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DROP PROCEDURE IF EXISTS InsertSupplierProduct;
DELIMITER $$
CREATE PROCEDURE InsertSupplierProduct(
IN inSupplierId INT,
IN inProductId INT
)
BEGIN
DECLARE message VARCHAR(255) DEFAULT '';
DECLARE SupplierIdCount INT;
DECLARE DuplicateKey CONDITION for 1062;
DECLARE CONTINUE HANDLER FOR DuplicateKey SELECT CONCAT('Duplicate key (',inSupplierId,',',inProductId,') occurred') INTO message; # Most specific and will alway handle the error.
DECLARE CONTINUE HANDLER FOR SQLSTATE '23000' SELECT 'SQLSTATE 23000' INTO message; # Next most specific and will handel the error if there is not one for the error code.
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SELECT 'SQLException encountered' INTO message; # Least specific. Only handles exceptions that have no SLQSTATE or error code handler.
-- insert a new row into the SupplierProducts
INSERT INTO SupplierProducts(supplierId,productId)
VALUES(inSupplierId,inProductId);
-- return the products supplied by the supplier id
SELECT COUNT(*) INTO SupplierIdCount
FROM SupplierProducts
WHERE supplierId = inSupplierId;
IF message = '' THEN
SELECT SupplierIdCount AS 'SupplierId Count';
ELSE
SELECT message, SupplierIdCount AS 'SupplierId Count';
END IF;
END$$
DELIMITER ;