Spring 和 Hibernate的集成

文章由LinuxBoy分享于2019-03-30 02:03:48热评（55）

Spring 和 Hibernate的集成

Spring对Hibernate的集成提供了很好的支持,Spring提供了对sessionfactory的初始化,用户不用再关心session的open,close,同时,Spring还提供了灵活的事务声明.

本文通过实例简单讲述如何在Spring中集成Hibernate.

1,将hibernate的配置加入到Spring的配置中(对datasource和sessionfactory进行配置):

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

        <property name="driverClassName" value="Oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORCL" />
        <property name="username" value="user" />
        <property name="password" value="pwd" />
    </bean>
    <bean id="mySessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mappingResources">
            <list>
                <value>com/test/spring/hibernate/Hbtest.hbm.xml
                </value>
            </list>
        </property>
        <property name="hibernateProperties">
            <value>
                hibernate.dialect=org.hibernate.dialect.Oracle10gDialect
                hibernate.show_sql=true
                hibernate.format_sql=true
                hibernate.current_session_context_class=thread
            </value>
        </property>
    </bean>

Hibernate的配置也可以单独放在hibernate.cfg.xml文件中,然后通过如下的配置指向config文件,这样在spring配置中就不要配置dataSource和其他Hibernate相关的信息了.

2,将sessionfactory注入到DAO中,通过sessionfactory操作Hibernate提供的API:

应用实例:

1,通过继承HibernateDaoSupport 或者自己实例化HibernateTemplate来 使用HibernateTemplate, HibernateTemplate 会确保当前Hibernate的 Session 对象的正确打开和关闭，并直接参与到事务管理中去,不要用户去管session的打开和关闭.然后直接调用HibernateTemplate 提供的方法.

public class DAOSupportDAO extends HibernateDaoSupport {

    public void persist2(Hbtest transientInstance) {
        log.debug("persisting Hbtest instance");
        try {
            this.getHibernateTemplate().save(transientInstance);
            log.debug("persist successful");
        } catch (RuntimeException re) {
            log.error("persist failed", re);
            throw re;
        }
    }

...

}

2,通过继承HibernateDaoSupport 使用 SessionFactory.

public class DAOSupportDAO extends HibernateDaoSupport {
    private static final Log log = LogFactory.getLog(DAOSupportDAO.class);

    public void persist(Hbtest transientInstance) {
        log.debug("persisting Hbtest instance");
        try {
            this.getSessionFactory().getCurrentSession().save(transientInstance);
            log.debug("persist successful");
        } catch (RuntimeException re) {
            log.error("persist failed", re);
            throw re;
        }
    }

3,通过注入SessionFactory(推荐做法:好处是不会引入Spring的类)

public class PlainHibernateDAO {
    private static final Log log = LogFactory.getLog(PlainHibernateDAO.class);
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
    public void persist(Hbtest transientInstance) {
        log.debug("persisting Hbtest instance");
        try {
            sessionFactory.getCurrentSession().save(transientInstance);
            log.debug("persist successful");
        } catch (RuntimeException re) {
            log.error("persist failed", re);
            throw re;
        }
    }

对于事务的管理:

1,显示的用Hibernate提供的 SessionFactory.getCurrentSession().beginTransaction(),commit,这时候

hibernateProperties要配置hibernate.current_session_context_class=thread

        <property name="hibernateProperties">
            <value>
                hibernate.current_session_context_class=thread

            </value>

2,利用Spring的事务声明来做管理: hibernateProperties不能配置hibernate.current_session_context_class=thread

    <tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <bean id="txManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="mySessionFactory" />
    </bean>

    <aop:config>
        <aop:pointcut id="persistOperation"
            expression="execution(* com.test.spring.hibernate.PlainHibernateDAO.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="persistOperation" />

    </aop:config>

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