ajax cross domain

@RequestMapping(value="/crossAjax")

@ResponseBody

public String crossAjax(HttpServletRequest request){

String callback=request.getParameter("callback");

System.out.println("-----" + callback);

System.out.println("-----" + request.getParameter("query"));

JSONObject obj=new JSONObject();

try {

obj.put("message", "test1");

obj.put("time", "test1");

} catch (JSONException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println(obj.toString());

return callback + "(" + obj.toString() + ")"; 

}

        $.ajax({

               url : "http://127.0.0.1:8080/home/crossAjax",

       data : {query:"select * from ssssss"},

       dataType : "jsonp",

       jsonp : "callback",

       success: function(data) {

   console.log('성공 - ', data);

       },

               error: function(xhr) {

  alert('실패 - ' +  xhr.statusText);

       }

        });

postgresql update or insert

CREATE TABLE test2 (id integer primary key, b varchar(10), c varchar(10), dt timestamp with time zone);

UPDATE test2 SET dt=CURRENT_TIMESTAMP WHERE id=1;
INSERT INTO test2 (id, b, c, dt)
       SELECT 1,'xxx', 'xZ', CURRENT_TIMESTAMP
       WHERE NOT EXISTS (SELECT 1 FROM test2 WHERE id=1);