David Ezzio's Using and Understanding Java Data Objects PDF

By David Ezzio

ISBN-10: 1430207671

ISBN-13: 9781430207672

ISBN-10: 1590590430

ISBN-13: 9781590590430

JAVA info OBJECfS (JDO) specifies a clear patience carrier for Java items. The specification describes a common framework for storing and retrieving the in step with­ sistent kingdom ofJava gadgets. The JSR-12 professional team outlined JDO utilizing the Java group approach. JDO contains a specification, a reference implementation, and a know-how compatibility package (TCK). All 3 may be downloaded from the JavaCommunityProcessWebsite (http://W~M.jcp.org/jsr/detail/12.jsp). Anumber of owners have created implementations of JDO and supply models in their items for you to obtain from the internet. URLs to a couple of those owners are chanced on close to the tip of this advent. Java programmers use instruments to make their initiatives profitable. so much functions and server-side parts contain relocating info among items in reminiscence and protracted garage. JDO offers to alter the way in which that Java programmers shop and retrieve item nation. JDO simplifies the application's code, raises the appli­ cation's portability, and is helping to split issues within the application's layout. in comparison to latest choices, JDO makes patience more uncomplicated to appreciate, more straightforward to version, and more uncomplicated to code. Who may still learn This booklet This publication is meant for Java programmers and alertness architects. It assumes that you just understand how to application in Java, and it assumes that you really want to exploit JDO and know how it really works. This publication emphasizes what you want to recognize to take advantage of JDO effectively.

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Option. TransientTransactional option and the JDO-transient object is passed to the persistence manager's make Transactional method. An object can be in the transient-clean state even when a transaction is not active. • A transient-clean object becomes transient -dirty when any of its transactional or persistent fields are changed within a transaction. After the transaction commits or rolls back, the transient-dirty object becomes transient-clean again. When an application data object is persistent but not transactional, its management state is one of the two persistent and nontransactional states: • It is hollow when the values of its persistent fields have not been read from the datastore.

The JDO implementation supplies these derived classes to implement change notification, change tracking, and other features. JDO's use of classes derived from the supported mutable system classes is transparent to the application. Their use has no impact on the application's logic. Applications are free to use the instances of the supported system classes whenever they like. Arrays Support for arrays is an optional feature of the JDO implementation. Arrays are embedded objects in JDO and are usually stored as second class objects in the datastore.

This section describes the most restrictive rules that work everywhere. There are only two rules that you need to follow for portability. First, application data classes that are not derived, directly or indirectly, from the same application data class should use distinct application identity classes. If you follow this rule, you will not associate in the roo metadata the same application identity class with different application data classes. Second, the application should associate the least-derived application data class, whether abstract or concrete, with a concrete application identity class.

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Using and Understanding Java Data Objects by David Ezzio


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