云函数

可以看做java或者php，作为后端服务

cloudfunctions/myCloud/index.js

exports.main = async (event, context) => {
  const { name, age } = event
    return `我是${name},今年${age}`
};

pages/index/index.vue

//callFunction方法 在前端和云端都可以调用另一个云函数
uniCloud.callFunction({
   name: "myCloud",
   data:{
   name:"小白",
   age:22
 }
}).then(res => {
  console.log(res)
})

浏览器

云函数通过传统方式操作数据库

查-cloudfunctions/cloudDome/index.js

const db = uniCloud.database();
exports.main = async (event, context) => {
  // 获取 `users` 集合的引用
  const collection = await db.collection('users').get()

  return collection
};

查-pages/index/index.vue

<template>
  <view class="content" v-for="item in user" :key="item._id">
    {{item.name}} -- {{item.gender}}
  </view>
</template>

<script>
import { reactive, toRefs } from "vue"
  export default {
    setup() {
      const data = reactive({
        user:{}
      })
      uniCloud.callFunction({
        name: "cloudDome",
        data:{}
      }).then(res => {
        data.user = res.result.data
      })
      return {
        ...toRefs(data)
      }
    }
  }
</script>

查-浏览器

---

doc，指定 id 的记录的引用

const db = uniCloud.database();
exports.main = async (event, context) => {
  const collection = await db.collection('users').doc("640aa8330c801c2ac9373731").get()
  return collection
};

limit

const db = uniCloud.database();
exports.main = async (event, context) => {
  const collection = await db.collection('users').limit(3).get()
  return collection
};

skip，与limit实现翻页效果，skip指跳过的数据

const db = uniCloud.database();
exports.main = async (event, context) => {
  const collection = await db.collection('users').limit(3).skip(3).get()
  return collection
};

orderBy

const db = uniCloud.database();
exports.main = async (event, context) => {
  const collection = await db.collection('users').orderBy("_id","desc").get()
  return collection
};

field，指定返回字段

const db = uniCloud.database();
exports.main = async (event, context) => {
  const collection = await db.collection('users').field({ 'name': true,'_id':false }).get()
  return collection
};

where与查询筛选指令 Query Command

const db = uniCloud.database();
const dbCmd = db.command
exports.main = async (event, context) => {
  const collection = await db.collection('users').where({
  //age:dbCmd.gt(20).and(dbCmd.lt(48)) 
  age:dbCmd.and(dbCmd.gt(8),dbCmd.lt(48))
  //age:dbCmd.or(dbCmd.and(dbCmd.gt(8),dbCmd.lt(48)),dbCmd.eq(50)) 
  }).get()
  return collection
};

正则表达式查询

const db = uniCloud.database();
const dbCmd = db.command
exports.main = async (event, context) => {
  const {  keyWord  } = event
  const collection = await db.collection('users').where({
    name: new RegExp(keyWord,'ig')  //i表示忽略大小写 g表示全局搜索
  }).get()
  return collection
};

---

增-cloudfunctions/cloudDome/index.js

const db = uniCloud.database();
exports.main = async (event, context) => {
  const obj = {
    "name": "小红",
    "gender": "未知",
    "tel": 1333333333,
    "mail": "564654654@qq.com"
  }
  const collection = await db.collection('users').add(obj)
  return collection
};

增-pages/index/index.vue

uniCloud.callFunction({
        name: "cloudDome",
        data:{}
}).then(res => {
        console.log(res)
})

增-数据库

改-cloudfunctions/cloudDome/index.js

const db = uniCloud.database()
exports.main = async (event, context) => {
  const {  keyWord  } = event
  const collection = await db.collection('users').doc("640aa8330c801c2ac9373731").update({
    name:'张三被改名了',
    age:0
  })
  return {
    message:'修改成功',
    collection
  }
};

改-数据库

批量改-cloudfunctions/cloudDome/index.js

const db = uniCloud.database()
const dbCmd = db.command
exports.main = async (event, context) => {
  const {  keyWord  } = event
  const collection = await db.collection('users').where({
    age:dbCmd.lt(20)
  }).update({
    text:'小于二十岁的小年轻'
  })
  return {
    message:'修改成功',
    collection
  }
};

批量改-数据库

---

push，向数组尾部追加元素

const db = uniCloud.database()
const dbCmd = db.command
exports.main = async (event, context) => {
  const {  keyWord  } = event
  const collection = await db.collection('users').doc("640aa867f43e603fbeb7771b").update({
    like:dbCmd.push(["烟花"])
  })
  return {
    message:'修改成功',
    collection
  }
};
//中间添加
const collection = await db.collection('users').doc("640aa867f43e603fbeb7771b").update({
    like: dbCmd.push({
      each: ["大","白"],
      position: 1
    })
})

inc，多用户的点赞

  const collection = await db.collection('users').doc("640aa867f43e603fbeb7771b").update({
    love:dbCmd.inc(1)
  })

---

删-cloudfunctions/cloudDome/index.js

const db = uniCloud.database()
exports.main = async (event, context) => {
  const collection = await db.collection('users').doc("640aae9ff43e603fbeb96150").remove()
  return {
    message: '修改成功',
    collection
  }
};

批量删-cloudfunctions/cloudDome/index.js

const db = uniCloud.database()
const dbCmd = db.command
exports.main = async (event, context) => {
  const collection = await db.collection('users').where({
    name:/小/ig
  }).remove()
  return {
    message: '修改成功',
    collection
  }
};