環境與版本
本文出來之前的一篇文章中的hibernate的相關lib 外
Java事務管理之Hibernate
還需要加入spring的lib 包和如下的一些依賴包
org.aopalliance
org.aspectj
org.apache.commons
Spring 的版本是Spring 4.1.5。
依賴包也可以到Spring 官方網站下載到 ,名字類似 spring-framework-3.0.2.RELEASE-dependencies
理論知識
Spring和Hibernate整合后,通過Hibernate API進行數據庫操作時發現每次都要opensession,close,beginTransaction,commit,這些都是重復的工作,我們可以把事務管理部分交給spring框架完成。
使用spring管理事務后在dao中不再需要調用beginTransaction和commit,也不需要調用session.close()
,使用API sessionFactory.getCurrentSession()
來替代sessionFactory.openSession()
* 如果使用的是本地事務(jdbc事務)
<property name="hibernate.current_session_context_class">thread</property>
* 如果使用的是全局事務(jta事務)
<property name="hibernate.current_session_context_class">jta</property>
Spring中Propagation類的事務屬性詳解:
PROPAGATION_REQUIRED:支持當前事務,如果當前沒有事務,就新建一個事務。這是最常見的選擇。
PROPAGATION_SUPPORTS:支持當前事務,如果當前沒有事務,就以非事務方式執行。
PROPAGATION_MANDATORY:支持當前事務,如果當前沒有事務,就拋出異常。
PROPAGATION_REQUIRES_NEW:新建事務,如果當前存在事務,把當前事務掛起。
PROPAGATION_NOT_SUPPORTED:以非事務方式執行操作,如果當前存在事務,就把當前事務掛起。
PROPAGATION_NEVER:以非事務方式執行,如果當前存在事務,則拋出異常。
PROPAGATION_NESTED:支持當前事務,如果當前事務存在,則執行一個嵌套事務,如果當前沒有事務,就新建一個事務。
Spring 可以使用xml方式進行配置或是使用注解聲明的方式進行事務的管理。
xml 方式配置事務代碼實例
代碼結構如下:
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 > |
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 |
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; } } |
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; } } |
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); } } |
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(); } } |
說明如下:
get 可以不需要transaction
插入或是更新如果沒有的話, 就不會更新成功
聲明方式配置事務
需要在xml配制中設置<tx:annotation-driven transaction-manager="transactionManager">
事物注解方式: @Transactional
當標于類前時,標示類中所有方法都進行事物處理,以下代碼在service層進行事務處理(給Service層配置事務是比較好的方式,因為一個Service層方法操作可以關聯到多個DAO的操作。在Service層執行這些Dao操作,多DAO操作有失敗全部回滾,成功則全部提交。)
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@Service @Transactional public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; public User getUserById( int id) { return userDao.findUserById(id); } } |
當類中某些方法不需要事物時:
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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); } |
總結
以上就是這篇文章的全部內容了,希望本文的內容對大家學習或者使用java能帶來一定的幫助,如果有疑問大家可以留言交流,謝謝大家對服務器之家的支持。
原文鏈接:http://blog.csdn.net/oscar999/article/details/55261446