Not really sure what you mean, but all these println-calls make the sketch crash if i use my skype-database^^
I suppose you want to store every message inside of a list, so that every entry has time, user and message.

Then you should create a class for it, this is an example how i would do it. (i didn't look into the database-structure, just copied the filed-names from you code...but it seems to work.)

1. import de.bezier.data.sql.*;
   
   ArrayList<MessageData> data = new ArrayList<MessageData>();
   SQLite db;
   
   void setup() {
     db = new SQLite( this, "main.db" );  // open database file
     if ( db.connect() ) {
       db.query( "SELECT * FROM Messages ORDER BY timestamp" );
       while (db.next ()) {
         data.add(new MessageData(db.getLong("timestamp"), db.getString("from_dispname"), db.getString("body_xml")));
       }
     }
     println(data.size() +" entries");
   }
   
   void draw() {
   }
   
   void mouseReleased() {
     MessageData msg = data.get((int)random(data.size()));
     println(msg.date);
     println(msg.user);
     println(msg.message);
   }
   
   class MessageData {
     Date date;
     String user;
     String message;
     MessageData(long timestamp, String user, String message) {
       this.date = new Date(timestamp*1000);   
       this.user = user;
       this.message = message;
     }
   }
   

btw: the sql-library has the function "getLong()", so you don't have to parse it yourself.

Thank you for the tip. Your solution looks good.