Question

我正在验证电子邮件是否已经存在但由于此问题而无法执行此操作，我的查询返回false，空查询。请更正我的MySQL查询。

我得到的错误是：

mysql_num_rows期望参数1为资源布尔值

请参阅我的代码

$dup_email_check="SELECT email from users where 'email'='$email'";
$result = mysqli_query($conn,$dup_email_check);
if (mysql_num_rows($result) > 1){
echo "<script>alert('Email Already Exists')</script)";
}
else{
$query = "INSERT INTO users (`user_name`, `First_Name`, `Last_Name`, `Pass`, `Retype-pass`, `email`) VALUES ('$user_name','$first_name','$last_name','$pass','$retype_pass','$email')";
}

Answer 1

这应该是

$dup-email-check

更改为

$dup_email_check

代码是

$dup_email="SELECT email from users where email= '$email'";
$result = mysqli_query($conn,$dup_email);

$count = count($result);
if($count >1){
    echo "<script>alert('Email Already Exists')</script)";
}
else{
    $query = "INSERT INTO users (`user_name`, `First_Name`, `Last_Name`, `Pass`, `Retype-pass`, `email`) VALUES ('$user_name','$first_name','$last_name','$pass','$retype_pass','$email')";
}

Answer 2

您混合了mysql和mysqli

if (mysqli_num_rows($result) > 1){
         ^// this shud be mysqli
echo "<script>alert('Email Already Exists')</script)";
}
else{
...

如何验证MySQL中是否已存在电子邮件？

2 个答案: