Qt SQLite database without absolute path - database

Is there a way to reference the database.sqlite file without knowing the absolute path?
_db = QSqlDatabase::addDatabase("QSQLITE");
_db.setDatabaseName("/the/path/i/dont/know/database.sqlite");
I already tried to add the database.sqlite to the Resources folder and call it via qrc:, but apparently it is not possible to write to a resource file.
I also tried using QApplication::applicationDirPath();, but this would result in different paths depending on the user's OS. E.g. it appends MyApp.app/Contents/MacOS to the actual directory.

When you create a QSqlDatabase with SQLite as a backend you have two options:
Give an absolute path as a db name
Give a relative path: in this case the database will be saved in the directory of your binary.
So you must know absolute path of your db in your case.
edit
In the case you initially know where the database should be located you can either hardcode it (which is never wise) or you can create a configuration and load it using QSettings. For example:
QSettings settings;
QString dbPath = settings.readValue("DBPath", QString(/*fallback path*/)).toString();
//do smth with dbPath
Take a look further here

if you want to store the db per user you shout use this:
QDesktopServices::storageLocation(QDesktopServices::DataLocation)
this method returns the location where persistent application data can be stored.
for more information check this: http://doc.trolltech.com/4.5/qdesktopservices.html#storageLocation

Related

How to store multiple pdf file into public folder using laravel 8 in controller?

This my data that I want to store my pdf files in my public folders. Anyone can give me any idea?
I tried to foreach the data to get that file but it seems not working in my end. Anyone can help me?
To store files in your public folder you can use the public disk that's included in your application's filesystems configuration file, the default config will store files in storage/app/public.
To make these files accessible from the web though (which I'm assuming is what you want) you need to create a symbolic link from public/storage to storage/app/public.
To do that just run:
php artisan storage:link
Once you've done this you can use Laravel's storage facade to interact with the files in your public folder to save, retrieve and download them.
Store
use Illuminate\Support\Facades\Storage;
Storage::put('file.jpg', $contents);
Download
return Storage::download('file.jpg');
return Storage::download('file.jpg', $name, $headers);
Retrieve
$contents = Storage::get('file.jpg');
If you need to store user uploaded files to your public storage, you can do it like this:
$path = $request->file('yourUploadedPdf')->store('yourPdfsFolder');
Laravel's store method will generate a unique ID for the filename and the extension will be determined by the MIME type of the uploaded file. The store method also returns the path, including the generated filename, so you can store it in your DB if needed.
If you need to specify the filename then you can do this:
$path = $request->file('pdf')->storeAs(
'yourPdfsFolder', 'yourPdfFileName'
);
Just a note, I'm assuming you'll be having public as your default disk, if not, then you'll need to specify the disk you're using in these method / Storage facade calls.
And a further note, when using the public disk, everything - by default - gets stored under storage/app/public so anytime you're defining a folder to store your uploaded PDFs under, it'll be storage/app/public/yourFolder.

Drupal upload then move doesn't update path or filename in file list

I have a custom form using a "managed_file" which uploads to temp folder. Programmatically, I then load that file and move it to its permanent storage (overwriting any existing file with the* name) e.g.
// Upload file
$upfile = $this->entityTypeManager->getStorage('file')->load($fid);
// Source and destination
$sourceUri = $this->fileSystem->realpath($upfile->getFileUri());
$destinationUri = $this->fileSystem->realpath(\Drupal::config('system.file')->get('default_scheme') . "://") . '/x/y/z/XYZ_NEW.pdf';
// Move and overwrite
$this->fileSystem->move($sourceUri, $destinationUri, FileSystemInterface::EXISTS_REPLACE);
All of this works (i.e. the file physically is moved into the correct place with correct name); however, the file displayed in the listings (i.e. /admin/content/files) still shows the incorrect temporary folder as the URI.
Basically the file in the listings page seems to be showing the original filepath and name* of a previously successfully moved* file.
If I load this file with incorrect URI, i.e. using the incorrect temp path, the data loads, but then will not have a file info (as it doesn't exist. Also clicking the filename by browser under listings will show page not found and the URL showing the old URL i.e. /system/temporary?file=XYZ.pdf).
If I load this file by correct URI, i.e. using the correct destination path, file not found - same if I go to the path directly in the browser.
It appears the managed file doesn't know it was moved. How to resolve this bug?
The docs for FileSystem::move say "Moves a file to a new location without database changes or hook invocation."
So you are going to need to update the file entity with the new values..
Try this, untested:
// Upload file
$upfile = $this->entityTypeManager->getStorage('file')->load($fid);
// Source and destination
$sourceUri = $this->fileSystem->realpath($upfile->getFileUri());
$destinationUri = $this->fileSystem->realpath(\Drupal::config('system.file')->get('default_scheme') . "://") . '/x/y/z/XYZ_NEW.pdf';
// Move and overwrite
$newFileName = $this->fileSystem->move($sourceUri, $destinationUri, FileSystemInterface::EXISTS_REPLACE);
// Set the new file path on the file entity.
$upfile->setFileUri($newFileName);
// Set the file to permanent if needed.
$upfile->setPermanent();
// Save entity with changes.
$upfile->save();
I did not test this though.
You can check the functions on the file entity in the docs here
It turns out the class based methods do not update the database
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21File%21FileSystem.php/function/FileSystem%3A%3Amove/8.9.x
The procedural version does
https://api.drupal.org/api/drupal/core%21modules%21file%21file.module/function/file_move/8.9.x

Can Hive in Flutter Store BigData(some GB files)

I was thinking if I store a video or a movie and open that box will that video will be stored in my RAM or else it just load from ROM. I am a bit confused: Can anyone explain this to me?
I think you have misunderstood the concept of Database.
Any Database solution is to only store pure informational organized data. Not to store large files such as media, documents, or images.
On the contrary, storage need not be organized, all files can exist in one folder.
So, any database solution you use, always store Data Types.
In this case you can have a Data Model, which is also an essential thing in using a Database.
#HiveType(typeId: 0)
class Movie extends HiveObject {
#HiveField(0)
String name;
#HiveField(1)
int path;
}
Since Hive supports Dart objects, you don't have to convert toJson or any such for string the Data.
So when you have the file fetched from Storag, you can get the path using path_provider or from the File itself, and then Create a Object
File file = await // get the movie file using any means
final path = file.path
var box = await Hive.openBox('Movies');
var m = Movie()
..name = 'Batman Begins'
..path = path ;
box.add(m);
m.save();
Hope this clears your doubt.
Copy/save your video/media files in the Local File Storage and save file path in Hive Box.
Whenever you need get path from hive then get the file from local storage using that path.

How to delete a File in Google Drive?

How do I write a Google Apps Script that deletes files?
This finds files:
var ExistingFiles = DocsList.find(fileName);
But DocsList.deleteFile does not exist to delete a file.
Is there a way to move those files to another Folder or to Trash?
The other workaround I would consider is to be able to override an existing file with the same name.
Currently when I want to create a file with a name already used in MyDrive then it creates a second file with the same name. I would like to keep 1 file (the new one is kept and the old one is lost).
There are 3 services available to delete a file.
DriveApp - Built-in to Apps Script
Advanced Drive Service - Built-in to Apps Script but must be enabled. Has more capability than DriveApp
Google Drive API - Not built-in to Apps Script, but can be used from Apps Script using the Drive REST API together with UrlFetchApp.fetch(url,options)
The DocsList service is now deprecated.
The Advanced Drive Service can be used to delete a file without sending it to the trash. Seriously consider the risk of not being able to retrieve the deleted file. The Advanced Drive Service has a remove method which removes a file without sending it to the trash folder. Advanced services have many of the same capabilities as the API's, without needing to make an HTTPS GET or POST request, and not needing an OAuth library.
function delteFile(myFileName) {
var allFiles, idToDLET, myFolder, rtrnFromDLET, thisFile;
myFolder = DriveApp.getFolderById('Put_The_Folder_ID_Here');
allFiles = myFolder.getFilesByName(myFileName);
while (allFiles.hasNext()) {//If there is another element in the iterator
thisFile = allFiles.next();
idToDLET = thisFile.getId();
//Logger.log('idToDLET: ' + idToDLET);
rtrnFromDLET = Drive.Files.remove(idToDLET);
};
};
This combines the DriveApp service and the Drive API to delete the file without sending it to the trash. The Drive API method .remove(id) needs the file ID. If the file ID is not available, but the file name is, then the file can first be looked up by name, and then get the file ID.
In order to use DriveAPI, you need to add it through the Resources, Advanced Google Services menu. Set the Drive API to ON. AND make sure that the Drive API is turned on in your Google Cloud Platform. If it's not turned on in BOTH places, it won't be available.
Now you may use the following if the file is as a spreadsheet, doc etc.:
DriveApp.getFileById(spreadsheet.getId()).setTrashed(true);
or if you already have the file instead of a spreadsheet, doc etc. you may use:
file.setTrashed(true);
This code uses the DocsList Class which is now deprecated.
try this :
function test(){
deleteDocByName('Name-of-the-file-to-delete')
}
function deleteDocByName(fileName){
var docs=DocsList.find(fileName)
for(n=0;n<docs.length;++n){
if(docs[n].getName() == fileName){
var ID = docs[n].getId()
DocsList.getFileById(ID).setTrashed(true)
}
}
}
since you can have many docs with the same name I used a for loop to get all the docs in the array of documents and delete them one by one if necessary.
I used a function with the filename as parameter to simplify its use in a script, use test function to try it.
Note : be aware that all files with this name will be trashed (and recoverable ;-)
About the last part of your question about keeping the most recent and deleting the old one, it would be doable (by reading the last accessed date & time) but I think it is a better idea to delete the old file before creating a new one with the same name... far more logical and safe !
Though the The service DocsList is now deprecated, as from the Class Folder references, the settrashed method is still valid:
https://developers.google.com/apps-script/reference/drive/folder#settrashedtrashed
So should work simply this:
ExistingFiles.settrashed(true);
Here is another way to do it without the need of Drive API. (based on Allan response).
function deleteFile(fileName, folderName) {
var myFolder, allFiles, file;
myFolder = DriveApp.getFoldersByName(folderName).next();
allFiles = myFolder.getFilesByName(fileName);
while (allFiles.hasNext()) {
file = allFiles.next();
file.getParents().next().removeFile(file);
}
}
Here is a slightly modified version using the above. This will backup said file to specified folder, also remove any old previous backups with the same name so there are no duplicates.
The idea is here to backup once per day, and will retain 1 month of backups in your backup folder of choice. Remember to set your trigger to daily in your Apps Script.
https://gist.github.com/fmarais/a962a8b54ce3f53f0ed57100112b453c
function archiveCopy() {
var file = DriveApp.getFileById("original_file_id_to_backup");
var destination = DriveApp.getFolderById("backup_folder_name");
var timeZone = Session.getScriptTimeZone();
var formattedDate = Utilities.formatDate(new Date(),timeZone,"dd"); // 1 month backup, one per day
var name = SpreadsheetApp.getActiveSpreadsheet().getName()+"_"+formattedDate;
// remove old backup
var allFiles = destination.getFilesByName(name);
while (allFiles.hasNext()) {
var thisFile = allFiles.next();
thisFile.setTrashed(true);
};
// make new backup
file.makeCopy(name,destination);
}

How to create file in current system from within Grails controller action and save data fetched from database?

In my Grails application I need to create a file in current system in which I need to save information fetched from table in database. How to do this from within controller action? I don't have any idea of it.
I have created file as
File file=new File("file name.txt")
file.createNewFile();
then I have wrote values of MySQL database table fields in it as:
file<<patient.id
file<<patient.name
.
.
.
it stores data like continuous text but I want to have a .doc file in which data should get stored in table. I found Apache's POI for creating doc file but I am not getting how it works and how I should use it.
Not sure exactly what you want to store in a file but below is an example of how to easly write a String to a file using Apache-commons-io Which should be included in grails
import org.apache.commons.io.FileUtils;
class SomeController{
def writeToFile = {
def data = getSomeStringData();
def fileStore = new File("./path/to/files/ControllerOutput_${new Date()}.txt");
fileStore.createNewFile();
FileUtils.writeStringToFile(fileStore, data);
println("your file was created # {fileStore.absolutePath} and is ${fileStore.length()} bytes");
}
}
Does this help? If not, you need to explain exactly what your looking for.
This is a comment to Michael's answer (unfortunately I still don't have the reputation to reply on answers).
If you're struggling around the problem how to specifiy the relative path from within your controller's context, this might help you:
So if you have following folder you want to read/write files from/into"..
/myproject/web-app/temp/
you can access the file like this:
import org.codehaus.groovy.grails.commons.ApplicationHolder as AH
// getResource references to the web-app folder as root folder
Resource resource = AH.getApplication().getParentContext().getResource("/temp/myfile.txt)

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