将Hibernate和iBatis两Orm框架整合，取长补短

由于Hibernate比较适合对数据进行增，删，改的操作，而iBatis适合进行数据查询，批量操作，而且方便利用DB底层的功能，因此我尝试着持久层同时使用Hibernate和iBatis。

以下是我BaseDaoImpl的代码：

Java代码

package mypack.dao;

import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.ibatis.SqlMapClientTemplate;

import com.ibatis.sqlmap.client.SqlMapClient;

public abstract class BaseDaoImpl implements BaseDAO
{
    //iBatis的Template
    private SqlMapClientTemplate sqlMapClientTemplate ;
    //Hibernate的Template
    private HibernateTemplate hibernateTemplate ;

    //设置Hibernate
    public final void setSessionFactory(SessionFactory sessionFactory); {
        if(this.hibernateTemplate == null);{
            this.hibernateTemplate = new HibernateTemplate(sessionFactory);;
        }else{
            this.hibernateTemplate.setSessionFactory(sessionFactory);;
        }
    }
    //设置ibatis
    public final void setSqlMapClient(SqlMapClient sqlMapClient); {
        if(this.sqlMapClientTemplate == null);{
            this.sqlMapClientTemplate = new SqlMapClientTemplate();;
        }
        this.sqlMapClientTemplate.setSqlMapClient(sqlMapClient);;
    }

    //获取Hibernate的模板
    protected HibernateTemplate getHibernateTemplate();{
       return hibernateTemplate
    }
    //获取iBatis的模板
    protected SqlMapClientTemplate getSqlMapClientTemplate(); {
        return sqlMapClientTemplate;
    }

    //一些Hibernate 的通用方法,
    //当然也可不必声明，子类通过hibernateTemplate来操作

    protected void save(Object object); {
        hibernateTemplate.save(object);;
    }
    protected void saveOrUpdate(Object object); {
        hibernateTemplate.saveOrUpdate(object);;
    }

    protected void update(Object object); {
        hibernateTemplate.update(object);;
    }
    protected void delete(Object object);{
        hibernateTemplate.delete(object);;
    }
    protected Object getObject(Class clazz, Serializable id);{
        return hibernateTemplate.get(clazz, id);;
    }

    //子类通过iBatis 的sqlMapClientTemplate来操作
}

package mypack.dao;import org.hibernate.SessionFactory;

import org.springframework.orm.hibernate3.HibernateCallback;

import org.springframework.orm.hibernate3.HibernateTemplate;

import org.springframework.orm.ibatis.SqlMapClientTemplate;

import com.ibatis.sqlmap.client.SqlMapClient;

public abstract class BaseDaoImpl implements BaseDAO{

//iBatis的Template

private SqlMapClientTemplate sqlMapClientTemplate ;

//Hibernate的Template

private HibernateTemplate hibernateTemplate ;

//设置Hibernate

public final void setSessionFactory(SessionFactory sessionFactory); {

if(this.hibernateTemplate == null);{

this.hibernateTemplate = new HibernateTemplate(sessionFactory);

}else{ this.hibernateTemplate.setSessionFactory(sessionFactory);; }

} //设置ibatis public final void setSqlMapClient(SqlMapClient sqlMapClient); {

if(this.sqlMapClientTemplate == null){

this.sqlMapClientTemplate = new SqlMapClientTemplate();

}

this.sqlMapClientTemplate.setSqlMapClient(sqlMapClient);

} //获取Hibernate的模板

protected HibernateTemplate getHibernateTemplate(){

return hibernateTemplate

}

//获取iBatis的模板

protected SqlMapClientTemplate getSqlMapClientTemplate()

{ return sqlMapClientTemplate; }

//一些Hibernate 的通用方法, //当然也可不必声明，子类通过hibernateTemplate来操作

protected void save(Object object){

hibernateTemplate.save(object);}

protected void saveOrUpdate(Object object){

hibernateTemplate.saveOrUpdate(object);

} protected void update(Object object){

hibernateTemplate.update(object);}

protected void delete(Object object)

{ hibernateTemplate.delete(object);}

protected Object getObject(Class clazz, Serializable id){

return hibernateTemplate.get(clazz, id); }

//子类通过iBatis 的sqlMapClientTemplate来操作

}

即以组合方式，将HibernateTemplate和sqlMapClientTemplate集成起来，完成类似SqlMapClientDaoSupport和HibernateDaoSupport的工作，由于Java无法多类继承，所以只得以组合方式来做。不过Spring的两个Support代码不多，自己做满好，满好－－记得这是梁家辉在《棋王》上最爱说说的:)

在Spring中的主要配置是这样的：

首先配置Hibernate的SessionFactory：

Java代码

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    
    <property name="dataSource">
        <ref local="dataSource"/>
    </property>

    
    <property name="mappingDirectoryLocations">
        <list>
            <value>classpath:/mypack</value>
        </list>
    </property>

    
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.cglib.use_reflection_optimizer">${hibernate.cglib.use_reflection_optimizer}</prop>
        </props>
    </property>
    <property name="useTransactionAwareDataSource" value="true"></property>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">  <property name="dataSource"> <ref local="dataSource"/> </property>  <property name="mappingDirectoryLocations"> <list> <value>classpath:/mypack</value> </list> </property>  <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">${hibernate.dialect}</prop> <prop key="hibernate.show_sql">${hibernate.show_sql}</prop> <prop key="hibernate.cglib.use_reflection_optimizer">${hibernate.cglib.use_reflection_optimizer}</prop> </props> </property> <property name="useTransactionAwareDataSource" value="true"></property> </bean>

再是iBatis的sqlMapClient

Java代码

两者是useTransactionAwareDataSource属性都设置为ture，看Spring的Javadoc，说这可以在多Orm框架中保持事务的一致性，即通过DataSource关联，果真如此否？我还没有确定出来。

事务管理器，用Hibernate的

Java代码

<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory">
        <ref local="sessionFactory"/>
    </property>
</bean >

<bean id="txProxyTemplate" abstract="true"
        class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
    
    <property name="transactionManager" >
        <ref local="transactionManager"/>
    </property>

    
    <property name="transactionAttributes">
      <props>
         <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
         <prop key="add*">PROPAGATION_REQUIRED</prop>
         <prop key="update*">PROPAGATION_REQUIRED</prop>
         <prop key="delete*">PROPAGATION_REQUIRED</prop>
      </props>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory"> <ref local="sessionFactory"/> </property> </bean > <bean id="txProxyTemplate" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">  <property name="transactionManager" > <ref local="transactionManager"/> </property>  <property name="transactionAttributes"> <props> <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop> <prop key="add*">PROPAGATION_REQUIRED</prop> <prop key="update*">PROPAGATION_REQUIRED</prop> <prop key="delete*">PROPAGATION_REQUIRED</prop> </props> </property> </bean>

然后做两个Dao，一个是CustomerDao，这个走Hibernate，直接看其实现：

Java代码

   package mypack.dao;

import mypack.Customer;

public class CustomerDaoImpl extends BaseDaoImpl implements CustomerDao {

    public void update(Customer customer); {
        super.save(customer);;
    }
}

package mypack.dao;import mypack.Customer;public class CustomerDaoImpl extends BaseDaoImpl implements CustomerDao { public void update(Customer customer); { super.save(customer);; }}

再看OrderDao的实现，这个走iBatis（先分道扬镳，再殊途同归）：

Java代码

     package mypack.dao;

import java.sql.SQLException;

import org.springframework.orm.ibatis.SqlMapClientCallback;

public class OrderDaoImpl extends BaseDaoImpl implements OrderDao {
  /**
   * update ibatis
   */
  public void updateOrderPrice(float rate);
  {
     getSqlMapClientTemplate();.update("updateOrderPrice",null);;
  }
}

package mypack.dao;import java.sql.SQLException;import org.springframework.orm.ibatis.SqlMapClientCallback;public class OrderDaoImpl extends BaseDaoImpl implements OrderDao { /** * update ibatis */ public void updateOrderPrice(float rate); { getSqlMapClientTemplate();.update("updateOrderPrice",null);; }}

再在一个Service中同时用这两上Dao完成一个事务：

Java代码

    package mypack.service;

import mypack.Customer;
import mypack.dao.CustomerDao;
import mypack.dao.OrderDao;

public class CustomerServiceImpl implements CustomerService {

    private CustomerDao customerDao;
    private OrderDao orderDao;
    public void updateCustomerAndOrder(Customer customer, float rate); {
        customerDao.update(customer);;
        orderDao.updateOrderPrice(rate);;
    }
    public CustomerDao getCustomerDao(); {
        return customerDao;
    }
    public void setCustomerDao(CustomerDao customerDao); {
        this.customerDao = customerDao;
    }
    public OrderDao getOrderDao(); {
        return orderDao;
    }
    public void setOrderDao(OrderDao orderDao); {
        this.orderDao = orderDao;
    }
}

package mypack.service;import mypack.Customer;

import mypack.dao.CustomerDao;

import mypack.dao.OrderDao;

public class CustomerServiceImpl implements CustomerService {

private CustomerDao customerDao;

private OrderDao orderDao;

public void updateCustomerAndOrder(Customer customer, float rate)

{ customerDao.update(customer);

orderDao.updateOrderPrice(rate);

} public CustomerDao getCustomerDao(); { return customerDao; } public void setCustomerDao(CustomerDao customerDao); { this.customerDao = customerDao; } public OrderDao getOrderDao(); { return orderDao; } public void setOrderDao(OrderDao orderDao); { this.orderDao = orderDao; }}

插入一条Customer记录，再Update所有Order（纯粹研究，没有实际意义）

走：

Java代码

package test.service;

import org.apache.log4j.PropertyConfigurator;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SysInit
{
    public static ApplicationContext factory = null;
    private static String[] filepath = {"applicationContext_service.xml"};
    public static void init();
    {
        PropertyConfigurator.configure("D:\\personalWork\\proGroup\\hiTestPro\\src\\log4j.properties");;
        if (factory == null);
        {
            try
            {
               factory = new  ClassPathXmlApplicationContext(filepath);;


            } catch (Exception e);
            {
                e.printStackTrace();;
            }
        }

        try
        {
        } catch (Exception e);
        {
            e.printStackTrace();;
        }
    }

    public static Object getBean(String name);
    {
        if (factory == null);
        {
            init();;
        }
        return factory.getBean(name);;
    }

    public static void main(String[] args);
    {
        SysInit.init();;
    }
}



    package test.service;

import junit.framework.TestCase;
import mypack.Customer;
import mypack.service.CustomerService;

public class CustomerServiceTest extends TestCase {

    protected void setUp(); throws Exception {
        super.setUp();;
        SysInit.init();;
    }

    protected void tearDown(); throws Exception {
        super.tearDown();;
    }

    public void testupdateCustomerAndOrder();
    {
        CustomerService customerService = (CustomerService);SysInit.getBean("customerService");;
        Customer customer = new Customer();;
        customer.setId(3L);;
        customer.setFirstname("xiong");;
        customer.setLastname("hua");;
        customer.setSex('F');;
        customerService.updateCustomerAndOrder(customer, 2);;
    }
}

package test.service;import org.apache.log4j.PropertyConfigurator;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class SysInit{ public static ApplicationContext factory = null; private static String[] filepath = {"applicationContext_service.xml"}; public static void init(); { PropertyConfigurator.configure("D:\\personalWork\\proGroup\\hiTestPro\\src\\log4j.properties");; if (factory == null); { try { factory = new ClassPathXmlApplicationContext(filepath);; } catch (Exception e); { e.printStackTrace();; } } try { } catch (Exception e); { e.printStackTrace();; } } public static Object getBean(String name); { if (factory == null); { init();; } return factory.getBean(name);; } public static void main(String[] args); { SysInit.init();; }} package test.service;import junit.framework.TestCase;import mypack.Customer;import mypack.service.CustomerService;public class CustomerServiceTest extends TestCase { protected void setUp(); throws Exception { super.setUp();; SysInit.init();; } protected void tearDown(); throws Exception { super.tearDown();; } public void testupdateCustomerAndOrder(); { CustomerService customerService = (CustomerService);SysInit.getBean("customerService");; Customer customer = new Customer();; customer.setId(3L);; customer.setFirstname("xiong");; customer.setLastname("hua");; customer.setSex('F');; customerService.updateCustomerAndOrder(customer, 2);; }}

我测试了一下，如果iBatis的操作有问题，Customer也是没有办法插入了，所以基本上判断，这两个框架是可以做事务的。

Hibernate的缓存确实是一个问题，不过可以通过合理分配两者的工作来解决，比如Hibernate负责增删改，而ibatis只负责查询。
目前我的应用就是简要列表查询的数据由iBatis负责获取，从简要列表进入后的操作由Hibernate负责。
不过，如果这样限定后，也就没有必须管事务的事了。整合的目的只是为了提高Dao的内聚性并屏蔽掉具体实现。

iBatis主要是可以将Sql和代码解耦，使Java代码更纯一些，而Hibernate有在查询数据时有一个不好的地方是，结果集中的记录要对应Domain Class，这就限制了结果集字段的灵活性，数据库中的结果集构造是很灵活的，而不是仅对应Domain Classs。另外Hibernate还要为每条结果集构造对象，数据缓存等工作，如果仅是查询，这种工作是没有必要而费时的。
总之，我觉得Hibernate不太适合于构造简要列表时的查询，它的强项在于对一个Domain Class的增，删，改，查，而非业务数据查询。

将Hibernate和iBatis两Orm框架整合，取长补短

将Hibernate和iBatis两Orm框架整合，取长补短

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