Javascript 如何跨NodeJs应用程序和模块正确重用与Mongodb的连接
我一直在阅读，但仍然不知道在整个NodeJs应用程序中共享同一数据库（MongoDb）连接的最佳方式是什么。据我所知，当应用程序启动并在模块之间重用时，连接应该打开。我目前认为最好的方法是，Javascript 如何跨NodeJs应用程序和模块正确重用与Mongodb的连接,javascript,node.js,mongodb,express,Javascript,Node.js,Mongodb,Express,我一直在阅读，但仍然不知道在整个NodeJs应用程序中共享同一数据库（MongoDb）连接的最佳方式是什么。据我所知，当应用程序启动并在模块之间重用时，连接应该打开。我目前认为最好的方法是，server.js（一切开始的主文件）连接到数据库并创建传递给模块的对象变量。一旦连接，模块代码将根据需要使用此变量，并且此连接保持打开状态。例如： var MongoClient = require('mongodb').MongoClient; var mongo = {}; // thi
server.js var MongoClient = require('mongodb').MongoClient;
var mongo = {}; // this is passed to modules and code
MongoClient.connect("mongodb://localhost:27017/marankings", function(err, db) {
if (!err) {
console.log("We are connected");
// these tables will be passed to modules as part of mongo object
mongo.dbUsers = db.collection("users");
mongo.dbDisciplines = db.collection("disciplines");
console.log("aaa " + users.getAll()); // displays object and this can be used from inside modules
} else
console.log(err);
});
var users = new(require("./models/user"))(app, mongo);
console.log("bbb " + users.getAll()); // not connected at the very first time so displays undefined
models/userUsers = function(app, mongo) {
Users.prototype.addUser = function() {
console.log("add user");
}
Users.prototype.getAll = function() {
return "all users " + mongo.dbUsers;
}
}
module.exports = Users;
现在我有一种可怕的感觉，这是错误的，那么这种方法是否有任何明显的问题，如果有，如何使其更好？您可以创建一个
mongoUtil.jsconst MongoClient = require( 'mongodb' ).MongoClient;
const url = "mongodb://localhost:27017";
var _db;
module.exports = {
connectToServer: function( callback ) {
MongoClient.connect( url, { useNewUrlParser: true }, function( err, client ) {
_db = client.db('test_db');
return callback( err );
} );
},
getDb: function() {
return _db;
}
};
app.js中执行此操作：
var mongoUtil = require( 'mongoUtil' );
mongoUtil.connectToServer( function( err, client ) {
if (err) console.log(err);
// start the rest of your app here
} );
然后，当您需要访问其他地方的mongo时，如在另一个.js
文件中，您可以执行以下操作：
var mongoUtil = require( 'mongoUtil' );
var db = mongoUtil.getDb();
db.collection( 'users' ).find();
这样做的原因是，在节点中，当模块是require
'd时，它们只会加载/源代码一次，因此您将只得到\u db
的一个实例，mongoUtil.getDb（）
将始终返回相同的实例
注意，代码没有经过测试。go-oleg基本上是正确的，但是现在你（可能）不想使用“mongodb”本身，而是使用一些框架，这将为你做很多“肮脏的工作”
例如，猫鼬是最常见的动物之一。这是我们最初的server.js
文件中的内容：
const mongoose = require('mongoose');
const options = {server: {socketOptions: {keepAlive: 1}}};
mongoose.connect(config.db, options);
这就是设置它所需要的一切。现在在代码中的任何地方都可以使用它
const mongoose = require('mongoose');
您可以使用mongoose.connect设置该实例。如果您使用的是Express，则可以使用允许您在请求对象中获取db连接的模块
安装
npm install --save mongo-express-req
server.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
routes/users.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
注意：mongo-express-req
未维护express-mongo-db
根据go-oleg的示例，以下是我如何使用现代语法。我的是测试和功能
我在代码中添加了一些注释
./db/mongodb.js
/index.js
./users/index.js
基于公认答案的测试解决方案：
MongoButil.js：
var MongoClient = require( 'mongodb' ).MongoClient;
var _db;
module.exports = {
connectToServer: function( callback ) {
MongoClient.connect( "<connection string>", function( err, client ) {
_db = client.db("<database name>");
return callback( err );
} );
},
getDb: function() {
return _db;
}
};
activities.js--一条路线：
var express = require('express');
var router = express.Router();
var mongodbutil = require( '../mongodbutil' );
var db = mongodbutil.getDb();
router.get('/', (req, res, next) => {
db.collection('activities').find().toArray((err, results) => {
if (err) return console.log(err)
res.render('activities', {activities: results, title: "Activities"})
});
});
router.post('/', (req, res) => {
db.collection('activities').save(req.body, (err, result) => {
if (err) return console.log(err)
res.redirect('/activities')
})
});
module.exports = router;
将连接初始化为承诺：
const MongoClient = require('mongodb').MongoClient
const uri = 'mongodb://...'
const client = new MongoClient(uri)
const connection = client.connect() // initialized connection
然后在希望对数据库执行操作时调用连接：
// if I want to insert into the database...
const connect = connection
connect.then(() => {
const doc = { id: 3 }
const db = client.db('database_name')
const coll = db.collection('collection_name')
coll.insertOne(doc, (err, result) => {
if(err) throw err
})
})
我们可以创建一个dbconnection文件，比如dbconnection.js
const MongoClient = require('mongodb').MongoClient
const mongo_url = process.env.MONGO_URL;
module.exports = {
connect: async function(callback) {
var connection;
await new Promise((resolve, reject) => {
MongoClient.connect(mongo_url, {
useNewUrlParser: true
}, (err, database) => {
if (err)
reject();
else {
connection = database;
resolve();
}
});
});
return connection;
}
};
然后在应用程序中使用此文件，如
var connection = require('../dbconnection');
然后像这样在异步函数中使用
db = await connection.connect();
希望这能起作用有很多方法可以调整，以便在某些地方接受配置对象，但总体而言，它与您的代码布局类似，尽管使用了更现代的JS语法。可以很容易地重写为原型和回调，如果这是您的需求的话
mongo.js
const { MongoClient } = require('mongodb');
const config = require('./config');
const Users = require('./Users');
const conf = config.get('mongodb');
class MongoBot {
constructor() {
const url = `mongodb://${conf.hosts.join(',')}`;
this.client = new MongoClient(url, conf.opts);
}
async init() {
await this.client.connect();
console.log('connected');
this.db = this.client.db(conf.db);
this.Users = new Users(this.db);
}
}
module.exports = new MongoBot();
Users.js
class User {
constructor(db) {
this.collection = db.collection('users');
}
async addUser(user) {
const newUser = await this.collection.insertOne(user);
return newUser;
}
}
module.exports = User;
app.js
const mongo = require('./mongo');
async function start() {
// other app startup stuff...
await mongo.init();
// other app startup stuff...
}
start();
someFile.js
const { Users } = require('./mongo');
async function someFunction(userInfo) {
const user = await Users.addUser(userInfo);
return user;
}
如果您选择在应用程序中使用mongoose，请使用以下代码段编辑app.js文件
app.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
下一步：
例如，定义应用程序所需的模型并直接执行CRUD操作
blogSchema.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
用法
createBlog.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
你不需要总是连接到mogoDB…我做这个有点晚了，但我也会添加我的解决方案。与这里的答案相比，这是一个更加无趣的方法
var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017/';
var Pro1;
module.exports = {
DBConnection:async function()
{
Pro1 = new Promise(async function(resolve,reject){
MongoClient.connect(url, { useNewUrlParser: true },function(err, db) {
if (err) throw err;
resolve(db);
});
});
},
getDB:async function(Blockchain , Context)
{
bc = Blockchain;
contx = Context;
Pro1.then(function(_db)
{
var dbo = _db.db('dbname');
dbo.collection('collectionname').find().limit(1).skip(0).toArray(function(err,result) {
if (err) throw err;
console.log(result);
});
});
},
closeDB:async function()
{
Pro1.then(function(_db){
_db.close();
});
}
};
无论如何，如果您使用的是MongoDB 4.0版和Node.js 3.0版（或更高版本），您可以使用MongoClient
中的函数
const MongoClient = require('mongodb').MongoClient;
const uri = "<your connection url>";
const client = new MongoClient(uri, { useNewUrlParser: true });
if (client.isConnected()) {
execute();
} else {
client.connect().then(function () {
execute();
});
}
function execute() {
// Do anything here
// Ex: client.db("mydb").collection("mycol");
}
const MongoClient=require（'mongodb'）。MongoClient；
const uri=“”；
const client=newmongoclient（uri，{useNewUrlParser:true}）；
if（client.isConnected（））{
执行（）；
}否则{
client.connect（）.then（函数（）{
执行（）；
});
}
函数execute（）{
//在这里做什么
//例如：client.db（“mydb”）.collection（“mycl”）；
}
这对我很管用。希望有帮助。这是我在2020年的设置：
/utils/database.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
/app.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
我发现这很有效：）
mongoUtil.ts
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
anyFile.ts
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
app.get('/', function (req, res, next) {
req.db // => Db object
});
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
我参加聚会迟到了，但希望这个答案能对某人有所帮助，这是一个功能代码：
db.js
我们导出一个函数连接到mongo，另一个函数获取连接的反实例
app.js
我们必须在初始化连接后执行auth模块的要求，否则getDb函数将返回undefined
module.js
由于这是用Express标记的，我想我应该提到Express有一个内置功能，用于在路线之间共享数据。有一个名为app.locals的对象。我们可以将属性附加到它，并从路由内部访问它。您只需在app.js文件中实例化mongo连接
var-app=express（）；
MongoClient.connect（'mongodb://localhost:27017/')
。然后（客户端=>{
const db=client.db（'your-db'）；
const collection=db.collection（'your-collection'）；
app.locals.collection=集合；
});
//查看引擎设置
app.set（'views'，path.join（'views'）；