Python DB-API：如何处理不同的参数？

I'm implementing a Python ontology class that uses a database backend to store and query the ontology. The database schema is fixed (specified in advance), but I don't know what type of database engine is being used. However, I can rely on the fact that the Python interface of the database engine uses the Python DB-API 2.0 (I'm implementing a Python ontology class that u