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The DbBsddb interface defines a hierarchical database (non-relational) written in [http://www.jcea.es/programacion/pybsddb.htm PyBSDDB]. There is no such thing as a database schema, and the meaning of the data is defined in the Python classes above. The data is stored as pickled tuples and unserialized into the [[Using_database_API#Primary_Objects|primary data types (below)]].
=== DbDjango DB-API ===
The DbDjango DB-API interface defines the Gramps data in terms of ''models'' and ''relations'' from uses a generic interface backed with the general Python SQL implementation, called [httphttps://www.djangoprojectpython.comorg/dev/peps/pep-0249/ Django projectDB-API]. The Gramps' generic interface (gramps.gen.db.generic.DbGeneric) has all of the logic for interacting with the database backend can be any implementation that supports Django, including such popular except for the specific DB access code. Gramps' DB-API (gramps.plugins.db.dbapi.dbapi) implements the details so as to talk to conforming SQL implementations as sqlite, MySQL, Postgresql, and Oracledatabases. The data is retrieved from Other database engines could also implement the SQL fieldsDbGeneric details, serialized and then unserialized into the [[Using_database_API#Primary_Objects|primary data types (below)]]such as a nosql option.
=== Using the Database ===
