Unhandled Error!

			return $this;
		}
 
		public function validation($customFormatMessage = null)
		{
			if (!strlen($this->type))
				throw new Phpr_SystemException('Error applying validation to '.$this->dbName.' column. Column type is unknown. Probably this is a calculated column. Please call the "type" method to set the column type.');
 
			if ($this->_validationObj)
				return $this->_validationObj;
 
			$dbName = $this->isReference ? $this->referenceForeignKey : $this->dbName;