体及对应Mapper实现关联查询
- 优化数据库Mapper XML，增加分页查询及计数SQL语句
- 调整MyBatis配置生成grade_class表实体类和Mapper接口
This commit is contained in:
lbw
2025-12-14 18:35:00 +08:00
parent 0ad8edbac1
commit ef48923422
15 changed files with 296 additions and 8 deletions
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44
enlish-service/src/main/java/com/yinlihupo/enlish/service/controller/ClassController.java Normal file
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package com.yinlihupo.enlish.service.controller;
import com.yinlihupo.enlish.service.domain.dataobject.ClassDO;
import com.yinlihupo.enlish.service.domain.dataobject.GradeDO;
import com.yinlihupo.enlish.service.model.vo.classs.FindClassReqVO;
import com.yinlihupo.enlish.service.model.vo.classs.FindClassRspVO;
import com.yinlihupo.enlish.service.service.ClassService;
import com.yinlihupo.framework.biz.operationlog.aspect.ApiOperationLog;
import com.yinlihupo.framework.common.response.PageResponse;
import jakarta.annotation.Resource;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
import java.util.Map;
@RequestMapping("/class/")
@RestController
public class ClassController {
@Resource
private ClassService classService;
@PostMapping("list")
@ApiOperationLog(description = "查询班级列表")
public PageResponse<FindClassRspVO> findClasses(@RequestBody FindClassReqVO findClassReqVO) {
Integer page = findClassReqVO.getPage();
Integer pageSize = findClassReqVO.getPageSize();
int total = classService.getClassCount();
List<ClassDO> classList = classService.findClassList(page, pageSize);
Map<Integer, GradeDO> classId2GradeMap = classService.findClassId2GradeMap(classList.stream().map(ClassDO::getId).toList());
List<FindClassRspVO> findClassRspVOS = classList.stream().map(classDO -> FindClassRspVO.builder()
.id(classDO.getId())
.title(classDO.getTitle())
.gradeId(classId2GradeMap.get(classDO.getId()) != null ? classId2GradeMap.get(classDO.getId()).getId() : 0)
.gradeName(classId2GradeMap.get(classDO.getId()) != null ? classId2GradeMap.get(classDO.getId()).getTitle() : "")
.build()).toList();
return PageResponse.success(findClassRspVOS, page, total, pageSize);
}
}

21
enlish-service/src/main/java/com/yinlihupo/enlish/service/domain/dataobject/GradeClassDO.java Normal file
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package com.yinlihupo.enlish.service.domain.dataobject;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
@AllArgsConstructor
@NoArgsConstructor
@Data
@Builder
public class GradeClassDO {
private Integer id;
private Integer classId;
private Integer gradeId;
}

7
enlish-service/src/main/java/com/yinlihupo/enlish/service/domain/mapper/ClassDOMapper.java
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@@ -1,8 +1,15 @@
package com.yinlihupo.enlish.service.domain.mapper;
import com.yinlihupo.enlish.service.domain.dataobject.ClassDO;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface ClassDOMapper {
ClassDO selectClassDOById(Integer id);
List<ClassDO> selectClassDOList(@Param("startIndex") Integer startIndex, @Param("pageSize") Integer pageSize);
Integer selectClassDOCount();
}

10
enlish-service/src/main/java/com/yinlihupo/enlish/service/domain/mapper/GradeClassDOMapper.java Normal file
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@@ -0,0 +1,10 @@
package com.yinlihupo.enlish.service.domain.mapper;
import com.yinlihupo.enlish.service.domain.dataobject.GradeClassDO;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface GradeClassDOMapper {
List<GradeClassDO> selectByClassIds(@Param("classIds") List<Integer> classIds);
}

5
enlish-service/src/main/java/com/yinlihupo/enlish/service/domain/mapper/GradeDOMapper.java
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@@ -1,8 +1,13 @@
package com.yinlihupo.enlish.service.domain.mapper;
import com.yinlihupo.enlish.service.domain.dataobject.GradeDO;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface GradeDOMapper {
GradeDO selectById(Integer id);
List<GradeDO> selectByGradeIds(@Param("gradeIds") List<Integer> gradeIds);
}

16
enlish-service/src/main/java/com/yinlihupo/enlish/service/model/vo/classs/FindClassReqVO.java Normal file
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package com.yinlihupo.enlish.service.model.vo.classs;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
@AllArgsConstructor
@NoArgsConstructor
@Data
@Builder
public class FindClassReqVO {
Integer page;
Integer pageSize;
}

18
enlish-service/src/main/java/com/yinlihupo/enlish/service/model/vo/classs/FindClassRspVO.java Normal file
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package com.yinlihupo.enlish.service.model.vo.classs;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
@AllArgsConstructor
@NoArgsConstructor
@Data
@Builder
public class FindClassRspVO {
private Integer id;
private String title;
private Integer gradeId;
private String gradeName;
}

10
enlish-service/src/main/java/com/yinlihupo/enlish/service/service/ClassService.java
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@@ -1,8 +1,18 @@
package com.yinlihupo.enlish.service.service;
import com.yinlihupo.enlish.service.domain.dataobject.ClassDO;
import com.yinlihupo.enlish.service.domain.dataobject.GradeDO;
import java.util.List;
import java.util.Map;
public interface ClassService {
ClassDO findClassById(Integer id);
List<ClassDO> findClassList(Integer page, Integer pageSize);
int getClassCount();
Map<Integer, GradeDO> findClassId2GradeMap(List<Integer> classIds);
}

54
enlish-service/src/main/java/com/yinlihupo/enlish/service/service/classs/ClassServiceImpl.java
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@@ -1,19 +1,73 @@
package com.yinlihupo.enlish.service.service.classs;
import com.yinlihupo.enlish.service.domain.dataobject.ClassDO;
import com.yinlihupo.enlish.service.domain.dataobject.GradeClassDO;
import com.yinlihupo.enlish.service.domain.dataobject.GradeDO;
import com.yinlihupo.enlish.service.domain.mapper.ClassDOMapper;
import com.yinlihupo.enlish.service.domain.mapper.GradeClassDOMapper;
import com.yinlihupo.enlish.service.domain.mapper.GradeDOMapper;
import com.yinlihupo.enlish.service.service.ClassService;
import jakarta.annotation.Resource;
import org.springframework.stereotype.Service;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
@Service
public class ClassServiceImpl implements ClassService {
@Resource
private ClassDOMapper classDOMapper;
@Resource
private GradeClassDOMapper gradeClassDOMapper;
@Resource
private GradeDOMapper gradeDOMapper;
@Override
public ClassDO findClassById(Integer id) {
return classDOMapper.selectClassDOById(id);
}
@Override
public List<ClassDO> findClassList(Integer page, Integer pageSize) {
return classDOMapper.selectClassDOList((page - 1) * pageSize, pageSize);
}
@Override
public int getClassCount() {
return classDOMapper.selectClassDOCount();
}
@Override
public Map<Integer, GradeDO> findClassId2GradeMap(List<Integer> classIds) {
List<GradeClassDO> gradeClassDOS = gradeClassDOMapper.selectByClassIds(classIds);
List<GradeDO> gradeDOS = gradeDOMapper.selectByGradeIds(gradeClassDOS.stream().map(GradeClassDO::getGradeId).toList());
HashMap<Integer, GradeDO> gradeId2GradeDO = gradeDOS.stream().collect(Collectors.toMap(
GradeDO::getId,
gradeDO -> gradeDO,
(oldValue, newValue) -> newValue, // mergeFunction：处理键冲突（比如重复键时保留新值）
HashMap::new // mapSupplier：指定返回HashMap类型
));
return gradeClassDOS.stream().collect(Collectors.toMap(
GradeClassDO::getClassId, // key：GradeClassDO的classId
// 修正后的valueMapper：lambda表达式处理映射逻辑
gradeClassDO -> {
// 可选：处理空值，避免返回null（根据业务需求调整）
Integer gradeId = gradeClassDO.getGradeId();
GradeDO gradeDO = gradeId2GradeDO.get(gradeId);
if (gradeDO == null) {
// 业务上的空值处理，比如抛出异常、返回默认对象等
throw new IllegalArgumentException("未找到gradeId为" + gradeId + "的GradeDO");
// 或者：return new GradeDO(); // 返回默认对象
}
return gradeDO;
},
(oldValue, newValue) -> newValue, // 键冲突保留新值
HashMap::new // 指定返回 HashMap
));
}
}

2
enlish-service/src/main/resources/generatorConfig.xml
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@@ -45,7 +45,7 @@
targetProject="src/main/java"/>
<!-- 需要生成的表-实体类 -->
<table tableName="grade" domainObjectName="GradeDO"
<table tableName="grade_class" domainObjectName="GradeClassDO"
enableCountByExample="false"
enableUpdateByExample="false"
enableDeleteByExample="false"

11
enlish-service/src/main/resources/mapper/ClassDOMapper.xml
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@@ -12,5 +12,16 @@
where id = #{id}
</select>
<select id="selectClassDOList" resultMap="BaseResultMap">
select *
from `class`
limit #{startIndex}, #{pageSize}
</select>
<select id="selectClassDOCount" resultType="java.lang.Integer">
select count(1)
from `class`
</select>
</mapper>

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enlish-service/src/main/resources/mapper/GradeClassDOMapper.xml Normal file
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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="com.yinlihupo.enlish.service.domain.mapper.GradeClassDOMapper">
<resultMap id="BaseResultMap" type="com.yinlihupo.enlish.service.domain.dataobject.GradeClassDO">
<id column="id" jdbcType="INTEGER" property="id" />
<result column="class_id" jdbcType="INTEGER" property="classId" />
<result column="grade_id" jdbcType="INTEGER" property="gradeId" />
</resultMap>
<select id="selectByClassIds" resultMap="BaseResultMap">
select * from grade_class where class_id in
<foreach collection="classIds" item="classId" separator="," open="(" close=")">
#{classId}
</foreach>
</select>
</mapper>

8
enlish-service/src/main/resources/mapper/GradeDOMapper.xml
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@@ -12,5 +12,13 @@
from grade
where id = #{id}
</select>
<select id="selectByGradeIds" resultMap="BaseResultMap">
select *
from grade
where id in
<foreach collection="gradeIds" item="gradeId" separator="," open="(" close=")">
#{gradeId}
</foreach>
</select>
</mapper>