I'm trying to find good ideas to rename files.
I have a small site with some editors and sometimes they upload files with the same name of a previous file. For example:
document.doc
I don't like the solution:
document(1).doc
Because it says nothing about the file, only that there was other 'similar' file before.
I thought to add a timestamp but it is not nice to download a file:
document_1348849299.doc
Do you have any suggestions or a really great way to name files?
I think you approach is a good one. You could format the timestamp to be a bit more attractive e.g. document_2012-09-28_11.59.00.doc
An alternative would be to keep a database table with files and a table with file versions. Name the file on disk after the file version id.
e.g. SQL Tables
File
FileID
FileName
CreatedBy
[Whatever]
FileVersion
FileVersionID
FileID
UserName
UploadTime
[Whatever]
~/file_store/
1.file
2.file
Related
Start situation:
a folder with lots of files (images mostly png).
two tables in database (MariaDB) which contains supposed image filenames. I query the filenames like this:
select filename from table1
UNION
select filename from table2;
I want to know if I have files not registered in the database tables.
My first approach is to put the list of filenames inside a textfile (I've used Linux command line, list is filename per line), but I don't know how to continue.
I can't write in the database. UPDATED. I got more auth to perform my job tasks. Therefore I solved this with the suggestion.
You need to do couple of things:
Import the file with list of files into the database.
Use cursor to go through the list of file names and match it to your table list which contains the list-b of file names
To import file name you can use the import method or directly read the file as a table virtually.
Thanks
I want to read a tab delimited file using PLSQL and insert the file data into a table.
Everyday new file will be generated.
I am not sure if external table will help here because filename will be changed based on date.
Filename: SPRReadResponse_YYYYMMDD.txt
Below is the sample file data.
Option that works on your own PC is to use SQL*Loader. As file name changes every day, you'd use your operating system's batch script (on MS Windows, these are .BAT files) to pass a different name while calling sqlldr (and the control file).
External table requires you to have access to the database server and have (at least) read privilege on its directory which contains those .TXT files. Unless you're a DBA, you'll have to talk to them to provide environment. As of changing file name, you could use alter table ... location which is rather inconvenient.
If you want to have control over it, use UTL_FILE; yes, you still need to have access to that directory on the database server, but - writing a PL/SQL script, you can modify whatever you want, including file name.
Or, a simpler option, first rename input file to SPRReadResponse.txt, then load it and save yourself of all that trouble.
My backup table has 3 files: 2 ending with .backup_info and one folder with another folder containing 10 CSV files. What would be format of the URL which will specify the backup file location?
I'm trying below and every time I get a file not found error.
gs://bucket_name/name_of_the_file_which_ended_with_backup_info.info
When you go to look at your file from your backup, it should have a structure like this:
Buckets/app-id-999999999-backups
And the filenames should look like:
2017-08-20T02:05:19Z_app-id-999999999_data.json.gz
Therefore the path will be:
gs://app-id-9999999999-backups/2017-08-20T02:05:19Z_app-id-9999999999_data.json.gz
Make sure you do not include the word "Buckets", I am guess that is the confusion.
I'm trying to use oracle external tables to load flat files into a database but I'm having a bit of an issue with the location clause. The files we receive are appended with several pieces of information including the date so I was hoping to use wildcards in the location clause but it doesn't look like I'm able to.
I think I'm right in assuming I'm unable to use wildcards, does anyone have a suggestion on how I can accomplish this without writing large amounts of code per external table?
Current thoughts:
The only way I can think of doing it at the moment is to have a shell watcher script and parameter table. User can specify: input directory, file mask, external table etc. Then when a file is found in the directory, the shell script generates a list of files found with the file mask. For each file found issue a alter table command to change the location on the given external table to that file and launch the rest of the pl/sql associated with that file. This can be repeated for each file found with the file mask. I guess the benefit to this is I could also add the date to the end of the log and bad files after each run.
I'll post the solution I went with in the end which appears to be the only way.
I have a file watcher than looks for files in a given input dir with a certain file mask. The lookup table also includes the name of the external table. I then simply issue an alter table on the external table with the list of new file names.
For me this wasn't much of an issue as I'm already using shell for most of the file watching and file manipulation. Hopefully this saves someone searching for ages for a solution.
I have created filestream group at C:\Test\FilestreamGroup1
and a table with varBinary Filstream column
Now when file is uploaded then it physically stored at FilestreamGroup1...
Now here I want to know two things
In which format file is stored at FilestreamGroup1 (for every single uploaded file I found 2 encoded file)?
secondly how to delete uploaded file physically (i.e. deleting a record from the table is like execute delete command, but doing this I'll not result in physical deletion of file from NTFS...so how can I delete a file physically)
If you want to delete files from FileSystem instanly then you need to force garbage collection manually by using checkpoint
Link
This is not a StackOverflow question, this belongs to ServerFault (admin). It toucehs dev though-
i.e. deleting a record from the table is like execute delete command, but doing this I'll not result in physical
deletion of file from NTFS...so how can I delete a file physically
Do you know what the primary reason is to hav a database? Guarantee data integrity.
A delete must keep the data around until a backup is taken. What is your backup policy? YOU may note that when you make an update, another copy of the file is created.... for that simple reason. The old one must still b e available for backup, and that is just how they integrate it.
In which format file is stored at FilestreamGroup1 (for every single uploaded file I found 2 encoded file)?
No, files are stored raw. What would be the sense to encode them... if there are SQL functions to get the path and it is a supported scenario that the client does not use SQL to load the file (but: asks SQL for the file name and path, then accesses it via NTFS file share). This also supports interop (as any program loading from a network can be fed a SQL driven location.
I strongly assume you have 1 copy only and somehow make an update resulting in a second file written.
http://msdn.microsoft.com/en-us/library/cc645962.aspx
has an explanation how to access FileSTream data with SQL.
http://technet.microsoft.com/en-us/library/cc645940(v=sql.105).aspx
has an explanation how to access FIleStream data using Win32.
FILESTREAM files being left behind after row deleted
explains while files are left behind when a row is deleted. I found that using the extremely trivial goodle search for "sql filestream delete file" and it was item 1 on the result list - did you even try google?
secondly how to delete uploaded file physically (i.e. deleting a record from the table is like execute delete command, but doing this I'll not result in physical deletion of file from NTFS...so how can I delete a file physically)
Checkpoint does not remove the files, files are removed in a backgroundprocess and it can take quite a while. To force deletion use
sp_filestream_force_garbage_collection
EDIT: works with SQL Server 2012 only
Write "checkpoint" after deleting a row. it will remove physical existence of file.
Run the below query and check, the file getting deleted from file system automatically
DELETE FROM TableName CHECKPOINT
Thanks.