本文介绍了检查存储过程中参数是否为空或为空的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我知道如何检查参数是否为空,但是我不确定如何检查其是否为空...我有这些参数,我想检查先前的参数为空还是为空,然后像下面那样设置它们
I know how to check if a parameter is null but i am not sure how to check if its empty ... I have these parameters and I want to check the previous parameters are empty or null and then set them like below
ALTER PROCEDURE [dbo].[GetSummary]
@PreviousStartDate NVARCHAR(50) ,
@PreviousEndDate NVARCHAR(50) ,
@CurrentStartDate NVARCHAR(50) ,
@CurrentEndDate NVARCHAR(50)
AS
BEGIN
IF(@PreviousStartDate IS NULL OR EMPTY)
SET @PreviousStartdate = '01/01/2010' for example..
我将很感谢您的帮助.
推荐答案
我有时会使用 NULLIF 就像这样...
I sometimes use NULLIF like so...
IF NULLIF(@PreviousStartDate, '') IS NULL
可能没有理由比@Oded和@bluefeet所建议的方式更好,只是风格上的偏爱.
There's probably no reason it's better than the way suggested by @Oded and @bluefeet, just stylistic preference.
@danihp的方法确实很酷,但是当我以为空或空的时候,我疲倦的老大脑就不会灰飞烟灭了:-)
@danihp's method is really cool but my tired old brain wouldn't go to COALESCE when I'm thinking is null or empty :-)
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