看此篇文章前如若你不了解也不会简单运用mongodb请戳这里
1.安装mongodb依赖,这里我们安装v2.2.33版本,如果之前有遇到过db.collection is not function 其实只是mongodb库版本的问题(桌面建立fml文件)
我的项目文件名为fml
C:\Users\admin\Desktop\fml> npm install [email protected]
2.插入数据
在fml中新建node-mongodb.js,并复制黏贴下面代码
var MongoClient = require('mongodb').MongoClient;
// 连接数据库 字符串形式
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var insertData = function(db, callback) {
//连接到表 fmlsite
var collect = db.collection('fmenglsite');
//插入数据
var data = [{"author":"风慕李","url":"http://www.jianshu.com/u/96432503edfd","description":"good good study"}];
collect.insert(data, function(err, result) {
if(err){
console.log('Error:'+ err);
return;
}
callback(result);
});
}
MongoClient.connect(DB_CONNECT_STR, function(err, db) {
console.log("connect server success!");
insertData(db, function(result) {
console.log(result);
db.close();
});
});
如若你也是vscode的使用者,快捷键Ctrl+`执行node node-mongodb.js
C:\Users\admin\Desktop\fml> node node-mongodb.js
connect server success!
{ result: { ok: 1, n: 1 },
ops:
[ { author: '风慕李',
url: 'http://www.jianshu.com/u/96432503edfd',
description:'good good study',
_id: 5a28ffd2241ba235a4d51535 } ],
insertedCount: 1,
insertedIds: [ 5a28ffd2241ba235a4d51535 ] }
你也可以通过mongodb客户端使用show dbs等语法查看(忘记了就戳这里)
3.查询数据
var MongoClient = require('mongodb').MongoClient;
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var searchData = function(db, callback) {
//连接到表
var collection = db.collection('fengmlsite');
//查询数据
var dataStr = {"description":'good good study'};
collection.find(dataStr).toArray(function(err, result) {
if(err){
console.log('Error:'+ err);
return;
}
callback(result);
});
}
MongoClient.connect(DB_CONNECT_STR, function(err, db) {
console.log("connect server success");
searchData(db, function(result) {
console.log(result);
db.close();
});
});
结果打印(如果返回为[],或许你需要等待一会,或者)
C:\Users\admin\Desktop\fml> node node-search.js
connect server success
[ { _id: 5a2907838e6f0939908741a9,
author: '风慕李',
url: 'http://www.jianshu.com/u/96432503edfd',
description: 'good good study' } ]
4.更新数据
var MongoClient = require('mongodb').MongoClient;
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var updateData = function(db, callback) {
//连接到表
var collection = db.collection('fengmlsite');
//更新数据
var dataStr = {"author":'风慕李'};
var updateStr = {$set: { "description" : "day day up" }};
collection.update(dataStr,updateStr, function(err, result) {
if(err){
console.log('Error:'+ err);
console.log(0)
return;
}
callback(result);
});
}
MongoClient.connect(DB_CONNECT_STR, function(err, db) {
console.log("connect server success");
updateData(db, function(result) {
console.log(result);
db.close();
});
});
终端输入
C:\Users\admin\Desktop\fml> node node-update.js
我们重新运行node-search.js会发现结果为空,我们在将node-search.js的查询条件datastr改为 {"author":'风慕李'}。你会看到如下结果:
C:\Users\admin\Desktop\fml> node node-search.js
connect server success
[ { _id: 5a2907838e6f0939908741a9,
author: '风慕李',
url: 'http://www.jianshu.com/u/96432503edfd',
description: 'day day up' } ]
这时你会看到description字段已经被更新了
5.删除数据
var MongoClient = require('mongodb').MongoClient;
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var delData = function(db, callback) {
//连接到表
var collection = db.collection('fengmlsite');
//删除数据
var dataStr = {"author":'风慕李'};
collection.remove(dataStr, function(err, result) {
if(err){
console.log('Error:'+ err);
return;
}
callback(result);
});
}
MongoClient.connect(DB_CONNECT_STR, function(err, db) {
console.log("connect server success!");
delData(db, function(result) {
console.log(result);
db.close();
});
});
终端输入
C:\Users\admin\Desktop\fml> node node-delete.js
我们重新运行node-search.js会发现结果为空,说明删除成功了
注:开始前记得运行mongodb服务(手动运行mongod.exe和mongo.exe或者用命令)
PS:如此一来,前端就可以愉快的操作数据库了,对于前端的我们来说开心不言而喻。
原文地址 https://gitee.com/wangFengJ/node/tree/master/node-mongodb