Hibernate遇上Spring注释方法擦出的火花

xiaoxiao2021-02-28  100

在这篇博客中我直接使用sessionFactory来获得currentSession来操纵数据库,在我上一篇博客中出现的问题,HibernateTemplate在Hibernate4.0中被抛弃了,所以这个方法刚好解决了这个问题。 一、项目的结构图 二、具体实现 1、User类

@Entity @Table(name="t_user") public class User { @Id @GeneratedValue(strategy=GenerationType.AUTO) private Integer id; @Column(name="username",length=50) private String username; @Column(name="password",length=50) private String password; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }

2、UserDao接口

public interface UserDao { public void save(User user); public void update(User user); public void delete(User user); public User findById(Integer id); public List<User> findAll(); }

3、UserDaoImpl 类 采用事务功能提高代码的安全性,通过spring注释的方式自动加载sessionFactory通过setter方法

@Repository public class UserDaoImpl implements UserDao{ private SessionFactory sessionFactory; @Autowired public void setSessionFactory(SessionFactory sessionFactory){ this.sessionFactory=sessionFactory; } public SessionFactory getSessionFactory(){ return this.sessionFactory; } public Session getCurrentSession(){ return this.sessionFactory.getCurrentSession(); } public void save(User user) { Transaction tx=this.getCurrentSession().beginTransaction(); try{ this.getCurrentSession().save(user); tx.commit(); }catch(Exception e){ if(null!=tx){tx.rollback();} e.printStackTrace(); } } public void update(User user) { Transaction tx=this.getCurrentSession().beginTransaction(); try{ this.getCurrentSession().update(user); tx.commit(); }catch(Exception e){ if(null!=tx){tx.rollback();} e.printStackTrace(); } } public void delete(User user) { Transaction tx=this.getCurrentSession().beginTransaction(); try{ this.getCurrentSession().delete(user); tx.commit(); }catch(Exception e){ if(null!=tx){tx.rollback();} e.printStackTrace(); } } public User findById(Integer id) { Transaction tx=this.getCurrentSession().beginTransaction(); User user=(User)this.getCurrentSession().get(User.class, id); tx.commit(); return user; } public List<User> findAll() { Transaction tx=this.getCurrentSession().beginTransaction(); List<User> users=(List<User>) this.getCurrentSession().get(User.class,null); tx.commit(); return users; } }

4、applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd"> <!-- 扫描 --> <context:component-scan base-package="cn.wjw"></context:component-scan> <!-- 0.1加载properties --> <context:property-placeholder location="classpath:c3p0-db.properties"/> <!-- 0.2配置数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!-- 1.配置 SessionFactory --> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <!-- 1.1配置数据源 --> <property name="dataSource" ref="dataSource"/> <!-- 1.2 其他配置项,要使用Hibernate全属性名,如果Hibernate.不要省略 --> <property name="hibernateProperties"> <props> <!-- 数据库方言定义 --> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQL5Dialect </prop> <!-- 向控制台显示执行的SQL语句 --> <prop key="hibernate.show_sql">true</prop> <!-- 创建SessionFactory对象时自动创建数据库表 --> <prop key="hibernate.hbm2ddl.auto">update</prop> <!-- 取消bean校验 --> <prop key="javax.persistence.validation.mode">none</prop> <prop key="hibernate.current_session_context_class">thread</prop> <prop key=""></prop> </props> </property> <property name="packagesToScan"> <list> <value>cn.wjw.domain</value> </list> </property> </bean> <!-- 4.事务管理 --> <!-- #1 事务管理器,就是平台,Spring工具产生,依赖于使用 持久方案 (hibernate、jdbc等) --> <bean id="txManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"/> </bean> <!-- 将事务管理注册Spring * proxy-target-class="true" :使用cglib * proxy-target-class="false":有接口将使用JDK--> <tx:annotation-driven transaction-manager="txManager"/> </beans>

5、c3p0-db.properties

jdbc.driverClass=com.mysql.jdbc.Driver jdbc.jdbcUrl=jdbc\:mysql\://localhost\:3306/database?useUnicode\=true&;characterEncoding\=utf-8 jdbc.user=你的数据库用户名 jdbc.password=你的数据库密码

6、Spring注释的优点 使得代码简洁,但却可读性降低,但是在平时的开发中熟练这种方法有助于提高开发效率。

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