REST WEB SERVICES

REST:

            Stands for: Representational state  transfer

Rest is :

Ø Stateless

Ø Client – server based

Ø HTTP Based

Ø It is not a protocol

Ø Support Both JSON and XML

@RestResource:

In Rest web services we need to implement @Rest Resource annotation .

We need to map endpoint URL  here   .

Syntax: @RestResource(urlMapping =’/endpoint url/*’..

Then we need to implement class with following Http methods

@Httppost  = create

@Httpget = read

@Httpput = update

@Httpatch = update

@Httpdelete = delete

Then we need implement following

Restcontext : it is a container class it holds  twoobjects

Restrequest:  params,requestbody,requestpath

Restresponse: return messages etc

@RestResource(urlMapping = '/v29/account/*')

    global class restwebservices{

   

    @Httpget

    global static account getdetails(){

        Restrequest req = restcontext.request;

        Restresponse res = restcontext.response;

        string name = req.requestURI.substring(req.requestURI.lastindexof('/')+1);

        account a = [select id,name,phone,type,website,rating from account where name =: name];

        return a;

   

    }

    @Httppost

    global static id createaccont(string name,string phone,string website){

        Restrequest req = restcontext.request;

        Restresponse res = restcontext.response;

        account a = new account();

        a.name = name;

        a.phone = phone;

        a.website = website;

        insert a;

        return a.id;

        }

  }