首页 > 代码库 > Spring——声明式的事务处理
Spring——声明式的事务处理
Spring声明式的事务管理
1、使用Annotation进行声明的事务管理
（1）此处以Hibernate声名式的事务管理
（2）事务应该加载业务逻辑层，即service层
（3）假设现在要在业务逻辑层加上日志逻辑
a) 建立实体类Log,使用Hibernate的Annotation，指定id:
package com.zgy.model;
import javax.persistence.Entity;
import javax.persistence.Id;
@Entity
public class Log {
private int id;
private String msg;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
@Id
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
b) 定义LogDAO：
package com.zgy.dao;
import com.zgy.model.Log;
public interface LogDAO {
public void saveLog(Log log);
}
c) 定义LogDAO的实现LogDAOImpl:
package com.zgy.impl;
import javax.annotation.Resource;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Component;
import com.zgy.dao.LogDAO;
import com.zgy.model.Log;
@Component("logDAO")
public class LogDAOImpl implements LogDAO {
private SessionFactory sessionFactory;
public SessionFactory getSessionFactory() {
return sessionFactory;
}
@Resource(name="sessionFactory")
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Override
public void saveLog(Log log) {
Session s = sessionFactory.getCurrentSession();
s.save(log);
//throw new RuntimeException("error");
}
}
d) 在原来的业务逻辑上加上日志的逻辑：
package com.zgy.service;
import javax.annotation.Resource;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import com.zgy.dao.LogDAO;
import com.zgy.dao.UserDAO;
import com.zgy.model.Log;
import com.zgy.model.User;
@Component("userService")
public class UserService {
private UserDAO userDAO;
private LogDAO logDAO;
//声明式的事务处理
@Transactional
public void add(User user) {
userDAO.save(user);
Log log = new Log();
log.setMsg("a user saved");
logDAO.saveLog(log);
}
public UserDAO getUserDAO() {
return userDAO;
}
@Resource(name="u")
public void setUserDAO( UserDAO userDAO) {
this.userDAO = userDAO;
}
public LogDAO getLogDAO() {
return logDAO;
}
@Resource(name="logDAO")
public void setLogDAO(LogDAO logDAO) {
this.logDAO = logDAO;
}
}
e) 配置文件如下：
配置文件jdbc.properties定义连接数据库所需的相关信息
dataSource注入sessionFactory
sessionFactory注入txManager
<?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.zgy" />
<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.zgy.model.User</value>
<value>com.zgy.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"></property>
</bean>
<tx:annotation-driven transaction-manager="txManager"/>
</beans>
f) 取消被注释的代码，事务提交将出现异常，事务将自动回滚，而不会将数据插入数据库。
2、使用XML方式进行声明事务管理
<?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.zgy" />
<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" />
<!-- 配置packagesToScan，自动扫描对应package下的文件 -->
<property name="packagesToScan">
<list>
<value>com.zgy.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"></property>
</bean>
<aop:config>
<aop:pointcut id="businessService" expression="execution(public * com.zgy.service..*.*(..))" />
<aop:advisor pointcut-ref="businessService" advice-ref="txAdvice"/>
</aop:config>
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="get*" read-only="true"/>
<tx:method name="add*" read-only="false" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
</beans>
Spring——声明式的事务处理