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

Execute Web services in WorkBench:

/Services/apexrest/v40/account/

@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;
        }
  }