C:\Program Files\MongoDB\Server\4.0\data\ MongoDB zhu
#Mongodb-Translate Translate MongoDB api for Node.js. Original source：https://www.npmjs.com/package/mongodb
Description: The official MongoDB driver for Node.js. Provides a high-level API on top of mongodb-core that is meant for end users. 官方MongoDB驱动程序, Node.js, 为最终用户提供一个mongodb core的高级api.
NOTE: v3.x was recently released with breaking API changes. You can find a list of changes. 最近发布的v3.x的API变化可以在下面的链接找到
###MongoDB Node.JS Driver
documentation: https://mongodb.github.io/node-mongodb-native api-doc: https://mongodb.github.io/node-mongodb-native/3.1/api source: https://github.com/mongodb/node-mongodb-native mongodb: https://www.mongodb.org
发现Bug, 报到这里： https://jira.mongodb.org/secure/Dashboard.jspa
Change Log： https://github.com/mongodb/node-mongodb-native/blob/HEAD/HISTORY.md
Installation： The recommended way to get started using the Node.js 3.0 driver is by using the npm (Node Package Manager) to install the dependency in your project. 建议使用Node.js npm来安装mongoDB的依赖。
npm install mongodb --save This will download the MongoDB driver and add a dependency entry in your package.json file.下载安装并添加依赖到package.json
##Connect to MongoDB Create a new app.js file and add the following code to try out some basic CRUD operations using the MongoDB driver.
Add code to connect to the server and the database myproject:
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
// Connection URL
const url = 'mongodb:https://localhost:27017';
// Database Name
const dbName = 'myproject';
// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected successfully to server");
const db = client.db(dbName);
client.close();
});Run your app from the command line with:
node app.jsInsert a Document
const insertDocuments = function(db, callback) {
// Get the documents collection
const collection = db.collection('documents');
// Insert some documents
collection.insertMany([
{a : 1}, {a : 2}, {a : 3}
], function(err, result) {
assert.equal(err, null);
assert.equal(3, result.result.n);
assert.equal(3, result.ops.length);
console.log("Inserted 3 documents into the collection");
callback(result);
});
}The insert command returns an object with the following fields: +result Contains the result document from MongoDB +ops Contains the documents inserted with added _id fields +connection Contains the connection used to perform the insert
Add the following code to call the insertDocuments function:
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
// Connection URL
const url = 'mongodb:https://localhost:27017';
// Database Name
const dbName = 'myproject';
// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected successfully to server");
const db = client.db(dbName);
insertDocuments(db, function() {
client.close();
});
});Find All Documents
const findDocuments = function(db, callback) {
// Get the documents collection
const collection = db.collection('documents');
// Find some documents
collection.find({}).toArray(function(err, docs) {
assert.equal(err, null);
console.log("Found the following records");
console.log(docs)
callback(docs);
});
}This query returns all the documents in the documents collection. Add the findDocument method to the MongoClient.connect callback:
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
// Connection URL
const url = 'mongodb:https://localhost:27017';
// Database Name
const dbName = 'myproject';
// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected correctly to server");
const db = client.db(dbName);
insertDocuments(db, function() {
findDocuments(db, function() {
client.close();
});
});
});Find Documents with a Query Filter
const findDocuments = function(db, callback) {
// Get the documents collection
const collection = db.collection('documents');
// Find some documents
collection.find({'a': 3}).toArray(function(err, docs) {
assert.equal(err, null);
console.log("Found the following records");
console.log(docs);
callback(docs);
});
}Update a document
const updateDocument = function(db, callback) {
// Get the documents collection
const collection = db.collection('documents');
// Update document where a is 2, set b equal to 1
collection.updateOne({ a : 2 }
, { $set: { b : 1 } }, function(err, result) {
assert.equal(err, null);
assert.equal(1, result.result.n);
console.log("Updated the document with the field a equal to 2");
callback(result);
});
}The method updates the first document where the field a is equal to 2 by adding a new field b to the document set to 1. Next, update the callback function from MongoClient.connect to include the update method.
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
// Connection URL
const url = 'mongodb:https://localhost:27017';
// Database Name
const dbName = 'myproject';
// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected successfully to server");
const db = client.db(dbName);
insertDocuments(db, function() {
updateDocument(db, function() {
client.close();
});
});
});Remove a document
const removeDocument = function(db, callback) {
// Get the documents collection
const collection = db.collection('documents');
// Delete document where a is 3
collection.deleteOne({ a : 3 }, function(err, result) {
assert.equal(err, null);
assert.equal(1, result.result.n);
console.log("Removed the document with the field a equal to 3");
callback(result);
});
}Add the new method to the MongoClient.connect callback function.
const MongoClient = require('mongodb').MongoClient;
const assert = require('assert');
// Connection URL
const url = 'mongodb:https://localhost:27017';
// Database Name
const dbName = 'myproject';
// Use connect method to connect to the server
MongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected successfully to server");
const db = client.db(dbName);
insertDocuments(db, function() {
updateDocument(db, function() {
removeDocument(db, function() {
client.close();
});
});
});
});