MySQL_Style - INSERT ... ON DUPLICATE KEY UPDATE

 

MySQL Performance Blog

Par example, on vais creater une table pour noter le traffic de l'Internet, il y a une table avec le traffic et le numero de package de le port et l'IP de address.

la table comme:

Create Table: CREATE TABLE `ipstat` (
`ip` int(10) unsigned NOT NULL,
`hits` int(10) unsigned NOT NULL,
`last_hit` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (`ip`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1

INSERT INTO ipstat VALUES (inet_aton ( '192.168.0.1' ), 1,now ( ) ) ON duplicate KEY UPDATE hits=hits+ 1;

+------------+------+---------------------+
| ip | hits | last_hit |
+------------+------+---------------------+
| 3232235521 | 1 | 2009-02-27 10:56:49 |
+------------+------+---------------------+

inet_aton
pour convertir l'IP de 15 bytes a 4 bytes. Tu peux changer le format de la table ipstat

mysql> alter table ipstat modify ip int(15);

mysql> select * from ipstat;
+-------------+------+---------------------+
| ip | hits | last_hit |
+-------------+------+---------------------+
| 2147483647 | 2 | 2009-02-27 10:57:15 |
| 192168 | 2 | 2009-02-27 11:31:13 |
| 192.168.0.1 | 2 | 2009-02-27 11:32:03 |
+-------------+------+---------------------+