memcached 与 mysql_UDFs实现Memcached与Mysql的自动更新
一.安装
wget https://launchpad.net/libmemcached/1.0/0.34/+download/libmemcached-0.34.tar.gz
yum install gcc44 gcc44-c++ libstdc++44-devel
export CC=/usr/bin/gcc44
export CXX=/usr/bin/g++44
./configure --prefix=/soft/libmemcached -disable-64bit CFLAGS="-O3 -march=i686" \
--with-memcached=/root/libmemcached-1.0.7/memcached
make && make install
wget https://launchpad.net/memcached-udfs/trunk/1.1/+download/memcached_functions_mysql-1.1.tar.gz
./configure --prefix=/soft/UDFS/memcache_mysql \
--with-mysql=/soft/mysql/bin/mysql_config \
--libdir=/soft/mysql/lib/plugin \
--with-libmemcached=/soft/UDFS/libmemcached
make && make install
mysql -uroot -pmysql
mysql -uroot -pmysql -se "select name,dl from mysql.func"
select memc_servers_set('127.0.0.1:11211');//如果mysql restart，需要重新运行这句以建立与memcached之间的关系
select memc_server_count();
select memc_set('urls:sequence', 0);
select memc_list_behaviors()\G//修改memcached参数的行为
select memc_servers_behavior_set('MEMCACHED_BEHAVIOR_NO_BLOCK','1');
select
memc_servers_behavior_set('MEMCACHED_BEHAVIOR_TCP_NODELAY','1');
//设置MEMCACHED_BEHAVIOR_NO_BLOCK为打开状态，这样在memcached出现问题时(不能连接时)数据继续插入到
mysql中，报错提示，如果不设置此值，如果memcached失败，mysql需要等到timeout才可以插入到表中。
二.测试：
drop table if exists urls;
create table urls (
id int(3) not null auto_increment,
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(NEW.id, NEW.url);
END |
DROP TRIGGER IF EXISTS url_mem_update |
CREATE TRIGGER url_mem_update
BEFORE UPDATE ON urls
FOR EACH ROW BEGIN
SET @mm= memc_replace(OLD.id, NEW.url);
END |
DROP TRIGGER IF EXISTS url_mem_delete |
CREATE TRIGGER url_mem_delete
BEFORE DELETE ON urls
FOR EACH ROW BEGIN
SET @mm= memc_delete(OLD.id);
END |
DELIMITER ;
insert into urls (url) value ('http://google.com');
insert into urls (url) value ('http://lycos.com/');
insert into urls (url) value ('http://tripod.com/');
insert into urls (url) value ('http://microsoft.com/');
insert into urls (url) value('http://slashdot.org');
insert into urls (url) value ('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');
select memc_get('urls:6');
update urls set url= 'http://mysql.com/sun' where url = 'http://mysql.com';
select url from urls where url = 'http://mysql.com/sun';
select memc_get('urls:6');
delete from urls where url = 'http://microsoft.com/';
select * from urls where url='http://microsoft.com/';
select memc_get('urls:4');