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)

转载于:https://www.cnblogs.com/meet/p/4762381.html