Solve the problem that the sp_attach_db command fails.

Today, the following error occurs when you use the sp_attach_db 'dbname', 'datafilefullname', and 'logfilefullname' commands to append a database file to sqlserver2008:

MSG 3415, level 16, State 3, line 1

Database [Dbname ]Cannot be upgraded because it is read-only or has read-only files. Make the database or files writeable, and rerun recovery. MSG 1813, level 16, state 2, line 1 Cocould not open new database [Dbname]. Create Database is aborted. The solution obtained after Google is to remove the read-only attribute of the directory where MDF and LDF are located and set the Everyone user's permission to fullcontrol, which is hereby recorded.