Hibernate实战——不使用配置文件

本是古典何须时尚 2021-07-24 12:35 481阅读 0赞

**一 创建数据库hibernate**

**二 领域模型**

package org.crazyit.app.domain;
    import javax.persistence.*;
    
    @Entity
    @Table(name="news_inf")
    public class News
    {
         // 消息类的标识属性
         @Id
         @GeneratedValue(strategy=GenerationType.IDENTITY)
         private Integer id;
         // 消息标题
         private String title;
         // 消息内容
         private String content;
         // id的setter和getter方法
         public void setId(Integer id)
         {
               this.id = id;
         }
         public Integer getId()
         {
               return this.id;
         }
         // title的setter和getter方法
         public void setTitle(String title)
         {
               this.title = title;
         }
         public String getTitle()
         {
               return this.title;
         }
         // content的setter和getter方法
         public void setContent(String content)
         {
               this.content = content;
         }
         public String getContent()
         {
               return this.content;
         }
    }

**三 测试代码**

package lee;
    
    import org.hibernate.*;
    import org.hibernate.cfg.*;
    import org.hibernate.service.*;
    import org.hibernate.boot.registry.*;
    import org.crazyit.app.domain.*;
    
    
    public class NewsManager
    {
        public static void main(String[] args) throws Exception
        {
            // 实例化Configuration，不加载任何配置文件
            Configuration conf = new Configuration()
                // 通过addAnnotatedClass()方法添加持久化类
                .addAnnotatedClass(org.crazyit.app.domain.News.class)
                // 通过setProperty设置Hibernate的连接属性。
                .setProperty("hibernate.connection.driver_class"
                    , "com.mysql.jdbc.Driver")
                .setProperty("hibernate.connection.url"
                    , "jdbc:mysql://localhost/hibernate")
                .setProperty("hibernate.connection.username" , "root")
                .setProperty("hibernate.connection.password" , "32147")
                .setProperty("hibernate.c3p0.max_size" , "20")
                .setProperty("hibernate.c3p0.min_size" , "1")
                .setProperty("hibernate.c3p0.timeout" , "5000")
                .setProperty("hibernate.c3p0.max_statements" , "100")
                .setProperty("hibernate.c3p0.idle_test_period" , "3000")
                .setProperty("hibernate.c3p0.acquire_increment" , "2")
                .setProperty("hibernate.c3p0.validate" , "true")
                .setProperty("hibernate.dialect"
                    , "org.hibernate.dialect.MySQL5InnoDBDialect")
                .setProperty("hibernate.hbm2ddl.auto" , "update");
            // 以Configuration实例创建SessionFactory实例
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                .applySettings(conf.getProperties()).build();
            SessionFactory sf = conf.buildSessionFactory(serviceRegistry);
            // 实例化Session
            Session sess = sf.openSession();
            // 开始事务
            Transaction tx = sess.beginTransaction();
            // 创建消息实例
            News n = new News();
            // 设置消息标题和消息内容
            n.setTitle("疯狂Java联盟成立了");
            n.setContent("疯狂Java联盟成立了，"
                + "网站地址http://www.crazyit.org");
            // 保存消息
            sess.save(n);
            // 提交事务
            tx.commit();
            // 关闭Session
            sess.close();
        }
    }

**四 运行结果**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

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