You could use a mdf open file tool <REMOVED>
But before if you don't have the ldf file, you can use this SQL command:
sp_attach_single_file_db @dbname= 'databasename', @physname= 'C:\Users\Blake\Documents\Databases\databasefile.mdf'
or you can:
CREATE DATABASE TestDb ON
(FILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\TestDb.mdf')
FOR ATTACH_REBUILD_LOG
GO