Question

For example:

select name from person where id=2;

I wand to know if this row exists, and depending on its existence perform a certain task.
I wan to do this using jdbc.

Answer 1

Use PreparedStatement to invoke this select query,

After the successful execution of query you would have instance of ResultSet returned, you could check by invoking next() if it returns true it means there was a row selected

if(resultSet.next()){
   //yes exist
}