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Installing and configuring iBATIS
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3.2 Distribution contents
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Regardless of how you get the distribution (unzip or build), you will end up with the same set of seven JAR and ZIP files. A JAR file is a Java archive and is how most Java libraries are distributed it is actually just a ZIP file with extra information in it. The important files in the distribution are shown in table 3.2.
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Table 3.2 The most important files in the iBATIS distribution Purpose This file contains common components that are used in both the SQL Map and DAO frameworks. In the near future (by the time this book ships) these common classes may be merged into a single JAR file along with the SQL mapper classes currently found in the ibatis-sqlmap-2.jar file. This file contains the SQL Map framework components. This file contains the DAO framework components. This file contains a limited set of the JavaDoc documentation for the project that is specifically trimmed down for people who are only working with the framework, not on the framework. This file contains all of the JavaDoc documentation for the project. This file contains the entire source used to build the framework JAR files.
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File ibatis-common-2.jar
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ibatis-sqlmap-2.jar ibatis-dao-2.jar user-javadoc.zip
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dev-javadoc.zip ibatis-src.zip
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You can begin to see of how lightweight the iBATIS framework is by how few dependencies and files are required. That said, the framework has some optional functionality that can be enabled by including other frameworks such as cglib, a common bytecode enhancement framework that you will learn more about in the next section.
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3.3 Dependencies
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There are other features of iBATIS that you will probably want to configure, such as bytecode enhancement for lazy loading, which we look at next. Furthermore, in the rest of the book we will be exploring the capabilities of the iBATIS framework. Many of those features will require other open source or commercial packages to make them work properly. To enable those additional features, you will need to fulfill their dependencies and configure iBATIS to use them. This section provides a brief overview of these features.
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Dependencies
3.3.1 Bytecode enhancement for lazy loading
Bytecode enhancement is a technique that modifies your code at runtime, based on configuration or other rules that you define. For example, the iBATIS framework allows you to relate SQL queries with other SQL queries. It is easy to imagine a situation where you may have a list of customers, a list of orders for each customer (as part of that customer object), and a list of line items as part of the order objects. In that case, you can define your SQL map so that all of those lists are related and loaded from the database automatically, but only if they are actually requested by the application.
NOTE
If you are familiar with O/RM tools, you may be thinking that this is the same functionality that they provide. While the functionality is similar, the iBATIS framework does something a bit more flexible. While O/RM tools allow you to relate tables and views only, the iBATIS framework allows you to relate any number of queries, not just database objects.
This functionality is very useful, and can save you some coding in cases where you have related queries. However, if you have 1,000 customers who each have 1,000 orders with 25 line items, the combined data would consist of 25,000,000 objects. Needless to say, this has grown to a point where it is not feasible to have it all in memory at once. Lazy loading is intended to deal with these kinds of situations. What iBATIS lets you do is load only the data that you actually need. So, in the previous example, you could reconfigure the SQL map to load the related lists lazily. Therefore, when your user is looking at the list of customers, only the list of 1,000 customers is in memory. The information to load the other lists is kept available, but the data is not loaded until it is actually requested. In other words, the order information is not loaded until the user clicks on a customer to see that customer s orders. At that point, the framework loads that customer s list of 1,000 orders; none of the others are loaded. If the user then clicks on an order to drill down more, only the 25 line items on the selected order are loaded. So, by making a configuration change and not changing a single line of code, we have gone from 25,000,000 objects to 2,025. This means our application runs in about one ten-thousandth of the time as it did in the original configuration.
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