Question

我有一个电影数据库，其中包含一部名为“我们是开放的”电影的信息。

在搜索数据库时，我遇到一个问题，其中搜索“是的我们打开”会返回另一个标题，其标题中包含“我们”和“打开”但不是“是”，即使我要求布尔模式中的所有单词（即“是的，我们打开”在它作为查询发送之前被翻译为'+yes +we\'re +open'）。

我认为这是因为“是”在内置的停用词列表中。但是，当我设置ft_stopword_file = ""，重启mysql，然后repair table [tablename] quick我正在搜索的表时，搜索“是的我们打开”时，我得不到任何结果。我把my.cnf包括在下面。这是MySQL版本5.0.22。有什么想法吗？

[mysqld]
query-cache-type = 1
query-cache-size = 8M
max_allowed_packet=500M
ft_min_word_len=2
ft_stopword_file = ""

[myisamchk]
ft_min_word_len=2

set-variable=local-infile=0
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
# old_passwords=1

skip-bdb

set-variable = innodb_buffer_pool_size=2M
set-variable = innodb_additional_mem_pool_size=500K
set-variable = innodb_log_buffer_size=500K
set-variable = innodb_thread_concurrency=2
[mysql.server]
user=mysql
basedir=/var/lib

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
skip-bdb

set-variable = innodb_buffer_pool_size=2M
set-variable = innodb_additional_mem_pool_size=500K
set-variable = innodb_log_buffer_size=500K
set-variable = innodb_thread_concurrency=2

编辑：以下是一些示例查询：

＃1 - 内置停用词文件

mysql> SHOW VARIABLES LIKE 'ft_%';
+--------------------------+----------------+
| Variable_name            | Value          |
+--------------------------+----------------+
| ft_boolean_syntax        | + -><()~*:""&| | 
| ft_max_word_len          | 84             | 
| ft_min_word_len          | 2              | 
| ft_query_expansion_limit | 20             | 
| ft_stopword_file         | (built-in)     | 
+--------------------------+----------------+
5 rows in set (0.00 sec)

mysql> SELECT title, MATCH(title,description,genre,country) AGAINST (' +yes +we\'re +open' IN BOOLEAN MODE) as title_description_genre_country_score FROM `films` WHERE MATCH(title,description,genre,country) AGAINST (' +yes +we\'re +open' IN BOOLEAN MODE) AND `hidden` <> '1' ORDER BY `title_description_genre_country_score` DESC ;
+-----------------+---------------------------------------+
| title           | title_description_genre_country_score |
+-----------------+---------------------------------------+
| Yes, We?re Open |                                     1 | 
| Present/Future  |                                     1 | 
+-----------------+---------------------------------------+
2 rows in set (0.00 sec)

....然后编辑my.cnf，添加ft_stopword_file="" .....

＃2没有停用词文件

mysql> SHOW VARIABLES LIKE 'ft_%';
+--------------------------+----------------+
| Variable_name            | Value          |
+--------------------------+----------------+
| ft_boolean_syntax        | + -><()~*:""&| | 
| ft_max_word_len          | 84             | 
| ft_min_word_len          | 2              | 
| ft_query_expansion_limit | 20             | 
| ft_stopword_file         |                | 
+--------------------------+----------------+
5 rows in set (0.00 sec)

mysql> REPAIR TABLE `films` QUICK;
+-------------------------+--------+----------+----------+
| Table                   | Op     | Msg_type | Msg_text |
+-------------------------+--------+----------+----------+
| db.films                | repair | status   | OK       | 
+-------------------------+--------+----------+----------+
1 row in set (0.14 sec)

mysql> SELECT title, MATCH(title,description,genre,country) AGAINST (' +yes +we\'re +open' IN BOOLEAN MODE) as title_description_genre_country_score FROM `films` WHERE MATCH(title,description,genre,country) AGAINST (' +yes +we\'re +open' IN BOOLEAN MODE) AND `hidden` <> '1' ORDER BY `title_description_genre_country_score` DESC ;
Empty set (0.00 sec)

编辑＃2：创建表格：

mysql> SHOW CREATE TABLE db.films\G;
*************************** 1. row ***************************
Table: films
Create Table: CREATE TABLE `films` (
  `id` varchar(8) NOT NULL default '',
  `title` varchar(255) default NULL,
  `hidden` tinyint(1) default '0',
  `featured` tinyint(1) default NULL,
  `type` varchar(255) default NULL,
  `subtype` varchar(255) default NULL,
  `summary` text,
  `description` text,
  `image_url` varchar(255) default NULL,
  `trailer_url` varchar(255) default NULL,
  `slug` varchar(255) default NULL,
  `category` varchar(255) default NULL,
  `parent` varchar(255) default NULL,
  `related` varchar(255) default NULL,
  `sponsor` varchar(255) default NULL,
  `genre` varchar(255) default NULL,
  `country` varchar(255) default NULL,
  `copresenters` varchar(255) default NULL,
  `original_title` varchar(255) default NULL,
  `director` varchar(255) default NULL,
  `executive_producer` varchar(255) default NULL,
  `producer` varchar(255) default NULL,
  `cinematographer` varchar(255) default NULL,
  `writer` varchar(255) default NULL,
  `editor` varchar(255) default NULL,
  `sound` varchar(255) default NULL,
  `cast` varchar(255) default NULL,
  `language` varchar(255) default NULL,
  `trt` varchar(255) default NULL,
  `year` varchar(255) default NULL,
  `subtitles` varchar(255) default NULL,
  `format` varchar(255) default NULL,
  `color` varchar(255) default NULL,
  `premiere_status` varchar(255) default NULL,
  PRIMARY KEY  (`id`),
  KEY `id` (`id`),
  KEY `type` (`type`),
  KEY `subtype` (`subtype`),
  KEY `slug` (`slug`),
  KEY `category` (`category`),
  KEY `parent` (`parent`),
  KEY `hidden` (`hidden`),
  KEY `featured` (`featured`),
  KEY `copresenters` (`copresenters`),
  KEY `original_title` (`original_title`),
  KEY `director` (`director`),
  KEY `executive_producer` (`executive_producer`),
  KEY `producer` (`producer`),
  KEY `cinematographer` (`cinematographer`),
  KEY `writer` (`writer`),
  KEY `editor` (`editor`),
  KEY `sound` (`sound`),
  KEY `cast` (`cast`),
  KEY `language` (`language`),
  KEY `trt` (`trt`),
  KEY `year` (`year`),
  KEY `subtitles` (`subtitles`),
  KEY `format` (`format`),
  KEY `color` (`color`),
  KEY `premiere_status` (`premiere_status`),
  FULLTEXT KEY `title` (`title`),
  FULLTEXT KEY `summary` (`summary`),
  FULLTEXT KEY `description` (`description`),
  FULLTEXT KEY `genre` (`genre`),
  FULLTEXT KEY `country` (`country`),
  FULLTEXT KEY `title,description` (`title`,`description`),
  FULLTEXT KEY `title,description,genre,country` (`title`,`description`,`genre`,`country`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row in set (0.00 sec)

Answer 1

将stopwords.txt变量设置为空字符串（''）将禁用所有stopword filtering。（删除一些你不需要的词......建议..）

由您创建的FULL TEXT SEARCH索引需要销毁并创建新索引。

更改此变量或停用词文件的内容后，必须重建FULLTEXT索引。

然后使用REPAIR TABLE tbl_name QUICK。

Answer 2

InnoDB不支持表修复（当您执行REPAIR TABLE tbl_name QUICK时可以看到注释。）

我唯一能解决的问题是将引擎更改为MyISAM，尽管这可能会降低READ或WRITE的性能。

如何在MySQL中禁用全文停用词：

在my.ini文本文件（MySQL）中：

ft_stopword_file = ""   or link an empty file "empty_stopwords.txt"
ft_min_word_len = 2

//设置最小长度，但要注意较短的单词（3,2）会大大增加查询时间，尤其是在全文索引列字段很大的情况下。

保存文件，重启服务器。

下一步应该是使用此查询修复索引：

REPAIR TABLE tbl_name QUICK.

但是，如果您使用的是InnoDB存储引擎，则无法使用此功能。您必须将其更改为MyISAM：

ALTER TABLE t1 ENGINE = MyISAM;

所以，再一次：

1. Edit my.ini file and save
2. Restart your server (this cannot be done dynamically)
3. Change the table engine (if needed)  ALTER TABLE tbl_name ENGINE = MyISAM;
4. Perform repair                       REPAIR TABLE tbl_name QUICK.

请注意InnoDB和MyISAM的速度差异。一个读取速度更快，其他写入速度更快（在互联网上阅读更多内容）

删除mysql ft_stopword_file后没有结果

2 个答案: