Spring整合Hibernate：1、annotation方式管理SessionFactory

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;   @Entity public 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;     } }

来自为知笔记(Wiz)