sql＆amp; php请给出这个错误的解决方案

Question

<?php 
include("includes/connect.php"); 
if(isset($_POST['login'])){ 
$user_name = $_POST['user_name']; 
$user_pass = $_POST['user_pass'];  
$login_query = "SELECT * all from admin_login where user_name='$user_name' AND user_password='$user_pass' ";  
$run = mysql_query($login_query);  
if(mysql_num_rows($run)>0){     
$_SESSION['user_name']=$user_name;  
echo "<script>window.open('index.php','_self')</script>";  
} else {  
echo "<script>alert('User Name or Password is incorrect!')</script>";    } }    ?>

此错误显示

  

警告：mysql_num_rows（）需要参数1   是资源，布尔值在C：\ wamp \ www \ malala \ admin \ login.php中给出   第8行

Answer 1

您必须先设置连接（mysql_connect（＆＃34; loclahost＆＃34;，＆＃34; root＆＃34;，＆＃34;＆＃34;，＆＃34; db_name）） 在mysql_query中你需要2个参数1连接和2个查询。 错误意味着函数无法找到任何行。

Answer 2

您的查询必须如下：

$login_query = "SELECT * from admin_login where user_name='$user_name' AND user_password='$user_pass' ";