[Import] a troublesome problem

Create a virtual directory in the database to manage directories and files. When copying files, you just copy a record, and the files with integrity do not move on the disk. When you delete a file, you need to delete the record and delete the file. When the number of files is less than the number of records, the problem exists ......

The solution is not difficult. When deleting a file record, you must first check whether there is a record with a guid file name in the database, and then determine whether to delete the files on the disk ..

Alas, I did not think of this problem during the design. I deleted a record and deleted the file. Other records in the database are related to the file. Note.

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