本文介绍了拆分 php mysql 后的关键字的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个表存储帖子 ID,它的标签如下:
i have one table store post id and it's tags like :
Post_id | Tags
--------------------------------------
1 | keyword1,keyword2,keyword3
我想遍历此表中的每一行并执行:
I want to loop though each row at this table and do :
将keyword1,keyword2,keyword3放入新表中:
put the keyword1,keyword2,keyword3 in new table :
word_id | word_value
-------------------------
1 | keyword1
2 | keyword2
3 | keyword3
获取 mysql_insert_id() foreach(或者如果 word_value 已经存在,则存在 word_id)然后放入新表中,例如:
get mysql_insert_id() foreach (or exist word_id if word_value already there) and then put in the new table like :
post_id | word_id
------------------
1 | 1
1 | 2
1 | 3
我已经使用 php 和 mysql 来完成这项任务,但这很慢.有人有好主意吗?
I've using php and mysql for do that task but this is slowly. Anyone have good idea?
推荐答案
做这样的事情:
-- 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;
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