This will extract only users from selected database. Got it here at sqlservercentral, can't remember who though.

USE DATABASE

GO

select'CREATE LOGIN ' + sl.name +

' WITH PASSWORD = ' + sys.fn_varbintohexstr(sl.password_hash) +

' HASHED, SID = ' + sys.fn_varbintohexstr(sl.sid) +

', DEFAULT_DATABASE = ' + quotename(sl.default_database_name) +

', DEFAULT_LANGUAGE = ' + sl.default_language_name +

', CHECK_EXPIRATION = ' +

case

when sl.is_expiration_checked = 0 then 'off'

else 'on'

end + ', CHECK_POLICY = ' +

case

when sl.is_policy_checked = 0 then 'off'

else 'on'

end

from sys.sql_logins sl

where exists (select sid from sys.database_principals dp

where dp.sid = sl.sid) and sl.principal_id > 4

UNION ALL

select'CREATE LOGIN ' + QUOTENAME(sp.name) +

' FROM WINDOWS WITH DEFAULT_DATABASE = ' +

quotename(sp.default_database_name) + ', DEFAULT_LANGUAGE = ' +

sp.default_language_name

from sys.server_principals sp

where exists (select sid from sys.database_principals dp

where dp.sid = sp.sid) AND sp.principal_id > 4 AND sp.type IN ('G','U')