Mysql Federated Server 示例

   Federated存储引擎访问在远程数据库的表中的数据，而不是本地的表。创建一个Federated表的时候，服务器在数据库目录创建一个表定义文件。无其它表被创建，因为实际的数据在一个远程数据库上。这不同于为本地表工作的存储引擎的方式。

1. 检查当前服务器配置是否支持Federated存储引擎：

Show Engines;

查询结果，如果Federated行对应的Support列值为YES，说明当前服务器支持Federated存储引擎。

如果Federated行对应的Support列值为NO,需要我们进行配置。找到服务器安装目录下my.ini文件；记事本打开文件添加Federated；保存；重启MySQL服务器。

2. 在远程服务器上，创建本地表；并导入数据。

CREATE TABLE IF NOT EXISTS `departmentweekdata` (
  `department` varchar(255) NOT NULL,
  `week` varchar(10) NOT NULL,
  `interval` tinyint(4) DEFAULT NULL,
  `number` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- 插入表数据
--

INSERT INTO `departmentweekdata` (`department`, `week`, `interval`, `number`) VALUES
('CAO', '2014-12', 1, 1),
('GBG1', '2014-12', 1, 0),
('CAO', '2014-12', 2, 0),
('GBG1', '2014-12', 2, 0),
('CAO', '2014-12', 3, 1),
('GBG1', '2014-12', 3, 0),
('CAO', '2014-11', 1, 2),
('GBG1', '2014-11', 1, 0),
('CAO', '2014-11', 2, 0),
('GBG1', '2014-11', 2, 0),
('CAO', '2014-11', 3, 1),
('GBG1', '2014-11', 3, 0),
('CAO', '2014-10', 1, 1),
('GBG1', '2014-10', 1, 0),
('CAO', '2014-10', 2, 2),
('GBG1', '2014-10', 2, 0),
('CAO', '2014-10', 3, 0),
('GBG1', '2014-10', 3, 0),
('CAO', '2014-09', 1, 1),
('GBG1', '2014-09', 1, 0),
('CAO', '2014-09', 2, 0),
('GBG1', '2014-09', 2, 0),
('CAO', '2014-09', 3, 0),
('GBG1', '2014-09', 3, 0),
('CAO', '2014-08', 1, 2),
('GBG1', '2014-08', 1, 0),
('CAO', '2014-08', 2, 0),
('GBG1', '2014-08', 2, 0),
('CAO', '2014-08', 3, 1),
('GBG1', '2014-08', 3, 0),
('CAO', '2014-07', 1, 1),
('GBG1', '2014-07', 1, 0),
('CAO', '2014-07', 2, 2),
('GBG1', '2014-07', 2, 0),
('CAO', '2014-07', 3, 0),
('GBG1', '2014-07', 3, 0),
('CAO', '2014-06', 1, 0),
('GBG1', '2014-06', 1, 0),
('CAO', '2014-06', 2, 1),
('GBG1', '2014-06', 2, 0),
('CAO', '2014-06', 3, 0),
('GBG1', '2014-06', 3, 0),
('CAO', '2014-05', 1, 0),
('GBG1', '2014-05', 1, 0),
('CAO', '2014-05', 2, 1),
('GBG1', '2014-05', 2, 0),
('CAO', '2014-05', 3, 0),
('GBG1', '2014-05', 3, 0),
('CAO', '2014-04', 1, 1),
('GBG1', '2014-04', 1, 0),
('CAO', '2014-04', 2, 0),
('GBG1', '2014-04', 2, 0),
('CAO', '2014-04', 3, 0),
('GBG1', '2014-04', 3, 0),
('CAO', '2014-03', 1, 0),
('GBG1', '2014-03', 1, 0),
('CAO', '2014-03', 2, 0),
('GBG1', '2014-03', 2, 0),
('CAO', '2014-03', 3, 1),
('GBG1', '2014-03', 3, 0);

3. 在本地服务器上创建Federated表。

CREATE TABLE `DepartmentWeekData` (
     `department` VARCHAR(255) NOT NULL,
     `week` VARCHAR(10) NOT NULL,
     `interval` TINYINT(4) NULL,
     `number` INT NULL
) ENGINE=FEDERATED   
CONNECTION='mysql://USER:PASSWORD@HOST:PORT/DATABASE/TABLE';

其中连接字符串示例：CONNECTION='mysql://root:123@127.0.0.1:3306/dbTest/TestTable';

4. 如果使用MySQL客户端工具，可以创建Federated Server:

CREATE SERVER `FServer`
FOREIGN DATA WRAPPER mysql
OPTIONS (
  HOST '127.0.0.1',
  PORT 3306,
  USER 'root',
  PASSWORD '123',
  DATABASE 'DBTest'
);

5. 如果创建了Federated Server，创建Federated表可以用下面的方式：

CREATE TABLE `DepartmentWeekData` (
     `department` VARCHAR(255) NOT NULL,
     `week` VARCHAR(10) NOT NULL,
     `interval` TINYINT(4) NULL,
     `number` INT NULL
) ENGINE=FEDERATED   
CONNECTION='FServer/TABLE';

6.创建好Federated表以后，就可以访问远程数据库表中的数据了。