Mysql – Database design import massive csv files is there a more efficient way

I'd start off by trying to fix all the predetermined information in the model itself including

• dates/venues
• structure (ie group/knockout stages)
• rules (ie points scoring, tie-break rules)

Some of this information will be data in tables, some will be codified logic in views.

Something like this perhaps:

• team(team_id, group_code enum('A', 'B', 'C', 'D'), name)
• match(match_id, kickoff_at)
• group_match(match_id, team_id_home, team_id_away, group_code)
• knockout_match(match_id, knockout_code enum('Q1', 'Q2', 'Q3', 'Q4', 'S1', 'S2', 'F')
• result(match_id, score_home, score_away)

Information such which teams play in Q1 never needs to be stored directly because it can be calculated from the group stage results. The only changes to make as the tournament progresses are inserts into the result table.

You can change your post_order column to a float and update the value with a calculation using the post_order values from the posts you want to end up between.

Example:

PostID, PostOrder
1       1
2       2
3       3

If you want to move PostID = 3 to be sorted between 1 and 2 it would be

PostID, PostOrder
1       1
3       1.5
2       2

Here is a SQL Fiddle with some code that moves the posts using a stored procedure where you pass in the PostID of the post to be moved and PostID of the post you want to end up behind.

SQL Fiddle

MySQL 5.5.30 Schema Setup:

create table Post
(
  PostID int primary key,
  PostOrder float unsigned not null unique,
  check (PostOrder > 0)
);

insert into Post(PostID,  PostOrder) values (1, 1);
insert into Post(PostID,  PostOrder) values (2, 2);
insert into Post(PostID,  PostOrder) values (3, 3);
insert into Post(PostID,  PostOrder) values (4, 4);
insert into Post(PostID,  PostOrder) values (5, 5);
insert into Post(PostID,  PostOrder) values (6, 6);
insert into Post(PostID,  PostOrder) values (7, 7);
insert into Post(PostID,  PostOrder) values (8, 8);
insert into Post(PostID,  PostOrder) values (9, 9);
insert into Post(PostID,  PostOrder) values (10, 10);

//

create procedure MovePost(MovePostID int, AfterPostID int)
begin

  declare AfterPostOrder float;
  declare NextPostOrder float; 


  set AfterPostOrder = (select PostOrder 
                        from Post
                        where PostID = AfterPostID);

  if AfterPostOrder is null then
    -- Move first
    set AfterPostOrder = 0;
  end if;

  set NextPostOrder = (select min(PostOrder) 
                       from Post 
                       where PostOrder > AfterPostOrder);

  if NextPostOrder is null then
    -- Move last
    set NextPostOrder = (select max(PostOrder) + 2
                         from Post);
  end if;


  update Post
  set PostOrder = (AfterPostOrder + NextPostOrder) / 2
  where PostID = MovePostID;


end

Query 1:

call MovePost (7, 3);    -- Move 7 after 3
call MovePost (8, 3);    -- Move 8 after 3
call MovePost (9, null); -- Move 9 first
call MovePost (2, 10);   -- Move 2 after 10

select * 
from Post
order by PostOrder

Results:

| POSTID | POSTORDER |
----------------------
|      9 |       0.5 |
|      1 |         1 |
|      3 |         3 |
|      8 |      3.25 |
|      7 |       3.5 |
|      4 |         4 |
|      5 |         5 |
|      6 |         6 |
|     10 |        10 |
|      2 |        11 |