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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
<? 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
1
2
3
4
|
jdbc.driver=oracle.jdbc.driver.OracleDriver jdbc.url=jdbc:oracle:thin: @12 .6. 18.43 : 1521 :orcl jdbc.username= jdbc.password=oracle |
Product.Java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/** * @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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
/** * @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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
/** * @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(); } } |
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。)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
@Service @Transactional public class UserServiceImpl implements UserService { @Autowired private UserDao userDao; public User getUserById( int id) { return userDao.findUserById(id); } } |
当类中某些方法不需要事物时:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
@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); } |
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