hibernateDaoSupport和JdbcDaoSupport的使用

1.HibernateDaoSupport的使用：

 

1、HibernateDaoSupport是Spring为Hibernate的DAO提供工具类。此类主要提供了两个方法：
1. public final HibernateTemplate getHibernateTemplate()
2. public final void setSessionFactory(SessionFactory sessionFactory)

其中，setSessionFactory方法接收来自Spring的applicationContext的依赖注入，接收了配置在Spring中的 SessionFactory实例，getHibernateTemplate方法用来利用刚才的SessionFactory生成Session，再生成HibernateTemplate来完成数据库的访问。

 

二. 一个小例子：

 

package test;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import cn.ccb.clpm.common.model.bo.documentservice.ObjectDocRelationshipBO;

public class HibernateDaoSupportTest extends HibernateDaoSupport {

    public void test1() {
        List list = getHibernateTemplate().find("from ObjectDocRelationshipBO o where o.relationId = 1000000068");
        System.out.println(((ObjectDocRelationshipBO)list.get(0)).getCustomerNum());
    }

    public static void main(String[] args) {
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext-daoSupport-test.xml");
        HibernateDaoSupportTest t = (HibernateDaoSupportTest)ac.getBean("test");
        t.test1();
//      t.getHibernateTemplate().save((ObjectDocRelationshipBO)list.get(0));

    }

}

package test; import java.util.List; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; import cn.ccb.clpm.common.model.bo.documentservice.ObjectDocRelationshipBO; public class HibernateDaoSupportTest extends HibernateDaoSupport { public void test1() { List list = getHibernateTemplate().find("from ObjectDocRelationshipBO o where o.relationId = 1000000068"); System.out.println(((ObjectDocRelationshipBO)list.get(0)).getCustomerNum()); } public static void main(String[] args) { ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext-daoSupport-test.xml"); HibernateDaoSupportTest t = (HibernateDaoSupportTest)ac.getBean("test"); t.test1(); // t.getHibernateTemplate().save((ObjectDocRelationshipBO)list.get(0)); } }

 

配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>

        <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="jndiDataSource"/>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.Oracle9Dialect
                </prop>
                <prop key="hibernate.show_sql">
                    true
                </prop>
                <prop key="hibernate.format_sql">
                    true
                </prop>
                <prop key="hibernate.query.factory_class">
                     org.hibernate.hql.classic.ClassicQueryTranslatorFactory
                </prop>
            </props>
        </property>
        <property name="mappingResources">
            <list>
               <value>/cn/ccb/clpm/common/model/bo/documentservice/DocIndexBO.hbm.xml</value>
               <value>/cn/ccb/clpm/common/model/bo/documentservice/ObjectDocRelationshipBO.hbm.xml</value>
               <value>/cn/ccb/clpm/common/model/bo/documentservice/RawMaterialBO.hbm.xml</value>
            </list>
        </property>

        </bean>

        <bean id="test" class="test.HibernateDaoSupportTest">
                <property name="sessionFactory">
                     <ref bean="sessionFactory"/>
                </property>
        </bean>

    <bean id="jndiDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName">
            <value>oracle.jdbc.driver.OracleDriver</value>
        </property>
        <property name="url">
            <value>jdbc:oracle:thin:@128.64.96.28:1521:clpmkfdb</value>
        </property>
        <property name="username">
            <value>clpmtest</value>
        </property>
        <property name="password">
            <value>clpmtest</value>
        </property>
    </bean>

</beans>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="dataSource"> <ref bean="jndiDataSource"/> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.Oracle9Dialect </prop> <prop key="hibernate.show_sql"> true </prop> <prop key="hibernate.format_sql"> true </prop> <prop key="hibernate.query.factory_class"> org.hibernate.hql.classic.ClassicQueryTranslatorFactory </prop> </props> </property> <property name="mappingResources"> <list> <value>/cn/ccb/clpm/common/model/bo/documentservice/DocIndexBO.hbm.xml</value> <value>/cn/ccb/clpm/common/model/bo/documentservice/ObjectDocRelationshipBO.hbm.xml</value> <value>/cn/ccb/clpm/common/model/bo/documentservice/RawMaterialBO.hbm.xml</value> </list> </property> </bean> <bean id="test" class="test.HibernateDaoSupportTest"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property> </bean> <bean id="jndiDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>oracle.jdbc.driver.OracleDriver</value> </property> <property name="url"> <value>jdbc:oracle:thin:@128.64.96.28:1521:clpmkfdb</value> </property> <property name="username"> <value>clpmtest</value> </property> <property name="password"> <value>clpmtest</value> </property> </bean> </beans>

 

这个过程当中，其实DAO的实现依然借助了HibernateTemplate的模板访问方式。只是，HibernateDaoSupport将依赖注入 SessionFactory的工做已经完成，获取HibernateTemplate的工做也已经完成。注意，这种方法须在Spring的配置文件中配置SessionFactory。

在继承HibrnateDaoSupport的DAO实现里，Hibernate Session的管理彻底不须要Hibernate代码打开，而由Spring来管理。Spring会根据实际的操做，采用“每次事务打开一次 session”的策略，自动提升数据库访问的性能。

 

2. JdbcDaoSupport的使用：

 

借助这个类不须要HIbernate框架，也不须要有ORM的对象关联映射。但它和HibernateDaoSupport很相似，有JdbcTemplate来实现增、删、改、查操做。

TestA.java:
public class TestA extends JdbcDaoSupport{
    public void test(){
        int n = this.getJdbcTemplate().queryForInt("select max(userid) from User");
        System.out.println(n);
    }
 public static void main(String[] args) {
  ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
  TestA ta = (TestA)ctx.getBean("testa");
        ta.test();
 }
}

须要在Spring的配置文件applicationContext.xml中控制反转用到链接数据库中的类是注入DataSource，以下：
applicationContext.xml:
        <bean id="testa" class="com.sun.demo.TestA">
        <property name="dataSource">
        <ref bean="myDataSource"/>
        </property>
        </bean>

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其中还有点区别就是: HibernateDaoSupport是使用HQL语言来查询的，而JdbcDaoSupport则是使用SQL来查询，能够

更加简单方便的使用咱们日常的SQL来操做数据库。