By Sameer Tyagi, Michael Vorburger, Keiron McCammon, Heiko Bobzin
Middle Java info gadgets gives you: * functional examples displaying how JDO should be utilized to present purposes * strong insights for utilizing JDO to architect new platforms extra successfully * step by step assistance for integrating JDO with different J2EE applied sciences * top practices for utilizing JDO in real-world enterprise environments
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Additional resources for Core Java Data Objects
This mapping has very good performance characteristics for most query operations, except for queries on the Publication superclass "with subclasses," which could not be expressed as a table join and would lead to two separate queries or a UNION. 4 Security When using O/R mapping, other problems result from different access restrictions to data. In Java, public, protected, private, and package access defines the rules for field read and write access, as well as method Part 1: Introduction 37 38 Part 1: Introduction invocation.
Hayes Using JDO to build an application that creates, reads, updates, and deletes persistent instances of Java classes is easy and requires only some basic knowledge about how JDO works and how to use it. Armed with this knowledge, you can develop your first JDO application and persist instances of Java classes transparently in a datastore. This chapter is a guide to getting started with JDO, providing an understanding of how JDO works and how to use the basic APIs, and exploring some of the more advanced concepts related to using JDO.
Relational databases, however, have a different view: A table is a set of rows, on which query operations can be performed. 5. Naming conventions are different: Class names can be long, are case sensitive, and include a hierarchical package name; attribute names can also be long. SQL table and column labels, however, are often of (very) limited size. The class-to-table and attribute-to-field name mapping thus needs to be addressed. Automatic name mapping schemas or manual specification of table and column names are imaginable, and often both provided by JDO implementations and schema generators.