Add fetchObject method to Firebird_result class

drivers/firebird/firebird_result.php

@@ -30,6 +30,7 @@ class Firebird_Result extends PDOStatement {
 	public function __construct($link)
 	{
 		$this->statement = $link;
+		$this->setFetchMode(PDO::FETCH_ASSOC);
 	}
 	
 	// --------------------------------------------------------------------------
@@ -166,6 +167,19 @@ class Firebird_Result extends PDOStatement {
 	
 	// --------------------------------------------------------------------------
 
+	/**
+	 * Emulate PDOStatement::fetchObject, but only for the default use
+	 * 
+	 * @param int $colum_num
+	 * @return mixed 
+	 */
+	public function fetchObject($class_name='stdClass', $ctor_args=array())
+	{
+		return $this->fetch(PDO::FETCH_OBJ);
+	}
+
+	// --------------------------------------------------------------------------
+
 	/**
 	 * Return the number of rows affected by the previous query
 	 *