spring与hibernate做整合的时候,首先我们要获得sessionFactory。

我们一般只需要操作一个sessionFactory,也就是一个"单例",这一点很适合交给spring来管理。

下面的代码演示如何创建一个JDBC DataSource 和Hibernate SessionFactory:

<beans>
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="org.hsqldb.jdbcDriver"/>
<property name="url" value="jdbc:hsqldb:hsql://localhost:9001"/>
<property name="username" value="sa"/>
<property name="password" value=""/>
</bean>

<bean id="mySessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<property name="mappingResources">
<list>
<value>product.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<value>
hibernate.dialect=org.hibernate.dialect.HSQLDialect
</value>
</property>
</bean>

</beans>


org.springframework.orm.hibernate3.LocalSessionFactoryBean是spring提供的使用XML配置的sessionFactory,是不支持Annotation的。可以使用:


org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean让sessionFactory支持Annotation注解的形式来配置。



改写为(加了Properties的配置,Properties里面提供了hibernate的一些配置,如方言等属性):


<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<property name="mappingResources">
<list>
<value>product.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>


可以看到hibernate的映射方式(mappingResources)是xml的,我们想注入一个使用Annnotation的注解实体类,可以这样改写:


<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<property name="annotatedClasses">
<list>
<value>cn.edu.hpu.model.user</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>



做一下实验要引入hibernate的jar包


User的Annotation注解实体类写法:


User.java:


package cn.edu.hpu.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class User {
private int id;
private String name;

@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

}


UserDaoImpl的save方法就要用SessionFactory进行数据库数据的add了:


package cn.edu.hpu.dao.Impl;

import javax.annotation.Resource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Component;

import cn.edu.hpu.dao.UserDao;
import cn.edu.hpu.model.User;

@Component("u")
public class UserDaoImpl implements UserDao{

private SessionFactory sessionFactory;

@Resource
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}

public SessionFactory getSessionFactory() {
return sessionFactory;
}

public void save(User u) {
Session s=sessionFactory.openSession();
s.beginTransaction();
s.save(u);
s.getTransaction().commit();
System.out.println("add success!!");
}
}

(中间出了一次错,java.lang.IllegalStateException: @Resource annotation requires a single-arg。问题出现在配置resource的时候出现错误!


解决方案!@resource配置在了get上(正确的是应该配置在set上))



测试类:


package cn.edu.hpu.service;
import org.junit.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.edu.hpu.dao.UserDao;
import cn.edu.hpu.model.User;

public class UserServiceTest {

@Test
public void testAdd() throws Exception{
ClassPathXmlApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml");

UserService userService=(UserService)ctx.getBean("userService");
System.out.println(userService.getClass());
User u=new User();
u.setName("jack");
userService.add(u);
ctx.destroy();
}
}


测试成功,数据库储存了一条名为"jack"的字段。



以上是初步的整合,下一次总结是进一步整合。