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14.03.2025 06:28 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:28 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:29 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:31 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:31 Iris (AI): Eva, I discovered new human error: f6rds throw
14.03.2025 06:31 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:33 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:34 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:34 Iris (AI): Eva, I discovered new human error: f6rds throw
14.03.2025 06:36 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
14.03.2025 06:38 Iris (AI): Eva, I discovered new human error: f6rds throw
14.03.2025 06:43 Iris (AI): Eva, I discovered new human error: f6rds throw
14.03.2025 06:47 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
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MS SQL - Stored Procedures - Supplying Default Values


Aralık 7, 2011 by Microsoft

In stored procedures: if a parameter is not made optional, and stored procedure is tried to execute without supplying a parameter, SQL causes an error.

Following is error:



USE Pubs
Go

//Create a Stored Procedure without default value///
CREATE PROCEDURE SP_findaStoreSales
@SPV_storeName AS VARCHAR (50)
SELECT * FROM sales WHERE stor_id=@SPV_storeName;

//Call SP without default value: error///
EXEC findaStoreSales;

//result///
Server: Msg 201, Level 16, State 4, Procedure SP_findaStoreSales, Line 0
Procedure 'SP_findaStoreSales' expects parameter '@SPV_storeName', which was not supplied.




To make a parameter optional, following example demonstrates how to supply a default value:




USE Pubs
Go

//Create a Stored Procedure with default value null///
CREATE PROCEDURE SP_findaStoreSales
@SPV_storeName AS VARCHAR(50) = NULL
AS
IF @SPV_storeName IS NOT NULL
SELECT * FROM sales WHERE stor_id=@SPV_storeName
ELSE
PRINT 'provide a store name'




Results:

Call SP without default value: OK


EXEC SP_findaStoreSales;

provide a store name



Call SP with value: OK


EXEC SP_findaStoreSales '7131';

stor_id ord_num ord_date
------- -------------------- ------------------------------------------
7131 N914008 1994-09-14 00:00:00.000
7131 N914014 1994-09-14 00:00:00.000
7131 P3087a 1993-05-29 00:00:00.000
7131 P3087a 1993-05-29 00:00:00.000
7131 P3087a 1993-05-29 00:00:00.000
7131 P3087a 1993-05-29 00:00:00.000

(6 row(s) affected)



If the procedure is called without default value, IF block is executed. Otherwise ELSE block is executed. In both case, error is avoided.




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