hibernateDaoSupport和JdbcDaoSupport的使用

1.HibernateDaoSupport的使用：

 

1、HibernateDaoSupport是Spring爲Hibernate的DAO提供工具類。此類主要提供了兩個方法：
1. public final HibernateTemplate getHibernateTemplate()
2. public final void setSessionFactory(SessionFactory sessionFactory)

其中，setSessionFactory方法接收來自Spring的applicationContext的依賴注入，接收了配置在Spring中的 SessionFactory實例，getHibernateTemplate方法用來利用剛纔的SessionFactory生成Session，再生成HibernateTemplate來完成數據庫的訪問。

 

二. 一個小例子：

 

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>

 

這個過程當中，其實DAO的實現依然藉助了HibernateTemplate的模板訪問方式。只是，HibernateDaoSupport將依賴注入 SessionFactory的工做已經完成，獲取HibernateTemplate的工做也已經完成。注意，這種方法須在Spring的配置文件中配置SessionFactory。

在繼承HibrnateDaoSupport的DAO實現裏，Hibernate Session的管理徹底不須要Hibernate代碼打開，而由Spring來管理。Spring會根據實際的操做，採用「每次事務打開一次 session」的策略，自動提升數據庫訪問的性能。

 

2. JdbcDaoSupport的使用：

 

藉助這個類不須要HIbernate框架，也不須要有ORM的對象關聯映射。但它和HibernateDaoSupport很相似，有JdbcTemplate來實現增、刪、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();
 }
}

須要在Spring的配置文件applicationContext.xml中控制反轉用到鏈接數據庫中的類是注入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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其中還有點區別就是: HibernateDaoSupport是使用HQL語言來查詢的，而JdbcDaoSupport則是使用SQL來查詢，能夠

更加簡單方便的使用咱們日常的SQL來操做數據庫。