Hibernate

Domain Obj限制
1.必须有默认构造方法
2.有无意义的标示符id（primary key）可选
3.非final得，对懒加载有影响 可选

Domain Java Object(User)
public class user{
  private int id;
  private String name;
  private Date birthDay

// getter&setter
}

关于commit
在DAO里面，记得是这样

	public Transaction tx=null;

	public void save(PrimaryInfo transientInstance) {
		log.debug("saving PrimaryInfo instance");
		try {
			tx=getSession().beginTransaction();
			getSession().save(transientInstance);
			System.out.println("保存成功");
			tx.commit();
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

一定要commit！！！一定！