Cakephp从数据库检索信息

我在理解CakePHP中与数据库的连接时遇到了一些问题。

I'm having some problems understanding the connection to the database in CakePHP.

我有一个名为user的表（取自CakePHP教程网站）在表格中添加了另一行称为 bio，我可以将文本插入到bio中，但是我无法检索到它。
我设法通过以下方式检索所有其他行：

I have a table called user (which was taken from the CakePHP tutorial website) I added another row to the table called "bio" I am able to insert text into the bio but i'm not able to retrieve it. I've managed to retrieve all the other rows by:

     $name = CakeSession::read("Auth.User.username");
     $mail = CakeSession::read("Auth.User.email");
     $created = CakeSession::read("Auth.User.created");
     $id = CakeSession::read("Auth.User.id");

但由于某些原因，它不适用于生物。

but for some reason it won't work with the bio.

我是否需要向控制器添加任何东西才能做到这一点？还是我需要设置的变量？

Do I need to add anything to controllers to be able to this? Or is it a variable that I need to set?

谢谢！