标签:style blog color java 使用 io 数据 for
1、Dao层接口
package com.life.dao; import java.util.List; import java.util.Map; import org.hibernate.Query; public interface IDao<T> { /** * 根据id查找实体 * * @param clazz * @param id * @return */ public T find(Class<T> clazz, int id); public void create(T t); public void save(T t); public void delete(T t); /** * 查询某页实体 * @param hql 查询语句 * @param firstResult 从第几条开始,注意索引从0开始 * @param maxResults 最多返回的数据条数 * @param map 参数键值对 * @return */ public List<T> list(String hql, int firstResult, int maxResults, Map<String, Object> map); public Query getQuery(String hql, Map<String, Object> map); /** * 查询实体 * @param hql * @param map * @return */ List<T> list(String hql, Map<String, Object> map); /** * 获取记录总数 * @param hql * @param map * @return */ int getTotalCount(String hql, Map<String, Object> map); }
Dao层实现
package com.life.dao.impl; import java.util.Collection; import java.util.List; import java.util.Map; import java.util.Set; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import com.life.dao.IDao; public class DaoImpl<T> implements IDao<T> { private SessionFactory sessionFactory; @Override public T find(Class<T> clazz, int id) { // TODO Auto-generated method stub return (T) getSession().get(clazz, id); } @Override public void create(T t) { // TODO Auto-generated method stub getSession().persist(t); } @Override public void save(T t) { // TODO Auto-generated method stub getSession().saveOrUpdate(t); } @Override public void delete(T t) { // TODO Auto-generated method stub getSession().delete(t); } @Override public List<T> list(String hql, Map<String, Object> map) { // TODO Auto-generated method stub Query query = getQuery(hql, map); List<T> list = query.list(); return list; } @Override public int getTotalCount(String hql, Map<String, Object> map) { // TODO Auto-generated method stub Query query = getQuery(hql, map); System.out.println("hql"+hql); Object obj = query.uniqueResult(); return ((Long) obj).intValue(); } @Override public List<T> list(String hql, int firstResult, int maxResults, Map<String, Object> map) { // TODO Auto-generated method stub Query query = getQuery(hql, map); List<T> list = query.setFirstResult(firstResult) .setMaxResults(maxResults).list(); System.out.println("起始:"+firstResult); System.out.println("最大值:"+maxResults); System.out.println("实际值:"+list.size()); return list; } public Session getSession() { return sessionFactory.getCurrentSession(); } public SessionFactory getSessionFactory() { return sessionFactory; } public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } @Override public Query getQuery(String hql, Map<String, Object> map) { Query query = getSession().createQuery(hql); // TODO Auto-generated method stub if (map != null) { Set<String> keySet = map.keySet(); for (String string : keySet) { Object obj = map.get(string); //这里考虑传入的参数是什么类型,不同类型使用的方法不同 if(obj instanceof Collection<?>){ query.setParameterList(string, (Collection<?>)obj); }else if(obj instanceof Object[]){ query.setParameterList(string, (Object[])obj); }else{ query.setParameter(string, obj); } } } return query; } }
Service层接口
package com.life.service; import java.util.List; import java.util.Map; /** * 这个父接口不能作为bean在applicationContext.xml中,因为serviceImpl是虚函数 * * @author JL Service接口,基本方法 */ public interface IService<T> { /** * 根据id和对象类查找实体 */ public T find(Class<T> clazz, int id); /** * 创建实体 */ public void create(T t); /** * 保存实体 */ public void save(T t); /** * 删除实体 */ public void delete(T t); /** * 分页实体 */ public List<T> list(String hql, int firstResult, int maxResults, Map<String, Object> map); int getTotalCount(String hql, Map<String, Object> map); List<T> list(String hql, Map<String, Object> map); List<T> listPage(String hql, int page, int maxResults, Map<String, Object> map); }
Service层实现
package com.life.service.impl; import java.util.List; import java.util.Map; import com.life.dao.IDao; import com.life.service.IService; /** * 由于各个实体类的create()方法有不同的业务逻辑(例如创建用户前需要检查账号是否已经存在),所以把类定义成abstract * 把create()方法定义成abstract,由具体的Service单独实现 * @author JL */ public abstract class ServiceImpl<T> implements IService<T>{ /** * 通过spring的IoC注射进来 */ protected IDao<T> dao; public IDao<T> getDao() { return dao; } public void setDao(IDao<T> dao) { this.dao = dao; } @Override public T find(Class<T> clazz, int id) { // TODO Auto-generated method stub return dao.find(clazz, id); } @Override public void create(T t){ dao.create(t); }; @Override public void save(T t) { // TODO Auto-generated method stub dao.save(t); } @Override public void delete(T t) { // TODO Auto-generated method stub dao.delete(t); } @Override public List<T> list(String hql, Map<String, Object> map) { // TODO Auto-generated method stub return dao.list(hql, map); } @Override public int getTotalCount(String hql, Map<String, Object> map) { // TODO Auto-generated method stub return dao.getTotalCount(hql, map); } @Override public List<T> list(String hql, int firstResult, int maxResults, Map<String, Object> map) { // TODO Auto-generated method stub return dao.list(hql, firstResult, maxResults, map); } @Override public List<T> listPage(String hql, int page, int maxResults, Map<String, Object> map) { // TODO Auto-generated method stub return dao.list(hql, maxResults*(page-1), maxResults, map); } }
Done
SSH之Hibernate的Dao层和Service层,布布扣,bubuko.com
标签:style blog color java 使用 io 数据 for
原文地址:http://www.cnblogs.com/xingyyy/p/3893551.html