PHP. Руководство по PHP. 2005

ifx_affected_rows

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ifx_affected_rows

(PHP 3>= 3.0.3, PHP 4, PHP 5)ifx_affected_rows -- Get number of rows affected by a query

Description

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.

Пример 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");
}
?>

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