MySQL的源码安装及使用UDFs进行数据自动更新的教程

mysql的源码安装
1. 安装依赖组件

# yum install gcc gcc-c++ ncurses-devel perl -y

2. 安装cmake

# wget http://www.cmake.org/files/v2.8/cmake-2.8.12.tar.gz
# tar zxvf cmake-2.8.12.tar.gz
# cd cmake-2.8.12
# ./bootstrap 
# make && make install

3. 安装bison

# wget http://ftp.gnu.org/gnu/bison/bison-3.0.2.tar.gz
# tar zxvf bison-3.0.2.tar.gz
# cd bison-3.0.2
# ./configure
# make && make install

4. 创建用户的相应目录

# groupadd mysql
# useradd -g mysql mysql
# mkdir -p /data/mysql/
# mkdir -p /data/mysql/data/
# mkdir -p /data/mysql/log/

5. 获取mysql安装包并安装

# wget http://downloads.mysql.com/archives/mysql-5.5/mysql-5.5.24.tar.gz
# tar zxvf mysql-5.5.24.tar.gz
# cd mysql-5.5.24
# cmake \
-dcmake_install_prefix=/data/mysql \
-dmysql_unix_addr=/data/mysql/mysql.sock \
-ddefault_charset=utf8 \
-ddefault_collation=utf8_general_ci \
-dwith_innobase_storage_engine=1 \
-dwith_archive_storage_engine=1 \
-dwith_blackhole_storage_engine=1 \
-dmysql_datadir=/data/mysql/data \
-dmysql_tcp_port=3306 \
-denable_downloads=1
# make && make install

6. 修改目录权限

# chmod +w /data/mysql/
# chown -r mysql:mysql /data/mysql/

# ln -s /data/mysql/lib/libmysqlclient.so.18 /usr/lib/libmysqlclient.so.18
# ln -s /data/mysql/mysql.sock /tmp/mysql.sock

7. 初始化数据库

# cp -rp /data/mysql/support-files/my-medium.cnf /etc/my.cnf
# cp -rp /data/mysql/support-files/mysql.server /etc/rc.d/init.d/mysqld
# /data/mysql/scripts/mysql_install_db --user=mysql --defaults-file=/etc/my.cnf --basedir=/data/mysql --datadir=/data/mysql/data

8. 启动mysql服务

# chmod +x /etc/init.d/mysqld
# vi /etc/init.d/mysqld -->
basedir=/data/mysql
datadir=/data/mysql/data
# chkconfig --add mysqld
# service mysqld start

9. 完成配置

# /data/mysql/bin/mysqladmin -uroot -p password 'passwd'
# echo "export path=/data/mysql/bin:$path" >> ~/.bash_profile 
# source ~/.bash_profile

udfs实现memcached与mysql的自动更新

udfs是user defined functions的缩写，表示mysql的用户定义函数，应用程序可以利用这些函数从mysql5.0以上版本的数据库中访问memcached写入或者获取的数据。此外，mysql从5.1版本开始支持触发器，从而可以在触发器中使用udfs直接更新memcached的内容，这种方式降低了应用程序设计和编写的复杂性。
1.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 < /sql/install_functions.sql
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。

2.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');