Compzone.Org :: Podręcznik PHP :: ifx_affected_rows

Podręcznik PHP
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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 ( resource 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.

Przykład 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");


                }
?>