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# mysql_affected_rows

(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

mysql_affected_rows -- Get number of affected rows in previous MySQL operation

## Description

``int mysql_affected_rows` (resource [link_identifier])`

mysql_affected_rows() returns the number of rows affected by the last INSERT, UPDATE or DELETE query associated with `link_identifier`. If the link identifier isn't specified, the last link opened by mysql_connect() is assumed.

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

If the last query was a DELETE query with no WHERE clause, all of the records will have been deleted from the table but this function will return zero.

> Note: When using UPDATE, MySQL will not update columns where the new value is the same as the old value. This creates the possiblity that mysql_affected_rows() may not actually equal the number of rows matched, only the number of rows that were literally affected by the query.

mysql_affected_rows() does not work with SELECT statements; only on statements which modify records. To retrieve the number of rows returned by a SELECT, use mysql_num_rows().

If the last query failed, this function will return -1.

See also: mysql_num_rows().

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