Spring学习笔记：spring集成hibernate

Spring集成hibernate有两种方式：1 完全使用hibernate编写dao层，把dao注入到spring由spring来管理生命周期,这种方式的好处是dao层与spring没有耦合关系；缺点是需要谨慎处理hibernate的session 关闭, exception, transaction. 2 使用spring的HibernateDaoSupport.这样的话dao层使用spring提供的一系列模板方法，同时不用关心session, exception,事务管理也交给了spring.第一种方式就不说了，基本无需改变dao层。只需要把dao注入就可以了，就学习一下第二种。首先需要注入一个sessionFactory.
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<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
 <property name="configLocation" value="classpath:dao/hibernate/Hibernate.cfg.xml" /> 
</bean> 
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
 <property name="configLocation" value="classpath:dao/hibernate/Hibernate.cfg.xml" />
</bean>
LocalSessionFactoryBean利用配置文件生成sessionFactory的代理实例，这样可以更好的和spring的事务协调工作。sessionFactory还有spring风格的配置， 它需要注入一个dataSource. 见下面的配置文件。
dao继承自HibernateDaoSupport：
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package dao.hibernate;  
 
import java.util.List;  
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;  
import model.Company;  
public class CompanyDaoImpl extends HibernateDaoSupport implements CompanyDao{  
 public List list() {  
  return getHibernateTemplate().find("from Company c");  
 }  
 
 public Company getById(int id) {  
  return (Company) getHibernateTemplate().get(Company.class, id);  
 }  
 
 public List findByName(String name) {  
  return getHibernateTemplate().find("from Company where name like ?", name + "%");  
 }  
 
 public void deleteById(int id) {  
  Company c = (Company) getHibernateTemplate().load(Company.class, id);  
  getHibernateTemplate().delete(c);  
 }  
 
 public void save(Company c) {  
  getHibernateTemplate().save(c);  
 }  
} 
package dao.hibernate;

import java.util.List;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import model.Company;
public class CompanyDaoImpl extends HibernateDaoSupport implements CompanyDao{
 public List list() {
  return getHibernateTemplate().find("from Company c");
 }

 public Company getById(int id) {
  return (Company) getHibernateTemplate().get(Company.class, id);
 }

 public List findByName(String name) {
  return getHibernateTemplate().find("from Company where name like ?", name + "%");
 }

 public void deleteById(int id) {
  Company c = (Company) getHibernateTemplate().load(Company.class, id);
  getHibernateTemplate().delete(c);
 }

 public void save(Company c) {
  getHibernateTemplate().save(c);
 }
}

 

可以看出：所有hibernate的crud操作都封装在HibernateTemplate里面(HibernateDaoSupport持有一个HibernateTemplate)，大大简化了hibernate的操作.
这样的话，dao持有一个hibernateTemplate, hibernateTemplate持有一个sessionFactory, 这样的话配置文件如下：
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<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> 
 <property name="driverClassName" value="${jdbc.driverClassName}" /> 
 <property name="url" value="${jdbc.url}" /> 
 <property name="username" value="${jdbc.username}"/> 
 <property name="password" value="${jdbc.password}"/> 
</bean> 
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 
 <property name="dataSource" ref="dataSource" /> 
 <property name="mappingDirectoryLocations"> 
  <list> 
   <value>classpath:/model</value> 
  </list> 
 </property> 
 <property name="hibernateProperties"> 
  <props> 
   <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop> 
   <prop key="hibernate.show_sql">true</prop> 
   <prop key="hibernate.format_sql">false</prop> 
   <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop> 
   <prop key="hibernate.cache.use_second_level_cache">true</prop> 
   <prop key="hibernate.cache.use_query_cache">true</prop> 
   <prop key="hibernate.connection.autocommit">true</prop> 
   <!--prop key=""></prop--> 
  </props> 
 </property> 
</bean> 
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"> 
 <property name="sessionFactory" ref="sessionFactory"/> 
</bean> 
<bean id="companyDao" class="dao.hibernate.CompanyDaoImpl"> 
 <property name="hibernateTemplate" ref="hibernateTemplate" /> 
</bean> 
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
 <property name="driverClassName" value="${jdbc.driverClassName}" />
 <property name="url" value="${jdbc.url}" />
 <property name="username" value="${jdbc.username}"/>
 <property name="password" value="${jdbc.password}"/>
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
 <property name="dataSource" ref="dataSource" />
 <property name="mappingDirectoryLocations">
  <list>
   <value>classpath:/model</value>
  </list>
 </property>
 <property name="hibernateProperties">
  <props>
   <prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
   <prop key="hibernate.show_sql">true</prop>
   <prop key="hibernate.format_sql">false</prop>
   <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>
   <prop key="hibernate.cache.use_second_level_cache">true</prop>
   <prop key="hibernate.cache.use_query_cache">true</prop>
   <prop key="hibernate.connection.autocommit">true</prop>
   <!--prop key=""></prop-->
  </props>
 </property>
</bean>
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
 <property name="sessionFactory" ref="sessionFactory"/>
</bean>
<bean id="companyDao" class="dao.hibernate.CompanyDaoImpl">
 <property name="hibernateTemplate" ref="hibernateTemplate" />
</bean>
 

测试代码：
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public class Test {  
 public static void main(String[] args) throws InterruptedException, SQLException{  
  ApplicationContext c = new ClassPathXmlApplicationContext("spring-test.xml");  
  CompanyDao dao = (CompanyDao)c.getBean("companyDao");  
  Company com = new Company("www.sss.com","SSS","shanghai", new Date());  
  dao.save(com);//success  
}} 
public class Test {
 public static void main(String[] args) throws InterruptedException, SQLException{
  ApplicationContext c = new ClassPathXmlApplicationContext("spring-test.xml");
  CompanyDao dao = (CompanyDao)c.getBean("companyDao");
  Company com = new Company("www.sss.com","SSS","shanghai", new Date());
  dao.save(com);//success
}}

 

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/sunxing007/archive/2009/09/21/4575334.aspx