Updated query classes in order to support prepared statements - added support for parameter binding. Added unit tests for mssql select using new prepared statement syntax.

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0-DB@8511 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/db/queryparts/expression/InsertExpression.class.php

@@ -26,6 +26,10 @@
 			if(!isset($value)) return false;
 			return true;
 		}
+		
+		function getArgument(){
+			return $this->argument;
+		}
 	}
 
 ?>