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Object-relational mapping (ORM) is the name given to the technologies, tools, and techniques used to bridge the divide between objects and relational databases ORM tools allow you to declaratively map data objects to data and relations in a relational database, allowing programmers to work with information from a relational database in the form of Java objects This breed of tools generates all of the SQL code needed to interact with the database Developers work at the object level, and the concept of queries and transactions are applied to the objects rather than database objects Although they re under the same umbrella, the tools can vary greatly in the way they work, from the level of transparency to whether they work by generating code, modifying bytecode, or using runtime inspection The concept of transparency as applied to ORM tools is still very vague in the industry.

Searching from a Windows Explorer folder yields an uncategorized list of items from that folder and its subfolders. It s a great way to find something when you know more or less where it is. For example, if you re looking for a music item but you re not sure how the subfolders of your Music folder are set up, don t even bother trying to figure the structure out; just type in the Search box. Here again, the word wheel is your friend. Unless your fingers are as fleet as Rachmaninoff s, the odds are that any of his music you have will appear in the Search results long before you get to the last syllable of his name (see Figure 7-18). (What s more, if you try to type the whole thing and make a mistake somewhere along the line, you re likely to wind up with nothing.)

Persistence transparency or orthogonality implies that objects are treated without any implicit notion of persistence Most of the existing tools aren t truly transparent, yet they provide a good separation of concerns by isolating the persistence of objects behind very simple object-oriented constructs In Hibernate for example, transparency means that the Plain Old Java Objects (POJOs) being mapped have no notion that they are persistent objects Also worthy of consideration is how to fit the way a certain tool works with the rest of your development process With some tools, you start with an object model and derive a relational persistence model; with others, you start with a relational model and derive an object model.

To set the stage for the development throughout the rest of the book, you need to first create a suitable directory structure (see Figure 3-5) as well as an initial Ant buildfile for the TechConf system.

Ch apt er 3 rUB Y S B U IL DING B L OC K S : Da t a , e X p r e S S I O N S , a N D F LO W C O N t r O L

Most of the time you ll find that you have both an existing object model and a relational model, in which case most tools fall short of expectations and most of the mapping work is manual Sometimes it is impossible to avoid the situation when trade-offs need to be made between your object model and the database schema It s important that both models are developed in cooperation An ORM tool can help this collaborative work, but it s the human factor that plays the larger role Object persistence is, like most hard problems, all about the trade-offs The theme with Java persistence is about choices, as with many things in Java No tool is perfect for every persistence scenario Some tools trade transparency for performance or simplicity for capabilities Some of the questions that arise during the selection (or creation) of an object-relational tool include the following:.

Another option to force the order of join processing is to execute the statement SET FORCEPLAN ON. This will affect all queries in the session.

Rails has been in popular use since the end of 2004, and it has attracted the interest of thousands of developers, many of whom blog about the framework or release the source of their own Rails applications for free. You can also look to some large-scale Rails applications for inspiration. The best way to learn Rails, beyond the basics, is to keep up with the new features being added to the framework as it is being developed, to read the source code of other people s applications, and to experiment. Rails isn t something that you can master quickly. This section provides links to several useful references, books, and example applications you can investigate.

Return customers for whom you cannot find any employee from the USA for whom you cannot find any order placed for the subject customer and by the subject employee