Spring 数据库

Spring 数据库

定义DataSource
<bean id="dataSource " class="org.apache.commons.dbcp.BasicDataSource ">
    <property name="driver "><value></value> </property>
    <property name="url "> <value></value> </property>
    <property name="username "> <value></value> </property>
    <property name="password "><value></value></property>
</bean>
测试;
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
Spring的所有的模板类都是线程安全的.Spring的数据访问框架都结合了模板类.
使用JdbcTemplate模板:
    使用JdbcTemplate 模板,每一个DAO类都需要配置一个JdbcTemplate的实例.
    例如:
        <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
            <property name="dataSource"><ref bean="dataSource"/></property>
        </bean>
        <bean id="**Dao1" class="**.**.*DAO1">
            <property name="jdbcTemplate"><ref bean="jdbcTemplate"/></property>
        </bean>
        <bean id="**Dao2" class="**.**.*DAO2">
            <property name="jdbcTemplate"><ref bean="jdbcTemplate"/></property>
        </bean>

Spring 整合 Hibernate

(1)定义DataSource

<bean id="dataSource " class="org.apache.commons.dbcp.BasicDataSource ">
    <property name="driver "><value></value> </property>
    <property name="url "> <value></value> </property>
    <property name="username "> <value></value> </property>
    <property name="password "><value></value></property>
</bean>

(2) 定义SessionFactory
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean ">
    <property name="dataSource">
        <ref local="dataSource_id"/>
    </property>
    <property name="hibernateProperties ">
        <props>
            <prop key="hibernate.dialect"></prop>
            <prop key="hibernate.cache.provider_class"></prop>
            <prop key="hibernate.query.factory_class"></prop>
            <prop key="hibernate.connection.autocommit"></prop>
            <prop key="hibernate.jdbc.batch_size"></prop>
            <prop key="hibernate.jdbc.fetch_size"></prop>
            <prop key="hibernate.cache.use_query_cache"></prop>
            <prop key="hibernate.cache.use_second_level_cache"></prop>
            <prop key="hibernate.show_sql"></prop>
        </props>
    </property>
    <property name="mappingResources ">
        <list>
            <value>com/**/**/**/**.hbm.xml</value>
        </list>
    </property>
</bean>
当持久化类太多,mappingResources配置造成太多的value值;此时是用class path下的一个子路径来配置
mappingDirectoryLocations属性,Spring会找到这个路径下的每一个*.hbm.xml文件,来配置SessionFactory.

<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
    <property name="mappingDirectoryLocations">
        <list>
            <value>classpath: /com/**/*/*</value>
        </list>
    </property>
</bean>
(3)接下来,需要一个模板类 .
<bean id="hibernateTemplate " class="org.springframework.orm.hibernate.HIbernateTemplate">
    <property name="sessionFactory">
        <ref bean="sessionFactory"/>
    </property>
</bean>

<bean id="*DAO" class="**.**.*DAO">
    <property name="hibernateTemplate">
        <ref bean="hibernateTemplate"/>
    </property>
</bean>

使用Hibernate中的模板回调机制
    HibernateTemplate和HibernateCallback
    HibernateCallback接口只有一个方法
    Object doInHibernate(Session session) throws HibernateException ,SQLException;
    hibernateTemplate.update
                                    .find
                                    .load
    等方法;
HibernateDaoSupport的子类
    选择这种设计,就需要织入SessionFactory;

 

Hibernate事务
  (4) 事务管理

<bean id="transactionManager " class="org.springframework.orm.hibernate.HibernateTransactionManager ">
        <property name="sessionFactory">
            <ref bean="sessionFactory"/>
        </property>
    </bean>
    HibernateTransactionManager把事务管理委托给一个从Hibernate Session中取得的net.sf.hibernate.Transaction对象;
    事务成功时,HibernateTransactionManager将调用Transaction对象的commit()方法.失败,调用rollback()方法;

(5)

<bean id="**Service" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean ">
    <property name="proxyInterfaces">
        <list>
            <value>***.I**Service </value>
        </list>
    </property>
   
    <property name="target">
        <ref bean="**ServiceTarget"/>
    </property>
   
    <property name="transactionManager">
        <ref bean="transactionManager"/>
    </property>
   
    <property name="transactionAttributeSource">
        <ref bean="**attributeSource"/>
    </property>
</bean>