By Christian Bauer
Regrettably i presumed i used to be getting a deal at $0.99. All you get is some pages of intro, not anything else. the outline makes no indication that's all you get.
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Additional info for Hibernate in Action (In Action series)
The relational and object models must both encompass the same business entities. es> 16 CHAPTER 1 Understanding object/relational persistence modeler. The usual solution to this problem is to bend and twist the object model until it matches the underlying relational technology. This can be done successfully, but only at the cost of losing some of the advantages of object orientation. Keep in mind that relational modeling is underpinned by relational theory. Object orientation has no such rigorous mathematical definition or body of theoretical work.
Hence, object databases offer seamless integration into the object-oriented application environment. This is different from the model used by today’s relational databases, where interaction with the database occurs via an intermediate language (SQL). Analogously to ANSI SQL, the standard query interface for relational databases, there is a standard for object database products. The Object Data Management Group (ODMG) specification defines an API, a query language, a metadata language, and host language bindings for C++, SmallTalk, and Java.
It’s the actual, persistent representation of the system state. If an SQL database is used, the database includes the relational schema and possibly stored procedures. ■ Helper/utility classes—Every application has a set of infrastructural helper or utility classes that are used in every layer of the application (for example, Exception classes for error handling). These infrastructural elements don’t form a layer, since they don’t obey the rules for interlayer dependency in a layered architecture.