使用PHP从MySQL数据库获取价值 [英] get value from MySQL database with PHP

问题描述

$from = $_POST['from'];
$to = $_POST['to'];
$message = $_POST['message'];

$query  = "SELECT * FROM Users WHERE `user_name` = '$from' LIMIT 1";
$result = mysql_query($query);
while($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
    $fromID = $row['user_id'];
} 

我尝试让$ formID成为我的用户的user_id数据库。 Users表中的每一行如下：

I'm trying to have $formID be the user_id for a user in my database. Each row in the Users table is like:

user_id | user_name | user_type
   1    |  Hristo   |   Agent

所以我想要 $ from = 1 但上面的代码不工作。

So I want $from = 1 but the above code isn't working. Any ideas why?

推荐答案

尝试：

$from = mysql_real_escape_string($_POST['from']);
$to = mysql_real_escape_string($_POST['to']);
$message = mysql_real_escape_string($_POST['message']);

$query  = "SELECT * FROM Users WHERE user_name = '$from' LIMIT 1";
$result = mysql_query($query) or die(mysql_error());

while($row = mysql_fetch_assoc($result)) {
    $fromID = $row['user_id'];
}

此外，请确保：

• 您已连接到数据库


• 您从帖子获取数据，请尝试 var_dump 与您的vars var_dump（$ from）

• You have connected to the database
• You do get data from the post, try var_dump with your vars eg var_dump($from)

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