本篇内容介绍了“MySQL fulltext index检索中文有哪些注意事项”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
 
1、查看表结构
 
mysql> show create table product_test02;
| Table                | Create Table   
| product_test02 | CREATE TABLE `product_test02` (
  `product_id` varchar(40) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
  `artisan_id` varchar(40) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `name` varchar(60) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
  `des` varchar(1000) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL DEFAULT '',
  `zhima_price` double(11,2) DEFAULT NULL,
  `market_price` double(11,2) DEFAULT NULL,
  `cover_pic` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `work_time` int(11) DEFAULT NULL,
  `comment_count` int(11) DEFAULT NULL,
  `like_count` int(11) DEFAULT NULL,
  `produt_consist` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `keep_time` int(11) DEFAULT NULL,
  `create_at` timestamp NULL DEFAULT NULL,
  `fav_count` int(11) DEFAULT NULL,
  `width` int(11) DEFAULT NULL,
  `height` int(11) DEFAULT NULL,
  `is_publish` int(11) DEFAULT NULL,
  `is_top` int(11) DEFAULT NULL,
  `is_delete` int(11) DEFAULT NULL,
  `sell_amount` int(11) DEFAULT '0',
  `free_service_time` int(11) DEFAULT NULL,
  `update_time` timestamp NULL DEFAULT NULL,
  `other_1` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `other_2` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `other_3` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `other_4` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `other_5` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `is_audit` tinyint(1) DEFAULT '0',
  `audit_time` timestamp NULL DEFAULT NULL,
  `is_undercarriage` tinyint(1) DEFAULT '0',
  `undercarriage_time` timestamp NULL DEFAULT NULL,
  `category` varchar(30) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
  `active_tag_dict_id` bigint(20) DEFAULT NULL,
  `active_price` double(11,1) DEFAULT NULL,
  `weight` int(11) unsigned DEFAULT '0',
  `fit_people` varchar(300) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `matter_attent` varchar(800) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
  `category_lv2_id` int(11) DEFAULT NULL,
  `artisan_visit` int(1) DEFAULT '1',
  `customer_visit` int(1) DEFAULT '0',
  `customer_zhima_price` double(11,2) DEFAULT NULL,
  `customer_market_price` double(11,2) DEFAULT NULL,
  `service_sex` int(1) DEFAULT '0',
  `service_mode` tinyint(2) DEFAULT '0' ,
  `last_update_time` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `sell_price` double(11,2) NOT NULL DEFAULT '0.00',
  `is_new` int(1) NOT NULL,
  `spu_id` int(11) DEFAULT NULL,
  `category_id` int(11) DEFAULT NULL,
  `other_info` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL DEFAULT '',
  `product_type` int(2) NOT NULL DEFAULT '0' ,
  `product_code` varchar(15) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2、在name字段创建fulltext索引
 
mysql> alter table product_test02 add FULLTEXT index ft_indx_name (name) WITH PARSER ngram;
Query OK, 0 rows affected, 1 warning (3 min 45.93 sec)
3、利用fulltext index进行检索
 
mysql> select name from product_test02 where match(name) against ('头部' in boolean mode) limit 1;
+———————+
| name                |
+———————+
| 头部按*摩+拨筋       |
+———————+
1 row in set (0.00 sec)
mysql> select name from product_test02 where match(name) against ('头' in boolean mode) limit 1;
Empty set (0.00 sec)
经查询：这个是数据库ft_min_word_len参数有关，默认为4，至少检索4个字符，被检索字符串长度小于4个字符将检索不到。
 
4、改参数ft_min_word_len = 1并重启实例
 
mysql> show variables like 'ft%';
+————————–+—————-+
| Variable_name            | Value          |
+————————–+—————-+
| ft_boolean_syntax        | + -><()~*:""&| |
| ft_max_word_len          | 84             |
| ft_min_word_len          | 1              |
| ft_query_expansion_limit | 20             |
| ft_stopword_file         | (built-in)     |
+————————–+—————-+
5、再次查询
 
mysql> select name from product_test02 where match(name) against ('头' in boolean mode) limit 1;
Empty set (0.01 sec)
依然查询不到，原因是ft_min_word_len 参数改完之后，必须重建所有fulltext index
 
6、重建fulltext index并检索
 
mysql> select name from product_test02 where match(name) against ('头部' in boolean mode) limit 1;
Empty set (0.00 sec)
mysql> select name from product_test02 where match(name) against ('3' in boolean mode) limit 1;
Empty set (0.00 sec)
经查询，ngram_token_size=2 #用中文检索分词插件ngram之前，先得在MySQL配置文件里面设置他的分词大小
 
7、更改参数ngram_token_size=1，并重启实例
 
mysql> show variables like 'ng%';
+——————+——-+
| Variable_name    | Value |
+——————+——-+
| ngram_token_size | 1     |
+——————+——-+
1 row in set (0.01 sec)
mysql> select name from product_test02 where match(name) against ('头部' in boolean mode) limit 1;
+———————————————+
| name                                        |
+———————————————+
| 【头疼必拍】头部舒压+经络疏通               |
+———————————————+
1 row in set (0.01 sec)
mysql> select name from product_test02 where match(name) against ('头' in boolean mode) limit 1;
+————————————————–+
| name                                             |
+————————————————–+
| 头部拨筋头晕头痛失眠【头部调理】                 |
+————————————————–+
1 row in set (0.01 sec)
可以正常检索。
 
“MySQL fulltext index检索中文有哪些注意事项”的内容就介绍到这里了，感谢大家的阅读。