sql="update dc_base_cost_first_finish set change_rate="+(item.diff*100/item.pre_avl_sku_cost_first)+",exception_type="+(item.diff>0?1:(item.diff<0?2:0))+" where id="+item.id;
sql="update dc_base_cost_first_finish set change_rate="+(item.diff*100/item.pre_avl_sku_cost_first)+",exception_type="+(item.diff>0?1:(item.diff<0?2:0))+" where id="+item.id;