how to handle procedure wrong input parameters error using exception block - sql-server

Question

CREATE PROCEDURE sp_product_listing
(
#product varchar(30),
#month datetime,
#year datetime
)
AS
SELECT
'product_name' = products.name,
products.unit_price,
products.quantity_in_stock,
'supplier_name' = suppliers.name
FROM
suppliers
INNER JOIN
products ON suppliers.supplier_id = products.supplier_id
INNER JOIN
order_details ON products.product_id = order_details.product_id
INNER JOIN
orders ON order_details.order_id = orders.order_id
WHERE
products.name = #product
AND MONTH ('orders.order_date') = #month
AND YEAR ('orders.order_date') = #year;
GO
When some try to execute the procedure with wrong input, instead of getting this error message catch in exception block
Msg 8114, Level 16, State 5, Procedure sp_product_listing, Line 0
Error converting data type varchar to datetime.

Answer 1

From my comments : It is impossible to validate the input pram of an SP inside the same sp !
You need to undergo a validation of input prams.
So hear is an simple example to do this with error handling method.
GO
CREATE PROCEDURE ERROR_TEST
(
#month DATETIME,
#year DATETIME
)
AS
BEGIN
SELECT
MONTH (#month) [month],
YEAR (#year) [year]
END
GO
Now create a similar sp with same input prams.
GO
CREATE PROCEDURE ERROR_TEST_1
(
#month_1 VARCHAR(50),
#year_1 VARCHAR(50)
)
AS
BEGIN TRY
EXEC ERROR_TEST #month_1,#year_1
END TRY
BEGIN CATCH
IF ERROR_NUMBER() = 8114 --> update asper your error OR set > 0
BEGIN
PRINT 'INVALID MONTH OR YEAR'
END
END CATCH;
GO
Sample Execution :
EXEC ERROR_TEST_1 '1','2' ---> Error result
EXEC ERROR_TEST_1 '2015-11-15','2015-11-15'---> correct result