OTL 4.0 was built as a state machine with a simple C++ stream
like interface. OTL 4.0 has a template framework, which implements
the OTL
stream concept. The framework is comprised of template
classes and
inline functions. The template classes have ordinary classes as
parameters.
The parameters of the class type form a set of classes
that
provide
the framework with an actual implementation of a database API.
Such an implementation is called the OTL-adapter for a given database API. In OTL 4.0, OTL-adapters for the following database APIs were implemented:
The adapters are low level / thin wrappers around the database APIs. The adapter classes are substituted directly into the framework, so the OTL 4.0 works almost at the level of the database APIs because the OTL templates get expanded literally into the database API function calls.
The template framework and an OTL-adapter substituted into the framework generate an instance of the following concrete OTL classes:
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