my first hibernate annotation

最新推荐文章于 2022-03-22 22:16:04 发布

iteye_194

最新推荐文章于 2022-03-22 22:16:04 发布

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分类专栏： hibernate 文章标签： Hibernate MySQL Bean XML JDBC

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annotation 感觉并没有质变只不过把原来xml里面的东西改道bean中了
先弄一个hibernateutil类用来产生session

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
	private static final SessionFactory sessionFactory;
	static {
                //气死我了 官方的文档没有下面第一句令我调了n长时间都没有调同
		Configuration config = new AnnotationConfiguration().configure();
		sessionFactory = config.buildSessionFactory();
	}
	public static Session getSession(){
		return sessionFactory.openSession();
	}
}

需要持久化地bean

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;


@Entity
@Table(name="user_s") // 非必要，在表格名称与类别名称不同时使用
public class User {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private Integer id;

	private String name;

	private String email;

	private String descn;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}

	public String getDescn() {
		return descn;
	}

	public void setDescn(String descn) {
		this.descn = descn;
	}
}

当然需要一个dao了，非常简单我只有create方法

import org.hibernate.Session;
import org.hibernate.Transaction;

import test.com.bean.User;
import test.com.fa.HibernateUtil;

public class UserDao {
	public void create(User user){
		Session session = HibernateUtil.getSession();
		Transaction tr = session.beginTransaction();
		session.save(user);
		tr.commit();
		session.close();

	}
}

当然还有一个测试类为什么要有中文当然要解决中文乱码问题了

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		User user = new User();
		user.setName("才四十");
		user.setEmail("123@163.com");
		user.setDescn("123456");
		UserDao ud = new UserDao();
		ud.create(user);

	}

}

呵呵快完工了还差一个hibernate.cfg.xml
注意后面的:useUnicode=true&characterEncoding=UTF-8, 在xml中&要改为“&”+“amp;” “”+是不要的

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
		"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
		"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">



        true

        org.hibernate.dialect.MySQLDialect

        com.mysql.jdbc.Driver

        jdbc:mysql://localhost:3306/socity?useUnicode=true&characterEncoding=UTF-8

        root




		true

还有sql

CREATE TABLE `user_s` (
  `id` int(11) NOT NULL auto_increment,
  `name` varchar(50) default NULL,
  `email` varchar(50) default NULL,
  `descn` varchar(200) default NULL,
  PRIMARY KEY  (`id`)
)