环境与版本
本文出来之前的一篇文章中的hibernate的相关lib 外
Java事务管理之Hibernate
还需要加入spring的lib 包和如下的一些依赖包
org.aopalliance
org.aspectj
org.apache.commons
Spring 的版本是Spring 4.1.5。
依赖包也可以到Spring 官方网站下载到 ,名字类似 spring-framework-3.0.2.RELEASE-dependencies
理论知识
Spring和Hibernate整合后,通过Hibernate API进行数据库操作时发现每次都要opensession,close,beginTransaction,commit,这些都是重复的工作,我们可以把事务管理部分交给spring框架完成。
使用spring管理事务后在dao中不再需要调用beginTransaction和commit,也不需要调用session.close()
,使用API sessionFactory.getCurrentSession()
来替代sessionFactory.openSession()
* 如果使用的是本地事务(jdbc事务)
<property name="hibernate.current_session_context_class">thread</property>
* 如果使用的是全局事务(jta事务)
<property name="hibernate.current_session_context_class">jta</property>
Spring中Propagation类的事务属性详解:
PROPAGATION_REQUIRED:支持当前事务,如果当前没有事务,就新建一个事务。这是最常见的选择。
PROPAGATION_SUPPORTS:支持当前事务,如果当前没有事务,就以非事务方式执行。
PROPAGATION_MANDATORY:支持当前事务,如果当前没有事务,就抛出异常。
PROPAGATION_REQUIRES_NEW:新建事务,如果当前存在事务,把当前事务挂起。
PROPAGATION_NOT_SUPPORTED:以非事务方式执行操作,如果当前存在事务,就把当前事务挂起。
PROPAGATION_NEVER:以非事务方式执行,如果当前存在事务,则抛出异常。
PROPAGATION_NESTED:支持当前事务,如果当前事务存在,则执行一个嵌套事务,如果当前没有事务,就新建一个事务。
Spring 可以使用xml方式进行配置或是使用注解声明的方式进行事务的管理。
xml 方式配置事务代码实例
代码结构如下:
applicationContext.xml
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<? 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:p = "http://www.springframework.org/schema/p"
xmlns:context = "http://www.springframework.org/schema/context"
xmlns:util = "http://www.springframework.org/schema/util" xmlns:mvc = "http://www.springframework.org/schema/mvc"
xmlns:tx = "http://www.springframework.org/schema/tx"
xmlns:aop = "http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.1.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
< context:component-scan base-package = "com.oscar999.trans.sprhib" />
< context:property-placeholder location = "classpath:/com/oscar999/trans/sprhib/config.properties" />
< bean id = "dataSource" class = "org.apache.commons.dbcp.BasicDataSource"
destroy-method = "close" >
<!-- Connection Info -->
< property name = "driverClassName" value = "${jdbc.driver}" />
< property name = "url" value = "${jdbc.url}" />
< property name = "username" value = "${jdbc.username}" />
< property name = "password" value = "${jdbc.password}" ></ property >
</ bean >
< bean id = "sessionFactory"
class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean" >
< property name = "dataSource" ref = "dataSource" ></ property >
< property name = "hibernateProperties" >
< props >
< prop key = "hibernate.dialect" >org.hibernate.dialect.OracleDialect</ prop >
< prop key = "hibernate.hbm2ddl.auto" >update</ prop >
< prop key = "hibernate.show_sql" >true</ prop >
< prop key = "hibernate.format_sql" >true</ prop >
< prop key = "hibernate.jdbc.batch_size" >20</ prop >
< prop key = "hibernate.enable_lazy_load_no_trans" >true</ prop >
< prop key = "hibernate.current_session_context_class" >org.springframework.orm.hibernate4.SpringSessionContext</ prop >
< prop key = "jdbc.use_streams_for_binary" >true</ prop >
</ props >
</ property >
< property name = "packagesToScan" >
< list >
< value >com.oscar999.trans.sprhib.model</ value >
</ list >
</ property >
</ bean >
<!-- Transaction -->
< bean id = "transactionManager"
class = "org.springframework.orm.hibernate4.HibernateTransactionManager" >
< property name = "sessionFactory" ref = "sessionFactory" />
</ bean >
< tx:advice id = "txAdvice" transaction-manager = "transactionManager" >
< tx:attributes >
< tx:method name = "save*" propagation = "REQUIRED" />
< tx:method name = "*" read-only = "true" />
</ tx:attributes >
</ tx:advice >
< aop:config proxy-target-class = "true" >
< aop:pointcut expression = "execution(* com.oscar999.trans.sprhib.dao.ProductDAOImpl.*(..))" id = "pointcut" />
< aop:advisor advice-ref = "txAdvice" pointcut-ref = "pointcut" />
</ aop:config >
</ beans >
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config.properties
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jdbc.driver=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin: @12 .6. 18.43 : 1521 :orcl
jdbc.username=
jdbc.password=oracle
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Product.Java
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/**
* @Title: Product.java
* @Package com.oscar999.trans.hibernate
* @Description:
* @author XM
* @date Feb 15, 2017 1:44:47 PM
* @version V1.0
*/
package com.oscar999.trans.sprhib.model;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
/**
* @author XM
*
*/
@Entity
@Table (name = "TEST_PRODUCT" )
public class Product implements Serializable {
public Product() {
}
@Id
@Column (name = "ID" )
private Integer id;
@Column (name = "NAME" )
private String name;
@Column (name = "PRICE" )
private String price;
private static final long serialVersionUID = 1L;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this .id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this .name = name;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this .price = price;
}
}
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ProductDAOImpl.java
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/**
* @Title: ProductDAOImpl.java
* @Package com.oscar999.trans.sprhib
* @Description:
* @author XM
* @date Feb 15, 2017 4:15:09 PM
* @version V1.0
*/
package com.oscar999.trans.sprhib.dao;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.oscar999.trans.sprhib.model.Product;
/**
* @author XM
*
*/
@Repository
public class ProductDAOImpl {
@Autowired
private SessionFactory sessionFactory;
public Product findProductById( int id) {
Session session = sessionFactory.getCurrentSession();
Product product = (Product) session.get(Product. class , id);
return product;
}
public Product saveProduct(Product product) {
Session session = sessionFactory.getCurrentSession();
session.save(product);
return product;
}
}
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ProductServiceImpl.java
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package com.oscar999.trans.sprhib;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.oscar999.trans.sprhib.dao.ProductDAOImpl;
import com.oscar999.trans.sprhib.model.Product;
@Service
public class ProductServiceImpl {
@Autowired
private ProductDAOImpl productdao;
public void findProduct( int id) {
Product product = productdao.findProductById(id);
if (product != null ) {
System.out.println(product.getName());
}
}
public void saveProduct() {
Product product = new Product();
product.setId( 2 );
product.setName( "product2" );
product.setPrice( "price2" );
productdao.saveProduct(product);
}
}
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TestMain.java
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/**
* @Title: TestMain.java
* @Package com.oscar999.trans.sprhib
* @Description:
* @author XM
* @date Feb 15, 2017 3:54:54 PM
* @version V1.0
*/
package com.oscar999.trans.sprhib;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* @author XM
*
*/
public class TestMain {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext applicationContext = new ClassPathXmlApplicationContext( "com/oscar999/trans/sprhib/applicationContext.xml" );
ProductServiceImpl productService = applicationContext.getBean(ProductServiceImpl. class );
//productService.findProduct(1);
productService.saveProduct();
}
}
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说明如下:
get 可以不需要transaction
插入或是更新如果没有的话, 就不会更新成功
声明方式配置事务
需要在xml配制中设置<tx:annotation-driven transaction-manager="transactionManager">
事物注解方式: @Transactional
当标于类前时,标示类中所有方法都进行事物处理,以下代码在service层进行事务处理(给Service层配置事务是比较好的方式,因为一个Service层方法操作可以关联到多个DAO的操作。在Service层执行这些Dao操作,多DAO操作有失败全部回滚,成功则全部提交。)
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@Service
@Transactional
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
public User getUserById( int id) {
return userDao.findUserById(id);
}
}
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当类中某些方法不需要事物时:
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@Service
@Transactional
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
@Transactional (propagation = Propagation.NOT_SUPPORTED)
public User getUserById( int id) {
return userDao.findUserById(id);
}
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总结
以上就是这篇文章的全部内容了,希望本文的内容对大家学习或者使用java能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。
原文链接:http://blog.csdn.net/oscar999/article/details/55261446