How to construct my finished program?

Hi all,

I have asked a few questions on here recently, seeking answers to complete a task where I read from a database and then write the results, as fixed length values, to a text file.

I have successfully acheived this on a test scale, thanks to all your help.

However,
What I need to deliver is a small GUI that the user will use to choose which of the 3 QUERIES to run (to date I have generated a program that uses one of the Queries)

Each one will have a different select statement with a different number/format of fields.
Each of them will need to write to a text file (with a different file name)

My questions are as follows:

• I have one datasource that all 3 will need to connect to.
  How would I specify it once to avoid needless duplication?

• How would I construct it so that I have a simple JFrame where the user chooses which program to run?

here is what I have for one of the programs:

Code:

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import java.sql.*;
import java.io.*;
import java.io.FileWriter;


class PSResData {

    public static String padRight(String s, int n) {
        return String.format("%1$-" + n + "s", s).substring(0, n);


    }

    public static String padLeft(String s, int n) {
        // Method to pad out the database fields
        // Call for each field with the specified length
        return String.format("%1$#" + n + "s", s);
    }

    public static void main(String args[]) throws SQLException, IOException {

        DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
        int count = 0;
       
        String serverName = "francisca";
        int port = 1521;
        String user = "niku";
        String password = "niku";
        String SID = "nikuuat";
        String URL = "jdbc:oracle:thin:@" + serverName + ":" + port + ":" + SID;

        Connection conn = DriverManager.getConnection(URL, user, password);
        String SQL = "SELECT '25000', DECODE(IS_ACTIVE, 1, 'A', 'I'), UNIQUE_NAME, " +
" FIRST_NAME||LAST_NAME FROM NIKU.SRM_RESOURCES ";

        String newLine = System.getProperty("line.separator");


        Statement stat = conn.createStatement();
        ResultSet rs = stat.executeQuery(SQL);
        FileWriter fout = new FileWriter("c:\\test.txt"); //Create new file stream
       
        while (rs.next()) { //cycle through result set
            count++;
            String counter = ""+count;           

            fout.write(
                      padRight(rs.getString(1), 5) +
                      padRight(rs.getString(2), 1) +
                      padRight(rs.getString(3), 11) +
                      padRight(rs.getString(4), 60) + newLine
                      );
        }

        fout.close();  //close file stream
        System.out.println("Complete");
        stat.close();
        conn.close();

  }


}

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Thank you all again for your assistance,
Matt