Importing bits and pieces

This is the initial import based on a few files I had around.

includes/core/dao.inc.php

@@ -0,0 +1,20 @@
+<?php
+
+abstract class DAO
+{
+	private $database;
+
+	public final function setDatabase( Database $database )
+	{
+		if ( $this->database !== null ) {
+			throw new Exception( "trying to change DAO database" );
+		}
+		$this->database = $database;
+	}
+
+	protected final function query( $query , $prepare = false )
+	{
+		return $this->database->query( $query , $prepare );
+	}
+}
+