How can i use param in my select query ( see code)

Question

Hi ,
I need to use the param instead of hardcoding the value in the select query , when i did that it is working .
I think the limit of args is only till the end of main and my select query is in a method called Load() .
How can i use the param in my select query .
public static void main(String[] args){
name = args[0];
class= args[1];
new Load();
}//end of main
public Load()
          try {
               Class.forName(JDBC_DRIVER);
               connection = DriverManager.getConnection(DATABASE_URL,"username","pw");
               statement = connection.createStatement();
               //First Query : pin and ticket number
               ResultSet resultSet = statement.executeQuery("SELECT pin , ticketnumber from airport ,year where "+                                                                      "year.year_name= Here i need to use the param (instead of hardcoding) and year.class_year= Here too i need to use param");
}// end of method Load()Edited by: 1sai on Sep 24, 2008 7:34 AM
Edited by: 1sai on Sep 24, 2008 7:35 AM

Answer 1

Might I suggest you change the structure of your program to the following:
public class Load {
  private Connection conn;
  private PreparedStatement statement;
  public Load(String sql) {
    init(sql);
  protected void init(String sql) throws Exception {
    Class.forName(JDBC_DRIVER);
    conn = DriverManager.getConnection(DATABASE_URL, "username", "pw");
    statement = conn.prepareStatement(sql);
  public ResultSet execute(String p1, String p2) throws Exception {
    statement.setString(1, p1);
    statement.setString(2, p2);
    return statement.executeQuery();
  public void close() throws Exception {
    if (statement != null)
      statement.close();
    statement = null;
    if (conn != null)
      conn.close();
    conn = null;
  public static void main(String[] args) throws Exception {
    String sql = args[0];
    String param1 = args[1];
    String param2 = args[2];
    Load load = new Load(sql);
    ResultSet rs = load.execute(param1, param2);
    while (rs.next())
      System.out.println(rs.get(0));
    rs.close();
    load.close();
}This allows you to use the same "Load" object for multiple queries with different parameters.
I do not recommend you actually use the code above in any sort of production application. You should really take a look at Spring Framework along with an ORM tool like Hibernate or Ibatis to simplify your DAO layer.
Hope this helps,
David