MySQL fulltext index检索中文有哪些注意事项
发布时间：2021-12-23 10:57:40 所属栏目：MySql教程 来源：互联网
导读：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
|
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。 （编辑：温州站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
