@Override
 public void printOn(JwSqlBuffer out, String value) {
   if (value == null) out.printNull();
   else {
     out.printTick();
     out.escape(value);
     out.printTick();
   }
 }
 @Override
 public void printOn(JwSqlBuffer out, Long value) {
   if (value == null) out.printNull();
   else out.printLiteral(value.toString());
 }