Verify Records Before Updating in Stored Procedure - tsql

Question

Let's say I have 2 counties:
A
B
Each has it's own URL:
www.A.com
www.B.com
I have a stored procedure that accepts 3 variables to enable or disable the service to the URL. The #Enable variable is required but the user can enter the #County_Code or #WebserviceURL variables - or both. But if they enter both, I want to verify that the record exits in the database.
For example,
EXEC [dbo].usp_webservice_change_status
#enable = 1,
#county_code = 'A',
#webserviceURL = 'www.A.com';
should execute and update the Enable flag.
But if I execute with the following values, I would like to have an error returned stating something to the effect that County A does not have a corresponding value of www.B.com.
EXEC [dbo].usp_webservice_change_status
#enable = 1,
#county_code = 'A',
#webserviceURL = 'www.B.com';
Here is the complete stored procedure:
ALTER PROCEDURE [dbo].[usp_webservice_change_status]
#enable AS BIT,
#county_code AS CHAR(2) = NULL,
#webserviceURL AS VARCHAR(4000) = NULL
AS
BEGIN
SET NOCOUNT ON;
IF #enable IS NULL
RAISERROR ('The value for #enable should not be null', 15, 1);
IF ( #county_code IS NULL AND #webserviceURL IS NULL )
RAISERROR ('The value for #county_code and #webserviceURL cannot both be null', 15, 1);
IF ( #county_code IS NOT NULL AND #webserviceURL IS NULL )
UPDATE dbo.webservice_config
SET [enable] = #enable,
comments = CASE
WHEN #enable = 1 THEN 'Enabled by ' + SUSER_SNAME()
ELSE 'Disabled by ' + SUSER_SNAME()
END
WHERE county_code = #county_code
ELSE IF (#county_code IS NULL AND #webserviceURL IS NOT NULL )
UPDATE dbo.webservice_config
SET [enable] = #enable,
comments = CASE
WHEN #enable = 1 THEN 'Enabled by ' + SUSER_SNAME()
ELSE 'Disabled by ' + SUSER_SNAME()
END
WHERE webservice_URL = #webserviceURL
ELSE IF ( #county_code IS NOT NULL AND #webserviceURL IS NOT NULL )
UPDATE dbo.webservice_config
SET [enable] = #enable,
comments = CASE
WHEN #enable = 1 THEN 'Enabled by ' + SUSER_SNAME()
ELSE 'Disabled by ' + SUSER_SNAME()
END
WHERE ( county_code = #county_code AND webservice_URL = #webserviceURL )
END;

Answer 1

You could do this with another IF statement if I understand what you want correctly... just add these two lines at the bottom of your PROCEDURE just before your END;
IF(##ROWCOUNT) < 1
RAISERROR('Nothing Updated Due to Non Matching Records',15,1)
So it will look like this
--all your other code
WHERE ( county_code = #county_code AND webservice_URL = #webserviceURL )
IF(##ROWCOUNT) < 1
RAISERROR('Nothing Updated Due to Non Matching Records',15,1)
END;
You could also wrap the entire thing in another IF if you want
ELSE IF ( #county_code IS NOT NULL AND #webserviceURL IS NOT NULL )
IF(SELECT 1 FROM dbo.webservice_config WHERE county_code = #county_code AND webservice_URL = #webserviceURL) < 1
RAISERROR('Nothing Updated Due to Non Matching Records',15,1)
ELSE
UPDATE dbo.webservice_config
SET [enable] = #enable,
comments = CASE
WHEN #enable = 1 THEN 'Enabled by ' + SUSER_SNAME()
ELSE 'Disabled by ' + SUSER_SNAME()
END
WHERE ( county_code = #county_code AND webservice_URL = #webserviceURL )
END;
You could also use EXISTS and other syntax instead of what I used... just some examples.