Delphi XE Datasnap REST server for Sencha Ext JS 4+

Creating a simple DataSnap REST server using Delphi XE2 for manage a single table of a database. It will be managed from Sencha Ext Js 4 as client components. Table contains 5 fields (string, number, date, float, boolean) only. Sencha Grid reads/write to backend datastore using JSON. Project must be implement 4 methods SELECT, INSERT, UPDATE, DELETE records.