详谈Spring框架之事务管理

一、编程式事务

二、声明式事务

1、基于XML的事务

1.1 Spring配置文件

1.2 业务类

和下面注解方式使用的类一样，不过是去掉了注解，我将所有的Service层放在一个包下，这样便于AOP 切入点表达式的书写

2、基于注解的事务

2.1、Sprin配置文件

2.2、业务类（Spring 在 Service 层上开启事务）

package com.zhoujian.spring.transcation;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
@Service("bookService")
public class BookServiceImpl implements BookService {
  
  @Autowired
  private BookDao dao;
 
  //这里是在指定方法上面开启事务
  @Transactional
  @Override
  public void buy(String userId, String bookId) {
    
    Integer price = dao.getBookPrice(bookId);
    
    dao.updateBookCount(bookId);
    
    dao.updateUserAccount(userId, price);
  }
 
}

2.3关于事务的属性(事务隔离级别，事务传播行为，事务异常控制，事务强制回滚时间控制，事务是否只读)

一般情况下，不需要进行手动改变事务属性，使用默认的就行

package com.zhoujian.spring.transcation;
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("batchBuy")
public class BatchBuyImpl implements BatchBuy {
  @Autowired
  private BookService service;
  
  
  
  @Transactional(propagation=Propagation.REQUIRED)
  @Override
  public void buy(String userId, List bookIds) {
    for(String bookId : bookIds){
      service.buy(userId, bookId);
    }
  }
}

3、测试类

package com.zhoujian.spring.transcation;
import java.util.Arrays;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class TranscationTest {
  private static ApplicationContext ac = null;
  private static BookDao dao = null;
  private static BookService service;
  private static BatchBuy buy;
  
  static{
    ac = new ClassPathXmlApplicationContext("bean-transcation.xml");
    dao = ac.getBean("bookDao", BookDao.class);
    service = ac.getBean("bookService", BookService.class);
    buy = ac.getBean("batchBuy", BatchBuy.class);
  }
  
  @Test
  public void test1(){
    buy.buy("001", Arrays.asList("1","2"));
  }
  
  @Test
  public void test() {
    service.buy("001", "1");
  }
}

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