Redis 學習筆記四 Mysql 與Redis的同步實踐

1、測試環境在Ubuntu kylin 14.04 64bit

已經安裝Mysql、Redis、php、lib_mysqludf_json.so、Gearman。 
點擊這裏查看測試數據庫及表參考 
本文也有些基本操做,在以前文章裏有介紹。

1、安裝

安裝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
註冊UDF函數:

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服務器的信息:

SELECT gman_servers_set('127.0.0.1:4730');
使用示例:

參照http://blog.csdn.net/xundh/article/details/46287681 創建一個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());
}
?>
輸入命令php reverse.php運行。

到mysql裏,輸入:

SELECT gman_do("reverse",'abcdef') AS test FROM Users; ---FROM Users也能夠不帶。
這裏寫圖片描述

SELECT gman_do("reverse", password) AS test FROM Users;
能夠看到輸出結果,其中password列已經被reverse的worker處理,mysql這時充當client端:

這裏寫圖片描述

還能夠輸入如下命令測試:

SELECT gman_do_high("reverse", password) AS test FROM Users; --高優先權
這裏寫圖片描述

SELECT gman_do_background("reverse", password) AS test FROM Users; --後臺低優先權,返回主機和做業號。
這裏寫圖片描述

建立syncToRedis做業

中止前面的reverse worker,創建一個syncToRedis.php

    <?php
    ini_set('default_socket_timeout', -1); //很重要,不然可能報RedisException with message read error on connection ...
    $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);
    }
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在mysql裏測試一下:

    SELECT gman_do("syncToRedis", json_object(user_id as user_id,password as password)) AS test FROM Users;
這裏寫圖片描述

若是redis監控是打開的,能夠看到redis已經收到了數據: 
這裏寫圖片描述

redis查詢結果 
這裏寫圖片描述

2、創建觸發器

    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 ;
執行SQL語句測試:

insert into Users values('8','new','3','hello');
update Users set email='new8@qq.com' where user_id=8;
這裏寫圖片描述

正常使用時,能夠把worker使用&設置爲後臺任務: 
nohup php syncToReids.php &

其它問題

有的時候,命令行執行php語句時可能會提示下面的錯誤,

[root@iZ230296jm2Z redis]# php syncToRedis.php PHP Fatal error: Class ‘Redis’ not found in /home/wwwroot/default/youai/php/redis/syncToRedis.php on line 6 
處理方法: 
運行php命令和apache或ngnix可能使用了不一樣的php.ini,即便在php.ini裏看到加載了redis,還須要在php命令行使用php.ini裏也增長Redis模塊。 
查看ngnix使用的php.ini位置使用
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