- PHP 手册
- 函数参考
- 数据库扩展
- 针对各数据库系统对应的扩展
- mSQL
- mSQL 函数
msql_num_rows
(PHP 4, PHP 5, PHP 7)
msql_num_rows — Get number of rows in result
说明
msql_num_rows ( resource$query_identifier
) : int
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
User Contributed Notes 1 note
up down -13 dd at hibm dot org ¶10 years ago
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;
?>
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官方地址：https://www.php.net/manual/en/function.msql-num-rows.php