Question

我以前使用过Sql Server并使用了它非常好的功能，称为Sql全文搜索。现在我必须使用MySql。谁能告诉我MySql中的全文搜索等价物？我使用的是免费版的MySql而不是商业版。如果没有，那么我们还能做些什么来模仿全文搜索并克服LIKE算子的局限？

提前致谢：）

Answer 1

请参阅mysql中有关全文搜索支持的文档：

http://dev.mysql.com/doc/refman/5.1/en/fulltext-search.html

您需要将全文索引应用于列，以支持对这些列进行全文搜索。请注意，mysql仅支持MyISAM表的全文索引。

作为一个例子，以防上述链接在某些时候失效，请参阅文档中的完整示例：

mysql> CREATE TABLE articles (
    ->   id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY,
    ->   title VARCHAR(200),
    ->   body TEXT,
    ->   FULLTEXT (title,body)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql> INSERT INTO articles (title,body) VALUES
    -> ('MySQL Tutorial','DBMS stands for DataBase ...'),
    -> ('How To Use MySQL Well','After you went through a ...'),
    -> ('Optimizing MySQL','In this tutorial we will show ...'),
    -> ('1001 MySQL Tricks','1. Never run mysqld as root. 2. ...'),
    -> ('MySQL vs. YourSQL','In the following database comparison ...'),
    -> ('MySQL Security','When configured properly, MySQL ...');
Query OK, 6 rows affected (0.00 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> SELECT * FROM articles
    -> WHERE MATCH (title,body)
    -> AGAINST ('database' IN NATURAL LANGUAGE MODE);
+----+-------------------+------------------------------------------+
| id | title             | body                                     |
+----+-------------------+------------------------------------------+
|  5 | MySQL vs. YourSQL | In the following database comparison ... |
|  1 | MySQL Tutorial    | DBMS stands for DataBase ...             |
+----+-------------------+------------------------------------------+

参考http://dev.mysql.com/doc/refman/5.1/en/fulltext-natural-language.html

Answer 2

在MyISAM表上，MySQL支持FULLTEXT索引：

CREATE TABLE mytable (id INT, caption TEXT, content TEXT, FULLTEXT KEY fx_mytable_caption_content (caption, content)) ENGINE=MyISAM;

SELECT  *
FROM    mytable
WHERE   MATCH(caption, content) AGAINST ('my search query')

Answer 3

您可以在一列或多列上创建全文索引。然后，您可以使用全文搜索查询来查询表。请参阅MySQL Full-Text index和MySQL Full-text Search functions。

典型的查询如下：

 SELECT * FROM books
 WHERE    MATCH (title, summary) AGAINST ('harry potter')
 ORDER BY MATCH (title, summary) AGAINST ('harry potter')
 LIMIT 0, 10

什么是MySql相当于Sql Server全文搜索？

3 个答案: