package com.atguigu.surveypark.dao.impl;

import java.lang.reflect.ParameterizedType;

import java.util.List;

import javax.annotation.Resource;

import org.hibernate.Query;

import org.hibernate.SessionFactory;

import com.atguigu.surveypark.dao.BaseDao;

/**

 * 抽象的dao实现,专门用于继承

 */

@SuppressWarnings("unchecked")

public abstract class BaseDaoImpl<T> implements BaseDao<T> {

	//注入sessionFactory

	@Resource

	private SessionFactory sf ;

	private Class<T> clazz ;

	public BaseDaoImpl(){

		//得到泛型话超类

		ParameterizedType type = (ParameterizedType) this.getClass().getGenericSuperclass();

		clazz = (Class<T>) type.getActualTypeArguments()[0];

	}

	public void saveEntity(T t) {

		sf.getCurrentSession().save(t);

	}

	public void saveOrUpdateEntity(T t) {

		sf.getCurrentSession().saveOrUpdate(t);

	}

	public void updateEntity(T t) {

		sf.getCurrentSession().update(t);

	}

	public void deleteEntity(T t) {

		sf.getCurrentSession().delete(t);

	}

	/**

	 * 按照HQL语句进行批量更新

	 */

	public void batchEntityByHQL(String hql, Object... objects) {

		Query q = sf.getCurrentSession().createQuery(hql);

		for(int i = 0 ; i < objects.length ; i ++){

			q.setParameter(i, objects[i]);

		}

		q.executeUpdate();

	}

	public T loadEntity(Integer id) {

		return (T) sf.getCurrentSession().load(clazz, id);

	}

	public T getEntity(Integer id) {

		return (T) sf.getCurrentSession().get(clazz, id);

	}

	public List<T> findEntityByHQL(String hql, Object... objects) {

		Query q = sf.getCurrentSession().createQuery(hql);

		for(int i = 0 ; i < objects.length ; i ++){

			q.setParameter(i, objects[i]);

		}

		return q.list();

	}

}