深度解析MySQL 5.7之中文全文检索

[mysqld]
ngram_token_size=2

CREATE TABLE articles (
   id INTUNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,
   titleVARCHAR(200),
   body TEXT,
   FULLTEXT (title,body) WITH PARSER ngram
  ) ENGINE=InnoDBCHARACTER SET utf8mb4;

mysql> select * from articles\G
***************************1. row ***************************
  id: 1
title: 数据库管理
 body: 在本教程中我将向你展示如何管理数据库
***************************2. row ***************************
  id: 2
title: 数据库应用开发
 body: 学习开发数据库应用程序
***************************3. row ***************************
  id: 3
title: MySQL完全手册
 body: 学习MySQL的一切
***************************4. row ***************************
  id: 4
title: 数据库与事务处理
 body: 系统的学习数据库的事务概论
***************************5. row ***************************
  id: 5
title: NoSQL精髓
 body: 学习了解各种非结构化数据库
***************************6. row ***************************
  id: 6
title: SQL 语言详解
 body: 详细了解如果使用各种SQL
6 rows inset (0.00 sec)

mysql> SETGLOBAL innodb_ft_aux_table="new_feature/articles";
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT *FROM information_schema.INNODB_FT_INDEX_CACHE LIMIT 20,10;
+------+--------------+-------------+-----------+--------+----------+
| WORD | FIRST_DOC_ID | LAST_DOC_ID | DOC_COUNT | DOC_ID| POSITION |
+------+--------------+-------------+-----------+--------+----------+
| 中我 |   2 |   2 |   1 |  2 |  28 |
| 习m |   4 |   4 |   1 |  4 |  21 |
| 习了 |   6 |   6 |   1 |  6 |  16 |
| 习开 |   3 |   3 |   1 |  3 |  25 |
| 习数 |   5 |   5 |   1 |  5 |  37 |
| 了解 |   6 |   7 |   2 |  6 |  19 |
| 了解 |   6 |   7 |   2 |  7 |  23 |
| 事务 |   5 |   5 |   1 |  5 |  12 |
| 事务 |   5 |   5 |   1 |  5 |  40 |
| 何管 |   2 |   2 |   1 |  2 |  52 |
+------+--------------+-------------+-----------+--------+----------+
10 rows in set (0.00 sec)

mysql>SELECT COUNT(*) FROM articles
-> WHERE MATCH (title,body) AGAINST ('数据库' IN NATURALLANGUAGE MODE);
+----------+
| COUNT(*) |
+----------+
|  4 |
+----------+
1 row in set (0.05 sec)

 mysql>SELECT id, MATCH (title,body) AGAINST ('数据库' IN NATURAL LANGUAGE MODE)
 AS score FROM articles;
+----+----------------------+
| id| score    |
+----+----------------------+
| 1 | 0.12403252720832825 |
| 2 | 0.12403252720832825 |
| 3 |     0 |
| 4 | 0.12403252720832825 |
| 5 | 0.062016263604164124|
| 6 |     0 |
+----+----------------------+
6rows in set (0.00 sec)

mysql> SELECT * FROM articles WHERE MATCH (title,body)
  ->  AGAINST ('+数据库 +管理' IN BOOLEAN MODE);
+----+------------+--------------------------------------+
| id| title  | body         |
+----+------------+--------------------------------------+
| 1 | 数据库管理 | 在本教程中我将向你展示如何管理数据库  |
+----+------------+--------------------------------------+
1 rowin set (0.00 sec)

mysql> SELECT * FROM articles WHERE MATCH (title,body)
  ->  AGAINST ('+数据库 -管理' IN BOOLEAN MODE);
+----+------------------+----------------------------+
| id| title    | body      |
+----+------------------+----------------------------+
| 2 | 数据库应用开发  | 学习开发数据库应用程序   |
| 4 | 数据库与事务处理 | 系统的学习数据库的事务概论  |
| 5 | NoSQL 精髓  | 学习了解各种非结构化数据库  |
+----+------------------+----------------------------+
3 rows in set (0.00 sec)

mysql> SELECT * FROM articles WHERE MATCH (title,body)
  ->  AGAINST ('>数据库 +MySQL' INBOOLEAN MODE);
+----+---------------+-----------------+
| id| title   | body   |
+----+---------------+-----------------+
| 3 | MySQL完全手册 |学习MySQL的一切 |
+----+---------------+-----------------+
1 rowin set (0.00 sec)

mysql> SELECT * FROM articles
  ->  WHERE MATCH (title,body)
  ->  AGAINST ('数据库' WITH QUERY EXPANSION);
+----+------------------+--------------------------------------+
| id| title   | body         |
+----+------------------+--------------------------------------+
| 1 | 数据库管理  | 在本教程中我将向你展示如何管理数据库  |
| 4 | 数据库与事务处理 | 系统的学习数据库的事务概论    |
| 2 | 数据库应用开发  | 学习开发数据库应用程序     |
| 5 | NoSQL 精髓  | 学习了解各种非结构化数据库    |
| 6 | SQL 语言详解  | 详细了解如果使用各种SQL     |
| 3 | MySQL完全手册  | 学习MySQL的一切      |
+----+------------------+--------------------------------------+
6 rows in set (0.01 sec)