使用正则表达式的UPDATE SQL语句

Question

I have 2 tables, one named pictures and another named media, in table pictures I have the field description which contains some text, In table media there is the row url that I would like to update. I need to write an sql query that updates row url in table media that uses regex for an specific string in description from table pictures , can this be done with one sql query?

Answer 1

You can use REGEXP to search for strings but you cannot return the result. If that's alright then you could try something like this:

If your table is something like:

create table media(media_id int, url varchar(200));
create table pictures(pic_id int, media_id int, description text);

You could do something like this:

UPDATE pictures p
LEFT JOIN media m 
ON p.media_id = m.media_id
SET url='http://newurl.com/pic.jpg'
WHERE REGEXP '.*regexpString$';

If you need to just replace part of the URL you could try:

UPDATE pictures p
LEFT JOIN media m 
ON p.media_id = m.media_id
SET url=REPLACE(url, 'olddomain.com', 'newdomain.com')
WHERE REGEXP '.*regexpString$';