教你使用MySQL觸發器自動更新memcache

mysql 5.1支持觸發器以及自定義函數接口(UDF)的特性，如果配合libmemcache以及Memcached Functions for MySQL，就能夠實現memcache的自動更新。簡單記錄一下安裝測試步驟。

安裝步驟

安裝memcached,這個步驟很簡單，隨處可見

安裝mysql server 5.1RC，安裝辦法也很大眾，不廢話瞭

編譯libmemcached，解壓後安裝即可./configure; make; make install

編譯Memcached Functions for MySQL，在找一個最新的版本下載就是，./configure –with-mysql=/usr/local/mysql/bin/mysql_config –libdir=/usr/local/mysql/lib/mysql/

make

make install

接下來有兩個辦法讓Memcached Functions for MySQL在mysql中生效

在mysql的shell中執行memcached_functions_mysql源碼目錄下的sql/install_functions.sql，這會把memcache function作為UDF加入mysql

運行memcached_functions_mysql源碼目錄下的utils/install.pl，這是一個perl腳本，作用同上一條

測試memcache function

以下測試腳本摘自memcached_functions_mysql的源碼目錄，有興趣可以試試

PLAIN TEXTCODE: 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 (https://google.com);

insert into urls (url) values (https://www.ooso.net/index.php);

insert into urls (url) values (https://www.devdao.net/);

insert into urls (url) values (https://slashdot.org);

insert into urls (url) values (https://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);