function mongodbModel(dbname,dataform) {
  var MongoClient;
  var DB_CONN_STR;
  this.init = function() {
      MongoClient = require('mongodb').MongoClient;
      DB_CONN_STR = 'mongodb://localhost:27017/' + dbname;
  }
  /*這里是插入數據*/
  this.insert = function(data,callback) {
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log('連接成功')
      var collection = db.collection(dataform);
      collection.insert(data, function(err,result){
        callback(err,result);
      })
    })
  }
  /*這里是刪除數據*/
  this.remove = function(data,callback){
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log('連接成功')
      var collection = db.collection(dataform);
      collection.remove(data, function(err,result){
        callback(err,result);
      })
    })
  }
  /*這里是修改*/
  this.update=function(data,updata,callback){
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log('連接成功')
      var collection = db.collection(dataform);
      collection.update(data,updata,function(err,data){
        callback(err,data);
      })
    })
  }
  /*這里是查詢*/
  this.find=function(data,callback){
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log('連接成功')
      var collection = db.collection(dataform);
      collection.find(data).toArray(function(err,data){
        callback(err,data);
      })
    })
  }
}

module.exports = mongodbModel;

var mongodbModel = require('./mongodbModel');
var mongodbObject = new mongodbModel('seraph','singer');
mongodbObject.init();

/*這里是插入*/
mongodbObject.insert({name:'啊xx'},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(data);
  }
})

/*這是刪除*/
mongodbObject.remove({name:'啊xiao'},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log('成功刪除指定數據');
  }
})

/*這里是修改*/
mongodbObject.update({name:'小李'},{$set:{name:'小勇'}},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(data);
  }
})

/*這里是條件查詢*/
mongodbObject.find({name:'李洛克'},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(data);
  }
})