Determines whether the current database is closed or open.
When you finish with an
ODatabaseDocument instance, you should close it to free up resources, using the
close() method. In cases where you are uncertain as to whether the database instance is open or whether it was closed at this particular point in your application, you can check whether it is closed using this method.
This method returns a
boolean value, if
true it indicates that the database is closed. Otherwise, it is currently open.