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Connect to RSS Feeds as a Federated Tables in MySQL

Use the CData Cloud Hub to set up federated tables for RSS feeds in MySQL .

You can use the CData Cloud Hub to set up federated tables in MySQL for RSS feeds. The Cloud Hub provides a MySQL interface for RSS: After configuring a virtual MySQL database for RSS, you can create a server and tables using the FEDERATED Storage Engine in MySQL. You can then work with RSS feeds just as you would local MySQL tables.

The CData Cloud Hub provides a pure MySQL, cloud-to-cloud interface for RSS, allowing you to easily query live RSS feeds alongside existing MySQL data — all without replicating the data. Using optimized data processing out of the box, the CData Cloud Hub pushes all supported SQL operations (filters, JOINs, etc) directly to RSS, leveraging server-side processing to quickly return RSS feeds.

Create a Virtual MySQL Database for RSS Feeds

CData Cloud Hub uses a straightforward, point-and-click interface to connect to data sources and generate APIs.

  1. Login to Cloud Hub and click Databases.
  2. Select "RSS" from Available Data Sources.
  3. Enter the necessary authentication properties to connect to RSS.

    You can connect to RSS and Atom feeds, as well as feeds with custom extensions. To connect to a feed, set the URL property. You can also access secure feeds. A variety of authentication mechanisms are supported. See the help documentation for details.

  4. Click Test Database.
  5. Click Privileges -> Add and add the new user (or an existing user) with the appropriate permissions.

With the virtual database created, you are ready to connect to RSS feeds from any MySQL client.

Create a FEDERATED Server and Tables for RSS Feeds

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

Create a FEDERATED Server

The following statement will create a FEDERATED server based on the Cloud Hub. Note that the username and password of the FEDERATED server must match a user account you defined on the Cloud Hub.

CREATE SERVER fedRSS
FOREIGN DATA WRAPPER mysql
OPTIONS (USER 'cloud_hub_user', PASSWORD 'cloud_hub_passwd', HOST 'myinstance.cdatacloud.net', PORT 3306, DATABASE 'rssdb');

Create a FEDERATED Table

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 (Latest News). Refer to the following template for the statement to create a FEDERATED table:

CREATE TABLE fed_latest news (
  ...,
  author  TYPE(LEN),
  pubdate  TYPE(LEN),
  ...,
)
ENGINE=FEDERATED
DEFAULT CHARSET=utf8
CONNECTION='fedRSS/Latest News';

NOTE: The table schema for the FEDERATED table must match the remote table schema exactly. You can always connect directly to the Cloud Hub using any MySQL client and run SHOW COLUMNS FROM Latest News to get the table schema.

Execute Queries

You can now execute queries to the RSS 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 RSS. Refer to the following example:

SELECT 
  fed_latest news.author, 
  local_table.custom_field 
FROM 
  local_table 
JOIN 
  fed_latest news 
ON 
  local_table.foreign_author = fed_latest news.author;