Mysql与Redis的同步实践

一、测试环境在Ubuntu kylin 14.04 64bit

已经安装Mysql、Redis、php、lib_mysqludf_json.so、Gearman。 
点击这里查看测试数据库及表参考 
本文也有些基本操作，在之前文章里有介绍。

1、安装

mysql-udf">安装gearman-mysql-udf

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apt-get install libgearman-dev wget https://launchpad.net/gearman-mysql-udf/trunk/0.6/+download/gearman-mysql-udf-0.6.tar.gz tar -xzf gearman-mysql-udf-0.6.tar.gz cd gearman-mysql-udf-0.6 ./configure --with-mysql=/usr/bin/mysql_config --libdir=/usr/lib/mysql/plugin/ make sudo make install

注册UDF函数：

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CREATE FUNCTION gman_do_background RETURNS STRING SONAME 'libgearman_mysql_udf.so'; CREATE FUNCTION gman_servers_set RETURNS STRING SONAME 'libgearman_mysql_udf.so'; CREATE FUNCTION gman_do RETURNS STRING SONAME "libgearman_mysql_udf.so"; CREATE FUNCTION gman_do_high RETURNS STRING SONAME "libgearman_mysql_udf.so"; CREATE FUNCTION gman_do_low RETURNS STRING SONAME "libgearman_mysql_udf.so"; CREATE FUNCTION gman_do_background RETURNS STRING SONAME "libgearman_mysql_udf.so"; CREATE FUNCTION gman_do_high_background RETURNS STRING SONAME "libgearman_mysql_udf.so"; CREATE FUNCTION gman_do_low_background RETURNS STRING SONAME "libgearman_mysql_udf.so"; CREATE AGGREGATE FUNCTION gman_sum RETURNS INTEGER SONAME "libgearman_mysql_udf.so"; CREATE FUNCTION gman_servers_set RETURNS STRING SONAME "libgearman_mysql_udf.so";

指定Gearman服务器的信息：

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1	SELECT gman_servers_set('127.0.0.1:4730');

使用示例：

参照http://blog.csdn.net/xundh/article/details/46287681 建立一个reverse.php的worker

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<?php $worker= new GearmanWorker(); $worker->addServer(); $worker->addFunction("reverse", "my_reverse_function"); while ($worker->work());   function my_reverse_function($job){   return strrev($job->workload()); } ?>

输入命令php reverse.php运行。

到mysql里，输入：

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1	SELECT gman_do("reverse",'abcdef') AS test FROM Users; ---FROM Users也可以不带。

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1	SELECT gman_do("reverse", password) AS test FROM Users;

可以看到输出结果，其中password列已经被reverse的worker处理，mysql这时充当client端：

还可以输入以下命令测试：

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1	SELECT gman_do_high("reverse", password) AS test FROM Users; --高优先权

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1	SELECT gman_do_background("reverse", password) AS test FROM Users; --后台低优先权，返回主机和作业号。

创建syncToRedis作业

停止前面的reverse worker，建立一个syncToRedis.php

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<?php $worker = new GearmanWorker(); $worker->addServer(); $worker->addFunction('syncToRedis', 'syncToRedis');   $redis = new Redis(); $redis->connect('127.0.0.1', 6379); echo("begin:\n");   while($worker->work()); function syncToRedis($job) {         global $redis;         $workString = $job->workload();         $work = json_decode($workString);     echo('get value:');     echo($workString);     echo("\n");     echo('json_decode:');     var_dump($work);     echo("\n");         if(!isset($work->user_id)){                 return false;         }         $redis->set($work->user_id, $workString); }

在mysql里测试一下：

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1	SELECT gman_do("syncToRedis", json_object(user_id as user_id,password as password)) AS test FROM Users;

如果redis监控是打开的，可以看到redis已经收到了数据： 

redis查询结果 

2、建立触发器

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DELIMITER $$     CREATE TRIGGER datatoredis AFTER UPDATE ON Users       FOR EACH ROW BEGIN         SET @ret=gman_do_background('syncToRedis', json_object(NEW.user_id as `user_id`, NEW.email as `email`,NEW.display_name as `display_name`,NEW.password as `password`));        END$$ DELIMITER ;

执行SQL语句测试：

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1 2	insert into Users values('8','new','3','hello'); update Users set email='new8@qq.com' where user_id=8;

正常使用时，可以把worker使用&设置为后台任务： 
nohup php syncToReids.php &