A message parsing Spring programmatic and declarative transaction examples to explain

Connect one: a message parsing Spring transaction management Detailed; easy to understand, easy to master!

Spring transaction management

Spring transaction management support in two ways:

• Programmatic transaction management:  by Transaction Template manual management services, rarely used in practice,
• XML configuration declarative transaction:  Recommended Use (Code minimally invasive), is actually achieved by AOP

Declarative transaction realization of four ways:

1. TransactionInterceptor declarative transaction-based:  basic Spring declarative transactions, and generally not recommended to use this way, but as before, understood in this way has a great effect on the understanding of Spring's declarative transaction.
2. TransactionProxyFactoryBean based declarative transaction:  Writing an improved version of the first approach simplifies the configuration file, it is recommended early Spring's declarative transaction management, but in Spring 2.0 is no longer recommended.
3. Based on <tx> and <aop> namespace for declarative transaction management:  currently recommended way, its greatest feature is linked closely with the Spring AOP, you can take advantage of powerful expressions of support cut-off point, making management services more flexible.
4. Based on the full annotation of @Transactional way:  the declarative transaction management is simplified to the extreme. Developers only need to add one line after processing Bean enable the relevant configuration in the configuration file, and then you can implement transaction management methods need to implement transaction management classes or use @Transactional specify business rules, but do not function in other ways inferior.

We have to use today is based on programmatic and declarative and AspectJ annotation-based transaction, to achieve bad street transfer business.

Let me now look in this case thought of it, we have added a wrong statement (corresponding to bank power failure and other unforeseen circumstances), if the transfer is not successful this time twice, then the transaction is configured correctly between the two transfers, otherwise, no transaction configuration correct.

You need to complete the task:

• With programmatic transaction management to complete the transfer business
• Use complete transfer business based declarative transaction management of AspectJ
• Use complete transfer business based on the full annotation mode of transaction management @Transactional

Remarks:

The following code is a long time ago, I had just Sping no contact with Maven time to write, so the original add jar the way I used to use Maven small partners can add their own Maven dependency does not use Maven small partner directly jar package can be provided below me.

jar package Address: Link: pan.baidu.com/s/1tqy-mVKx... Password: nid0

Project structure:

development tools:

Myeclipse2017

SQL:

create table `account` (
	`username` varchar (99),
	`salary` int (11)
); 
insert into `account` (`username`, `salary`) values('小王','3000');
insert into `account` (`username`, `salary`) values('小马','3000');
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(1) programmatic transaction management

Note:  through Add / Remove accountMoney () method int i = 10/0 This statement can verify the transaction manager is configured correctly.

OrdersDao.java (Dao 层)

package cn.itcast.dao;
import org.springframework.jdbc.core.JdbcTemplate;
public class OrdersDao {
	// 注入jdbcTemplate模板对象
	private JdbcTemplate jdbcTemplate;
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}
	// 对数据操作的方法不包含业务操作
	/**
	 * 小王少钱的方法
	 */
	public void reduceMoney() {
		String sql = "update account set salary=salary-? where username=?";
		jdbcTemplate.update(sql, 1000, "小王");
	}
	/**
	 * 小马多钱的方法
	 */
	public void addMoney() {
		String sql = "update account set salary=salary+? where username=?";
		jdbcTemplate.update(sql, 1000, "小马");
	}
}
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OrdersService.java (business logic layer)

package cn.itcast.service;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallback;
import org.springframework.transaction.support.TransactionTemplate;
import cn.itcast.dao.OrdersDao;
public class OrdersService {
	// 注入Dao层对象
	private OrdersDao ordersDao;
	public void setOrdersDao(OrdersDao ordersDao) {
		this.ordersDao = ordersDao;
	}
	// 注入TransactionTemplate对象
	private TransactionTemplate transactionTemplate;
	public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
		this.transactionTemplate = transactionTemplate;
	}
	// 调用dao的方法
	// 业务逻辑，写转账业务
	public void accountMoney() {
		transactionTemplate.execute(new TransactionCallback<Object>() {
			@Override
			public Object doInTransaction(TransactionStatus status) {
				Object result = null;
				try {
					// 小马多1000
					ordersDao.addMoney();
					// 加入出现异常如下面int
					// i=10/0（银行中可能为突然停电等。。。）；结果：小马账户多了1000而小王账户没有少钱
					// 解决办法是出现异常后进行事务回滚
					int i = 10 / 0;// 事务管理配置后异常已经解决
					// 小王 少1000
					ordersDao.reduceMoney();
				} catch (Exception e) {
					status.setRollbackOnly();
					result = false;
					System.out.println("Transfer Error!");
				}
				return result;
			}
		});
	}
}
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TestService.java (test method)

package cn.itcast.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TestService {
	@Test
	public void testAdd() {
		ApplicationContext context = new ClassPathXmlApplicationContext(
				"beans.xml");
		OrdersService userService = (OrdersService) context
				.getBean("ordersService");
		userService.accountMoney();
	}
}
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Profiles:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd 
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd 
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
	<!-- 配置c3po连接池 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<!-- 注入属性值 -->
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/wangyiyun"></property>
		<property name="user" value="root"></property>
		<property name="password" value="153963"></property>
	</bean>
	<!-- 编程式事务管理 -->
	<!-- 配置事务管理器 -->
	<bean id="dataSourceTransactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 注入dataSource -->
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<!-- 配置事务管理器模板 -->
	<bean id="transactionTemplate"
		class="org.springframework.transaction.support.TransactionTemplate">
		<!-- 注入真正进行事务管理的事务管理器,name必须为 transactionManager否则无法注入 -->
		<property name="transactionManager" ref="dataSourceTransactionManager"></property>
	</bean>
	<!-- 对象生成及属性注入 -->
	<bean id="ordersService" class="cn.itcast.service.OrdersService">
		<property name="ordersDao" ref="ordersDao"></property>
		<!-- 注入事务管理的模板 -->
		<property name="transactionTemplate" ref="transactionTemplate"></property>
	</bean>
	<bean id="ordersDao" class="cn.itcast.dao.OrdersDao">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>
	<!-- JDBC模板对象 -->
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
</beans> 
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(2) based on the declarative transaction management AspectJ

OrdersService.java (business logic layer)

package cn.itcast.service;
import cn.itcast.dao.OrdersDao;
public class OrdersService {
	private OrdersDao ordersDao;
	public void setOrdersDao(OrdersDao ordersDao) {
		this.ordersDao = ordersDao;
	}
	// 调用dao的方法
	// 业务逻辑，写转账业务
	public void accountMoney() {
		// 小马多1000
		ordersDao.addMoney();
		// 加入出现异常如下面int i=10/0（银行中可能为突然停电等。。。）；结果：小马账户多了1000而小王账户没有少钱
		// 解决办法是出现异常后进行事务回滚
		int i = 10 / 0;// 事务管理配置后异常已经解决
		// 小王 少1000
		ordersDao.reduceMoney();
	}
}
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Profiles:

	<!-- 配置c3po连接池 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<!-- 注入属性值 -->
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/wangyiyun"></property>
		<property name="user" value="root"></property>
		<property name="password" value="153963"></property>
	</bean>
	<!-- 第一步：配置事务管理器 -->
	<bean id="dataSourceTransactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 注入dataSource -->
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<!-- 第二步：配置事务增强 -->
	<tx:advice id="txadvice" transaction-manager="dataSourceTransactionManager">
		<!-- 做事务操作 -->
		<tx:attributes>
			<!-- 设置进行事务操作的方法匹配规则 -->
			<!-- account开头的所有方法 -->
	 <!--
	 propagation:事务传播行为； 
	 isolation：事务隔离级别；
	 read-only：是否只读；
	 rollback-for：发生那些异常时回滚 
	 timeout:事务过期时间
	 -->
			<tx:method name="account*" propagation="REQUIRED"
				isolation="DEFAULT" read-only="false" rollback-for="" timeout="-1" />
		</tx:attributes>
	</tx:advice>
	<!-- 第三步：配置切面 切面即把增强用在方法的过程 -->
	<aop:config>
		<!-- 切入点 -->
		<aop:pointcut expression="execution(* cn.itcast.service.OrdersService.*(..))"
			id="pointcut1" />
		<!-- 切面 -->
		<aop:advisor advice-ref="txadvice" pointcut-ref="pointcut1" />
	</aop:config>
	<!-- 对象生成及属性注入 -->
	<bean id="ordersService" class="cn.itcast.service.OrdersService">
		<property name="ordersDao" ref="ordersDao"></property>
	</bean>
	<bean id="ordersDao" class="cn.itcast.dao.OrdersDao">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
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(3) Annotation-based way

OrdersService.java (business logic layer)

package cn.itcast.service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import cn.itcast.dao.OrdersDao;
@Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT, readOnly = false, timeout = -1)
public class OrdersService {
	private OrdersDao ordersDao;
	public void setOrdersDao(OrdersDao ordersDao) {
		this.ordersDao = ordersDao;
	}
	// 调用dao的方法
	// 业务逻辑，写转账业务
	public void accountMoney() {
		// 小马多1000
		ordersDao.addMoney();
		// 加入出现异常如下面int i=10/0（银行中可能为突然停电等。。。）；结果：小马账户多了1000而小王账户没有少钱
		// 解决办法是出现异常后进行事务回滚
		// int i = 10 / 0;// 事务管理配置后异常已经解决
		// 小王 少1000
		ordersDao.reduceMoney();
	}
}
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Profiles:

	<!-- 配置c3po连接池 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<!-- 注入属性值 -->
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/wangyiyun"></property>
		<property name="user" value="root"></property>
		<property name="password" value="153963"></property>
	</bean>
	<!-- 第一步：配置事务管理器 (和配置文件方式一样)-->
	<bean id="dataSourceTransactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 注入dataSource -->
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<!-- 第二步： 开启事务注解 -->
	<tx:annotation-driven transaction-manager="dataSourceTransactionManager" />
	<!-- 第三步 在方法所在类上加注解 -->
	
	
	<!-- 对象生成及属性注入 -->
	<bean id="ordersService" class="cn.itcast.service.OrdersService">
		<property name="ordersDao" ref="ordersDao"></property>
	</bean>
	<bean id="ordersDao" class="cn.itcast.dao.OrdersDao">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
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