ifx_affected_rows

Description

result_id is a valid result id returned by ifx_query() or ifx_prepare().

Returns the number of rows affected by a query associated with result_id.

For inserts, updates and deletes the number is the real number (sqlerrd[2]) of affected rows. For selects it is an estimate (sqlerrd[0]). Don't rely on it. The database server can never return the actual number of rows that will be returned by a SELECT because it has not even begun fetching them at this stage (just after the "PREPARE" when the optimizer has determined the query plan).

Useful after ifx_prepare() to limit queries to reasonable result sets.

例子 1. Informix affected rows <?php $rid = ifx_prepare("select * from emp                      where name like " . $name, $connid); if (! $rid) {     /* ... error ... */ } $rowcount = ifx_affected_rows($rid); if ($rowcount > 1000) {     printf ("Too many rows in result set (%d)\n<br />", $rowcount);     die ("Please restrict your query<br />\n"); } ?>

See also ifx_num_rows().