原文地址为：
对Sql进行类似For循环处理
代码
转载请注明本文地址： 对Sql进行类似For循环处理
今天遇到1个很是无语的问题。。。由于开发人员的版本更新导致用户在今天所开之单据的CreatDate都变成了yyyy-MM-dd格式，原本应该为
yyyy-MM-dd hh:mm:ss:fff格式。于是，只能手动更新数据了 -_-!
1
declare
@itemnumber
int
--
定义需要循环的次数
2 declare @tagint int -- 定义标志字段，用于结束循环
3 set @tagint = 1
4 select @itemnumber = count ( distinct Creater) from Demo_TestTable where isnull (Creater, '' ) <> '' And
DATEDIFF ( DAY ,CreatDate, GETDATE ()) < 1
5 if ( @itemnumber > 0 )
6 begin
7 while @tagint <= @itemnumber
8 begin
9 waitfor delay ' 00:00:01 ' -- 每隔一秒再执行 可用参数变量替换
10 Update Demo_TestTable set CreatDate = GETDATE () where Creater = (
11 Select Creater from (
12 select Creater,ROW_NUMBER() over ( order by Creater) as RowID from Demo_TestTable where
isnull (Creater, '' ) <> '' And DATEDIFF ( DAY ,CreatDate, GETDATE ()) < 1 group by Creater
13 ) TableA
14 where TableA.RowID = @tagint
15 )
16 set @tagint = @tagint + 1
17 end
18 end
2 declare @tagint int -- 定义标志字段，用于结束循环
3 set @tagint = 1
4 select @itemnumber = count ( distinct Creater) from Demo_TestTable where isnull (Creater, '' ) <> '' And
DATEDIFF ( DAY ,CreatDate, GETDATE ()) < 1
5 if ( @itemnumber > 0 )
6 begin
7 while @tagint <= @itemnumber
8 begin
9 waitfor delay ' 00:00:01 ' -- 每隔一秒再执行 可用参数变量替换
10 Update Demo_TestTable set CreatDate = GETDATE () where Creater = (
11 Select Creater from (
12 select Creater,ROW_NUMBER() over ( order by Creater) as RowID from Demo_TestTable where
isnull (Creater, '' ) <> '' And DATEDIFF ( DAY ,CreatDate, GETDATE ()) < 1 group by Creater
13 ) TableA
14 where TableA.RowID = @tagint
15 )
16 set @tagint = @tagint + 1
17 end
18 end
当然今天出现的情况因其特殊性有更简单的写法，但此法具体一般性. @tagint即类似于For循环中的i,通过在查询时设置Row_Number()行号来遍历得到每1个需要Update的ID,进而进行相关的处理
转载请注明本文地址： 对Sql进行类似For循环处理