小编典典

-- drop table testproduct;

CREATE TABLE testproduct

(

Id VARCHAR(16),

prod_name TEXT,

ProductIdType VARCHAR(8),

PRIMARY KEY (Id),

FULLTEXT (prod_name)

) ENGINE=MyISAM;

insert into testproduct (id,prod_name,productidtype) values ('B00005N5PF','one pen and a good price for a pen','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('B570J5XS3C',null,'ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C00ZZ5N5PF','let us get rid of some noise','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('D00LL5N5PA','four score and seven years ago our fore...','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('EEEZZ5N5PF','he has a harpoon','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C01ZZ5N5PF','and then we','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('B00ZZ5N5PF','he has a pen in his pocket not a banana','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C02ZZ5N5PF','went to the store','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C03ZZ5N5PF','and decided that we should buy some','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C04ZZ5N5PF','fruit cups or fruit or berries or pebbles','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C037Z5N5PF','then he and her she and it','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('C04K95N5PF','threw some daggers and a harpoon','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('D88895N5PF','more noise and some of this','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('D34595N5PF','this article about harpoons really drills into the throwing of harpoon or harpoons to those that deserve a harpoon','ASIN');

insert into testproduct (id,prod_name,productidtype) values ('D12395N5PF','and there we go','ASIN');

全文搜索需要多种多样的方式来消除重复的“噪音”。用最少的数据进行测试将产生较差的结果。将您的整个收藏集投入其中，以获取有意义的内容。如以下某些链接所示，甚至可以尝试搜索最小字数的设置。

停用词

有各种语言的停用词

MySql 列表，这些词表示在搜索过程中忽略的无关紧要的词。该列表已编译到服务器中，但可以覆盖，如本手册页和文本所示：

要覆盖默认停用词列表，请设置ft_stopword_file系统变量。(请参见第5.1.4节“服务器系统变量”。)变量值应为包含停用词列表的文件的路径名，或为禁用停用词过滤的空字符串。除非给出绝对路径名以指定其他目录，否则服务器将在数据目录中查找文件。更改此变量的值或停用词文件的内容后，重新启动服务器并重建FULLTEXT索引。

一些样本查询

-- select * from testproduct

SELECT * FROM testproduct WHERE MATCH(prod_name) AGAINST('score' IN BOOLEAN MODE);

SELECT * FROM testproduct WHERE MATCH(prod_name) AGAINST('harpoon' IN BOOLEAN MODE);

SELECT * FROM testproduct WHERE MATCH(prod_name) AGAINST('banana' IN BOOLEAN MODE);

SELECT * FROM testproduct WHERE MATCH(prod_name) AGAINST('years' IN BOOLEAN MODE);

获得多个单词匹配：

SELECT id,prod_name, match( prod_name )

AGAINST ( '+harpoon +article' IN BOOLEAN MODE ) AS relevance

FROM testproduct

ORDER BY relevance DESC

在relevance列中给出实际权重：

SELECT id,prod_name, match( prod_name )

AGAINST ( '+harpoon +article' IN NATURAL LANGUAGE MODE) AS relevance

FROM testproduct

ORDER BY relevance DESC

+------------+--------------------------------------------------------------------------------------------------------------------+--------------------+

| id | prod_name | relevance |

+------------+--------------------------------------------------------------------------------------------------------------------+--------------------+

| D34595N5PF | this article about harpoons really drills into the throwing of harpoon or harpoons to those that deserve a harpoon | 3.6207125186920166 |

| EEEZZ5N5PF | he has a harpoon | 1.2845110893249512 |

| C04K95N5PF | threw some daggers and a harpoon | 1.2559525966644287 |

|------------+--------------------------------------------------------------------------------------------------------------------+--------------------+

从这里取消了多个单词部分。谢谢斯宾塞

2020-05-17