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spring的事务管理(但数据源多数据源)

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一.单一数据源的事务管理

事务的管理有几种方式, 使用注解, 声明式配置等等.

首先,看一下单一数据源的事务配置:

<?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-3.0.xsd 
http://www.springframework.org/schema/context     
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx         
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

<!-- 扫描注解Bean -->
<context:component-scan base-package="com.tx">
</context:component-scan>

<tx:annotation-driven proxy-target-class="true"
transaction-manager="txManager" />

<context:property-placeholder location="classpath:jdbc.properties" />

<bean id="jdbctemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>



<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager" ref="txManager" />
<property name="transactionAttributes">
<props>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="insert*">PROPAGATION_REQUIRED</prop>
<prop key="update*">PROPAGATION_REQUIRED</prop>
<prop key="remove*">PROPAGATION_REQUIRED</prop>
<prop key="delete*">PROPAGATION_REQUIRED</prop>
<prop key="clear*">PROPAGATION_REQUIRED</prop>
<prop key="restore*">PROPAGATION_REQUIRED</prop>
<prop key="replace*">PROPAGATION_REQUIRED</prop>
<prop key="process*">PROPAGATION_REQUIRED</prop>
<prop key="execute*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- 设置代理类 -->
<bean id="bdf.transaction.beanNameAutoProxyCreator"
class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<property name="proxyTargetClass" value="true"></property>
<property name="beanNames" value="*PR,*BO,*Service,*Dao" />
<property name="interceptorNames">
<list>
<value>transactionInterceptor</value>
</list>
</property>
</bean>
<!-- 设置事务管理器 -->
<bean id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!--
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
基本属性 url、user、password
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
配置初始化大小、最小、最大
<property name="initialSize" value="1" />
<property name="minIdle" value="1" />
<property name="maxActive" value="20" />
配置获取连接等待超时的时间
<property name="maxWait" value="60000" />
配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
<property name="timeBetweenEvictionRunsMillis" value="60000" />
配置一个连接在池中最小生存的时间,单位是毫秒
<property name="minEvictableIdleTimeMillis" value="300000" />
<property name="validationQuery" value="SELECT * from user" />
<property name="testWhileIdle" value="true" />
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />
打开PSCache,并且指定每个连接上PSCache的大小
<property name="poolPreparedStatements" value="true" />
<property name="maxPoolPreparedStatementPerConnectionSize"
value="20" />
配置监控统计拦截的filters
<property name="filters" value="stat" />
</bean> -->

<!-- 配置数据源,c3p0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
<property name="driverClass" value="${jdbc.driver}" />
<property name="jdbcUrl" value="${jdbc.url}" />
<property name="user" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
</beans> 
其中transactionInterceptor中配置的拦截方法就是需要事务管理的, 满足命名条件的方法都会被事务管理所拦截.

测试:



/* Dao代码 */
public class JdbcTestDao {

@Resource(name="jdbctemplate")
JdbcTemplate jdbcTemplate;

/**
* 在配置文件中使用了声明式的事务管理,<prop key="execute*">PROPAGATION_REQUIRED</prop>
* 所以这个事务是会被拦截的事务
*/
public void execute(){
jdbcTemplate.update("UPDATE user set username = 'fff1' where id=4");
jdbcTemplate.update("UPDATE user1 set username = 'eee1' where id=4");
int i = 1/0;
}

/**
* 这个虽然不是在配置文件中需要被拦截的事务,但是有注解声明
* 所以这个事务是会被拦截的事务
*/
@Transactional
public void notExtcuteWithTx(){
jdbcTemplate.update("UPDATE user set username = 'ggg' where id=4");
jdbcTemplate.update("UPDATE user1 set username = 'hhh' where id=4");
int i = 1/0;
}

/**
* 不会被拦截的事务
*/
public void notExtcute(){
jdbcTemplate.update("UPDATE user set username = 'iii' where id=4");
jdbcTemplate.update("UPDATE user1 set username = 'jjjj' where id=4");
int i = 1/0;
}
}
/* jUnit代码 */
public class JdbcTestDaoTest {
ApplicationContext context;

@Before
public void before() {
context = new ClassPathXmlApplicationContext("spring-jdbc.xml");
}

@Test
public void execute() {
JdbcTestDao dao = context.getBean(JdbcTestDao.class);
dao.execute();
}
@Test
public void notExtcuteWithTx() {
JdbcTestDao dao = context.getBean(JdbcTestDao.class);
dao.notExtcuteWithTx();
}
@Test
public void notExtcute() {
JdbcTestDao dao = context.getBean(JdbcTestDao.class);
dao.notExtcute();
}
}
分别单元测试三个方法, 可以得到正确的结果, 当抛出异常的时候, 事务都会回滚.





二.多数据源的事务管理

    在spring中, 提供了很多事务管理的接口, DataSourceTransactionManager, JpaTransactionManager,  JtaTransactionManager等等. 其中JtaTransactionManager是专门用来管理多数据源, 提供了对分布式事务的支持.

<!-- JTA分布式事务配置 -->
<?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-3.0.xsd 
http://www.springframework.org/schema/context      http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx           http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

<!-- 扫描注解Bean -->
<context:component-scan base-package="com.tx">
</context:component-scan>
<tx:annotation-driven proxy-target-class="true"
transaction-manager="transactionManager" />
<bean id="jdbctemplate1" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource1" />
</bean>

<bean id="jdbctemplate2" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource2" />
</bean>

<bean id="dataSource1" class="com.atomikos.jdbc.AtomikosDataSourceBean"
init-method="init" destroy-method="close">
<property name="uniqueResourceName" value="mysql1" />
<property name="xaDataSourceClassName"
value="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource" />
<property name="xaProperties">
<props>
<prop key="url">jdbc:mysql://localhost:3306/chatroom?useUnicode=true&amp;characterEncoding=utf8
</prop>
<prop key="user">root</prop>
<prop key="password">123456</prop>
<!-- <prop key="initialSize">1</prop> <prop key="minIdle">1</prop> <prop
key="maxActive">20</prop> -->
</props>
</property>
<property name="minPoolSize" value="10" />
<property name="maxPoolSize" value="100" />
<property name="borrowConnectionTimeout" value="30" />
<property name="testQuery" value="select 1" />
<property name="maintenanceInterval" value="60" />
</bean>

<bean id="dataSource2" class="com.atomikos.jdbc.AtomikosDataSourceBean"
init-method="init" destroy-method="close">
<property name="uniqueResourceName" value="mysql2" />
<property name="xaDataSourceClassName"
value="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource" />
<property name="xaProperties">
<props>
<prop key="url">jdbc:mysql://localhost:3306/cms?useUnicode=true&amp;characterEncoding=utf8
</prop>
<prop key="user">root</prop>
<prop key="password">123456</prop>
<!-- <prop key="initialSize">1</prop> <prop key="minIdle">1</prop> <prop
key="maxActive">20</prop> -->
</props>
</property>
<property name="minPoolSize" value="10" />
<property name="maxPoolSize" value="100" />
<property name="borrowConnectionTimeout" value="30" />
<property name="testQuery" value="select 1" />
<property name="maintenanceInterval" value="60" />
</bean>

<!-- 设置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="transactionManager">
<bean class="com.atomikos.icatch.jta.UserTransactionManager"
init-method="init" destroy-method="close">
<property name="forceShutdown" value="true" />
</bean>
</property>
<property name="userTransaction">
<bean class="com.atomikos.icatch.jta.UserTransactionImp">
<property name="transactionTimeout" value="300" />
</bean>
</property>
</bean>


<bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
<property name="transactionManager" ref="transactionManager" />
<property name="transactionAttributes">
<props>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="insert*">PROPAGATION_REQUIRED</prop>
<prop key="update*">PROPAGATION_REQUIRED</prop>
<prop key="remove*">PROPAGATION_REQUIRED</prop>
<prop key="delete*">PROPAGATION_REQUIRED</prop>
<prop key="clear*">PROPAGATION_REQUIRED</prop>
<prop key="restore*">PROPAGATION_REQUIRED</prop>
<prop key="replace*">PROPAGATION_REQUIRED</prop>
<prop key="process*">PROPAGATION_REQUIRED</prop>
<prop key="execute*">PROPAGATION_REQUIRED</prop>
</props>
</property>
</bean>
<!-- 设置代理类 -->
<bean id="transactionBeanNameAutoProxyCreator"
class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
<property name="proxyTargetClass" value="true"></property>
<property name="beanNames" value="*PR,*BO,*Service,*Dao" />
<property name="interceptorNames">
<list>
<value>transactionInterceptor</value>
</list>
</property>
</bean>
</beans> 
    这里,使用的都是mysql, 只是数据库不同, 也可以使用多种数据库,可替换为oracle等.

    测试:

   

/* Dao代码 */
@Component
public class JtaTestDao implements ApplicationContextAware ,InitializingBean{
private ApplicationContext context;

public void execute() {
JdbcTemplate chatroom = context.getBean("jdbctemplate1",
JdbcTemplate.class);
JdbcTemplate cms = context.getBean("jdbctemplate2",
JdbcTemplate.class);
chatroom.update("UPDATE user set username = 'lzxfgw' where id=4");
cms.update("INSERT INTO c_user (id, login_name, password) values (100, 'fgw', '123')");

}

//@PostConstruct
    //实现ApplicationContextAware接口, 可以在初始化的时候注入applicationContext
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
this.context = applicationContext;
}

@Override
public void afterPropertiesSet() throws Exception {
}
}
/* jUnit代码 */
public class JtaTestDaoTest {
ApplicationContext context;

@Test
public void test() {
JtaTestDao t = context.getBean(JtaTestDao.class);
t.execute();
}

@Before
public void before() {
context = new ClassPathXmlApplicationContext("spring-jta.xml");
}
}
    运行jUnit第一次是没有问题的, 修改一下dao代码中的username再次运行,会抛出主键重复的异常, 可以看到数据库中的第一条update语句的username也没有改变, 说明事务在抛出异常之后正常回滚了.
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