How Can Try/Catch Blocks Ensure Atomic Transaction Execution in SQL Server?

Correct Transaction Handling in SQL Server

Introduction:

Transactions in SQL Server play a crucial role in ensuring data integrity and consistency. They allow multiple database operations to be executed as a single atomic unit. In this article, we will delve into the correct usage of transactions and address a specific scenario involving two SQL commands that require either both to succeed or both to fail.

Problem Description:

The provided SQL script attempts to use a transaction to ensure the atomic execution of two commands: an INSERT and an UPDATE. However, due to some error in the UPDATE command, the script fails to execute it successfully. The INSERT command, however, is executed without issue.

Utilizing a Try/Catch Block:

To resolve this issue, we can implement a try/catch block around the transaction. This block will allow the code to execute the transaction successfully and commit the changes if no errors occur. In case of any errors within the transaction, the catch block will trigger and roll back all the changes made within the transaction.

Revised Script:

BEGIN TRANSACTION [Tran1]

  BEGIN TRY

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