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Similar to the <transactionManager> element, the <dataSource> element can have any number of properties passed to it for configuration using nested property elements.
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3.6.6 The <typeHandler> element
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The iBATIS framework uses type handlers to convert data from the JDBC databasespecific data types to your application data types, so you can create an application that uses a database in a way that makes the database as transparent as possible. A type handler is essentially a translator it takes a result set column and translates it into a bean property. In most cases, these components are very simple, like the StringTypeHandler that simply calls the result set s getString method and returns it as a String. In other cases, you may have more complex translation requirements. For example, if your database does not have a Boolean data type, you may use a single character with Y and N values to indicate true and false in the database, but then translate that character to Boolean in your application classes. In chapter 12, you will learn more about how to build custom type handlers to deal with these sorts of situations, so we will not go into much more detail here. To deal with this situation, you need to create two classes: a custom type handler and a type handler callback. If you write a custom type handler, you need to tell iBATIS how and when to use them. You do that by using the <typeHandler> element and telling it what it is translating between: the jdbcType and the javaType. In addition, the callback class that is used to manage the type handler is required.
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Installing and configuring iBATIS
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Note that in most cases you ll never need to write a custom type handler. iBATIS has prebuilt type handlers to deal with 99 percent of the cases. Usually a custom type handler is only necessary if you re using an odd database or driver that does not support the typical type mapping common to most databases. Avoid writing custom type handlers if you can, to keep your application simple.
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3.6.7 The <sqlMap> element
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The last section of the SqlMapConfig.xml file is where we configure the <sqlMap> elements. This is where you start to get into the real heavy lifting that iBATIS can do for you. The <sqlMap> element is actually one of the simplest elements in this file, because it only requires one of two attributes to be set. The resource attribute is used if you want to put your SQL Map files on the Java classpath and refer to them that way. Generally, this is the easiest way, because they can be stored in a JAR file or a WAR file, and simply referenced relative to the root of the classpath. In other cases, you may want to be more explicit about the location of the files. In those cases, you can use the url attribute. This attribute can use the java.net.URL class to resolve the location of the file, so you can use any URL value that can be understood by that class.
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3.7 Summary
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Installing iBATIS is a very simple process. In this chapter, we looked at the two ways to get the framework and what to do with it once you have it. Because iBATIS was designed to be simple to use, it has very few dependencies and can be extended to use other tools very easily. While JDBC is a very powerful API, it is also a low-level API, and writing solid code that uses it can be difficult. With iBATIS you can step back from the complexity of dealing with database components, and focus more on the business problems that you are trying to solve. We looked at a simple iBATIS configuration quite possibly the simplest case ever written! In the next chapter, we will examine how to configure it in more detail and how to make it fit into your application perfectly. In this chapter, we also explored the iBATIS configuration files. When using any framework it is essential to have a solid understanding of the fundamentals. This chapter provided just that an understanding of the fundamentals or a quick reference guide.
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Summary
Put a bookmark in this chapter and return to it when you get stuck. If you do not find the answer here, you are likely to find a pointer to another chapter where the answer can be found. The Java API that we will examine in the next few chapters is pretty small in scope, but the framework will behave differently based on how you configure it. We will cover every configuration option again in the next few chapters in much greater detail and with more context and code examples.
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