spring 中的事务小结

  spring中可以使用声明式事务和编程式事务，主要用的比较多的是声明式事务，下面举例子小结一下
   首先在config.xml中定义好datasource和platformtranscationmanager
<!-- 定义DataSource -->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

..........
            </bean>

    <!-- 定义TransactionManager -->

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 定义BookDao -->

    <bean id="bookDaoTarget" class="example.chapter6.BookDaoImpl">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 封装为事务的BookDao -->

    <bean id="bookDao" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        <property name="target" ref="bookDaoTarget" />
        <property name="transactionManager" ref="transactionManager" />
        <property name="transactionAttributes">
            <props>
                <!-- 对以query开头的方法要求只读事务 -->
                <prop key="query*">PROPAGATION_REQUIRED,readOnly</prop>
                <!-- 对于其他方法要求事务 -->
                <prop key="*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>

则使用的代码例子为
ApplicationContext context = new ClassPathXmlApplicationContext("config.xml");
        BookDao bookDao = (BookDao)context.getBean("bookDao");
.....//之后的就是
try
{

}catch {}结构，程序中不需要再有处理事务方面的代码了。

    另外，在JAVA 5中，可以用注释来更简单的配置，但要注意的是，必须使用spring 2.0才行
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"
>
  。。。。。。其他的和上面的相同，最后加上
<!-- 将所有具有@Transactional注解的Bean自动配置为声明式事务支持 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

然后，对接口使用注释
import org.springframework.transaction.annotation.Transactional;

@Transactional
public interface BookDao {

    @Transactional(readOnly=true)
    Book query(String id);

    @Transactional(readOnly=true)
    List<Book> queryAll();

    void insert(Book book);

    void update(Book book);

    void delete(Book book);

}
要注意的是，@transcational的注释只能应用到public方法上

2 集成hiberante事务
   比如用hibernatedaosupport支持DAO，使用spring 2.0的注解,比如

bookdao.java
import org.springframework.transaction.annotation.Transactional;

@Transactional
public interface BookDao {

    @Transactional(readOnly=true)
    Book query(String id);

    @Transactional(readOnly=true)
    List<Book> queryAll();

    void insert(Book book);

    void update(Book book);

    void delete(Book book);

}

实体配置代码如下

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity(name="Book")
public class Book {

    private String id;
    private String name;
    private String author;

    @Id
    public String getId() { return id; }
    public void setId(String id) { this.id = id; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public String getAuthor() { return author; }
    public void setAuthor(String author) { this.author = author; }

}
然后其配置代码如下
<!-- 定义SessionFactory -->
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource"/>
        </property>
        <property name="annotatedClasses">
            <list>
                <value>example.chapter6.Book</value>
            </list>
        </property>
        <property name="annotatedPackages">
            <list>
                <value>example.chapter6</value>
            </list>
        </property>
     </bean>

     <!-- 定义TransactionManager -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager" >
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <!-- 定义BookDao -->
    <bean id="bookDao" class="example.chapter6.BookDaoImpl">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <!-- 将所有具有@Transactional注解的Bean自动配置为声明式事务支持 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

评论

1 楼 ynial 2008-09-29  

对接口使用注释 好吗？