android - Update query is not working in sqlite -

i have update query in android application. not working properly. when clicking button updating application stops working. code follows-

update.setonclicklistener(new onclicklistener (){              @override             public void onclick(view v) {                 // todo auto-generated method stub              string feched_name = show_name.gettext().tostring();             string get_std_for_update=id_search.gettext().tostring();             string get_new_name = id_update.gettext().tostring();              if(feched_name.matches("")){                 toast.maketext(getapplicationcontext(), "no student selected", toast.length_long).show();                  }                      else {                         if(get_new_name.matches("")){                         toast.maketext(getapplicationcontext(), "new name empty", toast.length_long).show();                          }                         else{                             stddb.execsql("update student set name = "+get_new_name + "where id = "+get_std_for_update);                                 toast.maketext(getapplicationcontext(), "student's name has been updated", toast.length_long).show();                            }                     }               }             }); 

replace query below existing 1 :

stddb.execsql("update student set name = '"+get_new_name + "' id = "+get_std_for_update);  

mark single quote around name , space.

hope helps.