sping 对 hibernate进行事务管理--Annotation, xml, 大多数使用XML

时间：2025-02-26 18:08:14

1. UserServiceTest.java:

package com.bjsxt.service;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection

//Inverse of Control

public class UserServiceTest {

	@Test

	public void testAdd() throws Exception {

		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");

		UserService service = (UserService)ctx.getBean("userService");

		System.out.println(service.getClass());

		User user=new User();

		user.setName("zhangsdddn");

		service.add(user);

		ctx.destroy();

	}

}

2. src下 beas.xml: 注意tx的引入, properties->XML Catalog, 引入spring-tx-2.5.xsd　　

<?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: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-2.5.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-2.5.xsd

           http://www.springframework.org/schema/aop

           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd

           http://www.springframework.org/schema/tx

           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

	<context:annotation-config />

	<context:component-scan base-package="com.bjsxt" />
	<!--

		<bean id="dataSource"

		class="org.apache.commons.dbcp.BasicDataSource"

		destroy-method="close">

		<property name="driverClassName" value="com.mysql.jdbc.Driver" />

		<property name="url" value="jdbc:mysql://localhost:3306/spring" />

		<property name="username" value="root" />

		<property name="password" value="bjsxt" />

		</bean>

	-->

	<bean

		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

		<property name="locations">

			<value>classpath:jdbc.properties</value>

		</property>

	</bean>

	<bean id="dataSource" destroy-method="close"

		class="org.apache.commons.dbcp.BasicDataSource">

		<property name="driverClassName"

			value="${jdbc.driverClassName}" />

		<property name="url" value="${jdbc.url}" />

		<property name="username" value="${jdbc.username}" />

		<property name="password" value="${jdbc.password}" />

	</bean>

	<bean id="sessionFactory"

		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

		<property name="dataSource" ref="dataSource" />

		<property name="annotatedClasses">

			<list>

				<value>com.bjsxt.model.User</value>

				<value>com.bjsxt.model.Log</value>

			</list>

		</property>

		<property name="hibernateProperties">

			<props>

				<prop key="hibernate.dialect">

					org.hibernate.dialect.MySQLDialect

				</prop>

				<prop key="hibernate.show_sql">true</prop>

			</props>

		</property>

	</bean>

	<bean id="txManager"

		class="org.springframework.orm.hibernate3.HibernateTransactionManager">

		<property name="sessionFactory" ref="sessionFactory" />

	</bean>

	<tx:annotation-driven transaction-manager="txManager"/>

</beans>

3. src下jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/spring

jdbc.username=root

jdbc.password=linda0213

4. UserService.java:

新增一个业务逻辑log, 如果加入一个user出错, 那么log也要保证回滚, 所以要通过beans.xml配置和UserService.java里的add方法上加入@Transactional, 来进行统一事务管理

Transactional有个属性propagation, 是个Enum, 默认值是REQUIRED,

@Transactional(propagation=Propagation.REQUIRED)

@Transactional(readOnly=true), 不能修改, 没有修改的时候, 可以用, 效率高

package com.bjsxt.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

import org.springframework.transaction.annotation.Propagation;

import org.springframework.transaction.annotation.Transactional;

import com.bjsxt.dao.LogDAO;

import com.bjsxt.dao.UserDAO;

import com.bjsxt.model.Log;

import com.bjsxt.model.User;

@Component("userService")

public class UserService {

	private UserDAO userDAO;

	private LogDAO logDAO;

	public void init() {

		System.out.println("init");

	}

	public User getUser(int id) {

		return null;

	}


	@Transactional

	public void add(User user) {

			userDAO.save(user);

			Log log = new Log();

			log.setMsg("a user saved!");

			logDAO.save(log);

	}

	public UserDAO getUserDAO() {

		return userDAO;

	}

	@Resource(name="u")

	public void setUserDAO( UserDAO userDAO) {

		this.userDAO = userDAO;

	}

	public LogDAO getLogDAO() {

		return logDAO;

	}

	@Resource

	public void setLogDAO(LogDAO logDAO) {

		this.logDAO = logDAO;

	}

	public void destroy() {

		System.out.println("destroy");

	}

}

UserDAOImpl.java:

去掉save里的事务处理

package com.bjsxt.dao.impl;

import java.sql.SQLException;

import javax.annotation.Resource;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.springframework.stereotype.Component;

import com.bjsxt.dao.UserDAO;

import com.bjsxt.model.User;

@Component("u")

public class UserDAOImpl implements UserDAO {

	private SessionFactory sessionFactory;

	public SessionFactory getSessionFactory() {

		return sessionFactory;

	}

	@Resource

	public void setSessionFactory(SessionFactory sessionFactory) {

		this.sessionFactory = sessionFactory;

	}

	public void save(User user) {

			Session s = sessionFactory.getCurrentSession();

			s.save(user);

		//throw new RuntimeException("exeption!");

	}

}

　　

LogDAOImpl.java:

package com.bjsxt.dao.impl;

import javax.annotation.Resource;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.springframework.stereotype.Component;

import com.bjsxt.dao.LogDAO;

import com.bjsxt.model.Log;

@Component("logDAO")

public class LogDAOImpl implements LogDAO {

	private SessionFactory sessionFactory;

	public SessionFactory getSessionFactory() {

		return sessionFactory;

	}

	@Resource

	public void setSessionFactory(SessionFactory sessionFactory) {

		this.sessionFactory = sessionFactory;

	}

	public void save(Log log) {

		Session s = sessionFactory.getCurrentSession();

		s.save(log);

		//throw new RuntimeException("error!");

	}

}

UserDAO.java:

package com.bjsxt.dao;

import com.bjsxt.model.User;

public interface UserDAO {

	public void save(User user);

}

LogDAO.java:

package com.bjsxt.dao;

import com.bjsxt.model.User;

public interface UserDAO {

	public void save(User user);

}

User.java

package com.bjsxt.model;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

@Entity

public class User {

	private int id;

	private String name;

	@Id

	@GeneratedValue

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

}

　　

Log.java:

package com.bjsxt.model;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

@Entity

public class User {

	private int id;

	private String name;

	@Id

	@GeneratedValue

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

}

　　

大多数使用xml方式, 因为不用在service每个方法上加@Transactional

xml配置的话, 只需要把service里的@Transactional去掉,

然后修改beans.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:context="http://www.springframework.org/schema/context"

	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-2.5.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-2.5.xsd

           http://www.springframework.org/schema/aop

           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd

           http://www.springframework.org/schema/tx

           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

	<context:annotation-config />

	<context:component-scan base-package="com.bjsxt" />

	<!--

		<bean id="dataSource"

		class="org.apache.commons.dbcp.BasicDataSource"

		destroy-method="close">

		<property name="driverClassName" value="com.mysql.jdbc.Driver" />

		<property name="url" value="jdbc:mysql://localhost:3306/spring" />

		<property name="username" value="root" />

		<property name="password" value="bjsxt" />

		</bean>

	-->

	<bean

		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

		<property name="locations">

			<value>classpath:jdbc.properties</value>

		</property>

	</bean>

	<bean id="dataSource" destroy-method="close"

		class="org.apache.commons.dbcp.BasicDataSource">

		<property name="driverClassName"

			value="${jdbc.driverClassName}" />

		<property name="url" value="${jdbc.url}" />

		<property name="username" value="${jdbc.username}" />

		<property name="password" value="${jdbc.password}" />

	</bean>

	<bean id="sessionFactory"

		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">

		<property name="dataSource" ref="dataSource" />

		<!--

		<property name="annotatedClasses">

			<list>

				<value>com.bjsxt.model.User</value>

				<value>com.bjsxt.model.Log</value>

			</list>

		</property>

		 -->

		 <property name="packagesToScan">

			<list>

				<value>com.bjsxt.model</value>

			</list>

		</property>

		<property name="hibernateProperties">

			<props>

				<prop key="hibernate.dialect">

					org.hibernate.dialect.MySQLDialect

				</prop>

				<prop key="hibernate.show_sql">true</prop>

			</props>

		</property>

	</bean>

	<bean id="txManager"

		class="org.springframework.orm.hibernate3.HibernateTransactionManager">

		<property name="sessionFactory" ref="sessionFactory" />

	</bean>

	<aop:config>

		<aop:pointcut id="bussinessService"

			expression="execution(public * com.bjsxt.service..*.*(..))" />

		<aop:advisor pointcut-ref="bussinessService"

			advice-ref="txAdvice" />

	</aop:config>

	<tx:advice id="txAdvice" transaction-manager="txManager">

		<tx:attributes>

			<tx:method name="getUser" read-only="true" />

			<tx:method name="add*" propagation="REQUIRED"/>

		</tx:attributes>

	</tx:advice>

</beans>

　　

<property name="annotatedClasses">

	<list>

		<value>com.bjsxt.model.User</value>

		<value>com.bjsxt.model.Log</value>

	</list>

</property>

用下面的替代:

 <property name="packagesToScan">

	<list>

		<value>com.bjsxt.model</value>

	</list>

</property>

　　

　　

　　

　　

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