spring-webmvc练习-日程管理-实现删除日程功能

本文介绍: 在Vue3中，await是一个关键字，用于等待一个Prom i s e 对象的完成或拒绝。Prom i s e是Jav aSc rip t中用于处理异步操作的对象，它代表了一个异步操作的最终完成（或失败）及其结果值的表示。await 关键字可以用于等待Promis e对象的完成，并返回Promis e对象的结果值

1、main.js

import { createApp } from 'vue'
import App from './App.vue'

import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'

import zhCn from 'element-plus/dist/locale/zh-cn.mjs'

let app = createApp(App);
app.use(ElementPlus, {
    locale: zhCn,
})
app.mount('#app')

2、util/request.js

import axios from "axios";

let request = axios.create({
    baseURL: "http://localhost:8080",
    timeout: 50000
});

export default request

3、api/s ched ule.js

import request from "../util/request.js";

export let getScheduleList = () =&gt; {
    return request.get('/schedule')
};
export let updateSchedule=data=&gt;{
    return request.put("/schedule",data)
}
export let saveSchedule=data=&gt;{
    return request.post("/schedule",data)
}
export let delSchedule=id=&gt;{
    return request.delete(`/schedule/${id}`)
}

4、App.vue

<template&gt;

  <el-container&gt;
    <el-row&gt;
      <el-button type="primary" plain @click="toAdd"&gt;新增</el-button>
    </el-row>
    <el-table :data="scheduleList" style="width: 100%">
      <el-table-column label="编号" width="180">
        <template #default="scope">
          <div style="display: flex; align-items: center">
            <span style="margin-left: 10px">{{ scope.row.id }}</span>
          </div>
        </template>
      </el-table-column>
      <el-table-column label="学习计划" width="180">
        <template #default="scope">
          <div style="display: flex; align-items: center">
            <span style="margin-left: 10px">{{ scope.row.title }}</span>
          </div>
        </template>
      </el-table-column>
      <el-table-column label="是否完成" width="180">
        <template #default="scope">
          <div style="display: flex; align-items: center">
            <span style="margin-left: 10px">{{ scope.row.completed ? '完成' : '未完成' }}</span>
          </div>
        </template>
      </el-table-column>
      <el-table-column label="其他操作">
        <template #default="scope">
          <el-button size="small" @click="handleEdit(scope.row)">Edit</el-button>
          <el-button size="small" type="danger" @click="handleDelete(scope.row.id)">Delete</el-button>
        </template>
      </el-table-column>
    </el-table>

    <el-dialog v-model="dialogFormVisible" title="Shipping address">
      <el-form :model="form">
        <el-form-item label="标题">
          <el-input v-model="form.title" autocomplete="off"/>
        </el-form-item>
        <el-form-item label="Zones">
          <el-radio-group v-model="form.completed">
            <el-radio :label="true">完成</el-radio>
            <el-radio :label="false">未完成</el-radio>
          </el-radio-group>
        </el-form-item>
      </el-form>
      <template #footer>
      <span class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确定</el-button>
      </span>
      </template>
    </el-dialog>
  </el-container>

</template>

<script lang="ts" setup>
import {delSchedule, getScheduleList, saveSchedule, updateSchedule} from './api/schedule.js';
import {onMounted, reactive, ref} from 'vue';
import {ElMessage, ElMessageBox} from "element-plus";

let dialogFormVisible = ref(false);

let form = reactive({
  id: 0,
  title: '',
  completed: false
})
let form0 = reactive({
  id: 0,
  title: '',
  completed: false
})
let resetFormData = () => {
  Object.assign(form, form0);
}

let scheduleList = reactive([])

let loadData = () => {
  scheduleList.length = 0;
  getScheduleList().then(response => {
    Object.assign(scheduleList, response.data.data)
  })
}

let saveOrUpdate = () => {
  if (form.id === 0) {
    save();
  } else {
    update();
  }
}

let save = async () => {
  await saveSchedule(form)
  dialogFormVisible.value = false
  resetFormData();
  loadData();
}

let toAdd = () => {
  resetFormData();
  dialogFormVisible.value = true;
}

onMounted(() => {
  loadData();
})

let update = async () => {
  await updateSchedule(form)
  dialogFormVisible.value = false
  loadData();
}

interface scheduleList {
  id: Number
  title: string
  completed: boolean
}

const handleEdit = row => {
  dialogFormVisible.value = true;
  Object.assign(form, row);
}
const handleDelete = id => {

  ElMessageBox.confirm(
      '是否确认删除?',
      '提示',
      {
        confirmButtonText: '是',
        cancelButtonText: '否',
        type: 'warning',
      }
  )
      .then(async () => {
        await delSchedule(id)
        dialogFormVisible.value = false
        loadData();
      })
      .catch(() => {
        ElMessage({
          type: 'info',
          message: '你取消了操作',
        })
      })
};
</script>

5、ScheduleController.java

package com.atguigu.schedule;
import com.atguigu.schedule.controller.Result;
import com.atguigu.schedule.pojo.Schedule;
import com.atguigu.schedule.service.ScheduleService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
@CrossOrigin
@RestController
@RequestMapping("/schedule")
public class ScheduleController {

    @Autowired
    private ScheduleService scheduleService;

    @GetMapping
    public Result list() {
        return Result.ok(scheduleService.getScheduleList());
    }

    @PostMapping
    public Result save(@RequestBody Schedule schedule) {
        scheduleService.add(schedule);
        return Result.ok();
    }

    @PutMapping
    public Result update(@RequestBody Schedule schedule) {
        scheduleService.update(schedule);
        return Result.ok();
    }

    @DeleteMapping("/{id}")
    public Result del(@PathVariable Integer id) {
        scheduleService.del(id);
        return Result.ok();
    }
}

6、await

在Vue3中，await是一个关键字，用于等待一个Promise对象的完成或拒绝。Promise是JavaScript中用于处理异步操作的对象，它代表了一个异步操作的最终完成（或失败）及其结果值的表示。await 关键字可以用于等待Promise对象的完成，并返回Promise对象的结果值。

在Vue3中，await通常用于等待异步请求的响应，例如使用 axi os库发送HTTP请求到后端API。通过使用await 关键字，可以确保在异步请求完成之前程序不会继续执行后面的代码，而会等待异步操作完成后再继续执行。这样可以避免出现竞态条件和数据不一致等问题，并确保数据的正确性和一致性。

下面是一个使用await 等待Promise对象完成的示例：
async function fetchData() {  
  try {  
    const response = await axios.get('https://api.example.com/data');  
    const data = response.data;  
    // 处理数据  
    return data;  
  } catch (error) {  
    // 处理错误  
  }  
}
在这个示例中，使用 async 关键字定义了一个异步函数 fetchData()，它使用axios库发送一个GET请求到指定的URL，并使用await关键字等待响应完成。如果响应成功完成，程序会返回响应数据，并可以在需要时使用这些数据进行渲染。如果请求失败，程序会捕获错误并处理。