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用mysql触发器自动更新memcache的实现代码

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/
    make
    make install


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);
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);