如何为存储过程中的变量赋值 [英] how to assign value to variable in stored procedure

问题描述

ALTER proc [dbo].[Sp_Update_OPD_Docket]
@Docket_no varchar(50)
as
Declare @active tinyint
set @active=select IsActive from tbl_OPDappointment where Docket_no=@Docket_no
if (@active<>3)
BEGIN
update tbl_OPDappointment set IsActive=3 where Docket_No=@Docket_no
END

i只想分配价值选择commant到变量active.plz帮助我。我，有需要。





提前致谢

i just want to assign value of select commant to variable active.plz help me out. i , in need.


Thanks in advance

推荐答案

自从您的存储过程只是检查IsActive值是否为3，如果不是，则更新为3，您可以使用此代码实现相同的功能：

Since your stored procedure simply checks whether the IsActive value is 3, and if it''s not, update to 3, you could achieve the same thing with this code:

update tbl_OPDappointment set IsActive=3 
where Docket_No=@Docket_no
and IsActive<>3

请通过_Damian S_读取解决方案1。这是非常好的。



请更改您的查询：

Please, read solution1 by _Damian S_. It''s very good.

Please, change your query:

Declare @active tinyint
set @active=select IsActive from tbl_OPDappointment where Docket_no=@Docket_no

with：

with:

Declare @active tinyint
select @active=COALESCE(IsActive, 0) from tbl_OPDappointment where Docket_no=@Docket_no
--show value
select @active As IsActive

我使用 COALESCE [ ^ ]函数用默认值替换NULL（在本例中为0）。

I use COALESCE[^] function to replace NULLs with default value (in this case with 0).

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