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Dieses Dokument verwendet PHP-Handbuch für chinesische Websites Freigeben
(PHP 4, PHP <=5.2.0)
ifx_affected_rows — Get number of rows affected by a query
$result_id
)
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.
result_id
A valid result id returned by ifx_query() or ifx_prepare() .
Returns the number of rows as an integer.
Example #1 Informix affected rows
<?php
$rid = ifx_prepare ( "select * from emp
where name like " . $name , $connid );
if (! $rid ) {
}
$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" );
}
?>