用mysql触发器自动更新memcache的实现代码

不错的一篇文章，用于项目中可以带来更多的便利，按照方法已经调试成功，可以大大提高项目的速度。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。安装步骤安装memcached,这个步骤很简单，随处可见安装mysql server 5.1RC，安装办法也很大众，不废话了编译libmemcached，解压后安装即可./configure; make; make install编译Memcached Functions for MySQL，在http://download.tangent.org/找一个最新的版本下载就是，./configure --with-mysql=/usr/local/mysql/bin/mysql_config --libdir=/usr/local/mysql/lib/mysql/makemake install接下来有两个办法让Memcached Functions for MySQL在mysql中生效在mysql的shell中执行memcached_functions_mysql源码目录下的sql/install_functions.sql，这会把memcache function作为UDF加入mysql运行memcached_functions_mysql源码目录下的utils/install.pl，这是一个perl脚本，作用同上一条测试memcache function以下测试脚本摘自memcached_functions_mysql的源码目录，有兴趣可以试试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);DELIMITERDROP TRIGGER IF EXISTS url_mem_insert;CREATE TRIGGER url_mem_insertBEFORE INSERT ON urlsFOR EACH ROW BEGINSET NEW.id= memc_increment('urls:sequence');SET @mm= memc_set(concat('urls:',NEW.id), NEW.url);ENDDELIMITER ;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');