title: Spring Data REST UPSERT Statement
body: <p>I have a Spring REST exported URL where I want to do UPSERT operation. If the row exists it will UPDATE , else it will INSERT. I have earlier been doing POST for CREATE, PATCH for UPDATE and DELETE for Delete.</p>
  
  <p>Is there any way I can have UPSERT operation supported for a URL , using a  PUT or so ?</p>