MySQL全文搜索
2009-01-05 11:15:37 来源:WEB开发网全文索引在 MySQL 中是一个FULLTEXT类型索引。FULLTEXT索引用于MyISAM表,可以在CREATE TABLE时或之后使用ALTER TABLE或CREATE INDEX在CHAR、VARCHAR或TEXT列上创建。对于大的数据库,将数据装载到一个没有FULLTEXT索引的表中,然后再使用ALTER TABLE(或CREATE INDEX) 创建索引,这将是非常快的。将数据装载到一个已经有FULLTEXT索引的表中,将是非常慢的。
全文搜索通过MATCH()函数完成。
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 VALUES
-> (NULL,'MySQL Tutorial', 'DBMS stands for DataBase ...'),
-> (NULL,'How To Use MySQL Efficiently', 'After you went through a ...'),
-> (NULL,'Optimising MySQL','In this tutorial we will show ...'),
-> (NULL,'1001 MySQL Tricks','1. Never run mysqld as root. 2. ...'),
-> (NULL,'MySQL vs. YourSQL', 'In the following database comparison ...'),
-> (NULL,'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');
+----+-------------------+------------------------------------------+
| id | title | body |
+----+-------------------+------------------------------------------+
| 5 | MySQL vs. YourSQL | In the following database comparison ... |
| 1 | MySQL Tutorial | DBMS stands for DataBase ... |
+----+-------------------+------------------------------------------+
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