thinkphp をデータベースに接続する方法

return array(  
 'DB_TYPE'=> 'mysql',   
 'DB_HOST'=> 'localhost',  
 'DB_NAME'=>'thinkphp',   
 'DB_USER'=>'root',   
 'DB_PWD'=>'',   
 'DB_PORT'=>'3306',  
 'DB_PREFIX'=>'think_',  
 // 其他项目配置参数………  
 );

$db_dsn = "mysql://username:passwd@localhost:3306/DbName";  
 $db = new Db($db_dsn);

$DSN = array(   
 'dbms'     => 'mysql',    
 'username' => 'username',    
 'password' => 'password',    
 'hostname' => 'localhost',    
 'hostport' => '3306',    
 'database' => 'dbname'   
 );  
 $db = new Db($DSN);

protected $connection = array(   
 'dbms'     => 'mysql',    
 'username' => 'username',    
 'password' => 'password',    
 'hostname' => 'localhost',    
 'hostport' => '3306',    
 'database' => 'dbname'   
 );  
 // 或者使用下面的定义  
protected $connection = "mysql://username:passwd@localhost:3306/DbName";

return array(  
 'DB_TYPE'=> 'pdo',   
 // 注意DSN的配置针对不同的数据库有所区别 请参考PHP手册PDO类库部分  
 'DB_DSN'=> 'mysql:host=localhost;dbname=think',  
 'DB_USER'=>'root',   
 'DB_PWD'=>'',   
 'DB_PREFIX'=>'think_',  
 // 其他项目配置参数………  
 );