怎么在Node.js中操作MongoDB数据库？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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Node.js操作MongoDB
npm init
npm i mongodb --save
{
"name": "test",
"version": "1.0.0",
"description": "",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
"mongodb": "^3.1.1"
}
}连接数据库
// connect.js
const MongoClient = require('mongodb').MongoClient;
// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'mydatabase';
// Use connect method to connect to the server
MongoClient.connect(url, { useNewUrlParser: true }, function(err, client) {
console.log("Connected successfully to server");
const db = client.db(dbName);
client.close();
});插入
// insert.js
const MongoClient = require('mongodb').MongoClient;
// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'mydatabase';
// 插入
var insertData = function (db, callback) {
// 获取文档集合
var collection = db.collection('collection3');
var data = [{"name": "李二狗001", "age": 20}, {"name": "李二狗002", "age": 21}];
// 插入文档
collection.insert(data, function (err, result) {
if(err) {
console.log('Error: ' + err);
return;
}
callback(result);
})
}
// Use connect method to connect to the server
MongoClient.connect(url, { useNewUrlParser: true }, function(err, client) {
console.log("Connected successfully to server");
const db = client.db(dbName);
insertData(db, function (result) {
console.log(result);
client.close();
});
});查询
// find.js
const MongoClient = require('mongodb').MongoClient;
// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'mydatabase';
// 查询
var findData = function (db, callback) {
// 获取文档集合
var collection = db.collection('collection3');
var whereStr = {"name": "李二狗001"};
// 查询文档
collection.find(whereStr).toArray(function (err, result) {
if(err) {
console.log('Error: ' + err);
return;
}
callback(result);
})
}
// Use connect method to connect to the server
MongoClient.connect(url, { useNewUrlParser: true }, function(err, client) {
console.log("Connected successfully to server");
const db = client.db(dbName);
findData(db, function (result) {
console.log(result);
client.close();
})
});修改
// update.js
const MongoClient = require('mongodb').MongoClient;
// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'mydatabase';
// 修改
var updateData = function (db, callback) {
// 获取文档集合
var collection = db.collection('collection3');
var whereStr = {"name": "李二狗002"};
var updateStr = {$set: {"age": 100}};
// 修改文档
collection.update(whereStr, updateStr, function (err, result) {
if(err) {
console.log('Error: ' + err);
return;
}
callback(result);
})
}
// Use connect method to connect to the server
MongoClient.connect(url, { useNewUrlParser: true }, function(err, client) {
console.log("Connected successfully to server");
const db = client.db(dbName);
updateData(db, function (result) {
console.log(result);
client.close();
})
});删除
// delete.js
const MongoClient = require('mongodb').MongoClient;
// Connection URL
const url = 'mongodb://localhost:27017';
// Database Name
const dbName = 'mydatabase';
// 删除
var delData = function (db, callback) {
// 获取文档集合
var collection = db.collection('collection3');
var whereStr = {"name": "李二狗002"};
// 删除文档
collection.remove(whereStr, function (err, result) {
if(err) {
console.log('Error: ' + err);
return;
}
callback(result);
})
}
// Use connect method to connect to the server
MongoClient.connect(url, { useNewUrlParser: true }, function(err, client) {
console.log("Connected successfully to server");
const db = client.db(dbName);
delData(db, function (result) {
console.log(result);
client.close();
})
});看完上述内容，你们掌握怎么在Node.js中操作MongoDB数据库的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
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