$pdo = new PDO("This is the paramter","root","root");
?? "host", "dbname", "port", "charset"
? ???? ?? ???? ????? ?????. "host"? "dbname"? ??? ??? ??? ???? ???
![[? ?????] Node.js ?? ??](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
