[linux]samba mount

install:

sudo apt-get install samba

edit:

vim /etc/samba/smb.conf

path = /opt #share path

writable = yes

guest account = root

force user = root

public = yes

force group = root

ref:

http://flykof.pixnet.net/blog/post/23028119-ubuntu%E4%B8%8Bsamba%E5%AE%89%E8%A3%9D%E8%A8%AD%E5%AE%9A

http://ottoshare.blogspot.tw/2012/03/samba-linux-windows.html

Hibernate Eager vs Lazy Fetch Type

  @OneToOne(fetch=FetchType.EAGER) //LAZY
  @JoinColumn(name="user_profile_id")
  private Profile getUserProfile()
  {
   return userProfile;
  }

 FetchType.LAZY = Doesn’t load the relationships 
 unless explicitly “asked for” via getter
 FetchType.EAGER = Loads ALL relationships

ref:
https://m.oschina.net/blog/327056
https://howtoprogramwithjava.com/hibernate-eager-vs-lazy-fetch-type/

Hibernate paging get error result if row have same value

Query queryHot = session.createQuery(
   "from HotPost ORDER BY popularity DESC");

queryHot.setFirstResult((page - 1) * pageSize);
queryHot.setMaxResults(pageSize);

solve:
Query queryHot = session.createQuery(
   "from HotPost ORDER BY popularity DESC,id");
==================================
Before:
id   popularity 
1     9   |
2     8   |  page 1
3     8   |

5     8   |
6     7   |  page 2
7     5   |

AFTER:
id   popularity 
1     9  |
2     8  |  page 1
3     8  |

4     8  |
5     7  |  page 2
6     5  |

Hibernate one-to-one mapping cautions

正確用法
@OneToOne(mappedBy = "post")
@JsonView(View.Detail.class)
private HotPost hotPost;

一開始犯傻
@OneToOne(mappedBy = "post")
@JsonView(View.Detail.class)
Set hotpost = new HashSet<>(0);
CautionsCautionsCautions
log只會說:Unknown mappedBy in: com.ws.pojo.Post.hotPost, referenced property unknown: java.util.Set.post


but @OneToMany
remember to use Set

ref:

http://www.mkyong.com/hibernate/hibernate-one-to-one-relationship-example-annotation/

http://viralpatel.net/blogs/hibernate-one-to-one-mapping-tutorial-using-annotation/

http://stackoverflow.com/questions/25756993/difference-between-one-to-one-vs-many-to-one-with-unique-true

http://www.tutorialspoint.com/hibernate/hibernate_one_to_one_mapping.htm

Hibernate batch process

 //in pojo (java bean)
      @BatchSize(size=5)
------------------------------------------------
      public void insertOldPost2HotPost() throws Exception{
       
       Session session = sessionFactory.getCurrentSession();

        @SuppressWarnings("unchecked")
        List posts = session.createQuery("from Post ").list();
        int itCount=0;
        for(Iterator it = posts.iterator(); it.hasNext(); ) {

            itCount++;

            Post post = (Post) it.next();

            HotPost hotPost = new HotPost(post);
            session.saveOrUpdate(hotPost);

            if (itCount % 5 == 0) {
            
                session.flush();
                session.clear();
            }
        }
    }

ref:

http://www.concretepage.com/hibernate/batch_size_hibernate_annotation

http://www.tutorialspoint.com/hibernate/hibernate_batch_processing.htm

Spring MVC @JsonView使用详解

     public class View {
      interface Summary {}
      interface SummaryWithDetail extends Summary{}
    }
    -----------------------------------
    public class User {
      @JsonView(View.Summary.class)
      private Long id;
      @JsonView(View.SummaryWithDetail.class)
      private String firstname;
    }
    -----------------------------------
    @RequestMapping("/user")［
    @JsonView(View.Summary.class)
    //or @JsonView(View.SummaryWithDetail.class)
    public List getUsers(){
     return userService.listUsers();
    }
    -----------------------------------
    result of @JsonView(View.Summary.class)
    [
     {
        "id": 70,
     }
    ]

    result of @JsonView(View.SummaryWithDetail.class)
    [
     {
        "id": 70,
        "firstname": 222
     }
    ]

Hibernate openSession() vs getCurrentSession()

      SessionFactory.openSession():

      always opens a new session that you have to

      close once you are done with the operations.

     

      SessionFactory.getCurrentSession():

      returns a session bound to a context - you don't need to close this. 

     

      should always use "one session per request" or "one session per transaction"

      In one application, if the DAO layer, using Spring hibernate,

      control the life cycle via Spring session to ,

      First choice  getCurrentSession ().