i made a flutter app which creates then uses an sqlite db.
To share my app, i used to upload the apk file in google drive, but everytime it is downloaded then installed on a phone, the db is empty.
I want to share the app with the db filled, but i don't know how to do this.
Any help please ?
When your users run app at first time, their database is empty. Your problem can be solved by two ways:
Create entities in database (data that you sharing) at database initialization.
Create a backup feature that provides possibility to import database from the user's storage (just replace db file in app's internal folder by db file from external storage (Downloads folder for example)).
I have a SQLite .db file that I want to access through sqflite on Flutter. Where in the Flutter project am I supposed to put it so that I can access it both on Android and iOS? How do I make sure that it's shipped with the apk? All examples that I found assume that the db needs to be created from scratch at the first launch.
You can put the db file in your assets folder and declare it in your pubspec.yaml. On startup you can write it out to disk and then use that path with your connection string to connect the db.
You can read from assets using
var dbContent =
await rootBundle.load('assets/database/mydb.db');
Then write it out to your file system and go from there.
I've found that this problem is related to:
https://stackoverflow.com/a/51387985/3902715
Credits to R. C. Howell
I have deployed the 1st version of my wp8 in wp store and now i want to deploy the update version of it. Though I know the process of update deployment, but my concern is the sqlite file which doesn't get updated.
Here is the scenario, I have sqlite file in the app where user can store config and setting, in new version I added extra tables and I want to these tables should be reflected in the the update without affecting user settings and config.
What points I should consider to take care of this issue?
Thanks!
Assuming the data in the sqlite database is static you can give the database a new name and submit it with the updated app. One first run copy the new database to isolated storage and delete the old version of the database to save space.
If the user is inputting data into the database you will have to include code to modify the database structure on the first run and insert any records into the new table
If I setup a database like so:
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setHostName("localhost");
db.setDatabaseName("data.db");
Where is the file actually stored? Is there a way to set this and have control over that? I have heard that you can also opt for an SQLite database to only be stored in memory, not on disk. How would you do this?
setDatabaseName for SQLite works just as normal filenames. Unless you specify full path, the file is created in the process' working directory.
For memory storage, try to speci.fy ":memory:" as database name. See also Saving and restoring an in-memory SQLite database
Where is the SQLite database stored i.e. directory path on windows 7 when created ?
A SQLite database is a regular file. It is created in your script current directory.
.databases
If you run this command inside SQLite
.databases
it lists the path of all currently connected databases. Sample output:
seq name file
--- --------------- ----------------------------------------------------------
0 main /home/me/a.db
There is no "standard place" for a sqlite database. The file's location is specified to the library, and may be in your home directory, in the invoking program's folder, or any other place.
If it helps, sqlite databases are, by convention, named with a .db file extension.
If you are running Rails (its the default db in Rails) check the {RAILS_ROOT}/config/database.yml file and you will see something like:
database: db/development.sqlite3
This means that it will be in the {RAILS_ROOT}/db directory.
When you call sqlite3_open() you specify the filepath the database is opened from/saved to, if it is not an absolute path it is specified relative to your current working directory.
It depends on how you initialized the database. If you used the command line shell for SQLite (e.g. sqlite3 ex1) to create the database, it'll be a path from the root of your local machine. If you used a Python script to create the database, it'll be a path from your project.
To check the former, run the command line shell:
sqlite3
sqlite> .databases
To check the path in your project, you can print the path in the connection. For example:
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
DATABASE = 'db'
def get_db_connection():
print(os.path.join(BASE_DIR, DATABASE, "database.db"))
conn = sqlite3.connect(os.path.join(BASE_DIR, DATABASE, "database.db"))
conn.row_factory = sqlite3.Row
return conn
In my case I think it was an access issue. I saved the SQLite files to "C:/Program Files (x86)/sqlite". I CD'd there, ran sqlite3, and created a database called test.db:
As you can see, I ran .database, which told me the .db file was created in the same directory, so I went to confirm in File Explorer, and it wasn't there:
Curiously the database was working correctly in spite of this.
It was only through trial-and-error that I discovered that I could save in some locations, but not others. It appears to me that SQLite can't save to locations that require elevation. In my case, moving from Program Files to My Documents made the issue go away.
I find it quite irritating that SQLite doesn't just tell me "access denied" instead of trying to be clever and saving to some location that I can't even find.
In Windows machines (Windows 2010), by default, the new SQLite database files will be stored in the same folder where Sqlite3.EXE application is stored in your machine. However , we can create a new folder in Windows and within sqlite> prompt, you may use the .cd to change to the new working directory.
It is a good idea to give a .db file extension to the new database files that you create (even though it is not mandatory to have any file extension)
The SQLite command, .databases will show the default database "main" or currently created or currently opened database or all "attached" database files with file path. The .attach is useful to attach more than one database file to the current connection when we want to work with tables belonging to different databases.
Regards,
Biju Joseph N.,
Houston TX, USA (January 12, 2023)
the database path will be displayed, when using .databases
SQLite is created in your python directory where you installed the python.
SQLit Database is simply a file where your local data is stored on your local machine
In Windows 10 if in the prompt command the path where you start sqlite is
C:\users\USER_NAME
You can find it in the user home folder.
The .db file is stored where you start the sqlite command.
I hope this solve the issue