empdao.java

struts+hibernate做的一个程序

package com.po;

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

/**
 * Data access object (DAO) for domain model class Emp.
 * 
 * @see com.po.Emp
 * @author MyEclipse Persistence Tools
 */

public class EmpDAO extends BaseHibernateDAO {
	private static final Log log = LogFactory.getLog(EmpDAO.class);

	// property constants
	public static final String ENAME = "ename";

	public static final String SEX = "sex";

	public static final String ADDRESS = "address";

	public void save(Emp transientInstance) {
		log.debug("saving Emp instance");
		try {
			Transaction ts=getSession().beginTransaction();
			getSession().save(transientInstance);
			log.debug("save successful");
			ts.commit();
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Emp persistentInstance) {
		log.debug("deleting Emp instance");
		try {
			Transaction ts=getSession().beginTransaction();
			getSession().delete(persistentInstance);
			log.debug("delete successful");
			ts.commit();
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Emp findById(java.lang.Integer id) {
		log.debug("getting Emp instance with id: " + id);
		try {
			Emp instance = (Emp) getSession().get("com.po.Emp", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Emp instance) {
		log.debug("finding Emp instance by example");
		try {
			List results = getSession().createCriteria("com.po.Emp").add(
					Example.create(instance)).list();
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {
		log.debug("finding Emp instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Emp as model where model."
					+ propertyName + "= ?";
			Query queryObject = getSession().createQuery(queryString);
			queryObject.setParameter(0, value);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByEname(Object ename) {
		return findByProperty(ENAME, ename);
	}

	public List findBySex(Object sex) {
		return findByProperty(SEX, sex);
	}

	public List findByAddress(Object address) {
		return findByProperty(ADDRESS, address);
	}

	public List findAll() {
		log.debug("finding all Emp instances");
		try {
			String queryString = "from Emp";
			Query queryObject = getSession().createQuery(queryString);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Emp merge(Emp detachedInstance) {
		log.debug("merging Emp instance");
		try {
			Emp result = (Emp) getSession().merge(detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Emp instance) {
		log.debug("attaching dirty Emp instance");
		try {
			Transaction ts=getSession().beginTransaction();
			getSession().saveOrUpdate(instance);
			log.debug("attach successful");
			ts.commit();
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Emp instance) {
		log.debug("attaching clean Emp instance");
		try {
			getSession().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}
}