如何提取包含特定字符的MySQL表中csv列的成員？

Question

我在MySQL表格中有一列是格式爲csv的中文文本。我有興趣提取包含字符'*'的這些csv列表的成員。什麼是最簡單的方法來做到這一點？

Answer 1

我從來沒有做過類似的事情。正如你所看到的，我做了一個簡單的測試。 我不知道大記錄集的性能。

create table mytest (
id int not null auto_increment primary key, 
content varchar(100) 
) engine = myisam; 

insert into mytest (content) 
values 
('one,two*,three*text'), 
('four,five'), 
('six*,seven*,eight*'); 



delimiter // 
drop procedure if exists split_found // 
create procedure split_found() 
begin 
declare str varchar(200); 
declare ssql varchar(200); 
declare finito int default 0; 
declare cursore cursor for select content from mytest; 
declare continue handler for not found set finito = 1; 
drop temporary table if exists tmp; 
create temporary table tmp (cont varchar(50)); 
open cursore; 
mio_loop:loop 
fetch cursore into str; 
if finito = 1 then 
leave mio_loop; 
end if; 
set @ssql = concat("insert into tmp (cont) values ('", replace(str, ',', "'),('"), "')"); 
prepare stmt from @ssql; 
execute stmt; 
deallocate prepare stmt; 
end loop; 
close cursore; 
select * from tmp where cont like '%*%'; 
end; // 
delimiter ; 

mysql> call split_found(); 
+------------+ 
| cont  | 
+------------+ 
| two*  | 
| three*text | 
| six*  | 
| seven*  | 
| eight*  | 
+------------+ 
5 rows in set (0.01 sec)