错误PDO连接：php_network_getaddresses：的getaddrinfo失败

Question

我想在我的本地机器上运行我的项目，但它带来了以下错误：

Warning: PDO::__construct() [pdo.--construct]: php_network_getaddresses: getaddrinfo failed: The requested name is valid, but no data of the requested type was found. in C:\Program Files (x86)\EasyPHP-5.3.9\www\class\user.php on line 21

我已经定义的连接：

define("DB_DSN", "mysql:host=localhost;dbname=codecalltut"); 
    define("DB_USERNAME", "root"); 
    define("DB_PASSWORD", ""); 
    define("CLS_PATH", "class"); 

user.php中的21行是：

$con = new PDO(DB_DSN, DB_USERNAME, DB_PASSWORD); 

出了什么问题？你能帮我吗？

Answer 1

尝试

define("DB_DSN", "mysql:host=127.0.0.1;dbname=codecalltut"); 

，而不是

define("DB_DSN", "mysql:host=localhost;dbname=codecalltut");