看此篇文章前如若你不了解也不會簡單運用mongodb請戳這里
1.安裝mongodb依賴，這里我們安裝v2.2.33版本，如果之前有遇到過db.collection is not function 其實只是mongodb庫版本的問題(桌面建立fml文件)
我的項目文件名為fml
C:\Users\admin\Desktop\fml> npm install mongodb@2.2.33
2.插入數(shù)據(jù)
在fml中新建node-mongodb.js,并復制黏貼下面代碼
var MongoClient = require('mongodb').MongoClient;
// 連接數(shù)據(jù)庫 字符串形式
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var insertData = function(db, callback) {
//連接到表 fmlsite
var collect = db.collection('fmenglsite');
//插入數(shù)據(jù)
var data = [{"author":"風慕李","url":"http://www.lxweimin.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，快捷鍵Ctrl+`執(zhí)行node node-mongodb.js
C:\Users\admin\Desktop\fml> node node-mongodb.js
connect server success！
{ result: { ok: 1, n: 1 },
ops:
[ { author: '風慕李',
url: 'http://www.lxweimin.com/u/96432503edfd',
description:'good good study',
_id: 5a28ffd2241ba235a4d51535 } ],
insertedCount: 1,
insertedIds: [ 5a28ffd2241ba235a4d51535 ] }
你也可以通過mongodb客戶端使用show dbs等語法查看（忘記了就戳這里）
3.查詢數(shù)據(jù)
var MongoClient = require('mongodb').MongoClient;
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var searchData = function(db, callback) {
//連接到表
var collection = db.collection('fengmlsite');
//查詢數(shù)據(jù)
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();
});
});
結(jié)果打印（如果返回為[]，或許你需要等待一會，或者)
C:\Users\admin\Desktop\fml> node node-search.js
connect server success
[ { _id: 5a2907838e6f0939908741a9,
author: '風慕李',
url: 'http://www.lxweimin.com/u/96432503edfd',
description: 'good good study' } ]
4.更新數(shù)據(jù)
var MongoClient = require('mongodb').MongoClient;
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var updateData = function(db, callback) {
//連接到表
var collection = db.collection('fengmlsite');
//更新數(shù)據(jù)
var dataStr = {"author":'風慕李'};
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();
});
});
終端輸入
C:\Users\admin\Desktop\fml> node node-update.js
我們重新運行node-search.js會發(fā)現(xiàn)結(jié)果為空，我們在將node-search.js的查詢條件datastr改為 {"author":'風慕李'}。你會看到如下結(jié)果：
C:\Users\admin\Desktop\fml> node node-search.js
connect server success
[ { _id: 5a2907838e6f0939908741a9,
author: '風慕李',
url: 'http://www.lxweimin.com/u/96432503edfd',
description: 'day day up' } ]
這時你會看到description字段已經(jīng)被更新了
5.刪除數(shù)據(jù)
var MongoClient = require('mongodb').MongoClient;
var DB_CONNECT_STR = 'mongodb://localhost:27017/fengml';
var delData = function(db, callback) {
//連接到表
var collection = db.collection('fengmlsite');
//刪除數(shù)據(jù)
var dataStr = {"author":'風慕李'};
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();
});
});
終端輸入
C:\Users\admin\Desktop\fml> node node-delete.js
我們重新運行node-search.js會發(fā)現(xiàn)結(jié)果為空,說明刪除成功了
注：開始前記得運行mongodb服務（手動運行mongod.exe和mongo.exe或者用命令）
PS：如此一來，前端就可以愉快的操作數(shù)據(jù)庫了，對于前端的我們來說開心不言而喻。
原文地址 https://gitee.com/wangFengJ/node/tree/master/node-mongodb
