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java ssh DAO层增删改父类
java ssh DAO层增删改父类
增加代码的复用性,减少代码的书写量
接口
import java.util.List;
/**
* 通用Dao接口
* @author zhaoqx
*
*/
public interface IBaseDao<T> {
/**
* 添加
*/
public void save(T entity);
/**
* 根据id删除
*/
public void delete(Long id);
/**
* 根据id修改
*/
public void update(T entity);
/**
* 根据id查询
*/
public T getById(Long id);
/**
* 一次查询多个对象
*/
public List<T> getByIds(Long[] ids);
/**
* 查询所有
*/
public List<T> findAll();
}
实现
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;
import javax.annotation.Resource;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate3.HibernateTemplate;
import cn.itcast.oa.domain.Book;
/**
* 通用Dao实现
* @author zhaoqx
*
* @param <T>
*/
@SuppressWarnings("unchecked")
public class BaseDaoImpl<T> implements IBaseDao<T> {
@Resource
private SessionFactory sessionFactory;
private Class<T> clazz;
public BaseDaoImpl() {
//获得实体类型
ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass();//获得真正的父类
Type[] types = genericSuperclass.getActualTypeArguments();
clazz = (Class<T>) types[0];
}
public void save(T entity) {
getSession().save(entity);
}
public void delete(Long id) {
getSession().delete(getSession().get(clazz, id));
}
public void update(T entity) {
getSession().update(entity);
}
public List<T> findAll() {
String hql = "FROM " + clazz.getSimpleName();
return getSession().createQuery(hql).list();
}
public T getById(Long id) {
return (T) getSession().get(clazz, id);
}
public List<T> getByIds(Long[] ids) {
String hql = "FROM " + clazz.getSimpleName() + " WHERE id in (:ids)";
Query query = getSession().createQuery(hql);
query.setParameterList("ids", ids);//一次赋值多个
return query.list();
}
public Session getSession(){
return sessionFactory.getCurrentSession();
}
}
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