jimuserdao.java

一个使用Java实现的类似与QQ的聊天程序。使用了Hibernate组建。可用于学习Java网络编程和Hiberante数据库组件的学习

package com.jim.database;

import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Criteria;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Example;

/**
 * Data access object (DAO) for domain model class JIMUser.
 * @see com.jim.database.JIMUser
 * @author MyEclipse - Hibernate Tools
 */
public class JIMUserDAO extends BaseHibernateDAO {

    private static final Log log = LogFactory.getLog(JIMUserDAO.class);

	//property constants
	public static final String PWD = "pwd";
	public static final String NICKNM = "nicknm";
	public static final String STATUS = "status";
	public static final String IP = "ip";
	public static final String GENDER = "gender";
	public static final String EMAIL = "email";
	public static final String INFOR = "infor";
	public static final String PICINDEX = "picindex";

    
    public void save(JIMUser transientInstance) {
        log.debug("saving JIMUser instance via JIMUserDAO");
        try {
            getSession().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	public void delete(JIMUser persistentInstance) {
        log.debug("deleting JIMUser instance");
        try {
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
    
    public JIMUser findById( java.lang.Integer id) {
        log.debug("getting JIMUser instance with id: " + id);
        try {
            JIMUser instance = (JIMUser) getSession()
                    .get(JIMUser.class , id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    
    @SuppressWarnings("unchecked")
    public List<JIMUser> findByExample(JIMUser instance) {
    	log.debug("finding JIMUser instance by example");
    	try {
    		List results = getSession()
    		.createCriteria(JIMUser.class)
    		.add(Example.create(instance))
    		.list();
    		log.debug("find by example successful, result size: " + results.size());
    		return (List<JIMUser>)results;
    	} catch (RuntimeException re) {
    		log.error("find by example failed", re);
    		throw re;
    	}
    }    
    
    @SuppressWarnings("unchecked")
    public List<JIMUser> findByCriteria(Criterion... criterion) {
    	log.debug("finding JIMUser instance by Criteria");
    	try {
    		Criteria crit = getSession().createCriteria(JIMUser.class);
    		for (Criterion c : criterion) {
                crit.add(c);
            }
    		List results = crit.list();
    		return (List<JIMUser>)results;
    	} catch (RuntimeException re) {
    		log.error("find by Criteria failed", re);
    		throw re;
    	}
    }    
    
    @SuppressWarnings("unchecked")
	public List<JIMUser> findByProperty(String propertyName, Object value) {
      log.debug("finding JIMUser instance with property: " + propertyName
            + ", value: " + value);
      try {
         String queryString = "from JIMUser as model where model." 
         						+ propertyName + "= ?";
         Query queryObject = getSession().createQuery(queryString);
		 queryObject.setParameter(0, value);
		 return (List<JIMUser>)queryObject.list();
      } catch (RuntimeException re) {
         log.error("find by property name failed", re);
         throw re;
      }
	}

	public List<JIMUser> findByPwd(Object pwd) {
		return findByProperty(PWD, pwd);
	}
	
	public List<JIMUser> findByNicknm(Object nicknm) {
		return findByProperty(NICKNM, nicknm);
	}
	
	public List<JIMUser> findByStatus(boolean status) {
		return findByProperty(STATUS, new Boolean(status));
	}
	
	public List<JIMUser> findByIp(Object ip) {
		return findByProperty(IP, ip);
	}
	
	public List<JIMUser> findByGender(Object gender) {
		return findByProperty(GENDER, gender);
	}
	
	public List<JIMUser> findByEmail(Object email) {
		return findByProperty(EMAIL, email);
	}
	
	public List<JIMUser> findByInfor(Object infor) {
		return findByProperty(INFOR, infor);
	}
	
	public List<JIMUser> findByPicindex(Object picindex) {
		return findByProperty(PICINDEX, picindex);
	}
	
    public JIMUser merge(JIMUser detachedInstance) {
        log.debug("merging JIMUser instance");
        try {
            JIMUser result = (JIMUser) getSession()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }

    public void attachDirty(JIMUser instance) {
        log.debug("attaching dirty JIMUser instance");
        try {
            getSession().saveOrUpdate(instance);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    }
    
    public void attachClean(JIMUser instance) {
        log.debug("attaching clean JIMUser instance");
        try {
            getSession().lock(instance, LockMode.NONE);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    }
    
    public void update(JIMUser instance){
    	log.debug("update changed JIMUser instance");
    	try{
    		getSession().update(instance);
    		log.debug("update successful");
    	}catch (RuntimeException re){
    		log.error("update failed",re);
    		throw re;
    	}
    }
    
    public List<JIMUser> findFriendsById(Integer id){
    	log.debug("find friends by id: "+id);
    	try{
    		String query = "select {A.*} from JIMUSER A join FRIENDSHIP B on (B.masterno='"
    			+ id
    			+ "' and B.subno=A.jimno)";
    		List results = getSession().createSQLQuery(query)
    			.addEntity("A", JIMUser.class)
    		.list();
    		log.debug("find friends by id successful");
    		return results;
        } catch (RuntimeException re) {
            log.error("find friends by id failed", re);
            throw re;
        }
    }
    
}