Module manual encapsulation for mongodb operations

Module manual encapsulation for mongodb operations

[Note] : This code is based on nodejs.

Create 1 module file *.js in the nodejs directory to call,

Here is the module code:

function mongodbModel(dbname,dataform) {
  var MongoClient;
  var DB_CONN_STR;
  this.init = function() {
      MongoClient = require('mongodb').MongoClient;
      DB_CONN_STR = 'mongodb://localhost:27017/' + dbname;
  }
  /* So here's insert data */
  this.insert = function(data,callback) {
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log(' The connection is successful ')
      var collection = db.collection(dataform);
      collection.insert(data, function(err,result){
        callback(err,result);
      })
    })
  }
  /* This is deleting data */
  this.remove = function(data,callback){
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log(' The connection is successful ')
      var collection = db.collection(dataform);
      collection.remove(data, function(err,result){
        callback(err,result);
      })
    })
  }
  /* So here's the modification */
  this.update=function(data,updata,callback){
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log(' The connection is successful ')
      var collection = db.collection(dataform);
      collection.update(data,updata,function(err,data){
        callback(err,data);
      })
    })
  }
  /* So here's the query */
  this.find=function(data,callback){
    MongoClient.connect(DB_CONN_STR, function(err, db) {
      console.log(' The connection is successful ')
      var collection = db.collection(dataform);
      collection.find(data).toArray(function(err,data){
        callback(err,data);
      })
    })
  }
}

module.exports = mongodbModel;

How to use:

Create 1 call file *.js in the same directory

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

/* This is insertion */
mongodbObject.insert({name:' ah xx'},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(data);
  }
})

/* This is to remove */
mongodbObject.remove({name:' ah xiao'},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(' The specified data was deleted successfully ');
  }
})

/* So here's the modification */
mongodbObject.update({name:' Xiao li '},{$set:{name:' Xiao yong '}},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(data);
  }
})

/* Here's a conditional query */
mongodbObject.find({name:' Lee lok '},function(err,data){
  if(err){
    console.log(err);
  }else{
    console.log(data);
  }
})

Relevant parameters:

dbname: means database to be operated;
dataform: Refers to the table of data to be manipulated;
data: Represents data that needs to be inserted or queried or modified;
updata: Represents the modified data;

callback() is a challenge when it comes to personal encapsulation

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