IT.Signals

As discussed in the Rails and Sybase Adapative Server Anywhere (SQLAnywhere) article I had to modify the odbc_adapter.rb code to allow the adapter to be used with my SybaseASA DB. Making the change to the adapter code directly is not an acceptable solution and until the developers of the adapter apply the change I had to come up with an alternate solution.

The solution I came up with was to monkey-patch the method responsible for checking the DB type to allow SybaseASA to be seen as a valid DB. I added the following code to my environment.rb:

# Monkeypatch the ODBC Adapter so that it will work with SybaseASA
# see http://odbc-rails.rubyforge.org/index.html
module ActiveRecord
  module ConnectionAdapters
    class ODBCAdapter < AbstractAdapter 
      alias :orig_dbmsNameToSym :dbmsNameToSym

      def dbmsNameToSym(dbmsName, dbmsVer)   
        begin
          # Call original method
          symbl = orig_dbmsNameToSym(dbmsName, dbmsVer)
        rescue ActiveRecord::ActiveRecordError
            # Catch exception if db not found in existing list, check
            # if SybaseASA, if not raise exception
            if dbmsName =~ /adaptiveserveranywhere/i
              symbl = :sqlanywhere
            else
              raise ActiveRecord::ActiveRecordError, "ODBCAdapter: Unsupported database (#{dbmsName})"
            end
        end
        return symbl
      end

    end
  end
end