Question

我正在尝试创建一个我的模型将扩展的数据库连接类。

问题是，即使我告诉它返回PDO连接对象，它也没有返回数据库对象：

class Database {



protected $conn ;
public $user ;
public $pass ;
public $database ;
public $encoding ;

function __construct($user = 'user', $pass = 'pass', $database = 'view4', $host = 'localhost', $encoding = 'UTF8')
{
    try {
        $this->user = $user ;
        $this->pass = $pass ;
        $this->database = $database ;
        $this->encoding = $encoding ;

        $options = array(
                   'PDO::ATTR_ERRMODE' => 'PDO::ERRMODE_WARNING',
                   'PDO::ATTR_PERSISTENT' => TRUE,
                   'PDO::ATTR_DEFAULT_FETCH_MODE' => 'PDO::FETCH_ASSOC',
                   'PDO::ATTR_EMULATE_PREPARES' => FALSE,
                    ) ;

        $this->conn = new PDO('mysql:host='.$host.';dbname='.$this->database,
                              $this->user,
                              $this->pass,
                              $options
                             ) ;
        $this->conn->exec('SET NAMES '.$this->encoding) ;
        return $this->conn ;
    } catch(PDOException $e) {
        $this->handleError($e) ;
    }
}

protected function handleError($e)
{
    if(strstr($e->getMessage(), 'SQLSTATE[')) { 
        preg_match('/SQLSTATE\[(\w+)\] \[(\w+)\] (.*)/', $e->getMessage(), $matches); 
        $code = ($matches[1] == 'HT000' ? $matches[2] : $matches[1]).': ';
        echo $message = $code.$matches[3] ;
        return false ;
    } 
}

protected $conn ; public $user ; public $pass ; public $database ; public $encoding ; function __construct($user = 'user', $pass = 'pass', $database = 'view4', $host = 'localhost', $encoding = 'UTF8') { try { $this->user = $user ; $this->pass = $pass ; $this->database = $database ; $this->encoding = $encoding ; $options = array( 'PDO::ATTR_ERRMODE' => 'PDO::ERRMODE_WARNING', 'PDO::ATTR_PERSISTENT' => TRUE, 'PDO::ATTR_DEFAULT_FETCH_MODE' => 'PDO::FETCH_ASSOC', 'PDO::ATTR_EMULATE_PREPARES' => FALSE, ) ; $this->conn = new PDO('mysql:host='.$host.';dbname='.$this->database, $this->user, $this->pass, $options ) ; $this->conn->exec('SET NAMES '.$this->encoding) ; return $this->conn ; } catch(PDOException $e) { $this->handleError($e) ; } } protected function handleError($e) { if(strstr($e->getMessage(), 'SQLSTATE[')) { preg_match('/SQLSTATE\[(\w+)\] \[(\w+)\] (.*)/', $e->getMessage(), $matches); $code = ($matches[1] == 'HT000' ? $matches[2] : $matches[1]).': '; echo $message = $code.$matches[3] ; return false ; } }

它给了我错误：

我做错了什么？

Answer 1

你不能return来自构造函数的任何东西。在编写new Database时，无论您从构造函数返回什么内容，都会得到一个Database对象。

不从自定义数据库类返回PDO对象

1 个答案: