ServiceStack OrmLite with multiple Database Servers

Yes it is possible and support for this is already built into the OrmLiteConnectionFactory, see the Master SQLServer + Sqlite shard example on OrmLite's project home page.

Basically you would register your default (or master) connection first with:

var dbFactory = new OrmLiteConnectionFactory(
  "Data Source=host;Initial Catalog=RobotsMaster;Integrated Security=SSPI", 
  SqlServerDialect.Provider);

Then you would register a named connection for every other connection you wish to support, e.g:

dbFactory.RegisterConnection("shard-1", 
  "~/App_Data/{0}.sqlite".Fmt(shardId).MapAbsolutePath(),
    SqliteDialect.Provider);

Once that's configured, opening a connection without specifying a name will open a connection to the default database, e.g:

using (IDbConnection db = dbFactory.OpenDbConnection()) { ... } //Default DB

Whilst you can specify a name to open up a named connection to a db with a different provider, e.g:

using (var dbShard = dbFactory.OpenDbConnection("shard-1")) { ... } //Named DB

Manually use different Dialect Providers

The differences between the SQL Provider implementations between different RDBMS's are contained within each dialect provider. So if you want to use OrmLite's convenience extension methods against an specific ADO.NET provider implementation you just need to assign the ThreadStatic DialectProvider you wish to use, e.g:

OrmLiteConfig.DialectProvider = SqlServerDialect.Provider;
var dbConn = new SqlConnection(SqlServerConnString);
dbConn.Select<Table>(); //All db access now uses the above dialect provider

This is essentially all what RegisterConnection in OrmLiteConnectionFactory automatically does behind the scenes for you.

For reference here are all the dialect providers for OrmLite up to this point:

SqlServerDialect.Provider
SqliteDialect.Provider (different 32/64 and Mono impls available)
MySqlDialect.Provider
PostgreSqlDialect.Provider
OracleDialect.Provider
FirebirdDialect.Provider

Manually use different Dialect Providers

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