hibernate框架BaseDao详解编程语言

  
package com.gmxt.baseDao.baseDaoImpl; 
   
import java.lang.reflect.ParameterizedType; 
import java.util.Collections; 
import java.util.List; 
import javax.annotation.Resource; 
import org.hibernate.Query; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.springframework.transaction.annotation.Transactional; 
import com.gmxt.baseDao.BaseDao; 
import com.gmxt.common.Pagination; 
 
@Transactional 
@SuppressWarnings("unchecked") 
public abstract class BaseDaoImpl<T> implements BaseDao<T> { 
    @Resource 
    private SessionFactory sessionFactory; 
    protected Class<T> clazz; 
   
    public BaseDaoImpl() { 
        ParameterizedType type = (ParameterizedType) this.getClass() 
                .getGenericSuperclass(); 
        this.clazz = (Class) type.getActualTypeArguments()[0]; 
    } 
   
    public void delete(String id) { 
        Object object = (Object) getSession().get(clazz, id); 
        getSession().delete(object); 
    } 
   
    public T getById(String id) { 
        return (T) getSession().get(clazz, id); 
    } 
   
    public List<T> getAll() { 
        return getSession().createQuery("from " + clazz.getSimpleName()).list(); 
    } 
   
    public List<T> getByIds(String[] ids) { 
        if (ids == null || ids.length == 0) { 
            return Collections.EMPTY_LIST; 
        } 
        return getSession().createQuery( 
                "FROM " + clazz.getSimpleName() + " WHERE id IN(:ids)") 
                .setParameterList("ids", ids).list(); 
    } 
   
    public int getTotalCount() { 
        int totalCount = ((Long)getSession().createQuery("select count(*) from " + clazz.getSimpleName()).list().get(0)).intValue(); 
        return totalCount; 
    } 
   
    public String save(T entity) { 
        String id = (String) getSession().save(entity); 
        return id; 
    } 
   
    public void update(T entity) { 
        getSession().update(entity); 
    } 
       
    public int update(String hql,Object...field){ 
        System.out.println(hql); 
        for(Object obj : field){ 
            System.out.println(obj); 
        } 
        Query query = getSession().createQuery(hql); 
        if(field.length != 0){ 
            for(int i=0 ;i < field.length; i++){ 
                query.setParameter(i, field[i]); 
            } 
        } 
        return query.executeUpdate();        
    } 
   
    public Pagination getPagination(int pageNo, int pageSize) { 
        Pagination pagination = new Pagination(pageNo, pageSize, 
                getTotalCount()); 
        List<T> list = getSession() 
                .createQuery("from " + clazz.getSimpleName()).setFirstResult( 
                        pagination.getFirstResult()).setMaxResults( 
                        pagination.getPageSize()).list(); 
        pagination.setList(list); 
        return pagination; 
    } 
   
    protected Session getSession() { 
        return sessionFactory.getCurrentSession(); 
    } 
   
}