MySQL Transactions - Real Examples Tutorial

Implement a Bank Transfer Transaction

Write SQL statements to transfer funds between two accounts using a transaction. Include error handling to rollback if the sender has insufficient funds.

Expected output: A transaction that either completes the transfer or rolls back without changing balances.

Hint: Use START TRANSACTION, check balances, update accounts, and commit or rollback accordingly.

Create an Inventory Update Transaction

Write a transaction that checks product stock before deducting the ordered quantity. Rollback if stock is insufficient.

Expected output: Stock is only updated if sufficient quantity exists; otherwise, no changes occur.

Hint: Use SELECT ... FOR UPDATE to lock the row, then update stock and commit or rollback.

A transaction ensures that a group of SQL statements execute as a single unit, maintaining data integrity by committing all changes or rolling back if any statement fails.

You start a transaction with START TRANSACTION or BEGIN, and end it with COMMIT to save changes or ROLLBACK to undo them.

Short transactions reduce locking time, improving concurrency and preventing deadlocks or performance degradation.