如何在 MySql 中进行重音敏感搜索

Question

I have a MySQL table with utf8 general ci collation. In the table, I can see two entries:

abad
abád

I am using a query that looks like this:

SELECT *  FROM `words` WHERE `word` = 'abád'

The query result gives both words:

abad
abád

Is there a way to indicate that I only want MySQL to find the accented word? I want the query to only return

abád

I have also tried this query:

SELECT *  FROM `words` WHERE BINARY `word` = 'abád'

It gives me no results. Thank you for the help.

Answer 1

If your searches on that field are always going to be accent-sensitive, then declare the collation of the field as utf8_bin (that'll compare for equality the utf8-encoded bytes) or use a language specific collation that distinguish between the accented and un-accented characters.

col_name varchar(10) collate utf8_bin

If searches are normally accent-insensitive, but you want to make an exception for this search, try;

WHERE col_name = 'abád' collate utf8_bin

Answer 2

In my version (MySql 5.0), there is not available any utf8 charset collate for case insensitive, accent sensitive searches. The only accent sensitive collate for utf8 is utf8_bin. However it is also case sensitive.

My work around has been to use something like this:

SELECT * FROM `words` WHERE LOWER(column) = LOWER('aBád') COLLATE utf8_bin

Answer 3

Accepted answer is good, but beware that you may have to use COLLATE utf8mb4_bin instead!

WHERE col_name = 'abád' collate utf8mb4_bin

Above fixes errors like:

MySQL said: Documentation 1253 - COLLATION 'utf8_bin' is not valid for CHARACTER SET 'utf8mb4'

Answer 4

供以后参考的 MySQL 错误是http://bugs.mysql.com/bug.php?id=19567 。

Answer 5

Check to see if the database table collation type end with "_ci", This stands for case insensitive...

Change it to collation the same or nearest name without the "_ci" ...

For example... change "utf8_general_ci" to "utf8_bin" Mke

Answer 6

I was getting the same error.

I've changed the collation of my table to utf8_bin (through phpMyAdmin) and the problem was solved.

Answer 7

Well, you just described what utf8_general_ci collation is all about (a, á, à, â, ä, å all equals to a in comparison).

There have also been changes in MySQL server 5.1 in regards to utf8_general_ci and utf8_unicode_ci so it's server version dependent too. Better check the docs.

So, If it's MySQL server 5.0 I'd go for utf8_unicode_ci instead of utf8_general_ci which is obviously wrong for your use-case.

Answer 8

That works for me for an accent insensitive and case insensitive search in MySql server 5.1 in a database in utf8_general_ci, where column is a LONGBLOB.

select * from words where '%word%' LIKE column collate utf8_unicode_ci

with

select * from words where'%word%' LIKE column collate utf8_general_ci

the result is case sensitive but not accent sensitive.

Answer 9

SELECT *  FROM `words` WHERE column = 'abád' collate latin1_General_CS 

（或您的整理，包括 cs）

Answer 10

You can try searching for the hex variable of the character, HEX() within mysql and use a similar function within your programming language and match these. This worked well for me when i was doing a listing where a person could select the first letter of a person.