如何在MySQL查询中使用ORDER BY时忽略特殊字符

Question

I have the following MySQL query that provides data to a Python web page. On the web page, I have a list of song titles, and I want it to be alphabetized ignoring punctuation and spaces. My MySQL database is UTF-8 encoded, and some of the punctuation that needs to be ignored is special characters such as curly apostrophes, etc.

SELECT * FROM Tracks\
JOIN Artists USING (ArtistID)\
JOIN Albums USING (AlbumID)\
JOIN Songs USING (SongID)\
ORDER BY UPPER(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(\
REPLACE(SoName, ' ', ''), /* space */\
                        ',', ''), /* comma */\
                        '.', ''), /* period */\
                        ':', ''), /* colon */\
                        ';', ''), /* semicolon */\
                        '!', ''), /* exclamation point */\
                        '?', ''), /* question mark */\
                   '\u201c', ''), /* left curly double quote */\
                   '\u201d', ''), /* right curly double quote */\
                   '\u2019', ''), /* right curly single quote (apostrophe) */\
                   '\u2013', ''), /* n-dash */\
                   '\u2014', ''), /* m-dash */\
                   '\u2026', '') /* ellipsis */), (SongID), UPPER(AlTitle)

The REPLACE in my query seems to work perfectly for the non-special characters, like the space, comma, period, etc., but it seems to skip over the special characters.

My guess is that the characters need to be written in a different format. I tried the following with no success: REPLACE(SoName, '\…', '') REPLACE(SoName, u'\\2026', '') REPLACE(SoName, 0xE280A6, '') ...

Answer 1

MySQL string literals do not provide an escape sequence for multi-byte characters. This has been a feature request for over 7 years and is still awaiting triage: I wouldn't hold my breath that it will be resolved any time soon.

You must either put the actual character in your string literal, or else know its constituent bytes in your desired encoding (in which case you could then use something like CHAR() ).

Answer 2

My brother told me to put this at the very top of the Python page that contains the MySQL query:

from __future__ import unicode_literals

Everything seems to work now!