mots-clés split pour le post php mysql

Question

i ai id post magasin une table et il est des balises comme:

Post_id | Tags 
-------------------------------------- 
1  | keyword1,keyword2,keyword3 

Je veux faire une boucle si chaque ligne à cette table et à faire:

• mis la keyword1, keyword2, dans le nouveau mot clé3 table:

  word_id | word_value 
  ------------------------- 
      1  | keyword1 
      2  | keyword2  
      3  | keyword3 
  

• get mysql_insert_id() foreach (ou si word_value word_id existent déjà là-bas), puis mettre dans la nouvelle table comme:

  post_id | word_id 
  ------------------ 
  1  | 1  
  1  | 2  
  1  | 3 
  

J'ai en utilisant PHP et MySQL pour faire cette tâche, mais cela est lentement. Quelqu'un a une bonne idée?

Answer 1

faire quelque chose comme ceci:

-- TABLES 

drop table if exists post_tags; 
create table post_tags 
(
post_id int unsigned not null auto_increment primary key, 
tags_csv varchar(1024) not null 
) 
engine=innodb; 

drop table if exists keywords; 
create table keywords 
(
keyword_id mediumint unsigned not null auto_increment primary key, 
name varchar(255) unique not null 
) 
engine=innodb; 


-- optimised for queries such as - select all posts that have keyword 3 

drop table if exists post_keywords; 
create table post_keywords 
(
keyword_id mediumint unsigned not null, 
post_id int unsigned not null, 
primary key (keyword_id, post_id), -- clustered composite PK ! 
key (post_id) 
) 
engine=innodb; 

-- STORED PROCEDURES 


drop procedure if exists normalise_post_tags; 

delimiter # 

create procedure normalise_post_tags() 
proc_main:begin 

declare v_cursor_done tinyint unsigned default 0; 

-- watch out for variable names that have the same names as fields !! 

declare v_post_id int unsigned; 
declare v_tags_csv varchar(1024); 
declare v_keyword varchar(255); 

declare v_keyword_id mediumint unsigned; 

declare v_tags_done tinyint unsigned; 
declare v_tags_idx int unsigned; 

declare v_cursor cursor for select post_id, tags_csv from post_tags order by post_id; 
declare continue handler for not found set v_cursor_done = 1; 

set autocommit = 0; 

open v_cursor; 
repeat 

    fetch v_cursor into v_post_id, v_tags_csv; 

    -- split the out the v_tags_csv and insert 

    set v_tags_done = 0;  
    set v_tags_idx = 1; 

    while not v_tags_done do 

    set v_keyword = substring(v_tags_csv, v_tags_idx, 
     if(locate(',', v_tags_csv, v_tags_idx) > 0, 
     locate(',', v_tags_csv, v_tags_idx) - v_tags_idx, 
     length(v_tags_csv))); 

     if length(v_keyword) > 0 then 

     set v_tags_idx = v_tags_idx + length(v_keyword) + 1; 

     set v_keyword = trim(v_keyword); 

     -- add the keyword if it doesnt already exist 
     insert ignore into keywords (name) values (v_keyword); 

     select keyword_id into v_keyword_id from keywords where name = v_keyword; 

     -- add the post_keywords 
     insert ignore into post_keywords (keyword_id, post_id) values (v_keyword_id, v_post_id); 

     else 
     set v_tags_done = 1; 
     end if; 

    end while; 

until v_cursor_done end repeat; 

close v_cursor; 

commit; 

end proc_main # 


delimiter ; 


-- TEST DATA 

insert into post_tags (tags_csv) values 
('keyword1,keyword2,keyword3'), 
('keyword1,keyword5'), 
('keyword4,keyword3,keyword6,keyword1'); 

-- TESTING 

call normalise_post_tags(); 

select * from post_tags order by post_id; 
select * from keywords order by keyword_id; 
select * from post_keywords order by keyword_id, post_id; 

Answer 2

pour chaque mot-clé, faire

insert into newtable (id, keyword) select id, 'aKeyword' from oldtable where oldtable.keywords like '%aKeyword%' 

si oldtable.keywords est juste un VARCHAR ou

insert into newtable (id, keyword) select id, 'aKeyword' from oldtable where FIND_IN_SET('aKeyword',keywords)>0 

si elle est un type SET .