PHP PDO sqlite3-> fetchAll（）返回NULL

我有下面的代码，我不明白为什么返回NULL。我得到以下输出在我的浏览器：PHP PDO sqlite3-> fetchAll（）返回NULL

string(5) "admin"

array(3) { ["is_admin"]=> NULL ["username"]=> NULL ["password"]=> NULL }

ORM.php

<?php 
    class ORM 
    { 
     private $pdo; 
     private $query; 

     public function __construct() { 
      try { 
       if ($this->pdo == NULL) { 
        $this->pdo = new \PDO('sqlite:' . SQLITE3_FILE); 
       } 
      } catch(\PDOException $e) { 
       die($e); 
      } 

      return $this->pdo; 
     } 

     public function read($query) { 
      try { 
       $this->query = $this->pdo->query($query); 

       $users = []; 

       while ($record = $this->query->fetchAll(\PDO::FETCH_ASSOC)) { 
        $users = [ 
         'is_admin' => $record['is_admin'], 
         'username' => $record['username'], 
         'password' => $record['password'] 
        ]; 
       } 

       return $users; 
      } catch(\PDOException $e) { 
       die($e); 
      } 
     } 
    }

的index.php

<?php 
    require_once('ORM.php'); 

    $pdo = new \ORM(); 

    if (isset($_POST['username'])) { 
     $username = $_POST['username']; 
     $users = $pdo->read('SELECT * FROM users'); 
     var_dump($username); 
     echo('<br>'); 
     var_dump($users); 
     die(); 
    }

编辑：（通过的要求用户）

signin.html

<!doctype html> 
<html class="fixed"> 
    <head> 
     <meta charset="UTF-8"> 
     <title>Signin</title> 
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> 
     <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700,800|Shadows+Into+Light" rel="stylesheet" type="text/css" /> 
     <link rel="stylesheet" href="theme/assets/vendor/bootstrap/css/bootstrap.css" /> 
     <link rel="stylesheet" href="theme/assets/vendor/font-awesome/css/font-awesome.css" /> 
     <link rel="stylesheet" href="theme/assets/vendor/magnific-popup/magnific-popup.css" /> 
     <link rel="stylesheet" href="theme/assets/vendor/bootstrap-datepicker/css/bootstrap-datepicker3.css" /> 
     <link rel="stylesheet" href="theme/assets/stylesheets/theme.css" /> 
     <link rel="stylesheet" href="theme/assets/stylesheets/skins/default.css" /> 
     <link rel="stylesheet" href="theme/assets/stylesheets/theme-custom.css"> 
     <script src="theme/assets/vendor/modernizr/modernizr.js"></script> 
    </head> 
    <body> 
    <section class="body-sign"> 
     <div class="center-sign"> 
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      <div class="panel panel-sign"> 
       <div class="panel-title-sign mt-xl text-right"> 
        <h2 class="title text-uppercase text-weight-bold m-none"><i class="fa fa-user mr-xs"></i> Sign In</h2> 
       </div> 
       <div class="panel-body"> 
        <form action="index.php" method="POST"> 
         <div class="form-group mb-lg"> 
          <label>Username</label> 
          <div class="input-group input-group-icon"> 
           <input name="username" type="text" class="form-control input-lg" /> 
           <span class="input-group-addon"> 
            <span class="icon icon-lg"> 
             <i class="fa fa-user"></i> 
            </span> 
           </span> 
          </div> 
         </div> 
         <div class="form-group mb-lg"> 
          <div class="clearfix"> 
           <label class="pull-left">Password</label> 
           <a href="reset.php" class="pull-right">Lost Password?</a> 
          </div> 
          <div class="input-group input-group-icon"> 
           <input name="pwd" type="password" class="form-control input-lg" /> 
           <span class="input-group-addon"> 
            <span class="icon icon-lg"> 
             <i class="fa fa-lock"></i> 
            </span> 
           </span> 
          </div> 
         </div> 
         <div class="row"> 
          <div class="col-sm-8"> 
           <div class="checkbox-custom checkbox-default"> 
            <input id="RememberMe" name="rememberme" type="checkbox"/> 
            <label for="RememberMe">Remember Me</label> 
           </div> 
          </div> 
          <div class="col-sm-4 text-right"> 
           <button type="submit" class="btn btn-primary hidden-xs">Sign In</button> 
           <button type="submit" class="btn btn-primary btn-block btn-lg visible-xs mt-lg">Sign In</button> 
          </div> 
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        </form> 
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    </section 
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    <script src="theme/assets/vendor/jquery-browser-mobile/jquery.browser.mobile.js"></script> 
    <script src="theme/assets/vendor/bootstrap/js/bootstrap.js"></script> 
    <script src="theme/assets/vendor/nanoscroller/nanoscroller.js"></script> 
    <script src="theme/assets/vendor/bootstrap-datepicker/js/bootstrap-datepicker.js"></script> 
    <script src="theme/assets/vendor/magnific-popup/jquery.magnific-popup.js"></script> 
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    <script src="theme/assets/javascripts/theme.js"></script> 
    <script src="theme/assets/javascripts/theme.custom.js"></script> 
    <script src="theme/assets/javascripts/theme.init.js"></script> 
    </body> 
</html>

来源

2016-11-19 Aiden Pearce

我学会了不要被__construct返回，不知道这是否能解决你的问题。 –

@Igor Unger：我仍然得到相同的结果 –

在你的代码$record是数组的数组，所以为了你需要做这样的事情了返回的数据集的每一行迭代：

public function read($query) { 
     try { 
      $this->query = $this->pdo->query($query); 

      $users = []; 
      $records = $this->query->fetchAll(\PDO::FETCH_ASSOC); 


       foreach($records as $record) 
       { 
        //add users here using $record['is_admin']...      
       } 

      return $users; 
     } catch(\PDOException $e) { 
      die($e); 
     } 
    }

来源

2016-11-19 20:57:57 Khaled

通过自己推荐的更改，我得到从数据库返回的最后一行，而不受$ _POST ['username']限制 –

通过将SQL语句更改为以下产生的结果如下所示：“SELECT * FROM'users' WHERE username LIKE'$ username'” –

PHP PDO sqlite3-> fetchAll（）返回NULL

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