问题描述
我的web应用程序有很多服务表/实体,例如 payment_methods
, tax_codes
, province_codes
等等。
每次添加一个新实体时,我都必须编写一个DAO。事实是,基本上它们都是一样的,但唯一的区别是实体类本身。
我知道Hibernate工具可以自动为我生成代码,但现在我不能使用它们(不要问为什么),所以我正在考虑通用DAO 。有很多关于这方面的文献,但我不能把它们放在一起,并使它与Spring一起工作。我认为所有关于泛型的东西都会有四种基本方法:
-
listAll
-
saveOrUpdate
-
deleteById
-
getById
就是这样。
问题:
什么是最佳做法不重新发明轮子?
这里是我的
@Component
public class Dao {
@Resource(name =sessionFactory)
private SessionFactory sessionFactory;
public< T> T save(final T o){
return(T)sessionFactory.getCurrentSession()。save(o);
}
public void delete(final Object object){
sessionFactory.getCurrentSession()。delete(object);
}
/ *** /
public< T> T get(final Class< T> type,final Long id){
return(T)sessionFactory.getCurrentSession()。get(type,id);
}
/ *** /
public< T> T合并(final T o){
return(T)sessionFactory.getCurrentSession()。merge(o);
}
/ *** /
public< T> void saveOrUpdate(final T o){
sessionFactory.getCurrentSession()。saveOrUpdate(o);
}
public< T>列表与LT; T> getAll(final Class< T>类型){
final Session session = sessionFactory.getCurrentSession();
final Criteria crit = session.createCriteria(type);
返回crit.list();
}
//等等,你应该知道
和然后你可以在服务层访问:
@Autowired
private Dao dao;
@Transactional(readOnly = true)
public List< MyEntity> getAll(){
return dao.getAll(MyEntity.class);
}
My web application has got a lot of service tables/entities, such as payment_methods
, tax_codes
, province_codes
, etc.
Each time I add a new entity, I have to write a DAO. The thing is that, basically, they are all the same, but the only difference is the entity class itself.
I know that Hibernate tools can generate the code for me automatically but I can't use them now (don't ask why) so I'm thinking of a Generic DAO. There's a lot of literature about that but I can't put pieces together and make it work with Spring.
It's all about generics I think, it will have four basic methods:
listAll
saveOrUpdate
deleteById
getById
and that's all.
Question:
What's the best practice for not re-inventing the wheel? Isn't there something ready to use, yet?
here's mine
@Component
public class Dao{
@Resource(name = "sessionFactory")
private SessionFactory sessionFactory;
public <T> T save(final T o){
return (T) sessionFactory.getCurrentSession().save(o);
}
public void delete(final Object object){
sessionFactory.getCurrentSession().delete(object);
}
/***/
public <T> T get(final Class<T> type, final Long id){
return (T) sessionFactory.getCurrentSession().get(type, id);
}
/***/
public <T> T merge(final T o) {
return (T) sessionFactory.getCurrentSession().merge(o);
}
/***/
public <T> void saveOrUpdate(final T o){
sessionFactory.getCurrentSession().saveOrUpdate(o);
}
public <T> List<T> getAll(final Class<T> type) {
final Session session = sessionFactory.getCurrentSession();
final Criteria crit = session.createCriteria(type);
return crit.list();
}
// and so on, you shoudl get the idea
and you can then access like so in service layer:
@Autowired
private Dao dao;
@Transactional(readOnly = true)
public List<MyEntity> getAll() {
return dao.getAll(MyEntity.class);
}
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