How really works the app updater

Development
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1

Hello,

I explain my question :

I am currently developing an application with persistent data in a json file

if I publish a new version. will the update tool erase all files, including my persistent file json and even erase all user data?

thank you all

2

Where are you storing the json file? Generally speaking you should store it somewhere within the data folder.

Furthermore it is best practice to store information in the database.

3

I understand that, but given the little data stored here, I made that choice. moreover, the owncloud API is very hard to learn and I have not figured out how to use it properly for storage in the database.

4

@DeepDiver1975
Hello,
finally, on your advice, i've refactored my app and i've learnt how to keep data in the database. But i've an issue when i drop my table to test a manual installation of my app by deleting my app folder and replacing it by a new folder.

When i enable the app the table is not created in database. i've used a database.xml in my appInfo folder.

could you explain me in the main lines the way to allow app to create automatically tables in database after app installation/activation

thank you a lot

5

Any change to the database is handled via migrations - please follow the docs here https://doc.owncloud.org/server/10.0/developer_manual/app/fundamentals/database.html#database-migrations