(PHP 3>= 3.0.3, PHP 4 )

ifx_affected_rows -- Get number of rows affected by a query


int ifx_affected_rows ( int result_id)

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

= 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().

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