Hibernate反向工程生成DAO

package dao;

import java.util.List;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.criterion.Example;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A data access object (DAO) providing persistence and search support for
 * Student entities. Transaction control of the save(), update() and delete()
 * operations can directly support Spring container-managed transactions or they
 * can be augmented to handle user-managed Spring transactions. Each of these
 * methods provides additional information for how to configure it for the
 * desired type of transaction control.
 * 
 * @see dao.Student
 * @author MyEclipse Persistence Tools
 */

public class StudentDAO extends BaseHibernateDAO {
    private static final Logger log = LoggerFactory.getLogger(StudentDAO.class);
    // property constants
    public static final String SNAME = "sname";
    public static final String EMAIL = "email";

    public void save(Student transientInstance) {
        log.debug("saving Student instance");
        try {
            getSession().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }

    public void delete(Student persistentInstance) {
        log.debug("deleting Student instance");
        try {
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }

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

    public List findByExample(Student instance) {
        log.debug("finding Student instance by example");
        try {
            List results = getSession().createCriteria("dao.Student")
                    .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 Student instance with property: " + propertyName
                + ", value: " + value);
        try {
            String queryString = "from Student 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 findBySname(Object sname) {
        return findByProperty(SNAME, sname);
    }

    public List findByEmail(Object email) {
        return findByProperty(EMAIL, email);
    }

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

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

    public void attachDirty(Student instance) {
        log.debug("attaching dirty Student instance");
        try {
            getSession().saveOrUpdate(instance);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    }

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