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MySQL のFederated Table としてOpen Exchange Rates Data データを連携利用する

SQL Gateway とODBC Driver を使ってOpen Exchange Rates のMySQL Federated Table を構築する。

SQL Gateway を使って、MySQL リモーティングサービスを作成し、Open Exchange Rates のMySQL Federated Table を構築できます。CData ODBC Driver for Open Exchange Rates のMySQL インターフェースのdeamon になります。サービス起動後、MySQL のFEDERATED ストレージエンジンを使ってサーバーおよびテーブルを作成します。Open Exchange Rates data をMySQL テーブルのように使いましょう。

Open Exchange Rates Data への接続

If you have not already done so, provide values for the required connection properties in the data source name (DSN). You can use the built-in Microsoft ODBC Data Source Administrator to configure the DSN. This is also the last step of the driver installation. See the "Getting Started" chapter in the help documentation for a guide to using the Microsoft ODBC Data Source Administrator to create and configure a DSN.

The Open Exchange Rates API supports basic authentication with an App Id. After you register, your App Id is displayed in your account dashboard. Set this to the AppId connection property.

SQL Gateway の設定

See the SQL Gateway Overview to set up connectivity to Open Exchange Rates data as a virtual MySQL database. You will configure a MySQL remoting service that listens for MySQL requests from clients. The service can be configured in the SQL Gateway UI.

Open Exchange Rates Data のFEDERATED サーバーおよびテーブルを作成

After you have configured and started the service, create a FEDERATED server to simplify the process of creating FEDERATED tables:

FEDERATED サーバーの作成

The following statement will create a FEDERATED server based on the ODBC Driver for Open Exchange Rates. Note that the username and password of the FEDERATED server must match a user account you defined on the Users tab of the SQL Gateway.

CREATE SERVER fedOpenExchangeRates
FOREIGN DATA WRAPPER mysql
OPTIONS (USER 'sql_gateway_user', PASSWORD 'sql_gateway_passwd', HOST 'sql_gateway_host', PORT ####, DATABASE 'CData OpenExchangeRates Sys');

FEDERATED テーブルの作成

To create a FEDERATED table using our newly created server, use the CONNECTION keyword and pass the name of the FEDERATED server and the remote table (Projects). Refer to the following template for the statement to create a FEDERATED table:

CREATE TABLE fed_projects (
  ...,
  id  TYPE(LEN),
  statistics_viewcount  TYPE(LEN),
  ...,
)
ENGINE=FEDERATED
DEFAULT CHARSET=latin1
CONNECTION='fedOpenExchangeRates/projects';

NOTE: The table schema for the FEDERATED table must match the remote table schema exactly. You can always connect directly to the MySQL remoting service using any MySQL client and run a SHOW CREATE TABLE query to get the table schema.

クエリの実行

You can now execute queries to the Open Exchange Rates FEDERATED tables from any tool that can connect to MySQL, which is particularly useful if you need to JOIN data from a local table with data from Open Exchange Rates. Refer to the following example:

SELECT 
  fed_projects.id, 
  local_table.custom_field 
FROM 
  local_table 
JOIN 
  fed_projects 
ON 
  local_table.foreign_id = fed_projects.id;
 
 
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