tteacherdao.java

使用JSP+Servlet+Hibernate+Struts实现的一个学生软件发布平台

package edu.neu.sspp.hibernate;

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

/**
 * Data access object (DAO) for domain model class TTeacher.
 * @see edu.neu.sspp.hibernate.TTeacher
 * @author MyEclipse - Hibernate Tools
 */
public class TTeacherDAO extends BaseHibernateDAO {

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

	//property constants
	public static final String NAME = "name";
	public static final String PASSWORD = "password";
	public static final String REAL_NAME = "realName";
	public static final String EMAIL = "email";
	public static final String STUDENTS = "students";

    
    public void save(TTeacher transientInstance) {
        log.debug("saving TTeacher instance");
        try {
            getSession().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
	public void delete(TTeacher persistentInstance) {
        log.debug("deleting TTeacher instance");
        try {
            getSession().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
    
    public TTeacher findById( java.lang.String id) {
        log.debug("getting TTeacher instance with id: " + id);
        try {
            TTeacher instance = (TTeacher) getSession()
                    .get("edu.neu.sspp.hibernate.TTeacher", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    public int getCount() {
    	log.debug("getting count of TTeacher");
    	
    	try {
        	String queryString = "select count(*) from TTeacher";
        	Query queryObject = getSession().createQuery(queryString);
        	
        	return ((Integer)queryObject.list().get(0)).intValue();
    	} catch (RuntimeException re) {
    		log.error("getting count of TTeacher failed", re);
    		throw re;
    	}
    }
    
    public List getByPage(int first, int size) {
    	log.debug("getting TTeacher for page");
    	
    	try {
    		//按用户名排列
        	String queryString = "from TTeacher as teacher order by teacher.name";
        	Query queryObject = getSession().createQuery(queryString);
        	queryObject.setFirstResult(first);
        	//mysql似乎不支持setFetchSize，无法实现部分查询，只能通过setMaxResults在返回结果上控制
        	//queryObject.setFetchSize(size);
        	queryObject.setMaxResults(size);
        	return queryObject.list();
    	} catch(RuntimeException re) {
    		log.error("get by page failed", re);
    		throw re;
    	}
    }
    
    public List getAll() {
    	log.debug("getting all teachers");
    	
    	try {
        	String queryString = "from TTeacher";
        	Query queryObject = getSession().createQuery(queryString);
        	
        	return queryObject.list();
    	} catch(RuntimeException re) {
    		log.error("get all teachers failed", re);
    		throw re;
    	}
    }
    
    public List findByExample(TTeacher instance) {
        log.debug("finding TTeacher instance by example");
        try {
            List results = getSession()
                    .createCriteria("edu.neu.sspp.hibernate.TTeacher")
                    .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 TTeacher instance with property: " + propertyName
            + ", value: " + value);
      try {
         String queryString = "from TTeacher 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 findByName(Object name) {
		return findByProperty(NAME, name);
	}
	
	public List findByPassword(Object password) {
		return findByProperty(PASSWORD, password);
	}
	
	public List findByRealName(Object realName) {
		return findByProperty(REAL_NAME, realName);
	}
	
	public List findByEmail(Object email) {
		return findByProperty(EMAIL, email);
	}
	
	public List findByStudents(Object students) {
		return findByProperty(STUDENTS, students);
	}
	
    public TTeacher merge(TTeacher detachedInstance) {
        log.debug("merging TTeacher instance");
        try {
            TTeacher result = (TTeacher) getSession()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }

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