April 2003
Beginner to intermediate
380 pages
12h 25m
English
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Chapter 1. An Initial Tour
Java is a language that defines a runtime environment in which user-defined classes execute. Instances of these user-defined classes may represent real-world data that is stored in a database, filesystem, or mainframe transaction processing system. Additionally, small-footprint environments often require a means of managing persistent data in local storage.
Because data-access techniques are different for each type of data source, accessing the data presents a challenge to application developers, who need to use a different application programming interface (API) for each type of data source. This means that you need to know at least two languages to develop business logic for these data sources: the Java programming language and the specialized data-access language required by the data source. The data-access language is likely to be different for each data source, driving up the costs to learn and use each data source.
Prior to the release of Java Data Objects (JDO), three standards existed for storing Java data: serialization, Java DataBase Connectivity (JDBC), and Enterprise JavaBeans (EJB) Container Managed Persistence (CMP). Serialization is used to write the state of an object, and the graph of objects it references, to an output stream. It preserves the relationships of Java objects such that the complete graph can be reconstructed at a later point in time. But serialization does not support transactions, queries, or the sharing of data among multiple ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.