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