nodejs连接mongodb数据库实现增删改查

1.通过npm命令安装mongodb

2.安装mongodb数据库

CRUD操作

在此之前应对MongoDB数据库有所了解，知道它的一些增删查改命令。

1.增加

var MongoClient = require("mongodb").MongoClient;
var DB_URL = "mongodb://localhost:27017/chm";
 
function insertData(db)
{
 var devices = db.collection('vip');
 var data = {"name":"node","age":22,"addr":"nb","addTime":new Date()};
 devices.insert(data,function(error, result){
 if(error)
 {
 console.log('Error:'+ error);
 }else{
 
 console.log(result.result.n);
 }
 db.close();
 });
}
 
 
MongoClient.connect(DB_URL, function(error, db){
 console.log('连接成功!');
 insertData(db);
});

2.查找

var mongodb = require('mongodb')
var MongoClient = require('mongodb').MongoClient;
var DB_CONN_STR = 'mongodb://localhost:27017/chm'; 
 
var selectData = function(db, callback) { 
 //连接到表 
 var collection = db.collection('vip');
 //查询数据
 var whereStr = {"name":'node'};
 collection.find(whereStr,function(error, cursor){
 cursor.each(function(error,doc){
 if(doc){
 //console.log(doc);
 if (doc.addTime) {
 console.log("addTime: "+doc.addTime);
 }
 }
 });
 
 });
 
}
 
MongoClient.connect(DB_CONN_STR, function(err, db) {
 console.log("连接成功！");
 selectData(db, function(result) {
 console.log(result);
 db.close();
 });
});

3.更新

var MongoClient = require("mongodb").MongoClient;
var DB_URL = "mongodb://localhost:27017/chm";
 
MongoClient.connect(DB_URL, function(error, db){
 console.log("连接成功!");
 updateData(db);
});
 
function updateData(db)
{
 var devices = db.collection('vip');
 var whereData = {"name":"node"}
 var updateDat = {$set: {"age":26}}; //如果不用$set，替换整条数据
 devices.update(whereData, updateDat, function(error, result){
 if (error) {
 console.log('Error:'+ error);
 }else{
 console.log(result);
 }
 db.close();
 });
}

4.删除

var MongoClient = require('mongodb').MongoClient;
var DB_URL = "mongodb://localhost:27017/chm";
 
MongoClient.connect(DB_URL, function(error, db){
 console.log("连接成功");
 deleteData(db);
});
 
function deleteData(db)
{
 var devices = db.collection('vip');
 var data = {"name":"node"};
 devices.remove(data, function(error, result){
 if (error) {
 console.log('Error:'+ error);
 }else{
 console.log(result.result.n);
 }
 db.close();
 })
}

存储过程

在mongodb中创建存储过程

所有存储过程都存放在db.system.js中，通过db.eval(“存储过程ID()”);调用存储过程。

在代码中调用：

var MongoClient = require("mongodb").MongoClient;
var DB_URL = "mongodb://localhost:27017/chm";
 
MongoClient.connect(DB_URL, function(error,db){
 console.log("连接成功!");
 callProcess(db)
});
 
function callProcess(db)
{
 db.eval("get_vip_count()",function(error, result){
 if (error) {
 console.log(error);
 }else{
 console.log("count:"+result);
 }
 db.close();
 });
}