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//通過uri的形式連接數據庫
try{
????$dsn="uri:file://D:\home_workplace\WEB_PAGES\PHPLearning\dsn.txt";
????$username="root";
????$password="123456";
????$pdo=new?PDO($dsn,$username,$password);
????var_dump($pdo);
}catch(PDOException?$e){
????echo?$e->getMessage();???
}