文字
msql_num_rows
(PHP 4, PHP 5)
msql_num_rows — Get number of rows in result
说明
int msql_num_rows
( resource
$query_identifier
)msql_num_rows() returns the number of rows in a result set.
参数
-
result -
resource 型的结果集。此结果集来自对 msql_query() 的调用。
返回值
Returns the number of rows in the result set.
参见
- msql_num_fields() - Get number of fields in result
用户评论:
[#1] dd at hibm dot org [2009-04-21 02:23:57]
If you would like to just find out how many rows are returned by a query without actually using the results, then it's much more efficient to use SQL count function (specially for large tables with millions of rows).
<?php
$sql = "SELECT COUNT(indexed-field) AS cnt FROM some-table";
$r = mysql_query($sql);
$row = mysql_fetch_object($r);
echo $row->cnt;
?>