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Gemello is a relational database written in pure Java. Its design is aimed at teaching. If you're searching for a fast relational engine, Gemello won't be a good choice. Is's rather a good and simple example of relational database implementation.
GQL provides a generic way to access different SQL databases. It is written in C++, but there is a Python binding. The interface is modelled closely after JDBC (Java Database Connectivity). GQL also includes an interactive database terminal.
This toolkit facilitates easier connections between stored data, intermediate data, and data presented to users in Java applications. The classes are abstracted as much as possible to allow wide use for various types of programs.