// data tables
 
	protected $use_datatable = false;
 
	protected $datatable_name = '';
 
	// define the fields of the data_table
	// named array field_name => field_type
	// field_type can be all types of mysql, but the notation must include the field length, e.g. VARCHAR(30) or TINYINT(4) OR INT(11)
 
 
	protected $datatable_fieldlist = array();
	protected $datatable_mapping = array();
	protected $datatable_canupdate = false;
 
	protected $datatable_followstatus = false;