jdbc

public class UsersDAO {

private Connection con;

public UsersDAO(Connection con){
this.con = con;
}

public UsersDataSet get(long id) throws SQLException{
TExecutor exec = new TExecutor();
return exec.execQuery(con, "select * from users where id=" + id, new TResultHandler<UsersDataSet>(){

public UsersDataSet handle(ResultSet result) throws SQLException {
result.next();
return new UsersDataSet(result.getLong(1), result.getString(2));
}

});
}
}

public class TExecutor {
public <T> T execQuery(Connection connection,
String query,
TResultHandler<T> handler)
throws SQLException {
Statement stmt = connection.createStatement();
stmt.execute(query);
ResultSet result = stmt.getResultSet();
T value = handler.handle(result);
result.close();
stmt.close();

return value;
}

}