Jotm+Spring + Hibernate+ SQL2005 实现DAO数据访问JTA分布式事务

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#Hibernate #DAO #Spring #Bean #AOP

本文介绍了一个使用Spring框架和JTA技术实现的分布式跨库事务案例。通过配置Spring Bean及使用Hibernate进行数据持久化，实现了在两个不同的数据库间进行的数据转移，并确保了事务的一致性和原子性。

两台不同的数据库上完成分布式跨库事务

1 Spring配置文件，jotm-applicationContext-db.xml

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

	<bean id="placeholderConfig"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="location">
			<value>classpath:jotm-db.properties
			</value>
		</property>
	</bean>

	<bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean" />

	<bean id="localDatasource" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
		destroy-method="shutdown">
		<property name="dataSource">
			<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
				destroy-method="shutdown">
				<property name="transactionManager">
					<ref local="jotm" />
				</property>
				<property name="driverName" value="${db.driverClassName}" />
				<property name="url" value="${db.url}:${db.port};DatabaseName=LOCAL" />
				<property name="user" value="${db.username}" />
				<property name="password" value="${db.password}" />
			</bean>
		</property>
		<property name="user" value="${db.username}" />
		<property name="password" value="${db.password}" />
		<property name="minSize" value="1" />
		<property name="maxSize" value="5" />
		<property name="checkLevelObject" value="4" />
		<property name="jdbcTestStmt" value="select 1" />
	</bean>

	<bean id="foreignDatasource" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource"
		destroy-method="shutdown">
		<property name="dataSource">
			<bean class="org.enhydra.jdbc.standard.StandardXADataSource"
				destroy-method="shutdown">
				<property name="transactionManager">
					<ref local="jotm" />
				</property>
				<property name="driverName" value="${db.foreign.driverClassName}" />
				<property name="url"
					value="${db.foreign.url}:${db.foreign.port};DatabaseName=${db.name.foreign}" />
				<property name="user" value="${db.foreign.username}" />
				<property name="password" value="${db.foreign.password}" />
			</bean>
		</property>
		<property name="user" value="${db.foreign.username}" />
		<property name="password" value="${db.foreign.password}" />
		<property name="minSize" value="1" />
		<property name="maxSize" value="5" />
		<property name="checkLevelObject" value="4" />
		<property name="jdbcTestStmt" value="select 1" />
	</bean>

	<bean id="local_sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource">
			<ref local="localDatasource" />
		</property>
		<property name="mappingLocations">
			<list>
				<value>classpath:edu/dlut/nihao/**/*.hbm.xml
				</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.SQLServerDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>

	</bean>

	<bean id="foreign_sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource">
			<ref local="foreignDatasource" />
		</property>
		<property name="mappingLocations">
			<list>
				<value>classpath:edu/dlut/nihao/**/*.hbm.xml
				</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.SQLServerDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>

	</bean>

	<bean id="local_personDAO" class="edu.dlut.nihao.lvhl.domain.PersonDAO">
		<property name="sessionFactory">
			<ref bean="local_sessionFactory" />
		</property>
	</bean>

	<bean id="foreign_personDAO" class="edu.dlut.nihao.lvhl.domain.PersonDAO">
		<property name="sessionFactory">
			<ref bean="foreign_sessionFactory" />
		</property>
	</bean>

	<bean id="personDS" class="edu.dlut.nihao.lvhl.domain.PersonDS">
		<property name="foreignDAO" ref="foreign_personDAO"></property>
		<property name="localDAO" ref="local_personDAO"></property>
	</bean>

	<bean id="jotmTransactionManager"
		class="org.springframework.transaction.jta.JtaTransactionManager">
		<property name="userTransaction">
			<ref local="jotm" />
		</property>
		<property name="nestedTransactionAllowed" value="true" />
	</bean>

	<bean id="jotmTxAttributeSource"
		class="org.springframework.transaction.interceptor.NameMatchTransactionAttributeSource">
		<property name="properties">
			<props>
				<prop key="transferPerson">PROPAGATION_REQUIRED</prop>
			</props>
		</property>
	</bean>

	<bean id="jotmAutoproxy"
		class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
		<property name="beanNames">
			<value>personDS</value>
		</property>
		<property name="interceptorNames">
			<list>
				<value>jotmTransactionInterceptor</value>
			</list>
		</property>
	</bean>

	<bean id="jotmTransactionInterceptor"
		class="org.springframework.transaction.interceptor.TransactionInterceptor">
		<property name="transactionManager" ref="jotmTransactionManager" />
		<property name="transactionAttributeSource" ref="jotmTxAttributeSource" />
	</bean>

</beans>

2 数据库属性文件，jotm-db.properties，Local和Foreign两个部署在不同服务器上的数据库实例。

#Created by JInto - www.guh-software.de
#Wed Aug 25 16:36:01 CST 2010
db.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
db.password=1234
db.port=1433
db.url=jdbc\:sqlserver\://10.87.40.148
db.username=sa
db.name.local=LOCAL
db.name.foreign=FOREIGN
db.foreign.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
db.foreign.port=1433
db.foreign.url=jdbc\:sqlserver\://10.87.40.149
db.foreign.username=sa
db.foreign.password=000000

3 hibernate映射文件Person.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="edu.dlut.nihao.lvhl.domain">

	<class name="edu.dlut.nihao.lvhl.domain.Person" table="Person"
		select-before-update="false" dynamic-update="false" dynamic-insert="false"
		optimistic-lock="version">

		<id name="id" column="Id" type="java.lang.Long" length="19">
			<generator class="assigned"></generator>
		</id>

		<property name="name" type="java.lang.String" update="true"
			insert="true" access="property" column="Name" length="50" not-null="false" />
	</class>
</hibernate-mapping>

4 数据库表均为Person，定义为：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Person](
	[Id] [bigint] NOT NULL,
	[Name] [varchar](50) NULL,
 CONSTRAINT [PK_Person] PRIMARY KEY CLUSTERED 
(
	[Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF

5 数据访问层DAO由两个组件构成，接口IPersonDAO和实现类PersonDAO

IPersonDAO.java

package edu.dlut.nihao.lvhl.domain;

public interface IPersonDAO {
	void insertPerson(Object person);

	void remove(Object person);
}

PersonDAO.java

package edu.dlut.nihao.lvhl.domain;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class PersonDAO extends HibernateDaoSupport implements IPersonDAO {

	public void insertPerson(Object person) {
		getHibernateTemplate().save(person);
	}

	public void remove(Object person) {

		getHibernateTemplate().delete(person);
	}
}

6 实体类 Person.java

package edu.dlut.nihao.lvhl.domain;

public class Person {
	private Long id;
	private String name;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
}

7 要跨库的业务，以DS为后缀，由接口IPersonDS和实现类PersonDS组成

IPersonDS.java

package edu.dlut.nihao.lvhl.domain;

public interface IPersonDS {
	void transferPerson(Person person) throws Exception;
}

PersonDS.java

package edu.dlut.nihao.lvhl.domain;

public class PersonDS implements IPersonDS {
	private IPersonDAO localDAO;
	private IPersonDAO foreignDAO;

	public void transferPerson(Person person) throws Exception {
		localDAO.remove(person);
		foreignDAO.insertPerson(person);
	//	ExceptionUtil.exceptionOccur();
	}

	public IPersonDAO getLocalDAO() {
		return localDAO;
	}

	public void setLocalDAO(IPersonDAO localDAO) {
		this.localDAO = localDAO;
	}

	public IPersonDAO getForeignDAO() {
		return foreignDAO;
	}

	public void setForeignDAO(IPersonDAO foreignDAO) {
		this.foreignDAO = foreignDAO;
	}

}

其中 ExceptionUtil.exceptionOccur();

该行代码在运行时抛出数组越界异常，用来测试事务的回滚。

ExceptionUtil.java

package edu.dlut.nihao.lvhl.domain;

public final class ExceptionUtil {
	public static void exceptionOccur() {
		int[] arr = new int[1];
		arr[1] = 0;
	}
}

8 加载Spring的Bean的类JotmContextFactory.java

package edu.dlut.nihao.lvhl.domain.jotm;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class JotmContextFactory {
	static ApplicationContext ctx = null;

	public static Object findService(String beanId) {

		if (ctx == null) {
			ctx = new ClassPathXmlApplicationContext(
					new String[] { "jotm-applicationContext-db.xml" });
		}

		return ctx.getBean(beanId);
	}

}

9 测试类JotmTest.java

package edu.dlut.nihao.lvhl.domain.jotm;

import edu.dlut.nihao.lvhl.domain.IPersonDAO;
import edu.dlut.nihao.lvhl.domain.IPersonDS;
import edu.dlut.nihao.lvhl.domain.Person;

public class JotmTest {
	static String PERSON_NAME = "nihao";
	static long PERSON_ID = 12;

	public static void main(String[] args) {

		IPersonDAO localDao = (IPersonDAO) JotmContextFactory
				.findService("local_personDAO");

		Person person = new Person();
		person.setName(PERSON_NAME);
		person.setId(PERSON_ID);

		localDao.insertPerson(person);

		// 测试跨库事务
		IPersonDS personDS = (IPersonDS) JotmContextFactory
				.findService("personDS");
		try {
			personDS.transferPerson(person);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
}

10 注意的地方：

10.1异常：

Exception in thread "main" java.lang.StackOverflowError
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.naming.internal.VersionHelper12.getContextClassLoader(VersionHelper12.java:158)
at com.sun.naming.internal.ResourceManager.getFactory(ResourceManager.java:339)
at javax.naming.spi.NamingManager.getURLObject(NamingManager.java:575)
at javax.naming.spi.NamingManager.getURLContext(NamingManager.java:533)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:279)
at javax.naming.InitialContext.lookup(InitialContext.java:351)
at org.hibernate.transaction.JTATransactionFactory.getUserTransaction(JTATransactionFactory.java:162)
at org.hibernate.transaction.JTATransactionFactory.getUserTransaction(JTATransactionFactory.java:172)
at org.hibernate.transaction.JTATransactionFactory.getUserTransaction(JTATransactionFactory.java:172)
at org.hibernate.transaction.JTATransactionFactory.getUserTransaction(JTATransactionFactory.java:172)

解决：

spring配置文件jotm-applicationContext-db.xml中sessionFactory项导致

原来配置：

	<bean id="local_sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource">
			<ref local="localDatasource" />
		</property>
		<property name="mappingLocations">
			<list>
				<value>classpath:edu/dlut/nihao/**/*.hbm.xml
				</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.SQLServerDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
		<property name="jtaTransactionManager">
			<ref local="jotm" />
		</property>
	</bean>

	<bean id="foreign_sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource">
			<ref local="foreignDatasource" />
		</property>
		<property name="mappingLocations">
			<list>
				<value>classpath:edu/dlut/nihao/**/*.hbm.xml
				</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.SQLServerDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
		<property name="jtaTransactionManager">
			<ref local="jotm" />
		</property>

应该删除属性jtaTransactionManager，因为在DataSource中已经配置该属性。