小试小程序云开发(小结)

client #前端目录
├── config #配置
├── dist #输出
├── src #源目录
└── index.html #入口文件
cloud #云目录
├── dao #数据库操作函数集合
├── login #登录云函数
└── ... #其他

import Taro, { Component, Config } from "@tarojs/taro";
import { View, Text, Navigator } from "@tarojs/components";
import "./index.scss";

interface IState {
 loading: boolean;
 size: number;
 page: number;
 total: number;
 list: Array<{ _id: string; summary: object }>;
 context:object;
}
export default class Index extends Component<{}, IState> {
 state = {
  loading: false,
  size: 10,
  page: 0,
  total: -1,
  list: [],
  context:{}
 };
 config: Config = {
  navigationBarTitleText: "Jeff's Blog",
  onReachBottomDistance: 50
 };

 componentWillMount() {
  this.getList();
  this.getLogin();
 }

 getDbFn(fn, param) {
  return Taro.cloud.callFunction({
   name: "dao",
   data: { fn, param }
  });
 }

 onReachBottom() {
  this.getList();
 }
 
 getList() {
  const { size, page, total, loading } = this.state;
  if (loading) return;
  Taro.showLoading({ title: 'loading', });
  if (total >= 0 && size * page >= total) return;
  this.setState({ loading: true });
  this.getDbFn("getList", { size, page: page + 1 }).then(res => {
   Taro.hideLoading();
   const total = res.result.total;
   const list = this.state.list.concat(res.result.list);
   this.setState({ loading: false, page: page + 1, total, list });
  }).catch(err => {
   Taro.hideLoading();
   this.setState({ loading: false });
  });
 }

 onShareAppMessage (res) {
  return {
   title: "Jeff's Blog",
   path: '/pages/index/index'
  }
 }
 
 render() {
  return (
   <View className='container'>
    {this.state.list.map(l => (
     <View className='item' key={l._id}>
      <Navigator url={'/pages/post/post?id=' + l._id}>
       <Image className='banner' mode='widthFix' src={l.summary.banner} />
       <View className='title'>{l.summary.title}</View>
      </Navigator>
      <View className='sub-title'>
       {l.summary.tags.map(t => (
        <Navigator className='tag' url={'/pages/list/list?tag=' + t}> {t} </Navigator>
       ))}
       <Text className='time'>{l.summary.date}</Text>
      </View>
     </View>
    ))}
   </View>
  );
 }
}

getLogin(){
  Taro.cloud.callFunction({
   name: "login",
   data: {}
  }).then(res => {
   this.setState({ context: res.result });
  }).catch(err=>{
  });
}

//数据库引用
const db = wx.cloud.database()
//获取数据集合
const todos = db.collection('todos')

//获取记录数
todos.count();
//条件查找
todos.where({done: false,progress: 50}).get()

//插入
todos.add({data: {content:'11',time:new Date()}},success:(res){});

//更新
todos.doc('todo').update({ data: { done: true}},success:(res){});

//删除
todos.where({done:true}).remove();

//分页查找
todos.orderBy('time','desc')
  .skip(start)
  .limit(size)
  .get();

// 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) => {
  const { fn, param } = event;
  return dao[fn](param);
};
// 调用数据库
const db = cloud.database();
// 表
const posts = db.collection("posts");
const tags = db.collection("tags");
const dao = {
  async getList({ page = 1, size = 10 }) {
    const start = (page - 1) * size;
    try {
      const { total } = await posts.count();
      const { data } = await posts
        .field({ summary: true })
        .orderBy('num','desc')
        .skip(start)
        .limit(size)
        .get();
      return {
        code: 0,
        list: data,
        total,
        message: "sucess"
      };
    } catch (err) {
      return {
        code: -1,
        list: [],
        total: -1,
        err: err,
        message: "error"
      };
    }
  },
  getPost({ id }) {
    return posts.doc(id).get();
  },
  async getTagList({ tag }) {
    try{
      const { data } = await tags.where({ name: tag }).get();
      if(!data.length){ 
        return {
          code:0,
          list:[],
          message: "success"
        };
      } 
      const list = data[0].list.sort((a,b) => b.num - a.num);
      return {
        code:0,
        list:list,
        message: "success"
      };
    } catch(err){
      return {
        code: -1,
        list:[],
        err: err,
        message: "error"
      };
    }
  }
}

exports.main = async (event, context) => {
  const { fn, param } = event;
  return dao[fn](param);
};

 getDbFn(fn, param) {
  return Taro.cloud.callFunction({
   name: "dao",
   data: { fn, param }
  });
 }