问题

I have a problem with the MATCH AGAINST function.

The following query give me the same result:

SELECT * FROM models MATCH(name) AGAINST('Fiat 500')
SELECT * FROM models MATCH(name) AGAINST('Fiat')

How can I search for both strings and numbers in a column of a FULL TEXT table?

Thanks

回答1:

If you need Fiat and 500 anywhere where order does not matter, then

SELECT * FROM models MATCH(name) AGAINST('+Fiat +500');

If you need Fiat 500 together, then

SELECT * FROM models MATCH(name) AGAINST('+"Fiat 500"');

If you need Fiat and zero or more 500, then

SELECT * FROM models MATCH(name) AGAINST('+Fiat 500');

If you need 500 and zero or more Fiat, then

SELECT * FROM models MATCH(name) AGAINST('Fiat +500');

Give it a Try !!!

UPDATE 2013-01-28 18:28 EDT

Here are the default settings for FULLTEXT searching

mysql> show variables like 'ft%';
+--------------------------+----------------+
| Variable_name            | Value          |
+--------------------------+----------------+
| ft_boolean_syntax        | + -><()~*:""&| |
| ft_max_word_len          | 84             |
| ft_min_word_len          | 4              |
| ft_query_expansion_limit | 20             |
| ft_stopword_file         | (built-in)     |
+--------------------------+----------------+
5 rows in set (0.00 sec)

mysql>

Notice that ft_min_word_len is 4 by default. The token 500 is length 3. thus it will not be indexed at all. You will have to do three(3) things:

STEP 01 : Configure for smaller string tokens

Add this to /etc/my.cnf

[mysqld]
ft_min_word_len = 1

STEP 02 : Restart mysql

service mysql restart

STEP 03 : Reindex all indexes in the `models` table

You could just drop and add the FULLTEXT index

or do it in stages and see how big it will get in advance

CREATE TABLE models_new LIKE models;
ALTER TABLE models_new DROP INDEX name;
ALTER TABLE models_new ADD FULLTEXT name (name);
ALTER TABLE models_new DISABLE KEYS;
INSERT INTO models_new SELECT * FROM models;
ALTER TABLE models_new ENABLE KEYS;
ALTER TABLE models RENAME models_old;
ALTER TABLE models_new RENAME models;

When you are satisfied this worked, then run

DROP TABLE models_old;

Give it a Try !!!

回答2:

Just in case it helps others, if you're using InnoDB you need to use a different set of mysql.cnf properties

show variables like 'innodb_ft%';

and in my.cnf set the following value instead of ft_min_word_len

innodb_ft_min_token_size=1

来源：https://stackoverflow.com/questions/14572375/mysql-search-for-string-and-number-using-match-against

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match-against

Mysql search for string and number using MATCH() AGAINST()

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