微服务项目-＞在线oj系统(Java-Spring)--竞赛管理

表结构创建

create table tb_exam (
exam_id bigint unsigned not null comment '竞赛id（主键）',
title varchar(50) not null comment '竞赛标题',
start_time datetime not null comment '竞赛开始时间',
end_time datetime not null comment '竞赛结束时间',
status tinyint not null default '0' comment '是否发布 0：未发布 1：已发布',
-- exam_question 这个竞赛下所有的题目都存进来并且用&分隔开 10
create_by bigint unsigned not null comment '创建人',
create_time datetime not null comment '创建时间',
update_by bigint unsigned comment '更新人',
update_time datetime comment '更新时间',
primary key(exam_id)
);
create table tb_exam_question (
exam_question_id bigint unsigned not null comment '竞赛题目关系id（主键）',
question_id bigint unsigned not null comment '题目id（主键）',
exam_id bigint unsigned not null comment '竞赛id（主键）',
question_order int not null comment '题目顺序',
create_by bigint unsigned not null comment '创建人',
create_time datetime not null comment '创建时间',
update_by bigint unsigned comment '更新人',
update_time datetime comment '更新时间',
primary key(exam_question_id)
);

竞赛列表

后端代码开发

Controller

@RestController
@RequestMapping("/exam")
public class ExamController extends BaseController {

    @Autowired
    private IExamService examService;
    //exam/list
    @GetMapping("/list")
    public TableDataInfo list(ExamQueryDTO examQueryDTO) {
        return getDataTable(examService.list(examQueryDTO));
    }
}

前端传入参数（DTO）

因为需要查询，所以需要传入查询条件（标题，开始时间，结束时间）

因为是分页查询，所以需要继承之前写的pageDomain

返回值类型：TableDataInfo和之前的题库列表一样

Service

首先是之前使用的分页插件的使用，然后就是调用mapper进行查询

前端返回值（VO）

注解的作用：

它会将 Long 类型的 examId 先转换为字符串，然后再进行序列化。

（由于雪花算法产生的值会超过Long的范围）

在 JavaScript 等语言中，JavaScript 的 Number 类型在处理非常大的整数时，可能会出现精度丢失的情况 。将 Java 中的 Long 类型（尤其是比较大的 Long 值）序列化为字符串，可以避免在前端处理时出现的精度问题。

@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss") 是 Jackson 库中的注解，用于指定 LocalDateTime 类型的 endTime 字段在序列化为 JSON 时的日期时间格式，这里设置为 "年 - 月 - 日 时：分: 秒" 的格式，能让日期时间数据在 JSON 传输时按照指定格式呈现，方便前后端对日期时间格式的统一处理。

因为我们数据库中的数据为int类型，但是我们可以通过多表查询，将管理员匿称返回给前端，所以用String类型

Mapper

由于我们这里查询条件比较繁琐，所以我们这里使用xml方式来解决

<?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.bite.system.mapper.exam.ExamMapper">

    <select id="selectExamList" resultType="com.bite.system.model.exam.vo.ExamVO">
        SELECT
        te.exam_id,
        te.title,
        te.start_time,
        te.end_time,
        te.create_time,
        ts.nick_name as create_name,
        te.status
        FROM
        tb_exam te
        left join
        tb_sys_user ts
        on
        te.create_by = ts.user_id
        <where>
            <if test="title !=null and title !='' ">
                AND te.title LIKE CONCAT('%',#{title},'%')
            </if>
            <if test="startTime != null and startTime != '' ">
                AND te.start_time >= #{startTime}
            </if>
            <if test="endTime != null and endTime != ''">
                AND te.end_time &lt;= #{endTime}
            </if>
        </where>
        ORDER BY
        te.create_time DESC
    </select>
</mapper>

请求测试

前端代码开发

页面半成品代码

<template>
  <el-form inline="true">
    <el-form-item label="创建日期">
      <el-date-picker v-model="datetimeRange" style="width: 240px" type="datetimerange" range-separator="至"
        start-placeholder="开始日期" end-placeholder="结束日期"></el-date-picker>
    </el-form-item>
    <el-form-item label="竞赛名称">
      <el-input v-model="params.title" placeholder="请您输入要搜索的竞赛名称" />
    </el-form-item>
    <el-form-item>
      <el-button @click="onSearch" plain>搜索</el-button>
      <el-button @click="onReset" plain type="info">重置</el-button>
      <el-button type="primary" :icon="Plus" plain @click="onAddExam">添加竞赛</el-button>
    </el-form-item>
  </el-form>
  <!-- 表格 -->
  <el-table height="526px" :data="examList">
    <el-table-column prop="title" label="竞赛标题"/>
    <el-table-column prop="startTime" width="180px" label="竞赛开始时间" />
    <el-table-column prop="endTime" width="180px" label="竞赛结束时间" />
    <el-table-column label="是否开赛" width="100px">
      <template #default="{ row }">
        <div v-if="!isNotStartExam(row)">
          <el-tag type="warning">已开赛</el-tag>
        </div>
        <div v-else>
          <el-tag type="info">未开赛</el-tag>
        </div>
      </template>
    </el-table-column>
    <el-table-column prop="status" width="100px" label="是否发布">
      <template #default="{ row }">
        <div v-if="row.status == 0">
          <el-tag type="danger">未发布</el-tag>
        </div>
        <div v-if="row.status == 1">
          <el-tag type="success">已发布</el-tag>
        </div>
      </template>
    </el-table-column>
    <el-table-column prop="createName" width="140px" label="创建用户" />
    <el-table-column prop="createTime" width="180px" label="创建时间" />
    <el-table-column label="操作" width="180px">
      <template #default="{ row }">
        <el-button v-if="isNotStartExam(row) && row.status == 0" type="text" @click="onEdit(row.examId)">编辑
        </el-button>
        <el-button v-if="isNotStartExam(row) && row.status == 0" type="text" @click="onDelete(row.examId)" class="red">删除
        </el-button>
        <el-button v-if="row.status == 1 && isNotStartExam(row)" type="text"
          @click="cancelPublishExam(row.examId)">撤销发布</el-button>
        <el-button v-if="row.status == 0 && isNotStartExam(row)" type="text"
          @click="publishExam(row.examId)">发布</el-button>
        <el-button type="text" v-if="!isNotStartExam(row)">已开赛，不允许操作</el-button>
      </template>
    </el-table-column>
  </el-table>
  <!-- 分页区域 -->
  <el-pagination background size="small" layout="total, sizes, prev, pager, next, jumper" :total="total"
    v-model:current-page="params.pageNum" v-model:page-size="params.pageSize" :page-sizes="[5, 10, 15, 20]"
    @size-change="handleSizeChange" @current-change="handleCurrentChange" />
</template>

<script setup>
import { Plus } from '@element-plus/icons-vue'
function isNotStartExam(exam) {
  const now = new Date(); //当前时间
  return new Date(exam.startTime) > now
}
</script>

<el-date-picker> 是日期时间范围选择器组件：

这是一个判断，如果已经开始则为已开赛，否则未开赛

根据status的值不同去展示是否发布

如果已经开赛并且没到开始时间可以撤销发布，否则已经开赛不允许修改

分页功能

查询重置功能

function onSearch() {
  params.pageNum = 1
  getExamList()
}

function onReset() {
  params.pageNum = 1
  params.pageSize = 10
  params.title = ''
  params.startTime = ''
  params.endTime = ''
  datetimeRange.value.length = 0
  getExamList()
}

因为时间范围是一个数组的形式，但是后端需要的是2个参数（开始时间和结束时间）所以我们需要单独赋值，而其他的因为双向绑定，所以不需要

async function getExamList() {
  if (datetimeRange.value[0] instanceof Date) {
    params.startTime = datetimeRange.value[0].toISOString()
  }
  if (datetimeRange.value[1] instanceof Date) {
    params.endTime = datetimeRange.value[1].toISOString()
  }
  const result = await getExamListService(params)
  examList.value = result.rows
  total.value = result.total
}

增加竞赛

一、不包含题目的竞赛

后端代码

Controller

@RestController
@RequestMapping("/exam")
public class ExamController extends BaseController {

    @Autowired
    private IExamService examService;
    //exam/list
    @GetMapping("/list")
    public TableDataInfo list(ExamQueryDTO examQueryDTO) {
        return getDataTable(examService.list(examQueryDTO));
    }
    @PostMapping("/add")
    public R<String> add(@RequestBody ExamAddDTO examAddDTO) {
        return R.ok(examService.add(examAddDTO));
    }
}

DTO

Service

首先我们需要判断竞赛标题是否重复，竞赛开始时间和结束时间判断

然后将DTO中内容复制给Exam类

原因：Exam类继承了BeanEntity类以及使用了雪花算法，可以提高id和创建时间和创建人

由于判断会被多次使用，所以我们将其提出为一个方法

 @Override
    public String add(ExamAddDTO examAddDTO) {
        checkExamSaveParams(examAddDTO, null);
        Exam exam = new Exam();
        BeanUtil.copyProperties(examAddDTO, exam);
        examMapper.insert(exam);
        return exam.getExamId().toString();
    }
    private void checkExamSaveParams(ExamAddDTO examSaveDTO, Long examId) {
        //1、竞赛标题是否重复进行判断   2、竞赛开始、结束时间进行判断

        List<Exam> examList = examMapper
                .selectList(new LambdaQueryWrapper<Exam>()
                        .eq(Exam::getTitle, examSaveDTO.getTitle())
                        .ne(examId != null, Exam::getExamId, examId));
        if (CollectionUtil.isNotEmpty(examList)) {
            throw new ServiceException(ResultCode.FAILED_ALREADY_EXISTS);
        }
        if (examSaveDTO.getStartTime().isBefore(LocalDateTime.now())) {
            throw new ServiceException(ResultCode.EXAM_START_TIME_BEFORE_CURRENT_TIME);  //竞赛开始时间不能早于当前时间
        }
        if (examSaveDTO.getStartTime().isAfter(examSaveDTO.getEndTime())) {
            throw new ServiceException(ResultCode.EXAM_START_TIME_AFTER_END_TIME);
        }
    }

最后返回竞赛ID,为后面的增加题目做准备

前端代码

模板代码

<template>
  <div class="add-exam-component-box">
    <div class="add-exam-component">
      <!-- 竞赛信息模块 -->
      <div class="exam-base-info-box">
        <!-- 标题 -->
        <div class="exam-base-title">
          <span class="base-title">{{ type === 'edit' ? '编辑竞赛' : '添加竞赛' }}</span>
          <span class="go-back" @click="goBack">返回</span>
        </div>
        <!-- 基本信息 -->
        <div class="exam-base-info">
          <div class="group-box">
            <div class="group-item">
              <div class="item-label required">竞赛名称</div>
              <div>
                <el-input v-model="formExam.title" style="width:420px" placeholder="请填写竞赛名称"></el-input>
              </div>
            </div>
          </div>
          <div class="group-box">
            <div class="group-item">
              <div class="item-label required">竞赛周期</div>
              <div>
                <el-date-picker v-model="formExam.examDate" :disabledDate="disabledDate" type="datetimerange"
                  start-placeholder="竞赛开始时间" end-placeholder="竞赛结束时间" value-format="YYYY-MM-DD HH:mm:ss" />
              </div>
            </div>
          </div>
          <div class="group-box">
            <div class="group-item">
              <el-button class="exam-base-info-button" type="primary" plain @click="saveBaseInfo">保存</el-button>
            </div>
          </div>
        </div>
      </div>
      <!-- 添加竞赛题目 -->
      <div class="exam-select-question-box">
        <el-button class="exam-add-question" :icon="Plus" type="text" @click="addQuestion()">
          添加题目
        </el-button>
        <el-table height="136px" :data="formExam.examQuestionList" class="question-select-list">
          <el-table-column prop="questionId" width="180px" label="题目id" />
          <el-table-column prop="title" :show-overflow-tooltip="true" label="题目标题" />
          <el-table-column prop="difficulty" width="80px" label="题目难度">
            <template #default="{ row }">
              <div v-if="row.difficulty === 1" style="color:#3EC8FF;">简单</div>
              <div v-if="row.difficulty === 2" style="color:#FE7909;">中等</div>
              <div v-if="row.difficulty === 3" style="color:#FD4C40;">困难</div>
            </template>
          </el-table-column>
          <el-table-column label="操作" width="80px">
            <template #default="{ row }">
              <el-button circle type="text" @click="deleteExamQuestion(formExam.examId, row.questionId)">
                删除
              </el-button>
            </template>
          </el-table-column>
        </el-table>
      </div>
      <!-- 题目配置模块 题目列表勾选加序号 -->
      <div>
        <el-dialog v-model="dialogVisible">
          <div class="exam-list-box">
            <div class="exam-list-title required">选择竞赛题目</div>
            <el-form inline="true">
              <el-form-item label="题目难度">
                <selector v-model="params.difficulty" style="width: 120px;"></selector>
              </el-form-item>
              <el-form-item label="题目名称">
                <el-input v-model="params.title" placeholder="请您输入要搜索的题目标题" />
              </el-form-item>
              <el-form-item>
                <el-button @click="onSearch" plain>搜索</el-button>
                <el-button @click="onReset" plain type="info">重置</el-button>
              </el-form-item>

            </el-form>
            <!-- 题目列表 -->
            <el-table :data="questionList" @select="handleRowSelect">
              <el-table-column type="selection"></el-table-column>
              <el-table-column prop="questionId" label="题目id" />
              <el-table-column prop="title" label="题目标题" />
              <el-table-column prop="difficulty" label="题目难度">
                <template #default="{ row }">
                  <div v-if="row.difficulty === 1" style="color:#3EC8FF;">简单</div>
                  <div v-if="row.difficulty === 2" style="color:#FE7909;">中等</div>
                  <div v-if="row.difficulty === 3" style="color:#FD4C40;">困难</div>
                </template>
              </el-table-column>
            </el-table>
            <!-- 分页区域 -->
            <div class="exam-question-list-button">
              <el-pagination background size="small" layout="total, sizes, prev, pager, next, jumper" :total="total"
                v-model:current-page="params.pageNum" v-model:page-size="params.pageSize"
                :page-sizes="[1, 5, 10, 15, 20]" @size-change="handleSizeChange"
                @current-change="handleCurrentChange" />
              <el-button class="question-select-submit" type="primary" plain
                @click="submitSelectQuestion">提交</el-button>
            </div>
          </div>
        </el-dialog>
      </div>

      <!-- 提交任务区域 -->
      <div class="submit-box absolute">
        <el-button type="info" plain @click="goBack">取消</el-button>
        <el-button type="primary" plain @click="publishExam">发布竞赛</el-button>
      </div>
    </div>
  </div>
</template>

<script setup>

import { examAddService } from "@/apis/exam"
import { getQuestionListService } from "@/apis/question"
import Selector from "@/components/QuestionSelector.vue"
import router from '@/router'
import { reactive, ref } from "vue"
import { Plus } from "@element-plus/icons-vue"
import { useRoute } from 'vue-router';
const type = useRoute().query.type
const formExam = reactive({
  examId: '',
  title: '',
  examDate: ''
})
// 返回
function goBack() {
  router.go(-1)
}
const params = reactive({
  pageNum: 1,
  pageSize: 10,
  difficulty: '',
  title: ''
})

</script>
<style lang="scss" scoped>
.add-exam-component-box {
  height: 100%;
  overflow: hidden;
  position: relative;
}

.exam-list-box {
  background: #fff;
  padding: 20px 24px;

  .question-select-submit {
    margin-left: 0;
    margin-top: 20px;
    width: 100%;
  }

  .exam-list-title {
    font-size: 14px;
    color: rgba(0, 0, 0, 0.85);
    position: relative;
    padding: 15px 20px;
    padding-top: 0;

    &.required::before {
      position: absolute;
      content: '*';
      font-size: 20px;
      color: red;
      left: 10px;
    }
  }
}

.add-exam-component {
  width: 100%;
  background: #fff;
  padding-bottom: 120px;
  overflow-y: auto;
  box-sizing: border-box;
  height: calc(100vh - 50px);
  margin-top: -10px;

  .exam-select-question-box {

    background: #fff;
    border-bottom: 1px solid #fff;
    border-radius: 2px;
    width: 100%;

    .exam-add-question {
      font-size: 14px;
      float: right;
      margin: 10px 20px 5px 0;
    }

    .question-select-list {
      margin: 0 0 20px 0;
      height: 200px;
    }
  }

  .exam-base-info-box {
    background: #fff;
    border-bottom: 1px solid #fff;
    border-radius: 2px;
    margin-bottom: 10px;
    width: 100%;
    box-sizing: border-box;

    .exam-base-title {
      width: 100%;
      box-sizing: border-box;
      height: 52px;
      border-bottom: 1px solid #e9e9e9;
      display: flex;
      justify-content: space-between;
      align-items: center;

      .base-title {
        font-size: 16px;
        font-weight: 500;
        color: #333333;
      }

      .go-back {
        color: #999;
        cursor: pointer;
      }
    }

    .exam-base-info {
      box-sizing: border-box;
      border-bottom: 1px solid #e9e9e9;
    }

    .mesage-list-content {
      box-shadow: 0px 0px 6px 0px rgba(0, 0, 0, 0.1);
      background-color: rgba(255, 255, 255, 1);
      border-radius: 10px;
      width: 1200px;
      margin-top: 20px;
    }
  }

  .group-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: calc(100% - 64px);
    margin: 24px 0;

    .group-item {
      display: flex;
      align-items: center;
      width: 100%;

      .exam-base-info-button {
        margin-left: 104px;
        width: 420px;
      }

      .item-label {
        font-size: 14px;
        font-weight: 400;
        width: 94px;
        text-align: left;
        color: rgba(0, 0, 0, 0.85);
        position: relative;
        padding-left: 10px;

        &.required::before {
          position: absolute;
          content: '*';
          font-size: 20px;
          color: red;
          left: 0px;
          top: -2px;
        }
      }
    }
  }

  .submit-box {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;

    &.absolute {
      position: absolute;
      width: calc(100% - 48px);
      bottom: 0;
      background: #fff;
      z-index: 999;
    }
  }
}
</style>

<style>
.w-e-text-container {
  min-height: 142px;
}
</style>

api请求

import service from '@/utils/request'

export function getExamListService(params) {
  return service({
    url: "/exam/list",
    method: "get",
    params,
  });
}

export function examAddService(params = {}) {
  return service({
    url: "/exam/add",
    method: "post",
    data: params,
  });
}

export function addExamQuestionService(params = {}) {
  return service({
    url: "/exam/question/add",
    method: "post",
    data: params,
  });
}

代码分析

基本信息

这里是我们之前学的输入框双向绑定，以及时间框

goBack()是点击想要事件，返回上一级路由

保存按键

async function saveBaseInfo() {
  const fd = new FormData()
  for (let key in formExam) {
    if (key === 'examDate') {
      fd.append('startTime', formExam.examDate[0]);
      fd.append('endTime', formExam.examDate[1]);
    } else {
      fd.append(key, formExam[key])
    }
  }
  await examAddService(fd)
  ElMessage.success('基本信息保存成功')
}

二、包含题目的竞赛

这里为什么要先保存后新增呢？

1.为了防止太多没有竞赛名字的题目集合存在，导致最后不知道到底是哪个

2.添加一个题目即可存在这个竞赛中，不用害怕突然退出导致的重新添加

后端代码

Controller

@RestController
@RequestMapping("/exam")
public class ExamController extends BaseController {

    @Autowired
    private IExamService examService;
    //exam/list
    @GetMapping("/list")
    public TableDataInfo list(ExamQueryDTO examQueryDTO) {
        return getDataTable(examService.list(examQueryDTO));
    }
    @PostMapping("/add")
    public R<String> add(@RequestBody ExamAddDTO examAddDTO) {
        return R.ok(examService.add(examAddDTO));
    }
}

Service

 @Override
    public boolean questionAdd(ExamQuestAddDTO examQuestAddDTO) {
        Exam exam = getExam(examQuestAddDTO.getExamId());
        checkExam(exam);
        Set<Long> questionIdSet = examQuestAddDTO.getQuestionIdSet();
        if (CollectionUtil.isEmpty(questionIdSet)) {
            return true;
        }
        List<Question> questionList = questionMapper.selectBatchIds(questionIdSet);
        if (CollectionUtil.isEmpty(questionList) || questionList.size() < questionIdSet.size()) {
            throw new ServiceException(ResultCode.EXAM_QUESTION_NOT_EXISTS);
        }
        return saveExamQuestion(exam, questionIdSet);
    }

DTO

@Getter
@Setter
public class ExamQuestAddDTO {

    private Long examId;

    private LinkedHashSet<Long> questionIdSet;
}

需要传入竞赛id和题目id集合

细节分析：

首先判断这个竞赛是否存在，如果存在则返回Exam,否则抛出异常资源不存在

 private Exam getExam(Long examId) {
        Exam exam = examMapper.selectById(examId);
        if (exam == null) {
            throw new ServiceException(ResultCode.FAILED_NOT_EXISTS);
        }
        return exam;
    }

检查一下竞赛是否开启，如果开启了则不能进行添加

获得问题列表，如果没有题目，则直接返回即可

通过问题ids进行批量查找，如果有找不到的题目，则直接抛出异常，资源不存在

这个方法是批量进行插入操作，将问题批量插入

这个方法是批量进行插入操tb_exam_questionxam_question中插入数据（竞赛id，题目id,题目顺序）----》》先将数据统一存在一个列表里面，然后一起插入，但是因为mybatis-plus中没有对应的批量插入方法，所以我们继承其他类提高的savaBatch方法

第一个参数是要操作是数据库，第二个参数是数据库里面参数的类型

前端代码

在点击添加题目后会弹出这样的一个弹框

我们仔细一看，可以去Element*中查找可得

就是将我们之前的题目列表在一个弹框中展示

下面实现添加点击事件

async function getQuestionList() {
    const result = await getQuestionListService(params)
    console.log(result)
    questionList.value = result.rows
    total.value = result.total
}

const dialogVisible = ref(false)
function addQuestion() {
    if (formExam.examId === null || formExam.examId === '') {
        ElMessage.error('请先保存竞赛基本信息')
    } else {
        getQuestionList()
        dialogVisible.value = true
    }
}

由于这里需要判断是否以及保存（examId）,所以我们保存的时候需要进行赋值

多选框

function handleRowSelect(selection) {
  questionIdSet.value = []
  selection.forEach(element => {
    questionIdSet.value.push(element.questionId)
  });
}

处理所选择的题目

提交

async function submitSelectQuestion() {
  if (questionIdSet.value && questionIdSet.value.length < 1) {
    ElMessage.error('请先选择要提交的题目')
    return false
  }
  const examQ = reactive({
    examId: formExam.examId,
    questionIdSet: questionIdSet.value
  })
  console.log(examQ)
  await addExamQuestionService(examQ);
  dialogVisible.value = false
  ElMessage.success('竞赛题目添加成功')
}

竞赛详情

后端代码

Controller

    @GetMapping("/detail")
    public R<ExamDetailVO> detail(Long examId) {
        return R.ok(examService.detail(examId));
    }

VO

我们这里需要竞赛标题，竞赛的开始时间和结束时间，以及问题列表（由于只需要问题id，难度，标题）所以使用QuestionVO

@Getter
@Setter
@JsonInclude(JsonInclude.Include.NON_NULL)
public class ExamDetailVO {

    private String title;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime startTime;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime endTime;

    private List<QuestionVO> examQuestionList;
}

@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
public class QuestionVO {
    @JsonSerialize(using = ToStringSerializer.class)
    private Long questionId;

    private String title;

    private Integer difficulty;

    private String createName;
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime createTime;
}

Service

我们首先通过examId来获得竞赛，然后将竞赛内容复制给返回值

然后通过竞赛id进行查询竞赛题目的题目id并根据order进行排序

之后通过题目id进行查询问题列表，将查询到的列表复制给questionVOList来进行返回值处理

最后把questionVOList赋值给examDetailVO

 @Override
    public ExamDetailVO detail(Long examId) {
        ExamDetailVO examDetailVO = new ExamDetailVO();
        Exam exam = getExam(examId);
        BeanUtil.copyProperties(exam, examDetailVO);
        List<ExamQuestion>examQuestionList = examQuestionMapper.selectList(new LambdaQueryWrapper<ExamQuestion>()
                .select(ExamQuestion::getQuestionId)
                .eq(ExamQuestion::getExamId,examId)
                .orderByAsc(ExamQuestion::getQuestionOrder)
        );
        if (CollectionUtil.isEmpty(examQuestionList)) {
            return examDetailVO;
        }
       List<Long> questionIdList= examQuestionList.stream().map(ExamQuestion::getQuestionId).toList();
        List<Question> questionList=questionMapper.selectList(new LambdaQueryWrapper<Question>()
                .select(Question::getQuestionId,Question::getTitle,Question::getDifficulty)
                .in(Question::getQuestionId,questionIdList)
        );
        List<QuestionVO> questionVOList=new ArrayList<>();
     questionVOList= BeanUtil.copyToList(questionList,QuestionVO.class);
        examDetailVO.setExamQuestionList(questionVOList);
        return examDetailVO;
    }

这里总的来说就是从一堆表里面通过关系去查询结果，然后将内容进行截断赋值给要返回的类型

前端代码

创建请求函数

点击编辑按钮的时候，会进行路由，为了携带examid以及type，我们在路由上面携带

进来之后，我们首先从路由上获得examId,然后对formExam的竞赛ID进行赋值（为了不要点击保存就可以使用）获得返回值，对formExam进行赋值

注意：由于后端是分为开始时间和结束时间，而前端只有一个examDate，所以我们这里特殊处理

async function getExamDetail() {
    const examId = useRoute().query.examId
    console.log(examId)
    if (examId) {
        formExam.examId = examId
        const examDetail =await getExamDetailService(examId)
        Object.assign(formExam, examDetail.data)
       formExam.examDate = [examDetail.data.startTime, examDetail.data.endTime]
    }
}

竞赛编辑

竞赛基本信息编辑

后端代码

Controller

DTO

Service

  @Override
    public int edit(ExamEditDTO examEditDTO) {
        Exam exam = getExam(examEditDTO.getExamId());
        checkExam(exam);
        checkExamSaveParams(examEditDTO, examEditDTO.getExamId());
        exam.setTitle(examEditDTO.getTitle());
        exam.setStartTime(examEditDTO.getStartTime());
        exam.setEndTime(examEditDTO.getEndTime());
        return examMapper.updateById(exam);
    }

相同竞赛id的时候可以同样的标题，但不同竞赛ID标题不能相同

前端代码

竞赛题目信息编辑

后端代码

题目删除功能

Controller

@DeleteMapping("/question/delete")
    public R<Void> questionDelete(Long examId, Long questionId) {
        return toR(examService.questionDelete(examId, questionId));
    }

Service

  @Override
    public int questionDelete(Long examId, Long questionId) {
        Exam exam = getExam(examId);
        checkExam(exam);
        if (Contants.TRUE.equals(exam.getStatus())) {
            throw new ServiceException(ResultCode.EXAM_IS_PUBLISH);
        }
        return examQuestionMapper.delete(new LambdaQueryWrapper<ExamQuestion>()
                .eq(ExamQuestion::getExamId, examId)
                .eq(ExamQuestion::getQuestionId, questionId));
    }

详细分析：

首先查看这个竞赛是否存在

因为在比赛开始后，我们不能进行删除题目操作，所以检查是否已经开始

判断是否已经开赛，如果已经开赛则不能修改（双重保险）

去删除tb_exam_question中竞赛id相同且题目Id相同的数据

前端代码

async function deleteExamQuestion(examId, questionId) {
    await delExamQuestionService(examId, questionId)
    getExamDetailById(examId)
    ElMessage.success('竞赛题目删除成功')
}

首先删除代码，然后重新展示

由于获取详情代码经常使用，所以提出

async function getExamDetailById(examId) {
    const examDetail = await getExamDetailService(examId)
    formExam.examQuestionList = []
    Object.assign(formExam, examDetail.data)
    formExam.examDate = [examDetail.data.startTime, examDetail.data.endTime]
}

注意：由于当我们删除最后一个题目的时候，我们会导致examQuestionList为空，导致赋值的时候无法找到，所以我们需要提前设置一下

修改之前获取详情代码

async function getExamDetail() {
    const examId = useRoute().query.examId
    console.log(examId)
    if (examId) {
        formExam.examId = examId
        getExamDetailById(examId)
    }
}

由于添加题目之后也需要重新请求详细信息，所以也修改代码

async function submitSelectQuestion() {
    if (questionIdSet.value && questionIdSet.value.length < 1) {
        ElMessage.error('请先选择要提交的题目')
        return false
    }
    const examQ = reactive({
        examId: formExam.examId,
        questionIdSet: questionIdSet.value
    })
    console.log(examQ)
    await addExamQuestionService(examQ);
    dialogVisible.value = false
    getExamDetailById(formExam.examId)

    ElMessage.success('竞赛题目添加成功')

}

我们现在发现，我们添加题目之后，我们点击添加题目之后还是会显示出来，这对用户不友好，所以我们继续修改后端代码和前端代码

已;作为分隔符

@Override
    public List<QuestionVO> list(QuestionQueryDTO questionQueryDTO) {
        String excludeIdStr = questionQueryDTO.getExcludeIdStr();
        if (StrUtil.isNotEmpty(excludeIdStr)) {
            String[] excludeIdArr = excludeIdStr.split(Contants.SPLIT_SEM);
            Set<Long> excludeIdSet = Arrays.stream(excludeIdArr)
                    .map(Long::valueOf)
                    .collect(Collectors.toSet());
            questionQueryDTO.setExcludeIdSet(excludeIdSet);
        }
        PageHelper.startPage(questionQueryDTO.getPageNum(),questionQueryDTO.getPageSize());
        return questionMapper.selectQuestionList(questionQueryDTO);
    }

得到前端的参数后，先将excludeIdStr按照分隔符进行分割为数组，然后将数组转为Set<Long>类型的数据，最后将参数赋值给DTO进行数据库查询

这里修改之前的xml文件

<?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.bite.system.mapper.question.QuestionMapper">

    <select id="selectQuestionList" resultType="com.bite.system.model.question.vo.QuestionVO">
        SELECT
            tq.question_id,
            tq.title,
            tq.difficulty,
            ts.nick_name as create_name,
            tq.create_time
        FROM
            tb_question tq
        left join
            tb_sys_user ts
        on
            tq.create_by = ts.user_id
        <where>
            <if test="difficulty !=null ">
                AND difficulty = #{difficulty}
            </if>
            <if test="title !=null and title !='' ">
                AND title LIKE CONCAT('%',#{title},'%')
            </if>
            <if test="excludeIdSet !=null and !excludeIdSet.isEmpty()">
                <foreach collection="excludeIdSet" open=" AND tq.question_id NOT IN( " close=" ) " item="id" separator=",">
                    #{id}
                </foreach>
            </if>
        </where>
        ORDER BY
        create_time DESC
    </select>
</mapper>

这样我们搜索的时候就可以排除我们集合中的questionid

然后修改前端代码

我们进行查询前先查找已经选择的题目id，然后进行查找

竞赛删除

后端代码

Controller

   @DeleteMapping("/delete")
    public R<Void> delete(Long examId) {
        return toR(examService.delete(examId));
    }

Service

我们这里只需要保证是在开始之前进行删除即可，调用数据库删除竞赛里面的问题，然后删除竞赛

  @Override
    public int delete(Long examId) {
        Exam exam = getExam(examId);
        if (Contants.TRUE.equals(exam.getStatus())) {
            throw new ServiceException(ResultCode.EXAM_IS_PUBLISH);
        }
        checkExam(exam);
        examQuestionMapper.delete(new LambdaQueryWrapper<ExamQuestion>()
                .eq(ExamQuestion::getExamId, examId));
        return examMapper.deleteById(exam);
    }

前端代码

async function onDelete(examId) {
  await delExamService(examId)
  params.pageNum = 1
  getExamList()
}

竞赛发布与撤销发布

后端代码

 @PutMapping("/publish")
    public R<Void> publish(Long examId) {
        return toR(examService.publish(examId));
    }
    @PutMapping("/cancelPublish")
    public R<Void> cancelPublish(Long examId) {
        return toR(examService.cancelPublish(examId));
    }

 @Override
    public int publish(Long examId) {
        Exam exam = getExam(examId);

        if (exam.getEndTime().isBefore(LocalDateTime.now())) {
            throw new ServiceException(ResultCode.EXAM_IS_FINISH);
        }
        //select count(0) from tb_exam_question where exam_id = #{examId}
        Long count = examQuestionMapper
                .selectCount(new LambdaQueryWrapper<ExamQuestion>()
                        .eq(ExamQuestion::getExamId, examId));
        if (count == null || count <= 0) {
            throw new ServiceException(ResultCode.EXAM_NOT_HAS_QUESTION);
        }
        exam.setStatus(Contants.TRUE);
        return examMapper.updateById(exam);
    }
    @Override
    public int cancelPublish(Long examId) {
        Exam exam = getExam(examId);
        checkExam(exam);
        if (exam.getEndTime().isBefore(LocalDateTime.now())) {
            throw new ServiceException(ResultCode.EXAM_IS_FINISH);
        }
        exam.setStatus(Contants.FALSE);
        return examMapper.updateById(exam);
    }

这里逻辑简单不做多余讲解

前端代码

Exam.vue

import{ publishExamService,cancelPublishExamService} from '../apis/exam'
async function publishExam(examId) {
  await publishExamService(examId)
  getExamList()
}

async function cancelPublishExam(examId) {
  await cancelPublishExamService(examId)
  getExamList()
}

update.vue

我们在新增竞赛的时候发现，当我们新增页面或者之前没有选择题目的竞赛的时候，我们点击新增题目会报错，这是因为examQuestionList为null

至此我们B端竞赛管理结束