mysql计算时间差-本例为计算分钟差然后/60计算小时保留一位小数，由于直接得小时只会取整
-- ORDER_TIME datetime NOT NULL（字段类型）
SELECT
so.`ID`,so.`ORDER_TIME`,NOW(),CONCAT(ROUND(TIMESTAMPDIFF(MINUTE,so.`ORDER_TIME`,NOW())/60,1),'') AS hourLater
FROM se_seal_order so
WHERE so.id=#{orderId};
-- ORDER_TIME datetime NOT NULL（字段类型）
SELECT
so.`ID`,so.`ORDER_TIME`,NOW(),CONCAT(ROUND(TIMESTAMPDIFF(MINUTE,so.`ORDER_TIME`,NOW())/60,1),'') AS hourLater
FROM se_seal_order so
WHERE so.id=#{orderId};
