mysql 5.1支持触发器以及自定义函数接口(UDF)的特性，如果配合libmemcache以及Memcached Functions for MySQL，就能够实现memcache的自动更新。简单记录一下安装测试步骤。
drop table if exists urls;
create table urls (
id int(3) not null,
url varchar(64) not null default ‘‘,
primary key (id)
);
select memc_servers_set(‘localhost:11211‘);
select memc_set(‘urls:sequence‘, 0);
DELIMITER
DROP TRIGGER IF EXISTS url_mem_insert;
CREATE TRIGGER url_mem_insert
BEFORE INSERT ON urls
FOR EACH ROW BEGIN
SET NEW.id= memc_increment(‘urls:sequence‘);
SET @mm= memc_set(concat(‘urls:‘,NEW.id), NEW.url);
END
DELIMITER ;
insert into urls (url) values (‘http://google.com‘);
insert into urls (url) values (‘http://www.ooso.net/index.php‘);
insert into urls (url) values (‘http://www.ooso.net/‘);
insert into urls (url) values (‘http://slashdot.org‘);
insert into urls (url) values (‘http://mysql.com‘);
select * from urls;
select memc_get(‘urls:1‘);
select memc_get(‘urls:2‘);
select memc_get(‘urls:3‘);
select memc_get(‘urls:4‘);
select memc_get(‘urls:5‘);
