Key Methods and Properties of Mongoose

connect()	createConnection()	schema()
Model()	Document()	disconnect()

connect()

Opens the default mongoose connection.
Syntax:
connect(uri(s), [options], [callback])
Example:

var mongoose=require('mongoose');
mongoose.connect("mongodb://mongodb.tutorialtous.com/mongoose",function(error){
  if(error){
    console.log("error"+error);
  }else{
    console.log("open done")
  }
});

• Once we call this method it will call Connection’s open() or openSet() method.
• When connection success ‘connection’ property is set with the opened connection. Means ‘mongoose.connection’ will holds connection information.

Check this example for clarity

mongoose.connect("mongodb://mongodb.tutorialtous.com/mongoose",function(error){
console.log("open done"+mongoose.connection.host+"\t"+ mongoose.connection.port)
  if(error){
    console.log("error"+error);
  }else{
  }
});

In the above after connection open it will echos connection’s host and port details.

createConnection()

Will creates a connection instance and its work is similar to connect() mentioned above
Syntax:
createConnection([uri], [options], [options.config], [options.config.autoIndex])
Note:-

• All arguments are optional for this method.
• returns mongoose.Db property
• If have uri and other arguments it will proxy(calls) connection.open() or connection.openSet().
• If we doesn’t pass any arguments using the returned mongoose.Db’s open(),openSet() method we can open connections.

Example:

var mongoose= require("mongoose");
var db =mongoose.createConnection("mongodb://mongodb.tutorialtous.com/mongoose",
  function(error){if(!error){
  console.log("open connection done");
  }});

var mongoose= require("mongoose");
var db = mongoose.createConnection();
db.open("mongodb://mongodb.tutorialtous.com/mongoose",function(error){
  if(!error){
  console.log("open connection done");
  }
});

Schema()

The Mongoose Schema constructor
Syntax:
   Schema()
Example:-

var mongoose=require('mongoose');
var MySchema = mongoose.Schema;
var schemaref = new MySchema();

Model()

The Mongoose Model constructor..
Check this link to know about Model’s Constructor and other methods

Document()

The Mongoose Document constructor.
Check this link to know about Document Constructor and other methods

disconnect()

Disconnects all connections.

Syntax:-
   Disconnect([function])

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