java 中 BaseDao 在Hibernate中的用法

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

import org.hibernate.Session;
import org.hibernate.SessionFactory;

public abstract class BaseDao<T> {
private SessionFactory sessionFactory;

private Class clazz;

public BaseDao() {
super();
clazz = getParameterizedTypeByParent(super.getClass());
}

private Class getParameterizedTypeByParent(Class clazz) {
Type tp = clazz.getGenericSuperclass();
if (tp instanceof ParameterizedType) {
return (Class) ((ParameterizedType) tp).getActualTypeArguments()[0];
} else {
throw new ClassCastException("this is not ParameterizedType type");
}
}

public SessionFactory getSessionFactory() {
return sessionFactory;
}

public void setSessionFactory(SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory;
}

public List findAll() {
List results = getSession().createCriteria(clazz).list();
return results;
}

public T findById(Integer id) {
T result = (T) getSession().get(clazz, id);
return result;
}

public void update(T obj) {
getSession().save(obj);
}

private Session getSession() {
return sessionFactory.getCurrentSession();
}
}

你可能感兴趣的:(Hibernate)