用ssh做了一个供初学者使用学习的例子

package com.dao; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.LockMode; import org.springframework.context.ApplicationContext; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; /** * A data access object (DAO) providing persistence and search support for * Students 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 com.dao.Students * @author MyEclipse Persistence Tools */ public class StudentsDAO extends HibernateDaoSupport { private static final Log log = LogFactory.getLog(StudentsDAO.class); protected void initDao() { // do nothing } public void save(Students transientInstance) { log.debug("saving Students instance"); try { getHibernateTemplate().save(transientInstance); log.debug("save successful"); } catch (RuntimeException re) { log.error("save failed", re); throw re; } } public void delete(Students persistentInstance) { log.debug("deleting Students instance"); try { getHibernateTemplate().delete(persistentInstance); log.debug("delete successful"); } catch (RuntimeException re) { log.error("delete failed", re); throw re; } } public Students findById(java.lang.Integer id) { log.debug("getting Students instance with id: " + id); try { Students instance = (Students) getHibernateTemplate().get( "com.dao.Students", id); return instance; } catch (RuntimeException re) { log.error("get failed", re); throw re; } } public List findByExample(Students instance) { log.debug("finding Students instance by example"); try { List results = getHibernateTemplate().findByExample(instance); 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 Students instance with property: " + propertyName + ", value: " + value); try { String queryString = "from Students as model where model." + propertyName + "= ?"; return getHibernateTemplate().find(queryString, value); } catch (RuntimeException re) { log.error("find by property name failed", re); throw re; } } public List findAll() { log.debug("finding all Students instances"); try { String queryString = "from Students"; return getHibernateTemplate().find(queryString); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public Students merge(Students detachedInstance) { log.debug("merging Students instance"); try { Students result = (Students) getHibernateTemplate().merge( detachedInstance); log.debug("merge successful"); return result; } catch (RuntimeException re) { log.error("merge failed", re); throw re; } } public void attachDirty(Students instance) { log.debug("attaching dirty Students instance"); try { getHibernateTemplate().saveOrUpdate(instance); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public void attachClean(Students instance) { log.debug("attaching clean Students instance"); try { getHibernateTemplate().lock(instance, LockMode.NONE); log.debug("attach successful"); } catch (RuntimeException re) { log.error("attach failed", re); throw re; } } public List findClass(String name) { log.debug("finding all Students instances"); try { String queryString = "from Students where name='"+name+"'"; return getHibernateTemplate().find(queryString); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public List findstudents(Integer cl) { log.debug("finding all Students instances"); try { String queryString = "from Students as stu where stu.classes="+cl+""; return getHibernateTemplate().find(queryString); } catch (RuntimeException re) { log.error("find all failed", re); throw re; } } public static StudentsDAO getFromApplicationContext(ApplicationContext ctx) { return (StudentsDAO) ctx.getBean("StudentsDAO"); } }