April 2003
Beginner to intermediate
380 pages
12h 25m
English
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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 PersistenceManagers
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 ...
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