Chapter 7. Establishing a JDO Runtime Environment
This chapter describes how to establish a JDO runtime environment. This includes specifying the particular JDO implementation to be used, connecting to the datastore, and setting various properties that control the management of transactions and the cache of persistent instances.
Your primary interface when using JDO is the PersistenceManager
interface. You configure a
PersistenceManager
instance by using a
PersistenceManagerFactory
instance,
which you can create by calling a method defined in JDOHelper
. Or, in a Java 2 Platform, Enterprise Edition (J2EE) environment, you
would likely use Java Naming and Directory Interface (JNDI) to store and look
up one or more PersistenceManagerFactory
instances.
You can initialize and set various properties within the PersistenceManagerFactory
, including the
information needed to connect to the datastore. Once you have established
the desired configuration, you call a PersistenceManagerFactory
method to create a
PersistenceManager
instance. You can
create multiple PersistenceManager
s
from a single PersistenceManagerFactory
, and you can alter
some of the properties in a PersistenceManager
once it has been
created.
A PersistenceManager
instance has
a one-to-one relationship with an associated Transaction
instance. The PersistenceManager
interface provides a method
to access this instance. The property settings in the PersistenceManager
and Transaction
instances control the runtime behavior of the ...
Get Java Data Objects now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.