//mongodb_demo.js

/**
cnpm install mongodb
 */

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://test:123456@127.0.0.1:27017/test'; // 数据库为 test

var insertData = function (db, callback) {
    //连接到表 site
    var collection = db.collection('site');
    //插入数据
    var data = [{ "name": "网站1", "url": "www.test1.com" }, { "name": "网站2", "url": "www.test2.com" }];
    collection.insert(data, function (err, result) {
        if (err) {
            console.log('Error:' + err);
            return;
        }
        callback(result);
    });
}
var selectData = function (db, callback) {
    //连接到表  
    var collection = db.collection('site');
    //查询数据
    var whereStr = { "name": '网站1' };
    collection.find(whereStr).toArray(function (err, result) {
        if (err) {
            console.log('Error:' + err);
            return;
        }
        callback(result);
    });
}
var updateData = function (db, callback) {
    //连接到表  
    var collection = db.collection('site');
    //更新数据
    var whereStr = { "name": '网站1' };
    var updateStr = { $set: { "url": "https://www.test1.com" } };
    collection.update(whereStr, updateStr, function (err, result) {
        if (err) {
            console.log('Error:' + err);
            return;
        }
        callback(result);
    });
}
var delData = function (db, callback) {
    //连接到表  
    var collection = db.collection('site');
    //删除数据
    var whereStr = { "name": '网站1' };
    collection.remove(whereStr, function (err, result) {
        if (err) {
            console.log('Error:' + err);
            return;
        }
        callback(result);
    });
}

MongoClient.connect(DB_CONN_STR, function (err, db) {
    if (err) {
        console.log(err);
        return;
    }
    console.log("连接成功！");
    //1、插入
    insertData(db, function (result) {
        console.log(result);
        db.close();
    });
    //2、查询数据
    selectData(db, function (result) {
        console.log(result);
        db.close();
    });
    //3、更新数据
    updateData(db, function (result) {
        console.log(result);
        db.close();
    });
    //4、删除数据
    delData(db, function (result) {
        console.log(result);
        db.close();
    });

});

运行：node mongodb_demo.js