public Properties getProperties (); public Collection supportedOptions ();
In addition to creating PersistenceManagers,
the PersistenceManagerFactory also supplies
metadata about the current JDO implementation. The
getProperties method returns a
Properties instance containing, at a
minimum, the following keys:
The supportedOptions method returns a
Collection of Strings
enumerating the JDO options supported by the implementation.
The following option names are recognized:
javax.jdo.option.TransientTransactional: Support for the transient-clean and transient-dirty lifecycle states.javax.jdo.option.NontransactionalRead: Support for theNontransactionalReadproperty described in Section 7.2.2, “PersistenceManager and Transaction Defaults”.javax.jdo.option.NontransactionalWrite: Support for theNontransactionalWriteproperty described in Section 7.2.2, “PersistenceManager and Transaction Defaults”.javax.jdo.option.RetainValues: Support for theRetainValuesproperty described in Section 7.2.2, “PersistenceManager and Transaction Defaults”.javax.jdo.option.Optimistic: Support for theOptimisticproperty described in Section 7.2.2, “PersistenceManager and Transaction Defaults”.javax.jdo.option.ApplicationIdentity: Support for JDO application identity, as described in Section 4.5.2, “Application Identity”.javax.jdo.option.DatastoreIdentity: Support for JDO datastore identity, as described in Section 4.5.1, “Datastore Identity”.javax.jdo.option.NonDurableIdentity: Support for non-durable identity, a seldom-used form of JDO identity not covered in this document.javax.jdo.option.ArrayList: Support for persistentjava.util.ArrayListfields.javax.jdo.option.LinkedList: Support for persistentjava.util.LinkedListfields.javax.jdo.option.TreeMap: Support for persistentjava.util.TreeMapfields.javax.jdo.option.TreeSet: Support for persistentjava.util.TreeSetfields.javax.jdo.option.Vector: Support for persistentjava.util.Vectorfields.javax.jdo.option.List: Support for persistentjava.util.Listfields.javax.jdo.option.Array: Support for persistent array fields.javax.jdo.option.NullCollection: This string will be present if the implementation can differentiate betweennulland empty collections and maps when querying or loading data from the datastore.javax.jdo.option.ChangeApplicationIdentity: This string will be present if the implementation allows you to change the primary key fields of persistent objects, effectively changing their identity.javax.jdo.option.GetDataStoreConnection: Whether thePersistenceManager.getDataStoreConnectionis supported.javax.jdo.option.BinaryCompatibility: This string will be present if the implementation is binary compatible with the JDO reference enhancer.javax.jdo.option.UnconstrainedQueryVariables: Support for unconstrained variables in JDOQL queries. See Example 11.10, “Unconstrained Variables”.javax.jdo.query.JDOQL: Support for JDOQL queries. We discuss queries in Chapter 11, Query.javax.jdo.query.SQL: Support for SQL queries. We discuss SQL queries in Chapter 17, SQL Queries.
Vendors may include strings for other options and query languages they support as well.
![[Note]](img/note.gif) | Note |
|---|---|
Kodo currently supports all options except
|
