How to Properly Manage Transactions in MySQLi?

Handling Transactions in MySQLi

Transactions play a crucial role in database operations, ensuring data consistency and reliability. In MySQLi, transactions are initiated and concluded using specific commands.

To begin a transaction, you correctly mentioned the need to execute $mysqli->autocommit(FALSE);. This disables the automatic committing of changes made to the database, allowing you to group multiple queries into a single transaction.

Once the transaction is initiated, all subsequent queries will be held in a buffer until either a $mysqli->commit(); or $mysqli->rollback(); command is issued.

The $mysqli->commit(); command finalizes the transaction, permanently applying the changes made to the database. In contrast, $mysqli->rollback(); cancels the transaction and discards any uncommitted changes.

In the code example you provided, the first transaction is initiated and concluded correctly with $mysqli->autocommit(FALSE); and $mysqli->commit();. However, it's important to note that subsequent queries outside of the transaction will be executed without transaction control.

To start a new transaction, you must disable autocommit again:

$mysqli->autocommit(FALSE);

Once the second transaction is complete, it can be committed as before:

$mysqli->commit();

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