I have the following SQL code used to insert a new record into my database
DECLARE @CustomerID INT
DECLARE @PropertyID INT
BEGIN TRAN T1
INSERT INTO c_customer (title, f_name, l_name, tel1, tel2, tel3, email, email2,
type, primary_contact, tel1type, tel2type, tel3type)
VALUES(@title, @fname, @lname, @tel1, @tel2, @tel3, @email, @email2,
'Owner', 1, @teltype1, @teltype2, @teltype3)
SET @CustomerID = SCOPE_IDENTITY()
BEGIN TRAN T2
INSERT INTO c_property (address1, address2, address3, post_code, city, county)
VALUES (@address1, @address2, @address3, @postcode, @city, @county)
SET @PropertyID = SCOPE_IDENTITY()
UPDATE c_property
SET invoice_flag = @PropertyID
WHERE c_property = @PropertyID
BEGIN TRAN T3
INSERT INTO c_customer_assignment
VALUES (@PropertyID, @CustomerID)
COMMIT TRAN T1
COMMIT TRAN T2
COMMIT TRAN T3
SELECT @CustomerID, @PropertyID
This code works as I want it to, making sure that the added details are linked correctly using the c_customer_assignment
table, however it does look overly complicated and I was wondering if I had taken the right approach to solving the problem (Not sure if I even need the nested transactions at all).
I know at least one transaction is needed, as I do need to make sure records don't get mismatched due to other users inserting at the same time.
Do I also need to review transaction isolation too, or is this enough?
You just need one transaction:
DECLARE @CustomerID INT
DECLARE @PropertyID INT
BEGIN TRAN T1
INSERT INTO c_customer (title, f_name, l_name, tel1, tel2, tel3, email, email2, type, primary_contact, tel1type, tel2type, tel3type)
VALUES(@title, @fname, @lname, @tel1, @tel2, @tel3, @email, @email2, 'Owner', 1, @teltype1, @teltype2, @teltype3)
SET @CustomerID = SCOPE_IDENTITY()
INSERT INTO c_property (address1, address2, address3, post_code, city, county)
VALUES (@address1, @address2, @address3, @postcode, @city, @county)
SET @PropertyID = SCOPE_IDENTITY()
UPDATE c_property
SET invoice_flag = @PropertyID
WHERE c_property = @PropertyID
INSERT INTO c_customer_assignment
VALUES (@PropertyID, @CustomerID)
COMMIT TRAN T1
SELECT @CustomerID, @PropertyID
Use try catch instead of some many trasactions.. BEGIN TRANSACTION; BEGIN TRY ---your dml operation should go here --- END TRY BEGIN CATCH ---CATCH ERROR HERE AND ROLLBACK OPERATIONS HERE IF @@TRANCOUNT > 0 ROLLBACK TRANSACTION; END CATCH; IF @@TRANCOUNT > 0 COMMIT TRANSACTION; GO
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