Need a query,which will do a comparison and if it doesnt satisfy the condition it should raise an error by using raiserror statement

Question

I have a Table called Test_ X in which there are two fields:
1) date_value
2)Application_Name
requirement: we have to calculate the number of days ramaining through date_value field and  compare it to  with n days.
if it is less than n days it should raise an error through raiserror statement.
I get the below logic to get the no of days before expiry:
select GETDATE() 'Today Date',
date_value 'expiry date',
abs(DATEDIFF(dd,date_value,getdate()))'No of days before expiry'
from dbo.Test_X
where Application_Name='xyz'
With above satatement am able to get the Number of days before expiry .
my question is how to comare it with a variable say n days and if is less than n days it should raise an by using raiserror statement .
Please help or advice.

Answer 1

You can use variables in the RAISERROR, but not expressions, e.g.
DECLARE @Days INT;
SET @Days = ABS(datediff(day, '19000101', CURRENT_TIMESTAMP));
RAISERROR (
N'This is message %s %d.'
,-- Message text.
10
,-- Severity,
1
,-- State,
N'number'
,-- First argument.
@Days
);-- Second argument
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