java - Spring Hibernate session 问题

Question

您好，我在 Spring 上设置 hibernate 时遇到问题。我能够使其工作，但它在数据库上创建了大量 session 。据我所知，它为 spring.xml 上的每个 bean 创建 session 。由于我声明了 6 个 bean，因此在应用程序启动时我在数据库上也有 6 个 session ，这是我的代码

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"
        xmlns:tx="http://www.springframework.org/schema/tx"
        >

    <!-- Uncomment and add your base-package here: <context:component-scan base-package="org.springframework.samples.service"/> -->

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:" />
        <property name="username" value="Use" />
        <property name="password" value="Pass" />
    </bean>


    <!-- Hibernate 4 SessionFactory Bean definition -->
    <bean id="hibernate4AnnotatedSessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="com.model" />

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
                <prop key="hibernate.current_session_context_class">thread</prop>
                <!-- <prop key="hibernate.current_session_context_class">managed</prop> -->
                <prop key="hibernate.show_sql">true</prop>
                <prop key="format_sql">true</prop>



            </props>
        </property>
    </bean>





 <bean id="PDao" class="com.PDaoImpl">
        <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" />
    </bean>

    <bean id="PService" class="com.PServiceImpl">
        <property name="pDao" ref="PDao" />
    </bean>

    <bean id="MNDao" class="com.MNDaoImpl">
        <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" />
    </bean>

    <bean id="MNService" class="com.MNServiceImpl">
        <property name="MNDao" ref="MNDao" />
    </bean>

    <bean id="SWDao" class="com.SWDaoImpl">
        <property name="sessionFactory" ref="hibernate4AnnotatedSessionFactory" />
    </bean>

    <bean id="SWService" class="com.SWServiceImpl">
        <property name="SWDao" ref="SWDao" />
    </bean>

Answer 1

您需要使用 transactionManager 来为您管理 session 。

将以下代码行添加到您的 spring.xml

....
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="yourSessionFactory" />
</bean>
....

然后你必须在你的服务实现类上注释 @Transactional("transactionManager") 以使 transactionManager 通过 session 管理事务

@Transactional("transactionManager")
public class PServiceImpl implements PServiceImpl{
  ....

只是一个建议，您可以通过注释替换 DI 的 XML 配置，以使其变得简单在 spring.xml 中，删除所有 beans 声明(xxservice 和 xxxdao)并将其替换为: <context:component-scan base-package="put here the package where your services and daos are lacated" />

您的服务必须如下所示:

@Service
@Transactional("transactionManager")
public class XXXServiceImpl implements XXXService{

    @Autowired
    private XXXDAO xxxDAO;
    ...
}

你的 dao 必须看起来像:

@Repository
public class XXXDAOImpl implements XXXDAO {

    @Autowired
    private SessionFactory sessionFactory;
    ...
}

还有一件事，在文件配置 header 中添加 tx 架构，您的 spring.xml 应该如下所示:

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
     xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">