Question

我正在尝试使用以下代码将我的数据库连接到我的PHP代码：

<html>

    <head>
    <title>Landing page</title>
    <link rel="stylesheet" type="text/css" href="css.css">
    </head>
    <body>

    <?php

    // Check if username and password are correct
    if ($_POST["username"] == "logintest" && $_POST["password"] == "access123!") {

    // If correct, we set the session to YES
      session_start();
      $_SESSION["logged_in"] = "YES";
      echo "<h1>You are now logged in</h1>";
      echo "<p><a href='secure1.php'>Link to protected file</a></p>";
      echo "<p><a href='secure2.php'>Link to protected file #2</a></p>";

    }
    else {

    // If not correct, we set the session to NO
      session_start();
      $_SESSION["logged_in"] = "NO";
      echo "<h1>You are NOT logged in </h1>";
      echo "<p><a href='secure1.php'>Link to protected file</a></p>";
      echo "<p><a href='secure2.php'>Link to protected file #2</a></p>";

    }

    ?>
    <p><a href="public.html">Public Page</a></p>
    <p><a href="logout.html">Logout</a></p>
    </body>
    </html>

我想使用特定表中的数据库用户名和密码，而不是使用内联用户名和密码。我出于某种原因无法让它工作，我发现它真的很难。如果有人能帮忙的话会很棒。

Answer 1

注意：

您必须首先建立与数据库的连接。替换连接中的必要数据
我使用mysqli_* prepared statement而不是deprecated mysql_*
将您的if ($_POST["username"] == "logintest" && $_POST["password"] == "access123!") {替换为if($checklog > 0 ){

代码：

/* ESTABLISH FIRST YOUR CONNECTION TO YOUR DATABASE */
$con = new mysqli("host", "User", "Password", "Database"); /* REPLACE NECESSARY DATA */

if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

if($stmt = $con->prepare("SELECT Username, Password FROM user_login WHERE Username = ? AND Password = ?")){
  $stmt->bind_param("ss",$_POST["username"],$_POST["password"]);
  $stmt->execute();
  $stmt->store_result();
  $checklog = $stmt->num_rows;

    if($checklog > 0){
      /* HERE IS YOUR CODE WITH SUCCESSFUL LOGIN */
    }
    else {
      /* HERE IS YOUR CODE WITH UNSUCCESSFUL LOGIN */
    }

  $stmt->close();
}

Answer 2

有几种方法可以连接到MySQL。但是，仅仅知道如何连接是不够的。您还需要学习如何使用它。因此，我首先给你一些MySQLi和PDO的链接：

PHP: MySQLi - Manual
PHP: PDO - Manual

现在回答你的问题，这里有一些常用的连接mysql的方法：

MySQLi对象已发布的样式

<?php

$dbhost = ""; //Server Address
$dbname = ""; //Database Name
$dbuser = ""; //Database User
$dbpass = ""; //Database Password

$mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
if ($mysqli->connect_errno){
    echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
}

?>

MySQLi程序风格

<?php

$dbhost = ""; //Server Address
$dbname = ""; //Database Name
$dbuser = ""; //Database User
$dbpass = ""; //Database Password

$mysqli = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname);
if (mysqli_connect_error()){
    echo "Failed to connect to MySQL: (" . mysqli_connect_error() . ")";
}

?>

PDO对象已发布的样式

<?php

$dbhost = ""; //Server Address
$dbname = ""; //Database Name
$dbuser = ""; //Database User
$dbpass = ""; //Database Password

$dsn = 'mysql:host=' . $dbhost . ';dbname=' . $dbname;
$options = array(
    PDO::ATTR_PERSISTENT    => true,
    PDO::ATTR_ERRMODE       => PDO::ERRMODE_EXCEPTION
);
try{
    $pdo = new PDO($dsn, $dbuser, $dbpass, $options);
}
catch(PDOException $e){
    echo $e->getMessage();
}

?>

需要帮助将我的数据库连接到PHP

2 个答案:

注意：