Vue+koa2开发一款全栈小程序(7.图书录入功能）

1.图书录入功能

1.获取图书信息

1.在mydemo/src/until.js中封装工具函数post和get

// 工具函数

import config from './config'

// http get工具函数 获取数据

export function get (url,data) {
  return request(url,'GET',data)
}

export function post (url,data) {
  return request(url,'POST',data)
}

function request(url,method,data){
  return new Promise((resolve, reject) => {
    wx.request({
      data,
      method,
      url: config.host + url,

      success: function (res) {
        if (res.data.code === 0) {
          resolve(res.data.data)
        } else {
          reject(res.data)
        }
      }
    })
  })
}

export function showSuccess (text) {
  wx.showToast({
    title: text,
    icon: 'success'
  })
}

2.在mydemo/src/pages/me/index.vue加入代码，实现扫码获取图书isdn，然后将图书的isdn通过post发送到server端的功能

    async addBook(isbn){ //因为要发送网络请求，所以用async

      const res=await post('/weapp/addbook',{
        isbn,
        openid:this.user.openId
      })
      if(res.code==0&&res.data.title){
        showSuccess('添加成功',`${res.data.title}添加成功`)
      }
    },

    scanBook () {
      wx.scanCode({
        success: (res) => {
          if(res.result){
            this.addBook(res.result)
          }
        }
      })
    }

index.vue

<template>
    <div class="container">

        <div class="userinfo">
          <img :src="avatarUrl" alt="">
          <button v-if="!user" open-type="getUserInfo" lang="zh_CN" @getuserinfo="doLogin">点击登录</button>
          <p>{{user.nickName}}</p>
        </div>
        <YearProgress></YearProgress>
        <button @click="scanBook" class="btn">添加图书</button>
    </div>
</template>
<script>
import qcloud from 'wafer2-client-sdk'
import config from '@/config.js'

import { showSuccess,post } from '@/until.js'

import YearProgress from '@/components/YearProgress'

export default {
  components: {
    YearProgress
  },
  data () {
    return {
      user: '',
      avatarUrl: '../../../static/img/unlogin.png'
    }
  },
  methods: {
    doLogin: function (e) {
      qcloud.setLoginUrl(config.loginUrl)
      var _this = this// 在success回调里面 this.user指向的已经不是data里的user了
      qcloud.login({
        success: function (userInfo) {
          console.log('登录成功', userInfo)

          showSuccess('登陆成功')// 显示登录成功提示图标
          wx.setStorageSync('userinfo', userInfo)
          _this.user = wx.getStorageSync('userinfo')
          _this.avatarUrl = _this.user.avatarUrl
        },
        fail: function (err) {
          console.log('登录失败', err)
        }
      })
    },

    async addBook(isbn){ //因为要发送网络请求，所以用async

      const res=await post('/weapp/addbook',{
        isbn,
        openid:this.user.openId
      })
      if(res.code==0&&res.data.title){
        showSuccess('添加成功',`${res.data.title}添加成功`)
      }
    },

    scanBook () {
      wx.scanCode({
        success: (res) => {
          if(res.result){
            this.addBook(res.result)
          }
        }
      })
    }

  },
  created () {
    this.user = wx.getStorageSync('userinfo')
    if (this.user) {
      this.avatarUrl = this.user.avatarUrl
      this.nickName = this.user.nickName
    }
    console.log(321, this.user)
  }

}
</script>
<style lang='scss'>
    .container{
      padding: 0 30rpx;
      .userinfo{
        margin-top: 100rpx;
        text-align: center;
        img{
          width: 150rpx;
          height: 150rpx;
          margin: 20rpx;
          border-radius: 50%;
        }

      }
    }
</style>

index.vue

3.在server/routes/index.js中加入路由

router.post('/addbook', controllers.addbook)

4.在server/controllers目录下新建addbook.js

const https=require('https')
// 新增图书
// 1.获取豆瓣信息
// https://api.douban.com/v2/book/isbn/9787115353528
// 2.入库

module.exports=async(ctx)=>{
    const {isbn,openid}=ctx.request.body
    console.log('添加图书',isbn,openid)
    if(isbn&&openid){
        let url='https://api.douban.com/v2/book/isbn/'+isbn
        const bookinfo=await getJSON(url)
        const rate=bookinfo.rating.average
        const {title,image,alt,publisher,summary,price}=bookinfo
        const tags=bookinfo.tags.map(v=>{
            return `${v.title}${v.count}`
        }).join(',')
        const author=bookinfo.author.join(',')
        console.log({rate,title,image,alt,publisher,summary,price,tags,author})
    }else{
        console.log('没收到参数')
    }
}

function getJSON(url){
    return new Promise((resolve,reject)=>{
        https.get(url,res=>{
            let urlData=''
            res.on('data',data=>{
                urlData+=data
            })
            res.on('end',data=>{
                const bookinfo=JSON.parse(urlData)
                if(bookinfo.title){
                    resolve(bookinfo)
                }
                reject(bookinfo)
            })
        })
    })
}

运行mydemo和server，打开微信开发者工具，点击添加图书按钮，在电脑中找一个图书的条形码进行扫描，然后在server的cmd界面，即可看到获取到了图书的信息

2.入库

1.新建数据表

1.进入mysql控制台，使用cauth数据库

show databases;
use cauth;

2.新建books表

DROP TABLE IF EXISTS `books`;

 CREATE TABLE `books` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `isbn` varchar(20) NOT NULL,
  `openid` varchar(100) NOT NULL,
  `title` varchar(100) NOT NULL,
  `image` varchar(100) NOT NULL,
  `alt` varchar(100) NOT NULL,
  `publisher` varchar(100) NOT NULL,
  `summary` varchar(1000) NOT NULL,
  `price` varchar(100) DEFAULT NULL,
  `rate` float DEFAULT NULL,
  `tags` varchar(100) DEFAULT NULL,
  `author` varchar(100) DEFAULT NULL,
  `count` int(11) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=20 DEFAULT CHARSET=utf8;

3.查看是否建立成功

show tables;
desc books;

2.将获取到的数据，存入books表

在addbook.js中相关代码

        try{
            await mysql('books').insert({
                isbn,openid,rate,title,image,alt,publisher,summary,price,tags,author
            })
            ctx.state.data={
                title,
                msg:'success'
            }
        }catch(e){
            ctx.state={
                code:-1,
                data:{
                    msg:'新增失败：'+e.sqlMessage
                }
            }
        }

addbooks.js

const https=require('https')
const {mysql}=require('../qcloud')

// 新增图书
// 1.获取豆瓣信息
// https://api.douban.com/v2/book/isbn/9787115353528
// 2.入库

module.exports=async(ctx)=>{
    const {isbn,openid}=ctx.request.body
    console.log('添加图书',isbn,openid)
    if(isbn&&openid){

        const findRes=await mysql('books').select().where('isbn',isbn)
        if(findRes.length){
            ctx.state={
                code:-1,
                data:{
                    mgs:'图书已存在'
                }
            }
            return
        }

        let url='https://api.douban.com/v2/book/isbn/'+isbn
        const bookinfo=await getJSON(url)
        const rate=bookinfo.rating.average
        const {title,image,alt,publisher,summary,price}=bookinfo
        const tags=bookinfo.tags.map(v=>{
            return `${v.title}${v.count}`
        }).join(',')
        const author=bookinfo.author.join(',')

        try{
            await mysql('books').insert({
                isbn,openid,rate,title,image,alt,publisher,summary,price,tags,author
            })
            ctx.state.data={
                title,
                msg:'success'
            }
        }catch(e){
            ctx.state={
                code:-1,
                data:{
                    msg:'新增失败：'+e.sqlMessage
                }
            }
        }

    }
}

function getJSON(url){
    return new Promise((resolve,reject)=>{
        https.get(url,res=>{
            let urlData=''
            res.on('data',data=>{
                urlData+=data
            })
            res.on('end',data=>{
                const bookinfo=JSON.parse(urlData)
                if(bookinfo.title){
                    resolve(bookinfo)
                }
                reject(bookinfo)
            })
        })
    })
}

3.在src/until.js中写添加成功的模态框代码

    async addBook(isbn){ //因为要发送网络请求，所以用async

      const res=await post('/weapp/addbook',{
        isbn,
        openid:this.user.openId
      })
      console.log(111,res)
      if(res.code===0){
        showModal('添加成功',`${res.data.title}添加成功`)
      }else{
        showModal('添加失败',`${res.data.mgs}`)
      }
    },

until.js

// 工具函数

import config from './config'

// http get工具函数 获取数据

export function get (url,data) {
  return request(url,'GET',data)
}

export function post (url,data) {
  return request(url,'POST',data)
}

function request(url,method,data){
  return new Promise((resolve) => {
    wx.request({
      data,
      method,
      url: config.host + url,

      success: function (res) {
        if (res.data.code === 0) {
          resolve(res.data)
        } else {

          resolve(res.data)
        }
      }
    })
  })
}

export function showSuccess (text) {
  wx.showToast({
    title: text,
    icon: 'success'
  })
}

export function showModal(title,content){
  wx.showModal({
    title,
    content,
    showCancel:false
  })
}

4.src/pages/me/index.vue中的关键代码

    async addBook(isbn){ //因为要发送网络请求，所以用async

      const res=await post('/weapp/addbook',{
        isbn,
        openid:this.user.openId
      })
      console.log(111,res)
      if(res.code===0){
        showModal('添加成功',`${res.data.title}添加成功`)
      }else{
        showModal('添加失败',`${res.data.mgs}`)
      }
    },

index.vue

<template>
    <div class="container">

        <div class="userinfo">
          <img :src="avatarUrl" alt="">
          <button v-if="!user" open-type="getUserInfo" lang="zh_CN" @getuserinfo="doLogin">点击登录</button>
          <p>{{user.nickName}}</p>
        </div>
        <YearProgress></YearProgress>
        <button @click="scanBook" class="btn">添加图书</button>
    </div>
</template>
<script>
import qcloud from 'wafer2-client-sdk'
import config from '@/config.js'

import { showSuccess,post,showModal } from '@/until.js'

import YearProgress from '@/components/YearProgress'

export default {
  components: {
    YearProgress
  },
  data () {
    return {
      user: '',
      avatarUrl: '../../../static/img/unlogin.png'
    }
  },
  methods: {
    doLogin: function (e) {
      qcloud.setLoginUrl(config.loginUrl)
      var _this = this// 在success回调里面 this.user指向的已经不是data里的user了
      qcloud.login({
        success: function (userInfo) {
          console.log('登录成功', userInfo)

          showSuccess('登陆成功')// 显示登录成功提示图标
          wx.setStorageSync('userinfo', userInfo)
          _this.user = wx.getStorageSync('userinfo')
          _this.avatarUrl = _this.user.avatarUrl
        },
        fail: function (err) {
          console.log('登录失败', err)
        }
      })
    },

    async addBook(isbn){ //因为要发送网络请求，所以用async

      const res=await post('/weapp/addbook',{
        isbn,
        openid:this.user.openId
      })
      console.log(111,res)
      if(res.code===0){
        showModal('添加成功',`${res.data.title}添加成功`)
      }else{
        showModal('添加失败',`${res.data.mgs}`)
      }
    },

    scanBook () {
      wx.scanCode({
        success: (res) => {
          if(res.result){
            this.addBook(res.result)
          }
        }
      })
    }

  },
  created () {
    this.user = wx.getStorageSync('userinfo')
    if (this.user) {
      this.avatarUrl = this.user.avatarUrl
      this.nickName = this.user.nickName
    }
    console.log(321, this.user)
  }

}
</script>
<style lang='scss'>
    .container{
      padding: 0 30rpx;
      .userinfo{
        margin-top: 100rpx;
        text-align: center;
        img{
          width: 150rpx;
          height: 150rpx;
          margin: 20rpx;
          border-radius: 50%;
        }

      }
    }
</style>