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;
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create table urls (
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id int(3) not null,
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url varchar(64) not null default '',
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primary key (id)
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);
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select memc_servers_set('localhost:11211');
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select memc_set('urls:sequence', 0);
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DELIMITER |
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DROP TRIGGER IF EXISTS url_mem_insert;
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CREATE TRIGGER url_mem_insert
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BEFORE INSERT ON urls
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FOR EACH ROW BEGIN
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SET NEW.id= memc_increment('urls:sequence');
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SET @mm= memc_set(concat('urls:',NEW.id), NEW.url);
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END |
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DELIMITER ;
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insert into urls (url) values ('http://google.com');
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insert into urls (url) values ('http://www.ooso.net/index.php');
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insert into urls (url) values ('http://www.ooso.net/');
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insert into urls (url) values ('http://slashdot.org');
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insert into urls (url) values ('http://mysql.com');
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select * from urls;
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select memc_get('urls:1');
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select memc_get('urls:2');
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select memc_get('urls:3');
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select memc_get('urls:4');
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select memc_get('urls:5');
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