public interface IDao<T> {
public <A extends Serializable> T getElementByID(A x);
public Long getRowsCount();
public List<T> getAll();
public List<T> getAll(String order);
public void saveOrUpdateElement(T x);
public void updateElement(T x);
public void saveElement(T x);
public void deleteElement(T x);
public void setClase(Class<T> clase);
public Class<T> getClase();
public void mergeElement(T x);
public T getFirst();
}
方法 public void setClase(Class clase);让一切变得神奇，所以如果你需要查询 x 那么你设置类，并且 getAll() 的实现将是
public List<T> getAll(){
return session.createQuery("from "+getClase().getSimpleName()).list();
}
you could use generics and reflection to make something like that
public interface IDao<T> {
public <A extends Serializable> T getElementByID(A x);
public Long getRowsCount();
public List<T> getAll();
public List<T> getAll(String order);
public void saveOrUpdateElement(T x);
public void updateElement(T x);
public void saveElement(T x);
public void deleteElement(T x);
public void setClase(Class<T> clase);
public Class<T> getClase();
public void mergeElement(T x);
public T getFirst();
}
the method public void setClase(Class clase); make all de magic so if you need to query to x then you set the class and the implementaton for example of getAll() will be
public List<T> getAll(){
return session.createQuery("from "+getClase().getSimpleName()).list();
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评论（3）
Telosys Tools 专为此类任务而设计
它从数据库模型生成代码
请参阅https://sites.google.com/site/telosystools/
您可以使用本教程的一部分https://sites.google.com/site/telosystutorial/springmvc-jpa-springdatajpa 仅生成 JPA 部分
您还可以创建自己的模板以满足您自己的需求（或调整现有模板）
Telosys Tools is designed for this kind of task
It generates code from the database model
See https://sites.google.com/site/telosystools/
You can use a part of this tutorial https://sites.google.com/site/telosystutorial/springmvc-jpa-springdatajpa to generate only the JPA part
You can also create your own templates in order to match you own needs (or adapt existing templates)
你可以使用泛型和反射来制作类似的东西
}
方法 public void setClase(Class clase);让一切变得神奇，所以如果你需要查询 x 那么你设置类，并且 getAll() 的实现将是
}
you could use generics and reflection to make something like that
}
the method public void setClase(Class clase); make all de magic so if you need to query to x then you set the class and the implementaton for example of getAll() will be
}
查看 Spring-Data-JPA 或 Spring ROO
Take a look at Spring-Data-JPA or Spring ROO