Question

我是OOP和PHP的新手，所以我在这里遇到了问题。有人能告诉我，我的连接类出错了吗？它没有连接到数据库，我在try语句中尝试过var_dump（$ this），它要么不起作用。此外，我正在将“dbname”更改为随机名称，代码仍然“有效”..

这是我的代码：

<?php
    class connection {
        // Setting Database Source Name (DSN)
        public function __construct() {
            $dsn = 'mysql:host=localhost;dbname=employee';
            // Setting options
            $options = array (PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
            // Making the connection to the database
            try {
                $this->dbh = new PDO($dsn, 'root', '', $options); 
            }
            catch (PDOException $e) {
                $this->error = $e->getMessage();
            }
        }
    }
    $connection = new connection();
?>

Answer 1

类中的每个方法都必须返回一些东西。尝试：

  class Connection {

   private $connection;    
    // Setting Database Source Name (DSN)
    public function __construct() {
        $dsn = 'mysql:host=localhost;dbname=employee';
        // Setting options
        $options = array (PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
        // Making the connection to the database
        try {
            $this->connection = new PDO($dsn, 'root', '', $options); 
        }
        catch (PDOException $e) {
            $this->error = $e->getMessage();
        }
    }

    public function DoSomething()
    {
         //do something with your $this->connection and return some value;
    }
}
$connection = new Connection();
echo $connection->DoSomething();

为什么连接类不进行连接？

1 个答案: