Question

我无法弄清楚为什么我在process.php页面上出现此错误：

Connected successfully
Could not run query: Table 'members_db.members where 'email' = '123456789'' doesn't exist 
Invalid query: Duplicate entry '123456789' for key 'email'

没有多大意义，因为它似乎在错误信息中自相矛盾。

这是我的process.php：

<?php
session_start();
$con = mysql_connect('localhost', 'root', ''); 
if (!$con) { 
    die('Could not connect: ' . mysql_error()); 
} 
echo 'Connected successfully<br />'; 

// make members the current db
$db_selected = mysql_select_db('members_db', $con);
if (!$db_selected) {
    die ('Can\'t use members database : ' . mysql_error());
}
$hash_password = md5($_POST['password']);

$email = $_POST['email'];

$result = mysql_query("SELECT email,password FROM `members WHERE 'email' = '$email'");
if (!$result) {
    echo 'Could not run query: ' . mysql_error();
    $query = "INSERT INTO members (email, password)
    VALUES('".$_POST['email']."','".$hash_password."')";

    // Perform Query
    $result2 = mysql_query($query);

    // Check result
    // This shows the actual query sent to MySQL, and the error. Useful for debugging.
    if (!$result2) {
        $message  = 'Invalid query: ' . mysql_error() . "\n";
        //$message .= 'Whole query: ' . $query;
        die($message);
    }   
$_SESSION['email']=$_POST['email'];
$_SESSION['password']=$hash_password;
$_SESSION['loggedin']="YES";
$url = "Location: /welcome.php";
header($url);
}
$_SESSION['email']=$_POST['email'];
$_SESSION['password']=$hash_password;
$url = "Location: /checklogin.php";
header($url);
?>

这可能是一个愚蠢的错误，因为我正在学习这个项目。谢谢你的帮助！

Answer 1

"SELECT email,password FROM `members WHERE 'email' = '$email'"

"SELECT email,password FROM `members` WHERE 'email' = '$email'"

你错过了反击=＆gt; `

Answer 2

更改

 "SELECT email,password FROM `members WHERE 'email' = '$email'"

到

"SELECT email,password FROM `members` WHERE 'email' = '$email'"

Answer 3

对于第一个错误：

更改第一个查询

$result = mysql_query("SELECT email,password FROM `members WHERE 'email' = '$email'");

到

$result = mysql_query("SELECT email,password FROM `members` WHERE email = '$email'");

第二个错误：

“重复条目”是因为您已经有一封包含相同数据的电子邮件，并且您的“电子邮件”列是唯一的，只需删除电子邮箱= 123456789的成员行。

PHP / MySql错误：字段不存在，但它确实存在

3 个答案: