How to use MySQL triggers to automatically update memcache

Editor to share with you how to use MySQL triggers to update memcache automatically. I hope you will get something after reading this article. Let's discuss it together.

Mysql 5.1supports the features of trigger and custom function interface (UDF). If you cooperate with libmemcache and Memcached Functions for MySQL, you can automatically update memcache. Briefly record the installation test steps.

Installation steps

To install memcached, this step is simple and can be seen everywhere.

Install mysql server 5.1RC, the installation method is also very popular, cut the crap

Compile libmemcached, decompress it and install it. / configure; make; make install

Compiling Memcached Functions for MySQL, looking for the latest version is. / configure-- with-mysql=/usr/local/mysql/bin/mysql_config-- libdir=/usr/local/mysql/lib/mysql/

Make

Make install

Next, there are two ways to make Memcached Functions for MySQL effective in mysql

Execute sql/install_functions.sql under the memcached_functions_mysql directory in the shell of mysql, which will add memcache function to mysql as UDF

Run utils/install.pl under the memcached_functions_mysql source directory, which is a perl script that works the same as the previous line

Test memcache function

The following test script is extracted from the source directory of memcached_functions_mysql. If you are interested, you can try it.

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 (http://google.com);

Insert into urls (url) values (http://www.ooso.net/index.);

Insert into urls (url) values (http://www.devdao.net/);

Insert into urls (url) values (http://slashdot.org);

Insert into urls (url) values (http://.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)

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