select('name,age')->from('user')->where('age>12')->query(); * 等价于 * $user_array = Db::instance('one_demo')->query('SELECT `name`,`age` FROM `one_demo` WHERE `age`>12'); * @var array */ public static $one_demo = array( 'host' => '127.0.0.1', 'port' => 3306, 'user' => 'mysql_user', 'password' => 'mysql_password', 'dbname' => 'db_name', 'charset' => 'utf8', ); }