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Editorial Team
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Asked: 2026-06-02T16:09:52+00:00

In the MySQL docs, there is a note about using mysql_affected_rows after a transaction

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In the MySQL docs, there is a note about using mysql_affected_rows after a transaction commit:
http://php.net/manual/en/function.mysql-affected-rows.php

Note: Transactions
If you are using transactions, you need to call mysql_affected_rows() after your INSERT, UPDATE, or DELETE query, not after the COMMIT.

However, there is no such note on the PDOStatement::rowCount doc:
http://www.php.net/manual/en/pdostatement.rowcount.php

Does this mean the commit will not affect the affected rows count after INSERT, UPDATE or DELETE queries when using the PDO object?

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  1. Editorial Team

    A PDOStatement is returned for each query that is executed. You will be able to use PDOStatement->rowCount() at any time in your code (during or after a transaction and rollback/commit doesn’t matter). Each object takes care of maintaining itself.

    The reason mysql_affected_rows has that transaction note is because it is only aware of a single mysql connection resource. This means that when you complete the transaction (commit/rollback) a new query has been sent to the DB, thus altering which result is being processed for the number of affected rows.

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