class method self.build

# File railties/lib/rails/generators/database.rb, line 72
        def build(database_name)
          case database_name
          when "mysql" then MySQL2.new
          when "postgresql" then PostgreSQL.new
          when "trilogy" then Trilogy.new
          when "sqlite3" then SQLite3.new
          when "mariadb-mysql" then MariaDBMySQL2.new
          when "mariadb-trilogy" then MariaDBTrilogy.new
          else Null.new
          end
        end