I'm trying to create a page that tracks some basic user statistics in a database. I'm starting small, by trying to keep track of how many people come using what User Agent, but I've come across a stumbling block. How can I check the User Agent being added to the table to see if it is already there or not?
2条回答 默认 最新
- doufeinai6081 2010-08-14 05:45关注
You can make the column that stores the User Agent string
unique
, and do INSERT ... ON DUPLICATE KEY UPDATE for your stats insertionsFor the table:
CREATE TABLE IF NOT EXISTS `user_agent_stats` ( `user_agent` varchar(255) collate utf8_bin NOT NULL, `hits` int(21) NOT NULL default '1', UNIQUE KEY `user_agent` (`user_agent`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin; +------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------+--------------+------+-----+---------+-------+ | user_agent | varchar(255) | NO | PRI | NULL | | | hits | int(21) | NO | | NULL | | +------------+--------------+------+-----+---------+-------+
You could use the following query to insert user agents:
INSERT INTO user_agent_stats( user_agent ) VALUES('user agent string') ON DUPLICATE KEY UPDATE hits = hits+1;
Executing the above query multiple times gives:
+-------------------+------+ | user_agent | hits | +-------------------+------+ | user agent string | 6 | +-------------------+------+
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