用mysql触发器自动更新memcache的实现代码

2015-01-24信息快讯网

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
    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);
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');
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