spring声明式事务以及配置

 

使用spring提供的事务处理机制的好处是程序员可以不用关心事务的切面了,只要配置就好了,可以少写代码。

 

spring声明式事务处理

   spring

   声明:针对的是程序员,程序员告诉spring容器,哪些方法需要事务,哪些方法不需要事务

   事务处理   spring容器来做事务处理

目的:让spring管理事务,开发者不再关注事务

 

 

spring声明式事务处理的步骤:

   1、搭建环境

   2、把dao层和service层的接口和类写完

   3、在spring的配置文件中,先导入dataSource

   4、测试

   5、导入daoservice层的bean

   6、测试

   7、进行AOP的配置

       1、引入事务管理器

       2、进行aop的配置

   8、测试service层的类看是否是代理对象

 

 

例子

Person.java

 1 package cn.itcast.spring.jdbc.transaction;
 2 
 3 public class Person {
 4     private Long pid;
 5     private String pname;
 6     private String psex;
 7     public Long getPid() {
 8         return pid;
 9     }
10     public void setPid(Long pid) {
11         this.pid = pid;
12     }
13     public String getPname() {
14         return pname;
15     }
16     public void setPname(String pname) {
17         this.pname = pname;
18     }
19     public String getPsex() {
20         return psex;
21     }
22     public void setPsex(String psex) {
23         this.psex = psex;
24     }
25     
26 }
View Code

MyPersonDao.java

1 package cn.itcast.spring.jdbc.transaction;
2 import org.springframework.jdbc.core.support.JdbcDaoSupport;
3 public class MyPersonDao extends JdbcDaoSupport{    
4     public void savePerson()
5     {
6         this.getJdbcTemplate().execute("insert into person(pname,psex) values('bbbbbb','aaaa')");
7         int i=1/0;
8     }
9 }

PersonService.java

 1 package cn.itcast.spring.jdbc.transaction;
 2 
 3 import cn.itcast.spring.jdbc.PersonDao;
 4 
 5 public class PersonService {
 6     private MyPersonDao dao=new MyPersonDao();
 7     
 8     public MyPersonDao getDao() {
 9         return dao;
10     }
11 
12     public void setDao(MyPersonDao dao) {
13         this.dao = dao;
14     }
15 
16     public void savePerson()
17     {
18         dao.savePerson();
19 
20     }
21 }

MyException.java

1 package cn.itcast.spring.jdbc.transaction;
2 
3 public class MyException {
4     public void defineException(Throwable ex){
5         System.out.println(ex.getMessage());
6     }
7     
8 }

jdbc.properties

1 jdbc.driverClassName=com.mysql.jdbc.Driver
2 jdbc.url=jdbc\:mysql\://localhost\:3306/hibernate_basic
3 jdbc.username=root
4 jdbc.password=friends
View Code

重点 applicationContext-spring_jdbc_transaction.xml

 1 <beans xmlns="http://www.springframework.org/schema/beans"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
 3     xmlns:tx="http://www.springframework.org/schema/tx"
 4     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 5         http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 6         http://www.springframework.org/schema/aop 
 7         http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
 8         http://www.springframework.org/schema/tx 
 9         http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
10     <bean
11         class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
12         <property name="locations">
13             <value>classpath:jdbc.properties</value>
14         </property>
15     </bean>
16 
17 
18     <bean id="dataSource" destroy-method="close"
19         class="org.apache.commons.dbcp.BasicDataSource">
20         <property name="driverClassName" value="${jdbc.driverClassName}" />
21         <property name="url" value="${jdbc.url}" />
22         <property name="username" value="${jdbc.username}" />
23         <property name="password" value="${jdbc.password}" />
24     </bean>
25 
26     <bean id="personDao" class="cn.itcast.spring.jdbc.transaction.MyPersonDao">
27         <property name="dataSource">
28             <ref bean="dataSource" />
29         </property>
30     </bean>
31     <bean id="serviceDao" class="cn.itcast.spring.jdbc.transaction.PersonService">
32         <property name="dao">
33             <ref bean="personDao"/>
34         </property>
35     </bean>
36     
37     <bean id="myException" class="cn.itcast.spring.jdbc.transaction.MyException"></bean>
38 <!--     spring提供的事务管理器, -->
39     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
40         <property name="dataSource">
41             <ref bean="dataSource"/>
42         </property>
43     </bean>
44     <!--
45         通知 1、告诉spring容器,采用什么样的方法处理事务 2、告诉spring容器,目标方法应该采用什么样的事务处理策略
46     -->
47     <tx:advice id="tx" transaction-manager="transactionManager">
48         <tx:attributes>
49             <!--
50                 save开头的函数名 name规定方法 isolation 默认值为DEFAULT propagation 传播机制 REQUIRED
51             -->
52             <tx:method name="save*" read-only="false" />
53         </tx:attributes>
54     </tx:advice>
55 <!--     本来事务由程序员自己写并且当切面放入,但是这里spring提供了事务处理的通知方法,所以不用程序员写切面了 -->
56     <aop:config >
57         <aop:pointcut expression="execution(* cn.itcast.spring.jdbc.transaction.PersonService.*(..))" id="perform"/>
58         <aop:advisor advice-ref="tx" pointcut-ref="perform" />
59 <!--         指定了切面和通知 -->
60         <aop:aspect  ref="myException">
61             <aop:after-throwing method="defineException" pointcut-ref="perform" throwing="ex"/>
62         </aop:aspect>
63     </aop:config>
64 </beans>

测试

 1 package cn.itcast.spring.jdbc.transaction;
 2 
 3 import org.junit.Test;
 4 import org.springframework.context.ApplicationContext;
 5 import org.springframework.context.support.ClassPathXmlApplicationContext;
 6 
 7 import cn.itcast.spring.jdbc.PersonDao;
 8 import cn.itcast.spring.jdbc.PersonDao2;
 9 import cn.itcast.spring.jdbc.PersonDao3;
10 
11 public class test {
12     @Test
13     public void testPersonDao1()
14     {
15         ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext-spring_jdbc_transaction.xml");
16         PersonService dao=(PersonService) context.getBean("serviceDao");
17         dao.savePerson();
18     }
19     
20 }

 

posted on 2014-06-13 18:34  wf110  阅读(2280)  评论(0编辑  收藏  举报