[fw-db] Something fishy with adapters in Zend_Db

I know I wrote about this before, but I just saw something very fishy in the
OOP design of the adapters mecanism in Zend_Db. Since Zend_Db is not using
interfaces, we have Zend_Db_Adapter_Pdo_Ibm_Db2 which derives or
implements... nothing. We then have Zend_Db_Adapter_Pdo_Ibm which internally
creates a Zend_Db_Adapter_Pdo_Ibm_Db2 and wraps the methods, but doesn't
really enforce any interface or base class. Zend_Db_Adapter_Pdo_Ibm is an
adapter which wraps fake adapters... and we can't use
Zend_Db_Adapter_Pdo_Ibm_Db2 directly, since it doesn't derive from anything
so we can't pass it to Zend_Db_Table for example. We also can't reuse code
or implement an interface in Zend_Db_Adapter_Pdo_Ibm_Db2.

I hope that Zend_Db interfaces will be added and enforced in Zend Framework
2.0, or we'll be stuck with this frankensteinized OOP ;-)
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