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PHP5中文手册

ifx_affected_rows

(No version information available, might be only in CVS)

ifx_affected_rows — Get number of rows affected by a query

说明

int ifx_affected_rows ( resource $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.

参数

result_id

A valid result id returned by ifx_query() or ifx_prepare().

返回值

Returns the number of rows as an integer.

范例

Example#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");
}
?>