Mysql8 全文索引（中文）

1.创建索引

ALTER TABLE test ADD FULLTEXT INDEX ft_index (text) WITH PARSER ngram;

2.使用索引

-- IN NATURAL LANGUAGE MODE 自然语言全文索引

SELECT
    *, MATCH (text) AGAINST ('李 ' IN NATURAL LANGUAGE MODE) AS score    
FROM test WHERE MATCH (text) AGAINST ('李 ' IN NATURAL LANGUAGE MODE)
ORDER BY
    score DESC;

-- IN BOOLEAN MODE   布尔全文索引

SELECT id,text,
MATCH (text) AGAINST ('+李' IN BOOLEAN MODE) AS score
FROM test
ORDER BY score DESC;

3.查看词距 默认2 取值1-10

show variables like '%ngram_token_size%';

4.调整词距

vim /etc/my.cnf
[mysqld]
ngram_token_size=2

5.配置停用词

--查看默认停用词

select * from information_schema.INNODB_FT_DEFAULT_STOPWORD;

-- 自定义停用词库

CREATE TABLE my_stopwords(value VARCHAR(18));

-- 配置自定义停用词库

SET GLOBAL innodb_ft_server_stopword_table = 'test211008/my_stopwords'；