1、在applicationContext.xml文件中初始化SessionFactory(annotation方式)
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<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations" value="classpath:jdbc.properties" />
</bean>
<bean id="dataSource" destroy-method="close"
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>
<!-- annotation方式管理hibernate的sessionFactory --><bean id="mySessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="annotatedClasses">
<list>
<value>com.fz.annotation.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>
<prop key="hibernate.format_sql">true</prop>
</props>
</property>
</bean>
一个数据库连接,只需要一个SessionFactory即可。通过sessionFactory来获取session,所以让Spring来管理hibernate的SessionFactory比较合适
因为,Spring管理的bean默认就是单例模式。
在使用了annotation方式之后就不需要配置User.hbm.xml文件了,例如,在<property>标签的list中定义的是对象,而不是User.hbm.xml
1.1 使用PackagesToScan来扫描包
查看annotatedClasses这个属性,每一个实体类都要写在这里,比较麻烦。
<property name="annotatedClasses">
<list>
<value>com.fz.annotation.model.User</value>
</list>
</property>
所以,可以使用AnnotationSessionFactoryBean的一个packagesToScan属性即可
修改后的配置如下:以后的实体都放到相应的包里面即可
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<property name="packagesToScan">
<list>
<value>com.fz.annotation.model</value>
</list>
</property>
2、导入hibernate3的jar包
3、编写User实体类
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package com.fz.annotation.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entitypublic class User {
private int id;
private String username;
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}该实体类属性需要和数据库中字段名对应,不能多
4、使用sessionFactory
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package com.fz.annotation.dao.impl;
import javax.annotation.Resource;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Repository;
import com.fz.annotation.dao.UserDao;
import com.fz.annotation.model.User;
@Repository("userDao")
public class UserDaoImpl implements UserDao{
private SessionFactory sessionFactory;
public void userAdd(User user) {
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(user);
session.getTransaction().commit();
session.close();
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
@Resource
public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}
}