node.js调用mangodb的操作还是有点繁琐的，为了简化底层操作，关注具体业务，我特意吧MongoDB封装了一下，话不多说直接看代码
封装代码
let MongoClient = require('mongodb').MongoClient;
const url = "mongodb://127.0.0.1:27017/"
class Dbc {
constructor(dataName,colName)
{
this.dataName = dataName
this.colName = colName
}
//查询
find(obj)
{
let that=this
return new Promise((resolve,reject) =>
{
MongoClient.connect(url,{
useNewUrlParser:true},function (err,dbs) {
if (err)
{
reject(err)
}
else
{
let collection=dbs.db(that.dataName).collection(that.colName)
collection.find(obj).toArray(function (err,data) {
if (err)
reject(err)
else
resolve(data)
dbs.close()
})
}
})
})
}
//插入一个对象
insertOne(obj){
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.insertOne(obj,function(err, res) {
if (err) throw err;
console.log("文档插入成功:",res.result)
dbs.close();
})
})
}
//插入一个对象数组
insertMany(obj){
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.insertMany(obj,function(err, res) {
if (err) throw err;
console.log("插入的文档数量为: " + res.insertedCount)
dbs.close();
})
})
}
//插入一个数组对象
insertMany(obj){
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.insertMany(obj,function(err, res) {
if (err) throw err;
console.log("插入的文档数量为: " + res.insertedCount)
dbs.close();
})
})
}
//删除一个，删除第一个满足对象
deleteOne(setObj)
{
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.deleteOne(setObj,function(err) {
if (err) throw err;
console.log("文档删除成功" )
dbs.close();
})
})
}
//删除所有满足条件的对象
deleteMany(setObj)
{
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.deleteMany(setObj,function(err,obj) {
if (err) throw err;
console.log(obj.result.n + " 条文档被删除")
dbs.close();
})
})
}
//更新一条数据
updateOne(whereObj,setObj)
{
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.updateOne(whereObj,{
$set:setObj},function(err) {
if (err) throw err;
console.log("文档更新成功")
dbs.close();
})
})
}
//更新多条数据
updateMany(whereObj,setObj)
{
let that = this;
MongoClient.connect(url,function(err,dbs){
if (err) throw err;
let collection=dbs.db(that.dataName).collection(that.colName)
collection.updateMany(whereObj,{
$set:setObj},function(err,res) {
if (err) throw err;
console.log(res.result.nModified + " 条文档被更新")
dbs.close();
})
})
}
}
module.exports={
Dbc
}
调用代码
const {
Dbc} = require("./mongodbc")
const dbc = new Dbc("mydb","user")
//添加
var myobj = [
{
name: '菜鸟工具', url: 'https://c.runoob.com', type: 'cn'},
{
name: 'Google', url: 'https://www.google.com', type: 'en'},
{
name: 'Facebook', url: 'https://www.google.com', type: 'en'}
];
dbc.insertMany(myobj)
//删除type为en的数据
dbc.deleteMany({
type:"en"})
//修改
dbc.updateMany({
type:"en"},{
url:"这是被修改后的路径"})
//查询type为en的数据
dbc.find({
type:"en"}).then(data => {
console.log(data)
})