# Java Persistence API (JPA) Persistence
This service allows you to persist state updates using a SQL or NoSQL database through the Java Persistence API (opens new window). The service uses an abstraction layer that theoretically allows it to support many available SQL or NoSQL databases.
It will create one table named
historic_item where all item states are stored.
The item state is stored in a string representation.
The service currently supports MySQL, Apache Derby and PostgreSQL databases. Only the embedded Apache Derby database driver is included. Other drivers must be installed manually. (See below for more information on that.)
This service can be configured in the file
|url||Yes||JDBC connection URL. Examples:|
|driver||Yes||database driver. Examples:|
Only the Apache Derby driver is included with the service. Drivers for other databases must be installed manually. This is a trivial process. Normally JDBC database drivers are packaged as OSGi bundles and can just be dropped into the
|user||if needed||database user name for connection|
|password||if needed||database user password for connection|
# Adding support for other JPA supported databases
All item- and event-related configuration is done in the file
If a database driver is not an OSGi bundle, the technique below can be used to extend the openHAB classpath.
Other database drivers can be added by expanding the openHAB classpath.
Use the following classpath setup in start.sh (opens new window) / start_debug.sh of openHAB:
cp=$(echo lib/*.jar | tr ' ' ':'):$(find $eclipsehome -name "org.eclipse.equinox.launcher_*.jar" | sort | tail -1);
This will add all .jar files in a folder "lib" in the root of openhab.
All databases that are supported by JPA can be added.
url according to the database definitions.