防止在php/mysql中插入重复的行 [英] preventing duplicate row insertion in php/mysql

问题描述

如何防止在php mysql中输入重复记录?在插入表之前先验证输入.

how do you prevent the entry of duplicate records in php mysql? validating input before insertion to the table.

我目前正在为我的网站建立一个用户注册部分，但是如果在数据库中找到重复的用户名或电子邮件地址，我想向他们显示一个错误.

i am currently building a user registration section for my website but want to present them with an error if a duplicate username or email address is found in the database.

编辑
这是我到目前为止要插入的行...在这里如何实现这两个答案:

EDIT
This is what I have to far to insert rows... how would I implement both these answers here:

  <?php
        if (array_key_exists('confirm',$_POST)) {

                $Cuser = $_POST['Cuser']; 
                $Cemail = $_POST['Cemail']; 
                $Cpassword = $_POST['Cpassword'];
                $md5password = md5($_POST['Cpassword']);

                mysql_query("INSERT INTO tbl_users (`username`,`email`,`password`)
VALUES ('$Cuser', '$Cemail', '$md5password')"); 

                echo "Thank you. The user <b>".$Cuser."&nbsp;(".$Cemail.")</b> has been successfully added to the database.<p>

                <a href='myaccount.php' class='form'>Return</a>";       

                exit;
        }
        ?>

我猜想我可以在if ... else语句中实现所有功能吗?

I'm guessing that I could implement it all in an if...else statement?

推荐答案

我使用了sql语句和if else语句.

i used the sql statement along with an if else statement.

mysql_select_db($database_speedycms, $speedycms);
$query_usercheck = "SELECT * FROM tbl_users WHERE username='$user' OR email='$email'";
$usercheck = mysql_query($query_usercheck, $speedycms) or die(mysql_error());
$row_usercheck = mysql_fetch_assoc($usercheck);
$totalRows_usercheck = mysql_num_rows($usercheck);

然后

if ( $totalRows_usercheck > 0 )

显示一条错误消息，以防止添加任何重复内容

display an error message to prevent any duplicates from being added

否则允许数据库插入

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