輕量級 ORM 框架 Generic DAO

Generic DAO 是一個 Java 的輕量級 ORM 框架，允許開發者為持久化對象編寫 DAO 類。

示例代碼：

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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