PHP PDO：无法在php中连接数据库

Question

我有两个名为dblogin的数据库，其中存储了所有注册详细信息以及表单（用户主页上）的详细信息所在的其他信息。现在我正在使用会话在dblogin中显示与用户相关的数据，但是如何显示用户使用会话ID在主页上填充的数据？ 希望根据用户会话ID在view.php上按用户查看home.php上的表单详细信息。

class.user.php

<?php 
require_once('dbconfig.php');`` 
class USER 
{ 
private $conn; 
public function __construct() 
{ 
$database = new Database(); 
$db = $database->dbConnection(); 
$this->conn = $db; 
} 
public function runQuery($sql) 
{ 
$stmt = $this->conn->prepare($sql); 
return $stmt; 
} 
public function register($uname,$umail,$upass) 
{ 
try 
{ 
$new_password = password_hash($upass, PASSWORD_DEFAULT); 
$stmt = $this->conn->prepare("INSERT INTO users(user_name,user_email,user_pass)VALUES(:uname, :umail, :upass)");         
$stmt->bindparam(":uname", $uname); 
$stmt->bindparam(":umail", $umail); 
$stmt->bindparam(":upass", $new_password); 
$stmt->execute(); 
return $stmt; 
} 
catch(PDOException $e) 
{ 
echo $e->getMessage(); 
}    
} 
public function doLogin($uname,$umail,$upass) 
{ 
try 
{ 
$stmt = $this->conn->prepare("SELECT user_id, user_name, user_email, user_pass FROM users WHERE user_name=:uname OR user_email=:umail "); 
$stmt->execute(array(':uname'=>$uname, ':umail'=>$umail)); 
$userRow=$stmt->fetch(PDO::FETCH_ASSOC); 
if($stmt->rowCount() == 1) 
{ 
if(password_verify($upass, $userRow['user_pass'])) 
{ 
$_SESSION['user_session'] = $userRow['user_id']; 
return true; 
} 
else 
{ 
return false; 
} 
} 
} 
catch(PDOException $e) 
{ 
echo $e->getMessage(); 
} 
} 
public function is_loggedin() 
{ 
if(isset($_SESSION['user_session'])) 
{ 
return true; 
} 
} 
public function redirect($url) 
{ 
header("Location: $url"); 
} 
public function doLogout() 
{ 
session_destroy(); 
unset($_SESSION['user_session']); 
return true; 
} 
} 
?> 

dbconfig.php

<?php 
class Database 
{ 
private $host = "localhost"; 
private $db_name = "dblogin"; 
private $username = "root"; 
private $password = ""; 
public $conn; 
public function dbConnection() 
{ 
$this->conn = null;  
try 
{ 
$this->conn = new PDO("mysql:host=" . $this->host . ";dbname=" . $this->db_name, $this->username, $this->password); 
$this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
} 
catch(PDOException $exception) 
{ 
echo "Connection error: " . $exception->getMessage(); 
} 
return $this->conn; 
} 
} 
?> 

home.php

<?php 
require_once("session.php"); 
require_once("class.user.php"); 
$auth_user = new USER(); 
$user_id = $_SESSION['user_session']; 
$stmt = $auth_user->runQuery("SELECT * FROM users WHERE user_id=:user_id"); 
$stmt->execute(array(":user_id"=>$user_id)); 
$userRow=$stmt->fetch(PDO::FETCH_ASSOC); 
?> 
<nav class="navbar navbar-default navbar-fixed-top"> 
<div class="container"> 
<div class="navbar-header"> 
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> 
<span class="sr-only">Toggle navigation</span> 
<span class="icon-bar"></span> 
<span class="icon-bar"></span> 
<span class="icon-bar"></span> 
</button> 
</div> 
<div id="navbar" class="navbar-collapse collapse"> 
<ul class="nav navbar-nav navbar-right"> 
<li class="dropdown"> 
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> 
<span class="glyphicon glyphicon-user"></span>&nbsp;Hi' <?php echo $userRow['user_name']; ?>&nbsp;<span class="caret"></span></a> 
<ul class="dropdown-menu"> 
<li><a href="profile.php"><span class="glyphicon glyphicon-user"></span>&nbsp;View Profile</a></li> 
<li><a href="logout.php?logout=true"><span class="glyphicon glyphicon-log-out"></span>&nbsp;Sign Out</a></li> 
</ul> 
</li> 
</ul> 
</div><!--/.nav-collapse --> 
</div> 
</nav> 
<div class="clearfix"></div> 
<div class="container-fluid" style="margin-top:80px;"> 
<div class="container"> 
<label class="h5">welcome : <?php print($userRow['user_name']); ?></label> 
<h1> 
<a href="home.php"><span class="glyphicon glyphicon-home"></span> home</a> &nbsp; 
<a href="profile.php"><span class="glyphicon glyphicon-user"></span> profile</a></h1> 
<hr /> 
<div class="navbar-header"> 
<a class="navbar-brand" href="#">The-Echeck</a> 
</div> 
<ul class="nav navbar-nav"> 
<li class="active"><a href="home.php">Home</a></li> 
<li><a href="view.php">View/Print Check</a></li> 
<li><a href="#">Export as CSV</a></li> 
</ul> 
<form action="insert.php" method="post"> 
<p id="emp"><input type="text" name="e_name" id="e_name" placeholder="Payee Name" required style='text-transform:uppercase'></p> 
<p><input type="text" name="check_no" id="check_no" placeholder="Check Number" required style='text-transform:uppercase'></p> 
<p><input type="text" name="amount" id="amount" placeholder="Amount" required style='text-transform:uppercase'></p> 
<!--<p><input type="text" name="amu" id="amu" placeholder="Amount In Words" required></p>--> 
<p><input type="text" name="routing" id="routing" placeholder="Routing #" required style='text-transform:uppercase'></p> 
<p><input type="text" name="ch_acc" id="ch_acc" placeholder="Checking Account #" required style='text-transform:uppercase'></p> 
<p><input type="text" name="con_acc" id="con_acc" placeholder="Confirm Account #" required style='text-transform:uppercase'> </p> 
<p><input type="Date" name="date" id="date" placeholder="Date" required style='text-transform:uppercase'></p> 
<p><input type="text" name="p_name" id="p_name" placeholder="Payor Name" required style='text-transform:uppercase'></p>  
<p><input type="text" name="addr" id="addr" placeholder="Address" required style='text-transform:uppercase'></p> 
<p><input type="text" name="city" id="city" placeholder="City" required style='text-transform:uppercase'></p> 
<p><input type="text" name="state" id="state" placeholder="State" required style='text-transform:uppercase'></p> 
<p><input type="text" name="zip" id="zip" placeholder="Zip" required style='text-transform:uppercase'></p> 
<p><input type="text" name="phone" id="phone" placeholder="Phone" required style='text-transform:uppercase'></p> 
<p><input type="text" name="memo1" id="memo1" placeholder="Memo1" required</p> 
<p><input type="text" name="memo2" id="memo2" placeholder="Memo2" required</p> 
<input type="submit" Value="Submit" name="submit" id="submit"> 
</form> 
</div> 

view.php

<?php 
require_once("session.php"); 
require_once("db_details.php"); 
require_once("class.user.php"); 
$auth_user = new USER(); 
$user_id = $_SESSION['user_session']; 
$stmt = $auth_user->runQuery("SELECT * FROM users WHERE user_id=:user_id"); 
$stmt->execute(array(":user_id"=>$user_id)); 
$userRow=$stmt->fetch(PDO::FETCH_ASSOC); 
?> 
<nav class="navbar navbar-default navbar-fixed-top"> 
<div class="container"> 
<div class="navbar-header"> 
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> 
<span class="sr-only">Toggle navigation</span> 
<span class="icon-bar"></span> 
<span class="icon-bar"></span> 
<span class="icon-bar"></span> 
</button> 
</div> 
<div id="navbar" class="navbar-collapse collapse"> 
<ul class="nav navbar-nav navbar-right"> 
<li class="dropdown"> 
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> 
<span class="glyphicon glyphicon-user"></span>&nbsp;Hi <?php echo $userRow['user_name']; ?>&nbsp;<span class="caret"></span></a> 
<ul class="dropdown-menu"> 
<li><a href="profile.php"><span class="glyphicon glyphicon-user"></span>&nbsp;View Profile</a></li> 
<li><a href="logout.php?logout=true"><span class="glyphicon glyphicon-log-out"></span>&nbsp;Sign Out</a></li> 
</ul> 
</li> 
</ul> 
</div><!--/.nav-collapse --> 
</div> 
</nav> 
<div class="clearfix"></div>  
<div class="container-fluid" style="margin-top:80px;"> 
<div class="container"> 
<label class="h5">welcome : <?php print($userRow['user_name']); ?></label> 
<div class="navbar-header"> 
<a class="navbar-brand" href="#">The-Echeck</a> 
</div> 
<ul class="nav navbar-nav"> 
<li class="active"><a href="home.php">Home</a></li> 
<li><a href="view.php">View/Print Check</a></li> 
<li><a href="#">Export as CSV</a></li> 
</ul> 
<br> 
<br> 
<br> 
<?php 
$query="SELECT * FROM details WHERE"; 
try 
{ 
$stmt = $db->prepare($query); 
$stmt->execute(); 
} 
catch(PDOException $ex) 
{ 
die("Failed to run query: " . $ex->getMessage()); 
} 
$rows = $stmt->fetchAll(); 
?> 
<h1>Memberlist</h1> 
<table border='1'> 
<tr> 
<th>Date</th> 
<th>Name</th> 
<th>Amount</th> 
</tr> 
<?php foreach($rows as $row): ?> 
<tr> 
<td><?php echo htmlentities($row['date'], ENT_QUOTES, 'UTF-8'); ?></td> 
<td><?php echo htmlentities($row['name'], ENT_QUOTES, 'UTF-8'); ?></td> 
<td><?php echo htmlentities($row['amount'], ENT_QUOTES, 'UTF-8'); ?></td>   
</tr> 
<?php endforeach; ?> 

db_details.php

<?php 

// These variables define the connection information for your MySQL database 
$username = "root"; 
$password = ""; 
$host = "localhost"; 
$dbname = "echeck"; 

$options = array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'); 
try 
{ 
$db = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $username, $password, $options); 
} 
catch(PDOException $ex) 
{ 
die("Failed to connect to the database: " . $ex->getMessage()); 
} 
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
$db->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); 
?> 

Answer 1

创建这个PHP文件登录期间验证用户身份。我把它叫做validate.php

<?php 
// Start the session 
session_start(); 
?> 

<?php 
include('config.php');//this is the database connection 
{ 
$username=$_POST['username'];//values picked from login form 
$password=$_POST['password'];//values picked from login form 

} 
$sql = "SELECT * FROM users_tbl WHERE username ='$name' AND password='$password'"; 
$result = mysqli_query($con,$sql); 
$row = mysqli_num_rows($result); 
if($row==1) 

{ 
    $_SESSION["username"] = "$session_id"; 
    header("location:homepage.php"); 
} 
else{ 
    echo "Either your password is wrong or username. Please Try again</br>"; 
} 
?> 

登录后是succesfull在homepage.html试试这个

<?php 
session_start(); 
if (isset($_SESSION['username'])) { 
    $session_id=$_SESSION["username"]; 
} 
?> 

<html> 
<body> 
<?php 
include(config.php);//database connection 
$session_id=$_SESSION["username"]; // we pick the value stored in our session 

$sql = "SELECT * FROM users_tbl WHERE username='$session_id'"; 
$result = $conn->query($sql); 

if ($result->num_rows > 0) { 

    // output data of each row 
    while($row = $result->fetch_assoc()) { 
     echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>"; 
    } 
} else { 
    echo "Something went wrong"; 
} 
$con->close(); 
?> 

</body> 
</html> 

数据库连接config.php

<?php 
$host='localhost'; 
$user='root'; 
$pass=''; 
$db='vet';//database name 
$con= mysqli_connect($host,$user,$pass,$db); 
if (!$con) { 
die("Connection failed: " . mysqli_connect_error()); 
} 
?>