WeChat Mini Program Series Cloud Development

Three cores

• Cloud database
  • Provides the ability to directly add, delete, modify and query the database on the mini program side
  • The database is a document storage database similar to MongoDB and is very convenient to operate.
• cloud storage
  • You can directly upload, download, and delete files on the mini program.
  • Comes with CDN to improve file access speed
  • Temporary links can be obtained to support access outside the mini program.
• Cloud function
  • Provides the ability to execute code on the server
  • Contains WeChat’s natural private authentication
  • Greater authority to operate databases, etc.
  • Perform operations such as cloud calls and HTTP requests

Simple encapsulation of database operations

export const db = wx.cloud.database();

class NBCollection {
    
    
  constructor(collectionName) {
    
    
    this.collection = db.collection(collectionName);
  }

  // 增删改查
  add(data) {
    
    
    return this.collection.add({
    
    
      data,
    });
  }

  remove(condition, isDoc = true) {
    
    
    if (isDoc) {
    
    
      return this.collection.doc(condition).remove();
    } else {
    
    
      this.collection.where(condition).remove();
    }
  }

  update(condition, data, isDoc = true) {
    
    
    if (isDoc) {
    
    
      return this.collection.doc(condition).update({
    
     data });
    } else {
    
    
      return this.collection.where(condition).update({
    
     data });
    }
  }

  query(offset = 0, size = 20, condition = {
     
     }, isDoc = false) {
    
    
    if (isDoc) {
    
    
      return this.collection.doc(condition).get();
    } else {
    
    
      return this.collection.where(condition).skip(offset).limit(size).get();
    }
  }
}

// 导出
export const favorCollection = new NBCollection("nb_favor");
export const likeCollection = new NBCollection("nb_like");

Cloud function example

// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()

// 云函数入口函数
exports.main = async (event, context) => {
    
    
  // 1.获取数据库和集合
  const db = cloud.database()
  const type = event.type

  const collection = db.collection("lol")

  // 2.从集合中查询数据
  const res = await collection.get()
  return {
    
    
    name: "英雄联盟",
    liveRooms: res.data
  }
}

// 云函数入口文件
const cloud = require("wx-server-sdk");

cloud.init();

// 云函数入口函数
exports.main = async (event, context) => {
    
    
  // 1.生成小程序码
  const qrCodeRes = await cloud.openapi.wxacode.createQRCode({
    
    
    width: 320,
    path: "pages/cloud-database/index",
  });

  // 2.获取到数据, 并且上传到云存储中
  const wxContext = cloud.getWXContext();
  const timestamp = new Date().getTime();
  const openid = wxContext.OPENID;
  const extension = qrCodeRes.contentType.split("/").pop();
  const cloudPath = `${
      
      timestamp}_${
      
      openid}.${
      
      extension}`;

  const uploadRes = await cloud.uploadFile({
    
    
    fileContent: qrCodeRes.buffer,
    cloudPath,
  });

  return uploadRes;
};

// 云函数入口文件
const cloud = require('wx-server-sdk')
const axios = require("axios")

cloud.init()

// 云函数入口函数
exports.main = async (event, context) => {
    
    
  // 1.从自己的服务器请求数据
  const res = await axios.get("http://123.207.32.32:8000/home/multidata")

  // 2.对数据进行转换, 返回给客户端
  return {
    
    
    recommends: res.data.data.recommend.list,
    banners: res.data.data.banner.list
  }
}