[英]PHP script to check If user already exists in MySQL database
I'm creating simple game for Facebook. 我正在为Facebook创建简单的游戏。 All users who used app are written to database.
使用该应用程序的所有用户都将写入数据库。 I need always check If user already exists Is in database, how to do that correctly?
我需要经常检查用户是否已经存在于数据库中,该如何正确执行?
So I have variable $name = $user_profile['name'];
所以我有变量
$name = $user_profile['name'];
It successfully returns user's name 成功返回用户名
And this is my part of code to check If user already exists in database. 这是我检查用户是否已存在于数据库中的代码部分。
$user_profile = $facebook->api('/me');
$name = $user_profile['name'];
$mysqli = new mysqli("host","asd","pw","asdf");
echo "1";
$sql = "SELECT COUNT(*) AS num FROM myTable WHERE userName = ?";
echo "2";
if ($stmt = $mysqli->prepare($sql)) {
echo "3";
$stmt->bind_param('s', $name);
echo "4";
$stmt->execute();
echo "5";
$results = $stmt->get_result();
echo "6";
$data = mysqli_fetch_assoc($results);
echo "7";
}
if($data['num'] != 0)
{
echo "bad";
print "user already exists\n";
} else {
echo "good";
$apiResponse = $facebook->api('/me/feed', 'POST', $post_data);
print "No user in database\n";
}
}
This code not working, It should post data on user's wall If user not exists in database. 此代码不起作用,如果用户不存在于数据库中,则应将数据发布到用户的墙上。 I spent many time to find reason why, but unsuccessfully.
我花了很多时间来找到原因,但是没有成功。 After debugging It don't show any errors.
调试之后它不会显示任何错误。 To find which line is incorrect after every line I used
echo "number"
so now I know which line is incorrect. 为了在每行我使用
echo "number"
之后找到不正确的行,所以现在我知道哪一行是不正确的。 It prints 1 2 3 4 5
and stucks. 打印
1 2 3 4 5
和卡纸。 (everything what are below the code not loading.) So that means this line $results = $stmt->get_result();
(代码下面的所有内容都不会加载。)所以这意味着这行
$results = $stmt->get_result();
is incorrect. 是不正确的。 But I misunderstood what's wrong with this line?
但是我误解了这条线是怎么回事?
If I comment this line all code loading (then print 1 2 3 4 5 6 7 No user in database!
and It post data
on user's wall.) but in this case program always do the same, not checking database. 如果我在这行中注释所有代码加载(然后打印
1 2 3 4 5 6 7 No user in database!
并且它将post data
到用户的墙上。),但是在这种情况下,程序始终会执行相同操作,而不检查数据库。
Also I've tried to change COUNT(*)
to COUNT(userName)
, but the same. 我也尝试将
COUNT(*)
更改为COUNT(userName)
,但是相同。
So could you help me, please? 那你能帮我吗?
I've read this: Best way to check for existing user in mySQL database? 我读过这里: 检查mySQL数据库中现有用户的最佳方法? but It not helped me.
但这没有帮助我。
Ps In this case i need to use FB username. 附:在这种情况下,我需要使用FB用户名。
Can you try this, $stmt->fetch()
instead of mysqli_fetch_assoc($results)
您可以尝试使用
$stmt->fetch()
代替mysqli_fetch_assoc($results)
$mysqli = new mysqli("host","asd","pw","asdf");
echo "1";
/* Create the prepared statement */
$stmt = $mysqli->prepare("SELECT COUNT(*) AS num FROM myTable WHERE userName = ?") or die("Prepared Statement Error: %s\n". $mysqli->error);
/* Execute the prepared Statement */
$stmt->execute();
/* Bind results to variables */
$stmt->bind_result($name);
$data = $stmt->fetch();
if($data['num'] > 0)
{
echo "bad";
print "user already exists\n";
} else {
echo "good";
$apiResponse = $facebook->api('/me/feed', 'POST', $post_data);
print "No user in database\n";
}
/* Close the statement */
$stmt->close();
Ref: http://forum.codecall.net/topic/44392-php-5-mysqli-prepared-statements/ 参考: http : //forum.codecall.net/topic/44392-php-5-mysqli-prepared-statements/
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.