Question

I need to connect 2 tables from 2 different servers.

How can I do that in C#?

This is what I have so far:

cmd = new MySqlCommand(String.Format("INSERT INTO {0} (a,b,c,d) SELECT (a,b,c,d) FROM {1}", ConfigSettings.ReadSetting("main_table"), ConfigSettings.ReadSetting("main_table")), con);

ConfigSettings.ReadSetting("main_table") for both of them is the same.

 con.ConnectionString = ConfigurationManager.ConnectionStrings["con1"].ConnectionString;
 con2.ConnectionString = ConfigurationManager.ConnectionStrings["con2"].ConnectionString

How to make this cmd to be workking with 2 different connection strings and with the same name for the table. Table name will change that’s why it is saved in config.

Answer 1

MySQL cannot dynamically link servers.

If you want a direct copy between the databases, you would need to create a FEDERATED table on the target server which would point to the source server, and just issue this command:

INSERT
INTO    main_table (a, b, c, d)
SELECT  a, b, c, d
FROM    federated_main_table

on the target server.

If you have multiple source servers and / or tables, you should create a federated table for each of them.

The other option would be selecting all data from the source server onto the client (into an array, persistent recordset etc.), then insert data cached on the client into the table on the target server.