需要帮助将我的数据库连接到PHP吗_Php_Mysql

需要帮助将我的数据库连接到PHP吗

php mysql

需要帮助将我的数据库连接到PHP吗,php,mysql,Php,Mysql,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 pa

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>


登录页

我希望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。我只是因为某些原因不能让它工作，我发现它真的很难。如果有人能帮忙，那就太好了。

注意：

您必须首先建立到数据库的连接。更换连接内的必要数据
我使用了
```
mysqli.*
```
而不是
```
mysql.*
```

将您的

if（$\u POST[“username”]=“logintest”&&$\u POST[“password”]=“access123！”）{

替换为

if（$checklog>0）{

代码：

有几种连接MySQL的方法。但是，仅仅知道如何连接是不够的。你还需要学习如何使用它。因此，我首先给你几个指向MySQLi和PDO的链接：

现在回答您的问题，这里有一些连接mysql的常用方法：

MySQLi Object Oriëntated风格

<?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;
}

?>

<?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() . ")";
}

?>

<?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();
}

?>

MySQLi程序风格

<?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;
}

?>

<?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() . ")";
}

?>

<?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();
}

?>

PDO对象或关联样式

<?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;
}

?>

<?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() . ")";
}

?>

<?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();
}

?>

你能发布你的代码吗..你的表名是什么？还有它的列？在你的问题中发布你的代码。这大大增加了你得到答案的机会。你可以通过以下方式连接数据库：

$con=mysql\u connect（'host'，'username'，'password'）；$con1=mysql\u select\u db（'db\u name'，$con）

数据库名为user\u login，表名为users，列名为Username和password如果

$con->prepare

失败，您可能还需要添加一些错误代码。有没有办法让页面显示谁已登录？例如，如果他们已登录，它将显示“Welcome[Firstname][Lastname]”？谢谢你的帮助