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What is iBATIS
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Under the hood, iBATIS will run nearly the same JDBC code. iBATIS will get a connection to the database, set the parameters, execute the statement, retrieve the results, and close all of the resources. However, the amount of code that you need to write is significantly reduced. Listing 2.3 shows the code needed for iBATIS to run the exact same statement.
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Listing 2.3 iBATIS, which is much less verbose than JDBC
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<select id="getEmployee" parameterClass="java.lang.Integer" resultClass="Employee"> SELECT ID as id, EMPLOYEE_NUMBER as employeeNumber, FIRST_NAME as firstName, LAST_NAME as lastName, TITLE as title FROM EMPLOYEE WHERE EMPLOYEE_NUMBER = #empNum# </select>
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There is no comparison. The iBATIS code is more concise and easier to read, and thus easier to maintain. We ll discuss more of the benefits of iBATIS later in this chapter. But for now, you re probably wondering how this gets executed from the Java code. As you ve seen in earlier examples,, it s a very simple single line of code:
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Employee emp = (Employee) sqlMap.queryForObject("getEmployee", new Integer(5));
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There s nothing to it. This line of code executes the statement, sets the parameters, and retrieves the results as a real Java object. The SQL is encapsulated and externalized neatly in an Extensible Markup Language (XML) file. iBATIS manages all of the resources behind the scenes, and the net effect is the same as the JDBC code we saw earlier in listing 2.2. This begs the question, does iBATIS work the same way for all systems Is it best suited for a particular kind of application The next few sections will answer that, starting with how well iBATIS works with small applications.
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2.2.1 iBATIS for small, simple systems
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Small applications often work with only a single database, and they often have a fairly simple user interface and domain model. The business logic is very basic, or
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How it works
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perhaps nonexistent for some simple CRUD (Create, Read, Update, Delete) applications. There are three reasons why iBATIS works well with small applications. First, iBATIS itself is small and simple. It doesn t require a server or any sort of middleware. No additional infrastructure is required at all. iBATIS has no thirdparty dependencies. A minimal installation of iBATIS consists of only two JAR files that total about 375KB of disk space. There is no setup beyond the SQL Mapping files themselves, so in a matter of minutes you can have a working persistence layer. Second, iBATIS does not impose on the existing design of the application or the database. Therefore, if you have a small system that is already partially implemented or perhaps even released, it is still easy to refactor the persistence layer to use iBATIS. Because iBATIS is simple, it won t overcomplicate the architecture of the application at all. The same might not be true of object/relational mapping tools or code generators that make assumptions about the design of either the application or the database. Finally, if you ve been working with software for any length of time, you ll likely agree that it s almost inevitable that any small piece of software will one day become a large piece of software. All successful software has a tendency to grow. It s a good thing, then, that iBATIS is also very good for large systems, and that it can grow to meet the needs of even enterprise-class applications.
2.2.2 iBATIS for large, enterprise systems
iBATIS was designed for enterprise-class applications. More than anything, iBATIS has a great number of advantages in this area over other solutions. The original creator of iBATIS has only ever had the luxury of working applications ranging from large-scale to enterprise-class systems. These systems typically involved not one, but many databases, none of which he had control over. In chapter 1 we discussed various types of databases, including enterprise databases, proprietary databases, and legacy databases. iBATIS was written largely in response to the need to deal with such databases. As a result, iBATIS has a great many features that lend themselves well to the enterprise environment. The first reason has been stated in other areas, but is so important that it cannot be overstated: iBATIS does not make any assumptions about the design of your database or your object model. Regardless of how mismatched these two designs are, iBATIS will work with the application. Furthermore, iBATIS does not make assumptions about the architecture of your enterprise system. If you have partitioned your database vertically by business function, or horizontally by technology, iBATIS will still allow you to effectively work with that data and integrate it into your object-oriented application.
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