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11.3 Using the Spring DAO
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There are many different ways that you could use the Spring framework in the data access layer of your application that do not have anything to do with iBATIS. In this section, you ll learn how to use Spring s support for iBATIS to build a data access layer.
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11.3.1 Writing the code
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The Spring framework supports iBATIS using a template pattern for the data access objects, meaning that you start with an existing Spring class (SqlMapClientTemplate) and extend it for your DAO. Using this technique, our AccountDao implementation would look like listing 11.6 using Spring.
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Listing 11.6 Spring version of our SQL Maps Account DAO
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public class AccountDaoImplSpring extends SqlMapClientTemplate implements AccountDao { public Integer insert(Account account) { return (Integer) insert("Account.insert", account);
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Using the Spring DAO
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} public int update(Account account) { return update("Account.update", account); } public int delete(Account account) { return delete(account.getAccountId()); } public int delete(Integer accountId) { return delete("Account.delete", accountId); } public List<Account> getAccountListByExample( Account account) { return queryForList("Account.getAccountListByExample", account); } public List<Map<String, Object>> getMapListByExample(Account account) { return queryForList("Account.getMapListByExample", account); } public List<IdDescription> getIdDescriptionListByExample(Account account) { return queryForList("Account.getIdDescriptionListByExample", account); } public Account getById(Integer accountId) { return (Account) queryForObject("Account.getById", accountId); } public Account getById(Account account) { return (Account) queryForList("Account.getById", account); } }
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The astute reader may notice that this is almost exactly the same as the code we saw in listing 10.11; the only difference is the class that we extend. Everything else in this class is identical. Right now, you might be asking yourself when you would want to use one class or the other. Let s take a look at that next.
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Doing more with DAO
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11.3.2 Why use Spring instead of iBATIS
This is a fair question to ask this is a book about iBATIS, so why are we talking about using something else for the DAO layer Both Spring and iBATIS have their advantages and disadvantages, and the decision requires that you have an understanding of those pros and cons as well as the needs of your application. The advantage of the iBATIS DAO layer is that it is a quick and easy solution. If you have the iBATIS SQL Map download, you have the iBATIS DAO framework, too. It is a much simpler framework than Spring if all you need is transaction and connection management. In that case, the iBATIS DAO layer is probably adequate for your application. The simplicity of the iBATIS DAO is also its biggest disadvantage: once you begin using the DAO pattern, and start taking advantage of the testability that decoupling provides, you will want to use the same approach in different areas of your application. For example, in a Struts application we will use the same approach with our Action class and our business logic class that we use between our business logic class and our DAO class. Instead of the code knowing the implementations it needs, it only knows the interfaces that it needs, and the implementations are plugged in through configuration. This keeps the Action classes simple, and makes every layer easier to test. In addition to being able to manage that separation, Spring can be used to manage your connections and transactions, just like the iBATIS DAO layer does. The big advantage of Spring is that it is not only for DAO classes but for all segments of your application.
11.4 Creating your own DAO layer
Sometimes, neither the iBATIS DAO support nor the Spring DAO support is exactly what you need. In those cases, you need to roll your own DAO layer. Creating a DAO layer from scratch may sound like a daunting task. However, you could be surprised, because it is actually a fairly straightforward pattern to implement. There are essentially three tiers to an effective DAO layer:
1 2 3
Separate interface from implementation. Decouple implementation with an externally configured factory. Provide transaction and connection management.
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