One Statement - Many ResultSets??

Question

Hey Folks,
how good of an idea is it to use just one DB Statement and than make many queries on it ending up in different resultsets:
Like this:
try
               Class.forName("com.mysql.jdbc.Driver").newInstance ();
               con = DriverManager.getConnection (url, benutzer, passwort);
               stmt = verbindung.createStatement();
          catch (Exception e)
               e.printStackTrace();
ResultSet rs7 = null;          
          try {
               rs7 = stmt.executeQuery("SELECT * FROM artikel WHERE `artikel_nr` = " + artikelnr);
               while ( rs7.next() ) {
                    level = rs7.getInt("persopreislevel");
          } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
rs7.close();
ResultSet rs8 = null;          
          try {
               rs8 = stmt.executeQuery("SELECT * FROM artikel WHERE `artikel_nr` = " + artikelnr);
               while ( rs8.next() ) {
                    level = rs8.getInt("persopreislevel");
          } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
rs8.close();Or would I have to create one Statement per ResultSet?? How do I avoid creating to many Objects??
My Problem is that i get NoOperationAllowed after ResultSet closed Errors once in a while, even though I am using different Resultsets but JDBC Api says 1 ResultSet per Statement right?
Best regards
Edited by: eCashier on Apr 1, 2008 7:26 AM

Answer 1

Why not use a prepared statement and then a loop iterating through the parameters that you want to supply to the query instead of hardcoding eight queries that do essentially the same thing?
But no, there's no profound overhead from opening multiple resultsets in sequence as long as you close them when you're done with them. You should close them in a finally block. The overhead from the result set objects is unlikely to be significant as long as they're closed.