Spring入门第二十八课
2024-08-29 22:51:54
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=root
jdbc.password=logan123
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/spring jdbc.initPoolSize=5
jdbc.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");
} }
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