By Sameer Tyagi, Michael Vorburger, Keiron McCammon, Heiko Bobzin
The necessity for patience is a prerequisite for any company software and the case is not any diverse for purposes written within the Java programming language. a regular Java program will encompass code that's accountable for storing and retrieving the appliance particular info to a couple form of garage facility in order that it may be retrieved and used at a later time. Now there's a new alternative-Java info items (JDO) that's good positioned to alter the best way builders have usually perceived endurance of their functions. JDO is a customary built below the auspices of the Java group procedure via a couple of individuals. JDO is a brand new know-how, however it is one who holds nice promise. while you're an architect, a developer or perhaps a supervisor that's concerned with patience in Java and wish to achieve an perception into this expertise then this ebook is for you.
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Extra resources for Core Java Data Objects
Hayes Getting Started with JDO This chapter explains the basics of how JDO works and how to use JDO to create, read, update and delete persistent objects. It introduces some of the advanced concepts b ehind JDO and aims to provide sufficient understanding to allow a Java programmer to develop an application using JDO. The examples for this chapter are located in directory “examples/chapterX” on the CD accompanying the book. 1 HOW DOES JDO WORK? The goal of JDO is to be able to transparently store instances of any user defined Java class in a datastore and retrieve them again with as few a limitations as possible.
Content subject to change 14 Chapter 3 Object Lifecycle JDO defines a number of states for persistent objects, these states are used by the JDO runtime to manage the in-memory lifecycle of persistent objects. Whilst it is not necessary to really understand the JDO object lifecycle (its really of primary concern to the JDO vendors) an appreciation of what happens under the covers is always a good idea. X on Object Lifecycles for more details. 6 READING AN OBJECT Once an instance has been made persistent and its fields stored in the datastore it can be retrieved again at some later point in time, either within the same application or by a different application.
Buy” discussion. 1. Caching Now that objects can be instantiated on-demand and unique references are returned for unique data in the database, it is a small step to realize further caching. Why should a call to getAuthor in the above example do anything at all, if the author object was previously already retrieved? Just the firstly returned Java reference can be returned again. The following pseudo code illustrates the idea: • Check, if the book instance already contains valid data If yes, return the Author reference • Take the book's BOOKID • Create a JDBC statement like SELECT * FROM BOOKS WHERE BOOKID = id • Copy necessary fields of the result record into the book instance • Create an Author instance • Copy the AUTHORID from the result record into the Author instance • Mark the Author instance, so that it is loaded when a get() method is called • Return the author instance.