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spring+hibernate如何连数据库

热度:9450   发布时间:2013-02-25 21:17:33.0
spring+hibernate怎么连数据库?
从数据库逆向hibernate生成了hbm.xml和javabean

它自动生成的userDAO,其中的一个方法:
public List findByProperty(String propertyName, Object value) {
log.debug("finding User instance with property: " + propertyName
+ ", value: " + value);
try {
String queryString = "from User as model where model."
+ propertyName + "= ?";
return getHibernateTemplate().find(queryString, value);
} catch (RuntimeException re) {
log.error("find by property name failed", re);
throw re;
}
}

applicationContext配置:
<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">
<constructor-arg>
<ref local="sessionFactory"></ref>
</constructor-arg>
</bean>

<bean id="userDAO" class="com.LostAndFound.dao.userDAO">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>

<bean id="userService" class="com.LostAndFound.service.UserService">
<property name="userDao">
<ref local="userDAO"></ref>
</property>
</bean>

<bean name="/login" class="com.LostAndFound.myaction.LoginAction">
<property name="userService">
<ref bean="userService"></ref>
</property>
</bean>

运行后:
java.lang.NullPointerException
com.LostAndFound.dao.userDAO.findByProperty(userDAO.java:92)

是不是说findByProperty里 getHibernateTemplate()是空值?是配置错了吗?没取到数据库的数据?

------解决方案--------------------------------------------------------
这里配置可能有问题

<bean id="userDAO" class="com.LostAndFound.dao.userDAO">
 <property name="sessionFactory" ref="sessionFactory"></property>
 </bean>
 
dao里面应该配的是hibernateTemplate吧
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