Node.js的Mongodb使用实例

使用生成器（Generator）的批量插入操作

var MongoClient = require('mongodb').MongoClient,
 test = require('assert'),
 co = require('co');
co(function*(){
 var db = yield MongoClient.connect('mongodb://localhost:27017/test');
 var blog = db.collection('blog');
 var r = yield blog.insertMany([{name:"xiaosBB"},{name:"fzqMM"}]);
 test.equal(2,r.insertedCount);
 db.close();
});

单个文档插入：insertOne(doc,options,callback)（如果没有callback函数，本身返回一个Promise对象）

简单的插入操作

var MongoClient = require('mongodb').MongoClient,
 test = require('assert');
MongoClient.connect('mongodb://localhost:27017/test',(err,db)=>{
 var blog = db.collection('blog');
 blog.insertOne({name:"xiaos"},(err,r) => {
  test.equal(null,err);
  test.equal(1,r.insertedCount);
  db.close();
 });
});

使用Promise的插入操作

var MongoClient = require('mongodb').MongoClient,
 test = require('assert');
MongoClient.connect('mongodb://localhost:27017/test',(err,db)=>{
 var blog = db.collection('blog');
 blog.insertOne({name:"xiaos"}).then((r)=>{
  test.equal(1,r.insertedCount);
  db.close();
 });
});

使用生成器的插入操作

var MongoClient = require('mongodb').MongoClient,
 test = require('assert'),
 co = require('co');
co(function*(){
 var db = yield MongoClient.connect('mongodb://localhost:27017/test');
 var blog = db.collection('blog');
 var r = yield blog.insertOne({name:"xiaosBB"});
 test.equal(1,r.insertedCount);
 db.close();
});

mapReduce(map,reduce,options,callback) return Promise if no callback

var MongoClient = require('mongodb').MongoClient,
 test = require('assert');
MongoClient.connect()

isCapped(callback) return Promise if no callback

var MongoClient = require('mongodb').MongoClient,
 test = require('assert');
MongoClient.connect('mongodb://localhost:27017/test',(err,db) => {
 db.createCollection('newBlog',{'capped':true,'size':1024},(err,collection) => {
  test.equal('newBlog',collection.collectionName);
  collection.isCapped((err,capped) => {
   test.equal(true,capped);
   db.close();
  });
 });
});

capped collection是指固定大小的集合，新元素插入后会覆盖掉旧的元素，保持整个集合的大小不变。

//在命令行中输入mongo
//创建一个1024大小的myCappedCollection集合								 
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