Generic DAO 是一个 Java 的轻量级 ORM 框架，允许开发者为持久化对象编写 DAO 类。

示例代码：

public class BlogLogicImpl implements BlogLogic {       private BlogWowDaoImpl dao;     public void setDao(BlogWowDaoImpl dao) {        this.dao = dao;     }       public BlogWowBlog getBlogByLocationAndUser(String locationId, String userId) {        List<BlogWowBlog> l = dao.findBySearch(BlogWowBlog.class, new Search("location", locationId) );          if (l.size() <= 0) {           // no blog found, create a new one           if (canWriteBlog(null, locationId, userId)) {              BlogWowBlog blog = new BlogWowBlog(userId, locationId, "Initial title", new Date());              dao.save(blog);              return blog;           }           return null;        } else if (l.size() >= 1) {           // found existing blog           return (BlogWowBlog) l.get(0);        }     }  ...  }

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