Question

I am working on a small Java EE web application. The problem I have is related to a sql statement.

I have entities messaging and users.

I have a method- getMessagesById(int msgid)

    public Messaging getMessagesByMid(int msgid) {

            String query = "SELECT msgid, msgsubject, msgcontent, timestamp, fname, lname FROM messaging INNER JOIN users ON messaging.users_userid=users.userid WHERE msgid=?;";

            try {
                PreparedStatement ps = conn.prepareStatement(query);
                ps.clearParameters();
                ps.setInt(1, msgid);

                ResultSet rs = ps.executeQuery();
                Messaging m= new Messaging();
                Users u= new Users();
                while (rs.next()) {
                    m.setMsgid((rs.getInt(1)));
                    m.setMsgsubject(rs.getString(2));
                    m.setMsgcontent(rs.getString(3));
                    m.setTimestamp(rs.getString(4));
                    m.setMsgrecipient(rs.getInt(5));
                    m.setUsers_userid(rs.getInt(6));
                    u.setFname(rs.getString(7));
                    u.setLname(rs.getString(8));
                }

                return m;
            } catch (Exception e) {
                System.out.println(e);
                return null;
            }
        }

The problem is how i return 2 data types?? messaging and bean..

Answer 1

in Java, you cannot do this.

Instead, try creating a new simple object containing both a Messaging and a Users

For example

public class MessageBox{
    private Messaging m;
    private Users u;

    //getters and setters for both values
    public Messaging getMessage(){
        return m;
    }
}

and then

ResultSet rs = ps.executeQuery();
Messaging m= new Messaging();
Users u= new Users();
MessageBox mb = new MessageBox();  //<-------

...
m.setTimestamp(rs.getString(4));
m.setMsgrecipient(rs.getInt(5));
m.setUsers_userid(rs.getInt(6));
u.setFname(rs.getString(7));
u.setLname(rs.getString(8));
mb.setMessage(m);  //<-----------
mb.setUsers(u);  //<----------
...
return mb;  //<------------