node.js操作MongoDB的代码案例分享

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var writeData = function(db, callback) {
 // 连接到集合
 var collection = db.collection('person');
 // 插入数据
 var data = [{'name':'20170906','age':'22'}];
 collection.insert(data, function(error, result) {
 if (error) {
 console.log('error:' + error);
 return;
 };

 callback(result);
 });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
 console.log('连接成功');
 writeData(db, function(result) {
 console.log(result);
 db.close();
 })
})

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var updateData = function(db, callback) {
 // 连接到集合
 var collection = db.collection('person');
 // 修改数据
 var where = {'name':'20170906'};
 var update = {$set:{'age':'33'}};
 collection.update(where, update, function(error, result) {
 if (error) {
 console.log('error:' + error);
 return;
 };

 callback(result);
 });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
 console.log('连接成功');
 updateData(db, function(result) {
 console.log(result);
 db.close();
 })
})

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var removeData = function(db, callback) {
 // 连接到集合
 var collection = db.collection('person');
 // 删除数据
 var where = {'age':'22'};
 collection.remove(where, function(error, result) {
 if (error) {
 console.log('error:' + error);
 return;
 };

 callback(result);
 });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
 console.log('连接成功');
 removeData(db, function(result) {
 console.log(result);
 db.close();
 })
})

var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/col';

var readData = function(db, callback) {
 // 连接到集合
 var collection = db.collection('person');
 // 查询数据
 var where = {'name':'20170906'};
 collection.find(where).toArray(function(error, result) {
 if (error) 
 {
 console.log('error:' + error);
 return;
 };

 callback(result);
 });
}

MongoClient.connect(DB_CONN_STR, function(error, db) {
 console.log('连接成功');
 readData(db, function(result) {
 console.log(result);
 db.close();
 })
})