Run sql query on a different thread

Question

Hello,
I have a swing app that queries an MS SQL database and it works fine and everything happens in the same thread. However for improved performance and to avoid freeze ups, I want the SQL queries themselves to execute on a different thread as a different class, other than the swing app class. The query results (Result Set) I want them back to my swing app so I can present them on a JTable.
Here is an example of what I am trying to accomplish:
- Press button in my swing app.
- Call class that implements Runnable
- In the Run method of the new class do the following (this code will execute in a new thread):
url = "jdbc:sqlserver://ServerName:1433;databaseName=Database;user=UserName;password=password";
try{
     Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
     Connection con = DriverManager.getConnection(url);
     Statement stmt;
     ResultSet rs;
     stmt = con.createStatement();
     String queryString = "select * from databaseName";
     rs = stmt.executeQuery(queryString);
      con.close();
catch(Exception em){
      em.printStackTrace();
     JOptionPane.showMessageDialog(null,em.toString());
}- Get the ResultSet rs back from the class
- Work with the results back in my swing app and present them in the JTable
while(rs.next()){
            //do some stuff
     }Any help or hints are greatly appreciated.
Thanks,
Chris

Answer 1

Two suggestions:
-- Take a look at SwingWorker for taking care of the threading issues
-- Keep all database handling code together. Collect the records into a Collection -- most likely ArrayList -- and return that. This way you can close the Connection and RecordSet within the same method that opens them.
Just my 0.02.
db