com.hp.hpl.jena.db

A general database backend for persistent storage of Jena models. This Jena2 release runs on three database engines, MySQL, Oracle, PostgreSQL on two platforms, Linux and WindowsXP. The Jena2 persistence subsystem is largely compatible with Jena1 but does not support the various Jena1 layouts. Existing Jena1 databases cannot be accessed by Jena2 and must be reloaded.

For details on creating and accessing persistent models, see doc/DB/howto.html. For details on options for configuring and accessing persistent models see the doc/DB/options.html. For particulars on persistent models for the various database engines, see doc/DB/mysql-howto.html, doc/DB/oracle-howto.html,doc/DB/postgresql-howto.html.

Note that the recommended mechanism for creating and opening persistent models has changed from Jena1 and also from the preliminary releases of Jena2. Previous mechanisms are now deprecated and users are encouraged to use the new factory mechanisms. See doc/how-to/model-factory.html for details.

This graph stores data persistently in a relational database. It supports the full Graph interface and should operate just like a GraphMem.

Internally, each GraphRDB keeps a list of specialized graphs. For each operation, it works through the list of graphs attempting to perform the operation on each one.

The intention is that each type of specialized graph is optimized for a different type of triple.