update mall_goods
set stock = stock - #{cnt},
volume = volume + #{cnt}
where id=#{id} and stock - #{cnt} = ]]> 0
update mall_goods
set stock = stock + #{cnt},
volume = volume - #{cnt}
where id=#{id} and volume - #{cnt} = ]]> 0
update mall_goods
set carriage_rule_id = null
where id=#{id}
update mall_goods
set carriage_amount = null
where id=#{id}