使用准备好的语句的PHP更新查询不起作用
[英]php update query using prepared statement not working
问题描述
I am doing updation of table using following prepared statements as follows: 
我正在使用以下准备的语句来更新表：
$query = " UPDATE signup SET name=?,password=?,verify_key=? WHERE email=? ";
$stmt=$conn->prepare($query);
$stmt->bind_param("ssss",$dname,$password,$verify_key,$email);
$stmt->execute();
$stmt->close();
But it is giving error on which I am stuck for long time: 但这给了我长期困扰的错误：
Fatal error: Call to a member function bind_param() on boolean in somefile.php on line 75
Structure of table in database is as follow: 数据库中表的结构如下：
mysql> desc signup;
+------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+----------------+
| sid | int(11) | NO | PRI | NULL | auto_increment |
| name | varchar(100) | NO | | NULL | |
| email | varchar(100) | NO | UNI | NULL | |
| password | varchar(255) | NO | | NULL | |
| verify_key | varchar(255) | NO | | NULL | |
| active | bit(1) | NO | | NULL | |
+------------+--------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)
Note : I printed $dname,$password,$verify_key,$email. 注意：我打印了$ dname，$ password，$ verify_key，$ email。 All printed correct string values. 所有打印的正确字符串值。
Entire PHP code: 整个PHP代码：
<?php
session_start();
ob_start();
require_once("connection.php");
$dname=$_POST['dname'];
$email=$_POST['email'];
$password=$_POST['password'];
if(empty($dname) || empty($email) || empty($password))
die("Enter correct details.");
$password = password_hash($password,PASSWORD_DEFAULT); // generate hash for password
$verify_key = password_hash(RandomString(),PASSWORD_DEFAULT); // generate hash for verification key
/* RandomString() generates random string */
function RandomString($length = 32) {
$randstr;
//our array add all letters and numbers if you wish
$chars = array(
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'p',
'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');
for ($rand = 0; $rand <= $length; $rand++) {
$random = rand(0, count($chars) - 1);
$randstr .= $chars[$random];
}
return $randstr;
} // function RandomString() over
/* Mail Sending Code */
function sendMail($email,$verify_key){
$to = $email;
$subject = 'Something';
$mail_link='https://127.0.0.1/rs/signupCheck.php?email='.$email.'&key='.$verify_key;
$message = "
<html>
<head>
<title></title>
</head>
<body>
<p>
<a href='> Click this link to verify your account </a>
</p>
</body>
</html>
";
// To send HTML mail, the Content-type header must be set
$headers[] = 'MIME-Version: 1.0';
$headers[] = 'Content-type: text/html; charset=iso-8859-1';
$headers[] = 'From: Something <Something>';
$res = mail($to, $subject, $message, implode("\r\n", $headers));
return $res; //check officially mail is sent or not
} // function sendMain() ends
// check if email already exists in database
$query = " SELECT active FROM signup WHERE email=?";
$stmt = $conn->prepare($query);
$stmt->bind_param("s",$email);
$stmt->execute();
$stmt->bind_result($dbactive);
if($stmt->fetch()){ // email is present in DB
if($dbactive==1){ // status=1
$stmt->close();
die("Account already created. Try forget passwod if you can't access it.");
}
else{
/* Record is already present with status=0 , override all the details */
if(sendMail($email,$verify_key)) { // send mail first then update DB
$query = " UPDATE `signup` SET `name`=?,`password`=?,`verify_key`=? WHERE `email`=? ";
$stmt=$conn->prepare($query);
$stmt->bind_param("ssss",$dname,$password,$verify_key,$email);
$stmt->execute();
$stmt->close();
die("We sent you verification link on mail. Click it to verify !!!");
}
else {
die("Mail sending failed. Try again !!!");
}
}
} // email already present with either status=1 or status=0
else { // Insert account details in DB , nothing is present in DB for user
if(sendMail($email,$verify_key)) { // send mail first then update DB
$query = "INSERT INTO signup (sid,name,email,password,verify_key,active)VALUES(?,?,?,?,?,?)";
$stmt = $conn->prepare($query);
$stmt->bind_param("issssi",$fixed_sid='',$dname,$email,$password,$verify_key,$fixed_active=0);
/* Notice $fixed_sid and $fixed_active , it is needed
you can't have fixed values in bind_param
*/
$stmt->execute();
$stmt->close();
die("We sent you verification link on mail. Click it to verify !!!");
}
else {
die("Mail sending failed. Try again !!!");
}
} // first time data entry in DB
?>
2 个解决方案
解决方案1
3 已采纳 2017-04-09 18:21:17
Add $stmt->close(); 添加$stmt->close(); before your next mysqli interaction. 在您下一次mysqli交互之前。
if(sendMail($email,$verify_key)) { // send mail first then update DB
$stmt->close();
$query = " UPDATE `signup` SET `name`=?,`password`=?,`verify_key`=? WHERE `email`=? ";
or you might just always want to execute the close after you're finished with your previous mysql interaction. 或者您可能总是希望在完成之前的mysql交互后执行close 。
eg: 例如：
$query = " SELECT active FROM signup WHERE email=?";
$stmt = $conn->prepare($query);
$stmt->bind_param("s",$email);
$stmt->execute();
$stmt->bind_result($dbactive);
$stmt->close();
and remove the $stmt->close(); 并删除$stmt->close(); from the if . 从if 。 I've never seen official documentation on this but I've seen other threads were this was an underlying issue. 我从没看过官方文档，但是我看过其他线程，这是一个潜在的问题。 The manual page itself actual almost states the opposite: 手册页实际上几乎是相反的：
So, while explicitly closing open connections and freeing result sets is optional , doing so is recommended.
that is optional is false (... in my experience, I also primarily use PDO). 那is optional是错误的（...根据我的经验，我也主要使用PDO）。
解决方案2
1 2018-03-13 09:13:14
I had an issue in my query and this line of code help me to diagnose my error 我的查询出现问题，这行代码可帮助我诊断错误
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
here is reference may be it help you 这是参考可能对您有帮助
https://websitebeaver.com/prepared-statements-in-php-mysqli-to-prevent-sql-injection https://websitebeaver.com/prepared-statements-in-php-mysqli-to-prevent-sql-injection
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