Is it possible to get a collection containing the attributes of all entities (customers, products, etc)?

I’m trying to get a collection from the table eav/attribute (where product’s attributes are present along with customer’s, category’s, etc).

I already tried to retrieve it like a normal model collection:

$entitiesAttributes = Mage::getModel('eav/attribute')->getCollection();

But I get the following error:

Cannot instantiate abstract class Mage_Eav_Model_Attribute

Because, of course, the class Mage_Eav_Model_Attribute is abstract. Is there a way to do it with collections?

Or I should do it directly with SQL?

SELECT * FROM `eav_attribute` ...

Thanks in advance