错误帮助:警告:mysql_num_rows()期望参数1为资源 [英] Error Help: Warning: mysql_num_rows() expects parameter 1 to be resource

问题描述

我正在构建一个简单的PHP CRUD应用，并且遇到了此错误:

I'm building a simple PHP CRUD app and I'm running into this error:

警告:mysql_num_rows()期望参数1为资源，布尔值输入

Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in

<?php 
$query = "select * from user";
$result = mysql_query($query);

if (mysql_num_rows($result) > 1) {
    echo "<table align='center' border='1'>";
    echo "<tr>";
    echo "<th>Id</th>";
    echo "<th>Username</th>";
    echo "<th>Password</th>";
    echo "</tr>";
    while($row = mysql_fetch_array($result)) {
        echo "<tr>";
        echo "<td>".$row['id']."</td>"; 
        echo "<td>".$row['username']."</td>";   
        echo "<td>".$row['password']."</td>";
        echo "<td><a href='index.php?operation=edit&id=".$row['id']."&username=".$row['username']."&password=".$row['password']."'>edit</a></td>";
        echo "<td><a href='index.php?operation=delete&id=".$row['id']."'>delete</a></td>";  
        echo "</tr>";
    }
    echo "</table>";
} else {
    echo "<center>No Records Found!</center>";  
}
?>

错误指向该代码中的第34行.任何帮助将不胜感激！

The error points to the 34th line in that code. Any help would be greatly appreciated!

推荐答案

通常，这意味着由于字段名不正确等导致查询失败-您确定表存在吗?尝试使用一些错误处理来弄清问题所在.

Usually this means your query failed due to incorrect fieldnames etc - are you sure your table exists? Try using some error handling to give an idea what the issue is.

$result = mysql_query($query) or die('Cannot Execute:'. mysql_error());

这篇关于错误帮助:警告:mysql_num_rows()期望参数1为资源的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！