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Spring入门第二十八课
事务的传播行为
当事务方法被另一个事务方法调用时，必须指定事务应该如何传播，例如：方法可能继续在现有事务中运行，也可能开启一个新的事务，并在自己的事务中运行。
事务的传播行为可以由传播属性指定.Spring定义了7中类型的传播行为。
默认的传播行为是REQUIRED
直接看代码：
db.properties
jdbc.user=rootjdbc.password=logan123jdbc.driverClass=com.mysql.jdbc.Driverjdbc.jdbcUrl=jdbc:mysql://localhost:3306/springjdbc.initPoolSize=5jdbc.maxPoolSize=10<?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:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"> <context:component-scan base-package="logan.study.spring.tx"></context:component-scan> <!-- 导入资源文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 配置C3P0数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property> <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property> </bean> <!-- 配置Spring的JDBCTemplate --> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置NamedParameterJdbcTemplate,该对象可以使用具名参数，其没有无参的构造器，所以必须为其构造器指定参数 --> <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate"> <constructor-arg ref="dataSource"></constructor-arg> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 启用事务注解 --> <tx:annotation-driven transaction-manager="transactionManager"/></beans>
package logan.study.spring.tx;public class UserAccountException extends RuntimeException{ public UserAccountException() { super(); // TODO Auto-generated constructor stub } public UserAccountException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) { super(message, cause, enableSuppression, writableStackTrace); // TODO Auto-generated constructor stub } public UserAccountException(String message, Throwable cause) { super(message, cause); // TODO Auto-generated constructor stub } public UserAccountException(String message) { super(message); // TODO Auto-generated constructor stub } public UserAccountException(Throwable cause) { super(cause); // TODO Auto-generated constructor stub } }
package logan.study.spring.tx;public class BookStockException extends RuntimeException{ public BookStockException() { super(); // TODO Auto-generated constructor stub } public BookStockException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) { super(message, cause, enableSuppression, writableStackTrace); // TODO Auto-generated constructor stub } public BookStockException(String message, Throwable cause) { super(message, cause); // TODO Auto-generated constructor stub } public BookStockException(String message) { super(message); // TODO Auto-generated constructor stub } public BookStockException(Throwable cause) { super(cause); // TODO Auto-generated constructor stub } }
package logan.study.spring.tx;public interface BookShopService { public void purchase(String username, String isbn);}
package logan.study.spring.tx;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;@Service("bookShopService")public class BookShopServiceImpl implements BookShopService { @Autowired private BookShopDao bookShopDao; //添加事务注解 @Transactional @Override public void purchase(String username, String isbn) { // TODO Auto-generated method stub //1.获取书的单价 int price = bookShopDao.findBookPriceIsbn(isbn); //2.更新书的库存 bookShopDao.updateBookStock(isbn); //3.更新用户余额 bookShopDao.updateUserAccount(username, price); }}
package logan.study.spring.tx;import java.util.List;public interface Cashier { public void checkout(String username,List<String> isbns);}
package logan.study.spring.tx;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Propagation;import org.springframework.transaction.annotation.Transactional;@Service("cashier")public class CashierImpl implements Cashier{ @Autowired private BookShopService bookShopService; /** * 使用propagation指定事务的传播行为，即当前的事务方法被另外一个事务方法调用时 * 如何使用事务，默认取值为REQUIRED，即使用调用方法的事务 * REQUIRES_NEW事务自己的事务，调用事务方法的事务被挂起 */ @Transactional(propagation=Propagation.REQUIRES_NEW) @Override public void checkout(String username, List<String> isbns) { // TODO Auto-generated method stub for(String isbn:isbns){ bookShopService.purchase(username, isbn); } }}
package logan.study.spring.tx;import static org.junit.Assert.*;import java.util.Arrays;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.jdbc.core.JdbcTemplate;public class SpringTransactionTest { private ApplicationContext ctx = null; private BookShopDao bookShopDao = null; private BookShopService bookShopService = null; private Cashier cashier = null; { ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); bookShopDao = ctx.getBean(BookShopDao.class); bookShopService = ctx.getBean(BookShopService.class); cashier = ctx.getBean(Cashier.class); } @Test public void testTransactionalPropagation(){ cashier.checkout("AA", Arrays.asList("1001","1002")); } @Test public void testBookShopService(){ bookShopService.purchase("AA", "1001"); } @Test public void testBookShopDaoUpdateUserAcount(){ bookShopDao.updateUserAccount("AA", 100); } @Test public void testBookShopDaoUpdateBookStock(){ bookShopDao.updateBookStock("1001"); } @Test public void testBookShopDaoFindPriceByIsbn(){ System.out.println(bookShopDao.findBookPriceIsbn("1001")); } @Test public void test() { fail("Not yet implemented"); }}
Spring入门第二十八课
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