SSH整合的BaseDaoImpl.java

import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;


import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Projections;
import org.springframework.orm.hibernate5.support.HibernateDaoSupport;


public class BaseDaoImpl extends HibernateDaoSupport implements BaseDao {


	private Class clazz;//用于接收运行期泛型类型
	
	
	public BaseDaoImpl() {
		//获得当前类型的带有泛型类型的父类
		ParameterizedType ptClass = (ParameterizedType) this.getClass().getGenericSuperclass();
		//获得运行期的泛型类型
		clazz = (Class) ptClass.getActualTypeArguments()[0];
	}


	@Override
	public void save(T t) {
		getHibernateTemplate().save(t);
	}


	@Override
	public void delete(T t) {
		
		getHibernateTemplate().delete(t);
		
	}


	@Override
	public void delete(Serializable id) {
		T t = this.getById(id);//先取,再删
		getHibernateTemplate().delete(t);
	}


	@Override
	public void update(T t) {
		getHibernateTemplate().update(t);
	}


	@Override
	public T getById(Serializable id) {
		
		
		
		return (T) getHibernateTemplate().get(clazz, id);
	}


	@Override
	public Integer getTotalCount(DetachedCriteria dc) {
		//设置查询的聚合函数,总记录数
		dc.setProjection(Projections.rowCount());
		
		List list = (List) getHibernateTemplate().findByCriteria(dc);
		
		//清空之前设置的聚合函数
		dc.setProjection(null);
		
		if(list!=null && list.size()>0){
			Long count = list.get(0);
			return count.intValue();
		}else{
			return null;
		}
		
	}


	@Override
	public List getPageList(DetachedCriteria dc, Integer start, Integer pageSize) {
		
		List list = (List) getHibernateTemplate().findByCriteria(dc, start, pageSize);
		
		return list;
	}


}