避免重複條目

Question

我有一個註冊表單的php代碼，它將詳細信息存儲到一個表（temp_members_db），然後將確認代碼發送到輸入的電子郵件。如果點擊代碼，temp_members_db的詳細信息將被傳輸到新表registered_members，如果用戶登錄，將從中檢查登錄詳細信息。

問題與註冊碼有關，我如何避免郵件重複和用戶名？ 我的代碼是：

<?php 

include('config.php'); 

$tbl_name=temp_members_db; 

$confirm_code=md5(uniqid(rand())); 

$name=$_POST['name']; 
$email=$_POST['email']; 
$password=$_POST['password']; 
$password_confirm=$_POST['password_confirm']; 

$sql="INSERT INTO $tbl_name(confirm_code, name, email, password)VALUES('$confirm_code', '$name', '$email', '$password')"; 
$result=mysql_query($sql); 

if 
($password != $password_confirm) 
{ 
echo "Password do not match"; 
} 
else if 
($result) 
{ 

$to=$email; 

$subject="Your confirmation link here"; 

$header="from: Name <confirm@domain.org>"; 

$message="Your Comfirmation link \r\n"; 
$message.="Click on this link to activate your account \r\n"; 
$message.="http://mydomain@domain.org/confirmation.php?passkey=$confirm_code"; 

$sentmail = mail($to,$subject,$message,$header); 

} 

else { 
echo "Email not found"; 
} 

if($sentmail){ 
echo "Your Confirmation link Has Been Sent To Your Email Address."; 
} 
else { 
echo "<BR/>Cannot send Confirmation link to your e-mail address"; 
} 

?> 

感謝：d

Answer 1

運行SQL以確定是否姓名或電子郵件中的任何表已經存在INSERT進入數據庫之前。 如果查詢返回>0，則可以顯示錯誤消息。

例如，

SELECT COUNT(*) FROM temp_members_db, registered_members WHERE email = $email OR name = $name;