mysql_fetch_array(): supplied argument is not a valid MySQL result resource解决方法

mysql_fetch_array(): supplied argument is not a valid MySQL result resource
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in D:\myapacheweb\test\self_info.php on line 7

PHP code

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mysql_connect("localhost","root","1"); 
    $query="select id from computer where user ='test2'";
    $result=mysql_query($query);
    
    echo "test2 使用了<br>";
    while($row = mysql_fetch_array($result))
    {
        echo $row['id']."开始时间".$row[starttime]."<br>";
    }

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