public function join($element)
	{
		if($element->slave!==null)
			$this->join($element->slave);
		if(!empty($element->relation->select))
			$this->selects[]=$element->getColumnSelect($element->relation->select);
		$this->conditions[]=$element->relation->condition;
		$this->orders[]=$element->relation->order;
		$this->joins[]=$element->getJoinCondition();
		$this->joins[]=$element->relation->join;
		$this->groups[]=$element->relation->group;
		$this->havings[]=$element->relation->having;

		if(is_array($element->relation->params))
		{
			if(is_array($this->params))
				$this->params=array_merge($this->params,$element->relation->params);
			else
				$this->params=$element->relation->params;
		}
		$this->elements[$element->id]=true;
	}