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getJdbcTemplate().update( "UPDATE BOOK_STOCK SET STOCK = STOCK - 1 "+ "WHERE ISBN = ", new Object[] { isbn }); getJdbcTemplate().update( "UPDATE ACCOUNT SET BALANCE = BALANCE - "+ "WHERE USERNAME = ", new Object[] { price, username }); transactionManager.commit(status); } catch (DataAccessException e) { transactionManager.rollback(status); throw e; } } } Before you start a new transaction, you have to specify the transaction attributes in a transaction definition object of type TransactionDefinition. For this example, you can simply create an instance of DefaultTransactionDefinition to use the default transaction attributes. Once you have a transaction definition, you can ask the transaction manager to start a new transaction with that definition by calling the getTransaction() method. Then it will return a TransactionStatus object to keep track of the transaction status. If all the statements execute successfully, you ask the transaction manager to commit this transaction by passing in the transaction status. Because all exceptions thrown by the Spring JDBC template are subclasses of DataAccessException, you ask the transaction manager to roll back the transaction when this kind of exception is caught. In this class, you have declared the transaction manager property of the general type PlatformTransactionManager. Now you have to inject an appropriate transaction manager implementation. Because you are dealing with only a single data source and accessing it with JDBC, you should choose DataSourceTransactionManager. Here you also wire a dataSource because the class is a subclass of Spring s JdbcDaoSupport, which requires it. <beans ...> ... <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"ref="dataSource"/> </bean> <bean id="bookShop" class="com.apress.springenterpriserecipes.bookshop.spring. TransactionalJdbcBookShop"> <property name="dataSource"ref="dataSource"/> <property name="transactionManager"ref="transactionManager"/> </bean> </beans>

Some developers can even bring negative productivity to a team They may not understand the sophistication of the team s code, and will introduce bugs that require lots of rework They may demand so much help that their own work fails to compensate for the lost productivity of the other team members Or their conflicting styles and difficult personalities may result in unproductive disagreements and reduced motivation all around..

public void hello() { System.out.println("Hello! " + message); } } To configure a bean of type HelloWorld with a message in the Spring IoC container, you create the following bean configuration file. According to this book s convention, let s create it in the root of the classpath with the name beans.xml. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean id="helloWorld" class="com.apress.springrecipes.hello.HelloWorld"> <property name="message" value="How are you " /> </bean> </beans>

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Using Beans from the Spring IoC Container You can write the following Main class to instantiate the Spring IoC container with the bean configuration file beans.xml, located in the root of the classpath. Then you can get the helloWorld bean from it for your use. package com.apress.springrecipes.hello; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); HelloWorld helloWorld = (HelloWorld) context.getBean("helloWorld"); helloWorld.hello(); } } If everything is fine, you should see the following output in your console, preceded by several lines of Spring s logging messages: Hello! How are you

Suppose that you have a code block, but not the entire body, of a business method that has the following transaction requirements: Start a new transaction at the beginning of the block. Commit the transaction after the block completes successfully. Roll back the transaction if an exception is thrown in the block.

If you are an Eclipse user, you can install Spring s official Eclipse plug-ins, called Spring IDE (http://springide.org/). IntelliJ IDEA has similar Spring support features, but they are not as powerful or updated as Spring IDE. In this book, I will focus on Spring IDE only. There are three ways you can install Spring IDE: Add Spring IDE s update site (http://springide.org/updatesite/) in Eclipse s update manager and install it online. Download Spring IDE s archived update site and install it in Eclipse s update manager as a local site. Download Spring IDE s archive and extract it into Eclipse s installation directory. Of these, I strongly recommend installing Spring IDE from its update site if your machine has an Internet connection available. Failing that, you should install it from an archived local site. These methods can help you to check if all Spring IDE s dependent plug-ins are installed already.

If you call Spring s transaction manager API directly, the transaction management code can be generalized in a technology-independent manner. However, you may not want to repeat the boilerplate code for each similar code block.

From Eclipse s Help menu, choose Software Updates Find and Install. Eclipse will then ask you whether you would like to update currently installed features or install new features. For the first time installing Spring IDE, choose Search for new features to install. Next, you will see a list of existing update sites. If you can t see Spring IDE s update site here, add it by selecting Add Remote Site, and enter the name and URL of this site, as shown in Figure 2-3.

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