检查mysql_query是否返回任何东西 [英] Checking if mysql_query returned anything or not

问题描述

$query = "SELECT * FROM `table`";
$results = mysql_query($query, $connection);

如果表"没有行.什么是最简单的检查方法??

If 'table' has no rows. whats the easiest way to check for this.?

推荐答案

您可以使用 mysql_num_rows($ results)检查是否返回了0行，或使用这种更快的替代方法:

You could use mysql_num_rows($results) to check if 0 rows were returned, or use this faster alternative:

$query = "SELECT COUNT(*) AS total FROM table";
$results = mysql_query($query, $connection);
$values = mysql_fetch_assoc($results);
$num_rows = $values['total'];

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