在没有 PDO 的 OOP 中与 SQLSRV 驱动程序的数据库连接

Question

我正在尝试为我的网站制作一个 OOP 登录系统，但在连接到 MS SQL 数据库时遇到了真正的问题，所以真的是第一个障碍！

我正在使用 SQLSRV 驱动程序，安装 PDO 不是一种选择。我收到以下错误，我理解这意味着未建立连接并且db_connection变量为空：

在第 79 行对 C：\xxxx\auth.php 中的非对象上的成员函数 set_charset） 调用的致命错误

class Auth
{
/**
 *  @var string - database connection
 */
private $db_connection = null;
/**
 * @var array - collection of error messages
 */
public $errors = array();
/**
 * @var array - collection of success / neutral messages
 */
public $messages = array();

public function __construct()
{
    // create/read session, absolutely necessary
    session_start();
    // check the possible login actions:
    // if user tried to log out (happen when user clicks logout button)
    if (isset($_GET["logout"])) {
        $this->doLogout();
    }
    // login via post data (if user just submitted a login form)
    elseif (isset($_POST["auth"])) {
        $this->doauthWithPostData();
    }
}

// AUTHENTICATE
private function doauthWithPostData()
{
    $serverName = "%server%";
    $User = "%user%";
    $Pass = "%pwd%";
    $DB = "%dbname%";

    $connectionInfo = array( "Database"=>$DB, "UID"=>$User, "PWD"=>$Pass);

    // check login form contents
    if (empty($_POST['usr'])) {
        $this->errors[] = "Username field was empty.";
    } elseif (empty($_POST['usr_pwd'])) {
        $this->errors[] = "Password field was empty.";
    } elseif (!empty($_POST['usr']) && !empty($_POST['usr_pwd'])) {
        // create a database connection, using the constants from db.php (loaded in index.php)
        $this->db_connection = sqlsrv_connect( $serverName, $connectionInfo);
        //$this->db_connection = new mssql_connect(constant(DB_HOST), constant(DB_USER), constant(DB_PASS));
        // change character set to utf8 and check it
         if (!$this->db_connection->set_charset("utf8")) {
            $this->errors[] = $this->db_connection->error;
         }
        // if no connection errors (= working database connection)
         if (!$this->db_connection->connect_errno) {
        // escape the POST stuff
             $user_name = $this->db_connection->ms_escape_string($_POST['user_name']);
           // database query, get all the info of the selected organisation
            $qry = "SELECT USR, PASSWORD
                    FROM USERS
                    WHERE USR = '" . $_POST['usr'] . "';";
            $result_of_auth_check = $this->db_connection->query($qry);
            // if this org exists
            if ($result_of_auth_check->num_rows == 1) {
                // get result row (as an object)
                $result_row = $result_of_auth_check->fetch_object();
                // password_verify() function to check if the provided password fits
                // the hash of that user's password
                if (password_verify($_POST['usr_pwd'], $result_row->user_password_hash)) {
                    // write user data into PHP SESSION
                    $_SESSION['user_auth_status'] = $_POST['usr'];
                } else {
                    $this->errors[] = "Wrong password. Try again.";
                }
            } else {
                $this->errors[] = "This user does not exist.";
            }
        } else {
            $this->errors[] = "There was a problem connecting to the database.";
        }
    }
}

我尝试在 OOP 之外以完全相同的方式建立连接，它工作得很好。我看不出出了什么问题！感谢您的任何帮助，非常感谢！

Answer 1

sqlsrv没有

一个名为set_charset的函数。相反，可以在连接参数数组中设置此选项，如下所示：

$connectionInfo = array(
   "Database"     => $DB,
   "UID"          => $User,
   "PWD"          => $Pass,
   "CharacterSet" => "UTF-8"
);

并检查对以下内容的更改：

...
if (!$this->db_connection) {
   // You can modify here however you like
   $this->errors[] = print_r(sqlsrv_errors(), true);
}

您还应该删除第二次检查，因为我们使用的是上面的代码：

// if no connection errors (= working database connection) if (!$this->db_connection->connect_errno) { ...

您的代码中似乎有更多的错误，例如sqlsrv也没有像ms_escape_string这样的函数。您应该更多地查看官方文档。

Answer 2

使用 sqlsrv_errors（） 更清楚地了解问题。我猜你没有安装SQL本机客户端。