hibernate框架BaseDao，hibernatebasedao,做web开发的过程中估计

hibernate框架BaseDao，hibernatebasedao,做web开发的过程中估计

做web开发的过程中估计会有80%-90%是和数据库打交道的，因此Dao层起了关键的作用。而每个实体类对应一个dao太麻烦，不能快速的开发。本文的基本DAO是于hibernate与java的反射机制编写的。虽然网上也有很多不同的写法，各有各的想法么！对不对。```java

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();}

}

```