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What is iBATIS
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2.3.4 Separation of concerns
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With typical JDBC code, it was not uncommon to find database resources such as connections and result sets strewn throughout the application at all layers. We ve all seen the nasty applications with database connections and statements in JSP pages, results being iterated over, and HTML in between it all. It s truly nightmarish. In chapter 1 we discussed the importance of application layering. We saw how the application is layered at a high level and also how the persistence layer is layered internally. iBATIS helps to support this layering by managing all of the persistence-related resources, such as database connections, prepared statements, and result sets. It provides database-independent interfaces and APIs that help the rest of the application remain independent of any persistence-related resources. With iBATIS, you re always working only with true objects and never with arbitrary result sets. iBATIS actually makes it hard to break layering best practices.
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2.3.5 Division of labor
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Some database administrators love their database so much that they won t let anyone else write the SQL for it. Others are just so good at it that everyone else wants them to write the SQL. Whatever the reason, it s always nice to leverage the strengths in your development team. If you have someone who is particularly good at writing SQL but not so hot at writing Java or C#, then let them write the SQL unimpeded. iBATIS allows this to happen. Because the SQL statements are largely separated from the application source code, SQL programmers can write the SQL the way it was meant to be written, without having to worry about string concatenation. Even if the same developers write both the Java code and the SQL, a common request from DBAs while performance tuning a database is Show me the SQL. This is not an easy thing to do with JDBC, as the SQL is often wound up in a series of concatenated strings or perhaps even dynamically built from a combination of iteration and conditionals. With an object relational mapper the situation is even worse, as you usually have to run the application and log the statements, and once you find them, you may not be able to do anything to change them. iBATIS allows full freedom to enable anyone to develop, view, and change the SQL statements run against the database.
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2.3.6 Portability: Java, .NET, and others
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iBATIS is a very portable concept. Because of its relatively simple design, it can be implemented for nearly any language or platform. At the time of this writing, iBATIS supports the three most popular development platforms: Java, Ruby, and C# for Microsoft .NET.
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When not to use iBATIS
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The configuration files aren t entirely compatible across the platforms at this time, but there are plans to make that more of a reality. More important, the concept and approach are very portable. This allows you to be consistent in the design of all of your applications. iBATIS works with more languages and more types of applications than any other framework, regardless of the design of the application. If consistency across your applications is important to you, then iBATIS will work very well for you.
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2.3.7 Open source and honesty
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Earlier we called this section a sales pitch. The truth is, iBATIS is free, open source software. We don t make a dime on it whether you use it or not. You ve already bought the book, so we ve made as much money as we re going to. That said, one of the greatest advantages of open source software is honesty. We have no reason to stretch the truth or lie to you. We ll be very up-front and say that iBATIS isn t the perfect solution for all problems. So let s do something that is rarely done in commercial software documentation. Let s discuss some reasons why you may not want to use iBATIS, and suggest alternatives where appropriate.
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