Question

是否可以通过一个查询更新和递增几行的值？

我有以下餐桌服务：

id | name | count | created_at | updated_at

我希望每次用户在搜索中选择某些服务时都更新计数（这是通过GUI完成的，用户可以选择一个或多个服务，而我正在获取这些服务的ID）。< / p>

当选择多个服务时，我可以对每个服务执行一个查询，但这似乎不是很有效。

示例：

我需要一次更新7个服务，并为每个服务增加计数值：

UPDATE services SET count = count + 1 WHERE id = 28

UPDATE services SET count = count + 1 WHERE id = 29

UPDATE services SET count = count + 1 WHERE id = 39

UPDATE services SET count = count + 1 WHERE id = 44

UPDATE services SET count = count + 1 WHERE id = 296

UPDATE services SET count = count + 1 WHERE id = 294

UPDATE services SET count = count + 1 WHERE id = 111

是否可以在一个查询中执行此更新？

Answer 1

我需要一次更新7个服务并增加计数值他们每个人：

UPDATE services SET count = count + 1 WHERE id = 28

UPDATE services SET count = count + 1 WHERE id = 29

UPDATE services SET count = count + 1 WHERE id = 39

UPDATE services SET count = count + 1 WHERE id = 44

UPDATE services SET count = count + 1 WHERE id = 296

UPDATE services SET count = count + 1 WHERE id = 294

UPDATE services SET count = count + 1 WHERE id = 111

是否可以在一个查询中执行此更新？

可以重写为一个查询。

查询

UPDATE 
 services 
SET 
 count = count + 1 
WHERE
 id IN(28, 29, 39, 44, 296, 294, 111)

Answer 2

您可以尝试这样：

update table set `count` = `count` + 1

以上查询将更新所有行。
如果要更新特定行，可以在以下条件中添加：

update table set `count` = `count` + 1 where name = 'searchText'

MySQL-通过一个查询增加几行的值

2 个答案: