Informix 函数
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ifx_num_rows

(PHP 4, PHP <=5.2.0)

ifx_num_rows — Count the rows already fetched from a query

说明

int ifx_num_rows ( resource $result_id )

Gives the number of rows fetched so far for a query with result_id after a ifx_query() or ifx_do() query.

参数

result_id

result_id is a valid resultid returned by ifx_query() or ifx_prepare() (select type queries only!).

返回值

Returns the number of fetched rows or FALSE on errors.

参见

Informix 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Count the rows already fetched from a query

用户评论:

evandrosimenes at hotmail dot com (13-Jan-2009 12:10)

if you use this function following:

<?php
$query = ifx_query("SELECT * FROM systables", $connection);
$rows  = ifx_num_rows($query);
?>

this way it doesn't work...

the correct is:

<?php
$query = ifx_query("SELECT * FROM systables", $connection);
$fetch = ifx_fetch_row($query);
$rows  = ifx_num_rows($query);
?>

this way it work...

the informix doesn't returns anything (only with ifx_num_rows) if you don't open the results of query (with ifx_fetch_row)

icespawn11882 at hotmail dot com (20-Apr-2005 11:56)

This function give always 0 as result so I used ifx_affected_rows to count rows of a query's result...

An example of this function:

$conn_id = ifx_connect("db", "user", "password");
$res_id = ifx_query("select * from systables", $conn_id);
$res = ifx_affected_rows($res_id);
echo $res;

$res contains the number of rows in the result of the query after his execution.

Para Massimiliano