用mysql触发器自动更新memcache

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

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

  <code><span>./</span><span>configure</span><span>;</span><span> make</span><span>;</span><span> make install</span></code>

• 编译Memcached Functions for MySQL，在http://download.tangent.org/找一个最新的版本下载就是，

  <code><span>.</span><span>/configure --with-mysql=/</span><span>usr</span><span>/</span><span>local</span><span>/</span><span>mysql</span><span>/</span><span>bin</span><span>/</span><span>mysql_config </span><span>--</span><span>libdir</span><span>=</span><span>/usr/</span><span>local</span><span>/</span><span>mysql</span><span>/</span><span>lib</span><span>/</span><span>mysql</span><span>/</span><span>
  make
  make install</span></code>

• 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

<code><span>drop table </span><span>if</span><span> exists urls</span><span>;</span><span>
create table urls </span><span>(</span><span>
  id </span><span>int</span><span>(</span><span>3</span><span>)</span><span>not</span><span>null</span><span>,</span><span>
  url varchar</span><span>(</span><span>64</span><span>)</span><span>not</span><span>null</span><span>default</span><span>''</span><span>,</span><span>
  primary key </span><span>(</span><span>id</span><span>)</span><span>);</span><span>select</span><span> memc_servers_set</span><span>(</span><span>'localhost:11211'</span><span>);</span><span>select</span><span> memc_set</span><span>(</span><span>'urls:sequence'</span><span>,</span><span>0</span><span>);</span><span>

DELIMITER </span><span>|</span><span>

DROP TRIGGER IF EXISTS url_mem_insert</span><span>;</span><span>
CREATE TRIGGER url_mem_insert
BEFORE INSERT ON urls
FOR EACH ROW </span><span>BEGIN</span><span>
    SET NEW</span><span>.</span><span>id</span><span>=</span><span> memc_increment</span><span>(</span><span>'urls:sequence'</span><span>);</span><span>
    SET </span><span>@mm</span><span>=</span><span> memc_set</span><span>(</span><span>concat</span><span>(</span><span>'urls:'</span><span>,</span><span>NEW</span><span>.</span><span>id</span><span>),</span><span> NEW</span><span>.</span><span>url</span><span>);</span><span>END</span><span>|</span><span>

DELIMITER </span><span>;</span><span>

insert </span><span>into</span><span> urls </span><span>(</span><span>url</span><span>)</span><span> values </span><span>(</span><span>'http://google.com'</span><span>);</span><span>
insert </span><span>into</span><span> urls </span><span>(</span><span>url</span><span>)</span><span> values </span><span>(</span><span>'http://www.ooso.net/index.php'</span><span>);</span><span>
insert </span><span>into</span><span> urls </span><span>(</span><span>url</span><span>)</span><span> values </span><span>(</span><span>'http://www.ooso.net/'</span><span>);</span><span>
insert </span><span>into</span><span> urls </span><span>(</span><span>url</span><span>)</span><span> values </span><span>(</span><span>'http://slashdot.org'</span><span>);</span><span>
insert </span><span>into</span><span> urls </span><span>(</span><span>url</span><span>)</span><span> values </span><span>(</span><span>'http://mysql.com'</span><span>);</span><span>select</span><span>*</span><span>from</span><span> urls</span><span>;</span><span>select</span><span> memc_get</span><span>(</span><span>'urls:1'</span><span>);</span><span>select</span><span> memc_get</span><span>(</span><span>'urls:2'</span><span>);</span><span>select</span><span> memc_get</span><span>(</span><span>'urls:3'</span><span>);</span><span>select</span><span> memc_get</span><span>(</span><span>'urls:4'</span><span>);</span><span>select</span><span> memc_get</span><span>(</span><span>'urls:5'</span><span>);</span></code>

作者: Volcano 发表于July 9, 2008 at 2:41 pm

版权信息: 和作者信息及此声明

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