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16.8.2.2 Creating a FEDERATED Table Using CREATE SERVER

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If you are creating a number of FEDERATED tables on the same server, or if you want to simplify the process of creating FEDERATED tables, you can use the CREATE SERVER statement to define the server connection parameters, just as you would with the CONNECTION string.

The format of the CREATE SERVER statement is:

  1. CREATE SERVER
  2. server_name
  3. FOREIGN DATA WRAPPER wrapper_name
  4. OPTIONS (option [, option] ...)

The server_name is used in the connection string when creating a new FEDERATED table.

For example, to create a server connection identical to the CONNECTION string:

  1. CONNECTION='mysql://fed_user@remote_host:9306/federated/test_table';

You would use the following statement:

  1. CREATE SERVER fedlink
  2. FOREIGN DATA WRAPPER mysql
  3. OPTIONS (USER 'fed_user', HOST 'remote_host', PORT 9306, DATABASE 'federated');

To create a FEDERATED table that uses this connection, you still use the CONNECTION keyword, but specify the name you used in the CREATE SERVER statement.

  1. CREATE TABLE test_table (
  2.     id     INT(20) NOT NULL AUTO_INCREMENT,
  3.     name   VARCHAR(32) NOT NULL DEFAULT '',
  4.     other  INT(20) NOT NULL DEFAULT '0',
  5.     PRIMARY KEY  (id),
  6.     INDEX name (name),
  7.     INDEX other_key (other)
  8. )
  9. ENGINE=FEDERATED
  10. DEFAULT CHARSET=utf8mb4
  11. CONNECTION='fedlink/test_table';

The connection name in this example contains the name of the connection (fedlink) and the name of the table (test_table) to link to, separated by a slash. If you specify only the connection name without a table name, the table name of the local table is used instead.

For more information on CREATE SERVER, see Section 13.1.18, “CREATE SERVER Syntax”.

The CREATE SERVER statement accepts the same arguments as the CONNECTION string. The CREATE SERVER statement updates the rows in the mysql.servers table. See the following table for information on the correspondence between parameters in a connection string, options in the CREATE SERVER statement, and the columns in the mysql.servers table. For reference, the format of the CONNECTION string is as follows: 

scheme://user_name[:password]@host_name[:port_num]/db_name/tbl_name
Description CONNECTION string CREATE SERVER option mysql.servers column
Connection scheme scheme wrapper_name Wrapper
Remote user user_name USER Username
Remote password password PASSWORD Password
Remote host host_name HOST Host
Remote port port_num PORT Port
Remote database db_name DATABASE Db

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Document created the 26/06/2006, last modified the 26/10/2018
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