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Connect to FTP Data as a Federated Tables in MySQL

Use the CData Cloud Hub to set up federated tables for FTP data in MySQL .

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

The CData Cloud Hub provides a pure MySQL, cloud-to-cloud interface for FTP, allowing you to easily query live FTP data 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 FTP, leveraging server-side processing to quickly return FTP data.

Create a Virtual MySQL Database for FTP Data

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 "FTP" from Available Data Sources.
  3. Enter the necessary authentication properties to connect to FTP.

    To connect to FTP or SFTP servers, specify at least RemoteHost and FileProtocol. Specify the port with RemotePort.

    Set User and Password to perform Basic authentication. Set SSHAuthMode to use SSH authentication. See the Getting Started section of the data provider help documentation for more information on authenticating via SSH.

    Set SSLMode and SSLServerCert to secure connections with SSL.

    The data provider lists the tables based on the available folders in your FTP server. Set the following connection properties to control the relational view of the file system:

    • RemotePath: Set this to the current working directory.
    • TableDepth: Set this to control the depth of folders to list as views.
    • FileRetrievalDepth: Set this to retrieve and list files recursively from the root table.

    Stored Procedures are available to download files, upload files, and send protocol commands. See the Data Model chapter of the FTP data provider documentation for more information.

  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 FTP data from any MySQL client.

Create a FEDERATED Server and Tables for FTP Data

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 fedFTP
FOREIGN DATA WRAPPER mysql
OPTIONS (USER 'cloud_hub_user', PASSWORD 'cloud_hub_passwd', HOST 'myinstance.cdatacloud.net', PORT 3306, DATABASE 'ftpdb');

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

CREATE TABLE fed_mydirectory (
  ...,
  filesize  TYPE(LEN),
  filename  TYPE(LEN),
  ...,
)
ENGINE=FEDERATED
DEFAULT CHARSET=utf8
CONNECTION='fedFTP/MyDirectory';

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 MyDirectory to get the table schema.

Execute Queries

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

SELECT 
  fed_mydirectory.filesize, 
  local_table.custom_field 
FROM 
  local_table 
JOIN 
  fed_mydirectory 
ON 
  local_table.foreign_filesize = fed_mydirectory.filesize;