PDO的三种连接数据库的方式

try{
	$dsn      = ‘mysql:host=localhost;dbname=myblog‘;
	$username = ‘root‘;
	$passwd   = ‘123456‘;
	$pdo      = new PDO($dsn, $username, $passwd);
	var_dump($pdo);
}catch(PDOException $e){
	echo $e->getMessage();
}

try{
	$dsn      = ‘uri:file://F:\wamp\www\myBlog\dsn.txt‘;
	$username = ‘root‘;
	$passwd   = ‘123456‘;
	$pdo      = new PDO($dsn, $username, $passwd);
	var_dump($pdo);
}catch(PDOException $e){
	echo $e->getMessage();
}
//dsn.txt
mysql:host=localhost;dbname=myblog 

try{
	$dsn      = ‘mypdo‘;
	$username = ‘root‘;
	$passwd   = ‘123456‘;
	$pdo      = new PDO($dsn, $username, $passwd);
	var_dump($pdo);
}catch(PDOException $e){
	echo $e->getMessage();
}
//其中在php.ini文件的任意位置加上以下代码，并保存重启服务器
pdo.dsn.mypdo="mysql:host=localhost;dbname=myblog"