[英]MySql doesn't return anything
我只是在用PHP和MySql來學習東西……直到現在一切都很好,但是現在我找不到任何解決方案。 該基礎是一個非常簡單的登錄系統。 現在,我試圖從名為“ login”的數據庫中讀取用戶名和密碼,該數據庫具有表“ userTBL”以及字段“ username”和“ password”。
<?php
session_start();
mysql_connect ('localhost', 'root', 'root') or die('NO MYSQL CONNECTION!');
mysql_select_db('login');
if ($_GET['login']) {
$username = ($_POST['username']);
$password = ($_POST['password']);
$tmp = mysql_query("SELECT * FROM `user`");
$data = mysql_fetch_array($tmp);
if($tmp) {
echo 'FULL<br />';
} else {
echo 'EMPTY<br />';
}
$_SESSION['username'] = $data['username'];
$_SESSION['password'] = $data['password'];
if ($username == $_SESSION['username'] && $password == $_SESSION['password']) {
$_SESSION['loggedin'] = true;
header("Location: protected.php");
exit;
} else echo "Wrong details!<br />";
}
if ($_SESSION['loggedin'] == true) {
header("Location: protected.php");
}
?>
看來數據庫不會返回任何內容,但是為什么呢?
謝謝你的幫助!
您提到您的表名為“ userTBL”,但您正在查詢表“ user”。 將查詢更改為:$ tmp = mysql_query(“ SELECT * FROM userTBL
WHERE username = {$ username} AND password = {$ password}”); “ WHERE”子句將確保查詢僅返回與鍵入表單的用戶名和密碼匹配的數據。
<?php
session_start();
mysql_connect ('localhost', 'root', 'root') or die('NO MYSQL CONNECTION!');
mysql_select_db('login');
if ($_GET['login']) {
$username = htmlspecialchars($_POST['username']);
$password = htmlspecialchars($_POST['password']);
$tmp = mysql_query('SELECT * FROM `userTBL` WHERE `user` = "'.$username.'"');
while ($data = mysql_fetch_array($tmp))
{
$_SESSION['username'] = $username;
$_SESSION['password'] = $data['password'];
if ($password == $_SESSION['password']) {
$_SESSION['loggedin'] = true;
header("Location: protected.php");
exit;
} else echo "Wrong details!<br />";
}
}
if ($_SESSION['loggedin'] == true) {
header("Location: protected.php");
}
?>
另外:使用salt + hash將密碼存儲在數據庫中。
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