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

安装gearman-mysql-udf

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：

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：

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

<?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：

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

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：

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

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

<?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：

    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

    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：

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 &