Spring声明式事务配置与使用

1、配置：

<context:component-scan base-package="com.vrvwh.wh01" />
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          init-method="init" destroy-method="close">
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <property name="maxActive" value="50" />
        <property name="initialSize" value="1" />
        <property name="maxWait" value="60000" />
        <property name="minIdle" value="1" />
        <property name="timeBetweenEvictionRunsMillis" value="3000" />
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT 'x' FROM DUAL" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <!-- mysql 不支持 poolPreparedStatements -->
        <!--<property name="poolPreparedStatements" value="true" /> -->
        <!--<property name="maxPoolPreparedStatementPerConnectionSize" value="20"
            /> -->
        <!-- 开启Druid的监控统计功能 -->
        <property name="filters" value="stat" />
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <bean id="sessionFactory"
          class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan">
            <list>
                <value>com.vrvwh.wh01.domain</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <value>
                hibernate.dialect=${dialect}
                hibernate.show_sql=${hibernate.show_sql}
                hibernate.hbm2ddl.auto=${hibernate.hbm2ddl.auto}
                cache.provider_class=${hibernate.cache.provider_class}
                cache.use_second_level_cache=${hibernate.cache.use_second_level_cache}
                cache.use_query_cache=${hibernate.cache.use_query_cache}
                hibernate.jdbc.batch_size=${hibernate.jdbc.batch_size}
            </value>
        </property>
    </bean>

    <!-- 配置Hibernate事务管理器 -->
    <bean id="transactionManager"
          class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- 配置事务异常封装 -->
    <bean id="persistenceExceptionTranslationPostProcessor"
          class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
    <tx:annotation-driven transaction-manager="transactionManager"/>

2、使用

public Session getCurrentSession() {
        return sessionFactory.getCurrentSession();
    }

 public Serializable save(T instance) {
        return getCurrentSession().save(instance);
    }

 注意：

sessionFactory.getCurrentSession() 才能在事务中运行

在单独使用不带任何参数的 @Transactional 注释时，传播模式要设置为 REQUIRED，只读标志设置为 false，事务隔离级别设置为 READ_COMMITTED，而且事务不会针对受控异常（checked exception）回滚。

事务使用陷进：http://www.ibm.com/developerworks/cn/java/j-ts1.html