PDOATTRAUTOCOMMIT

PDOATTRAUTOCOMMIT is a PHP Data Objects (PDO) attribute that controls the autocommit mode for a database connection. When autocommit is enabled, each SQL statement executed through the PDO connection is automatically committed to the database as a separate transaction. This means that changes made by a single statement are immediately permanent.

The default value for PDOATTRAUTOCOMMIT is true, meaning autocommit is enabled by default for most database drivers. To manage transactions manually and group multiple statements into a single atomic unit, you must disable autocommit. This is achieved by setting the PDO::ATTR_AUTOCOMMIT attribute to false using the PDO::setAttribute() method.

When autocommit is disabled, SQL statements are not automatically committed. Instead, you are responsible for explicitly starting a transaction using PDO::beginTransaction(), executing your statements, and then either committing the changes with PDO::commit() or rolling them back with PDO::rollBack() in case of an error. This manual transaction management is crucial for maintaining data integrity in complex operations involving multiple database updates. Understanding and controlling the autocommit setting is essential for effective database interaction with PHP's PDO extension.