瑞吉外卖项目学习笔记:P16-套餐信息分页查询功能开发

P16-套餐信息分页查询功能开发

  • 1.需求分析
  • 2.代码开发
    • 2.1前后端交互流程
    • 2.2前端代码
      • 2.2.1 页面代码list.html
      • 2.2.2js代码
    • 2.3后端代码开发SetmealController

1.需求分析

系统中的套餐数据很多的时候,如果在一个页面中全部展示出来会显得比较乱,不便于查看,所以一般的系统中都会以分页的方式来展示列表数据。
瑞吉外卖项目学习笔记:P16-套餐信息分页查询功能开发_第1张图片

2.代码开发

2.1前后端交互流程

  1. 页面(backend/ page/combo/ list.html)发送ajax请求,将分页查询参数(page、pageSize 、name)提交到服务端,获取分页数据
    瑞吉外卖项目学习笔记:P16-套餐信息分页查询功能开发_第2张图片瑞吉外卖项目学习笔记:P16-套餐信息分页查询功能开发_第3张图片瑞吉外卖项目学习笔记:P16-套餐信息分页查询功能开发_第4张图片

  2. 页面发送请求,请求服务端进行图片下载,用于页面图片展示

开发套餐信息分页查询功能,其实就是在服务端编写代码去处理前端页面发送的这2次请求即可。

2.2前端代码

2.2.1 页面代码list.html

DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Documenttitle>
  
  <link rel="stylesheet" href="../../plugins/element-ui/index.css" />
  <link rel="stylesheet" href="../../styles/common.css" />
  <link rel="stylesheet" href="../../styles/page.css" />
head>
<body>
   <div class="dashboard-container" id="combo-app">
    <div class="container">
      <div class="tableBar">
        <el-input
          v-model="input"
          placeholder="请输入套餐名称"
          style="width: 250px"
          clearable
          @keyup.enter.native="handleQuery"
        >
          <i
            slot="prefix"
            class="el-input__icon el-icon-search"
            style="cursor: pointer"
            @click="init"
          >i>
        el-input>
        <div class="tableLab">
          <span class="span-btn delBut non" @click="deleteHandle('批量')">批量删除span>
          <span class="span-btn blueBug non" @click="statusHandle('1')">批量启售span>
          <span
            style="border:none;"
            class="span-btn delBut non"
            @click="statusHandle('0')"
          >批量停售span>
          <el-button
            type="primary"
            @click="addSetMeal('add')"
          >
            + 新建套餐
          el-button>
        div>
      div>
      <el-table
        :data="tableData"
        stripe
        class="tableBox"
        @selection-change="handleSelectionChange"
      >
        <el-table-column
          type="selection"
          width="25"
        >el-table-column>
        <el-table-column
          prop="name"
          label="套餐名称"
        >el-table-column>
        <el-table-column prop="image" label="图片"  align="center">
          <template slot-scope="{ row }">
            <el-image style="width: auto; height: 40px; border:none;cursor: pointer;" :src="getImage(row.image)" :preview-src-list="[ `/common/download?name=${row.image}` ]" >
              <div slot="error" class="image-slot">
                <img src="./../../images/noImg.png"  style="width: auto; height: 40px; border:none;" >
              div> 
            el-image>
          template>
        el-table-column>
        <el-table-column
          prop="categoryName"
          label="套餐分类"
        >el-table-column>
        <el-table-column
          prop="price"
          label="套餐价"
        >
          <template slot-scope="scope">
            <span>¥{{ scope.row.price/100 }}span>
          template>
        el-table-column>
        <el-table-column label="售卖状态">
          <template slot-scope="scope">
            <span>{{ scope.row.status == '0' ? '停售' : '启售' }}span>
          template>
        el-table-column>
        <el-table-column
          prop="updateTime"
          label="最后操作时间"
        >
        el-table-column>
        <el-table-column
          label="操作"
          width="160"
          align="center"
        >
          <template slot-scope="scope">
            <el-button
              type="text"
              size="small"
              class="blueBug"
              @click="addSetMeal(scope.row.id)"
            >
              修改
            el-button>
            <el-button
              type="text"
              size="small"
              class="blueBug"
              @click="statusHandle(scope.row)"
            >
              {{ scope.row.status == '0' ? '启售' : '停售' }}
            el-button>
            <el-button
              type="text"
              size="small"
              class="delBut non"
              @click="deleteHandle('单删', scope.row.id)"
            >
              删除
            el-button>
          template>
        el-table-column>
      el-table>
      <el-pagination
        class="pageList"
        :page-sizes="[10, 20, 30, 40]"
        :page-size="pageSize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="counts"
        @size-change="handleSizeChange"
        :current-page.sync="page"
        @current-change="handleCurrentChange"
      >el-pagination>
    div>
  div>
    
    <script src="../../plugins/vue/vue.js">script>
    
    <script src="../../plugins/element-ui/index.js">script>
    
    <script src="../../plugins/axios/axios.min.js">script>
    <script src="../../js/request.js">script>
    <script src="../../api/combo.js">script>
    <script>
      new Vue({
        el: '#combo-app',
        data() {
          return {
             input: '',
             counts: 0,
             page: 1,
             pageSize: 10,
             tableData : [],
             dishState : '',
             checkList: []
          }
        },
        computed: {},
        created() {
          this.init()
        },
        mounted() {
        },
        methods: {
          async init () {
            const params = {
              page: this.page,
              pageSize: this.pageSize,
              name: this.input ? this.input : undefined
            }
            await getSetmealPage(params).then(res => {
              if (String(res.code) === '1') {
                this.tableData = res.data.records || []
                this.counts = res.data.total
              }
            }).catch(err => {
              this.$message.error('请求出错了:' + err)
            })
          },
          getImage (image) {
            return `/common/download?name=${image}`
          },
          handleQuery() {
            this.page = 1;
            this.init();
          },
          // 添加
          addSetMeal (st) {
            if (st === 'add'){
              window.parent.menuHandle({
                id: '5',
                url: '/backend/page/combo/add.html',
                name: '添加套餐'
              },true)
            } else {
              window.parent.menuHandle({
                id: '5',
                url: '/backend/page/combo/add.html?id='+st,
                name: '修改套餐'
              },true)
            }
          },

          // 删除
          deleteHandle (type, id) {
            if (type === '批量' && id === null) {
              if (this.checkList.length === 0) {
                return this.$message.error('请选择删除对象')
              }
            }
            this.$confirm('确定删除该套餐, 是否继续?', '确定删除', {
              'confirmButtonText': '确定',
              'cancelButtonText': '取消',
            }).then(() => {
              deleteSetmeal(type === '批量' ? this.checkList.join(',') : id).then(res => {
                if (res.code === 1) {
                  this.$message.success('删除成功!')
                  this.handleQuery()
                } else {
                  this.$message.error(res.msg || '操作失败')
                }
              }).catch(err => {
                this.$message.error('请求出错了:' + err)
              })
            })
          },

          //状态更改
          statusHandle (row) {
            let params = {}
            if (typeof row === 'string' ){
              if (this.checkList.length == 0){
                this.$message.error('批量操作,请先勾选操作菜品!')
                return false
              }
              params.ids = this.checkList.join(',')
              params.status = row
            } else {
              params.ids = row.id
              params.status = row.status ? '0' : '1'
            }
            this.$confirm('确认更改该套餐状态?', '提示', {
              'confirmButtonText': '确定',
              'cancelButtonText': '取消',
              'type': 'warning'
            }).then(() => {
              // 起售停售---批量起售停售接口
              setmealStatusByStatus(params).then(res => {
                if (res.code === 1) {
                  this.$message.success('套餐状态已经更改成功!')
                  this.handleQuery()
                } else {
                  this.$message.error(res.msg || '操作失败')
                }
              }).catch(err => {
                  this.$message.error('请求出错了:' + err)
              })
            })
          },

          // 全部操作
          handleSelectionChange (val){
            let checkArr = []
            val.forEach((n) => {
              checkArr.push(n.id)
            })
            this.checkList = checkArr
          },
          handleSizeChange (val) {
            this.pageSize = val
            this.init()
          },
          handleCurrentChange (val) {
            this.page = val
            this.init()
          }
        }
      })
    script>
body>
html>

2.2.2js代码

// 查询列表数据
const getSetmealPage = (params) => {
  return $axios({
    url: '/setmeal/page',
    method: 'get',
    params
  })
}

2.3后端代码开发SetmealController

/**
     * 套餐分页查询
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name){
        log.info("page={},pageSize={},name={}",page,pageSize,name);
        //构造分页条件构造器 page,pageSize
        Page<Setmeal> pageInfo=new Page(page,pageSize);
        Page<SetmealDto>setmealDtoPage =new Page<>();


        LambdaQueryWrapper<Setmeal>queryWrapper=new LambdaQueryWrapper<>();
        //添加查询条件,根据name
        queryWrapper.like(name!=null,Setmeal::getName,name);
        //添加查询条件
        queryWrapper.orderByDesc(Setmeal::getUpdateTime);
        //执行查询
        setmealService.page(pageInfo,queryWrapper);

        //对象拷贝pageInfo——》setmealDtoPage ,给setmealDtoPage 的categoryName赋值
        BeanUtils.copyProperties(pageInfo,setmealDtoPage,"records");
        List<Setmeal> records = pageInfo.getRecords();
        List<SetmealDto>setmealDtoList= records.stream().map((item)->{
            SetmealDto setmealDto = new SetmealDto();
            //对象拷贝
            BeanUtils.copyProperties(item,setmealDto);
            //分类id
            Long categoryId = item.getCategoryId();
            //根据分类id,查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category!=null){
                String categoryName = category.getName();
                setmealDto.setCategoryName(categoryName);
            }
            return setmealDto;

        }).collect(Collectors.toList());
        setmealDtoPage.setRecords(setmealDtoList);
        return R.success(setmealDtoPage);
    }

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