Question

我正在Slim 3应用程序中编写自己的类。我想有一个自己的课来处理数据库查询。代码如下：

var jsonStr = @"{
                    ""User"":{
                              ""username"":""Vinayaka"",
                              ""email"":""Vinayaka@mindsol.in"",
                              ""ref_id"":""43523543"",
                              ""state_code"":""UP"",
                              ""active_status"":""1"",
                              ""user_type"":""Admin"",
                              ""last_active"":""2018-09-22 13:50:23""
                             }
                        }";

var json = new JavaScriptSerializer();
var data = json.Deserialize<dynamic>(jsonStr);

foreach(KeyValuePair<string,object> p in data["User"])
{
    Console.WriteLine(string.Format("{0} : {1}", p.Key, p.Value));
}

在routes.php中，我得到了这样的内容：

<?php
class DatabaseOperator { 

    private $dbconnection;
    function __construct($dbconnection) {
        $this->dbconnection = $dbconnection;
    }

    public function getUserPermissions($user_id) {
        $user_permissions = "SELECT list_id FROM permissions WHERE user_id='$user_id'";
        $sth = $dbconnection->prepare($user_permissions);
        $sth->execute();
        $user_permissions_result = $sth->fetchAll();
        $result_permissions = array();
        foreach ($user_permissions_result as $row) {
            $list_id = $row['list_id'];
            $this->logger->info("User has access to List ID: " . $list_id);
            array_push($result_permissions, $list_id);
        }
        return $result_permissions;
    }

    public function getUserID($username) {
        $sqluser = "SELECT user_id FROM users WHERE username='$username'";
        // TODO: Android REG_ID from DB
        $sth = $dbconnection->prepare($sqluser);
        $sth->execute();
        $res = $sth->fetch(PDO::FETCH_ASSOC);
        return $res['user_id'];
    }
}
?>

但是访问路线会给我这个错误：

由于以下错误，应用程序无法运行：
  在null上调用成员函数prepare（）
  文件：/var/www/vhosts/hosting114426.a2f69.netcup.net/httpdocs/rememberly/classes/DatabaseOperator.php行：25
  跟踪<＃0 /var/www/vhosts/hosting114426.a2f69.netcup.net/httpdocs/rememberly/src/routes.php(209）：DatabaseOperator-> getUserID（'testuser'）

因此$ dbconnection为null似乎存在问题。但是，如果我在我的routes.php中使用$app->get('/login', function (Request $request, Response $response, array $args) { $username = $request->getServerParam('PHP_AUTH_USER'); if (isset($username)) { $this->logger->info("Authenticated user: " . $username); $databaseOperator = new DatabaseOperator($this->db); $user_id = $databaseOperator->getUserID($username);，它将正常工作。因此$ this-> db不为空。

那这里是什么问题？

Answer 1

<?php
$slimSettings = [
/* ... */
];
$container = new \Slim\Container(['settings' => $slimSettings]);
$container['db'] = function ($c) {
    $dns = ''; // PDO dns
    $dbUser = ''; // database user
    $dbPass = ''; // database password
    return new \PDO($dns, $dbUser, $dbPass);
};

/* ... */
$app = new \Slim\App($container);
/* ... */
$app->get('/login', function (Request $request, Response $response, array $args) {
    $username = $request->getServerParam('PHP_AUTH_USER');
    if (isset($username)) {
        $this->logger->info("Authenticated user: " . $username);
        $databaseOperator = new DatabaseOperator($this->db);
        $user_id = $databaseOperator->getUserID($username);
    }
});

SLIM3-在自己的类中访问数据库容器

1 个答案: