News.java
package mc.bean;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@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;
省略setter和getter方法
Main方法
package mc.bean;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class MainTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
// 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(mc.bean.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:3306/mctest")
.setProperty("hibernate.connection.username" , "root")
.setProperty("hibernate.connection.password" , "123457")
.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.MySQLDialect")
.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("00000");
n.setContent("0000000");
// 保存消息
sess.save(n);
// 提交事务
tx.commit();
System.out.println("操作成功！");
// 关闭Session
sess.close();
}
}
异常
十一月 12, 2016 3:11:45 下午 org.hibernate.annotations.common.reflection.java.JavaReflectionManager
INFO: HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
十一月 12, 2016 3:11:45 下午 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.3.5.Final}
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.hibernate.cfg.Configuration.reset(Configuration.java:324)
at org.hibernate.cfg.Configuration.(Configuration.java:289)
at org.hibernate.cfg.Configuration.(Configuration.java:293)
at mc.bean.MainTest.main(MainTest.java:15)
Caused by: java.lang.NullPointerException
at org.hibernate.internal.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:170)
at org.hibernate.cfg.Environment.(Environment.java:221)
... 4 more