Can't create a database. No db in device file explorer - sqlite

Question

I am trying to make a little project in Flutter where I add some data in a form along with a few images in the sqflite database, but I can't figure out why exactly my code isn't working.
Here is my db_helper class
Future<Database> get db async {
if (_db != null)
return _db;
_db = await initDb();
return _db;
}
//Creating a database with name test.dn in your directory
initDb() async {
io.Directory documentsDirectory = await getApplicationDocumentsDirectory();
String path = join(documentsDirectory.path, "products.db");
var theDb = await openDatabase(path, version: 1, onCreate: _onCreate);
return theDb;
}
// Creating a table name Employee with fields
void _onCreate(Database db, int version) async {
// When creating the db, create the table
await db.execute(
"""CREATE TABLE product(
id INTEGER PRIMARY KEY AUTOINCREMENT,
name TEXT NOT NULL,
brand TEXT NOT NULL,
color TEXT NOT NULL,
size INTEGER NOT NULL,
qty INTEGER NOT NULL)""");
await db.execute(
"""CREATE TABLE image(
id INTEGER PRIMARY KEY AUTOINCREMENT,
path TEXT,
product_id INTEGER,
FOREIGN KEY(product_id) REFERENCES product (id)
ON DELETE NO ACTION ON UPDATE NO ACTION)""");
debugPrint("Created tables");
}
// Get all products
Future<List<Map<String, dynamic>>> getProducts() async {
Database db = this.initDb();
var result = await db.query('product');
return result;
}
// Inser or update image
Future<product_model.Image> insertImage(product_model.Image image) async {
// var count = Sqflite.firstIntValue(await _db.rawQuery("SELECT COUNT(*) FROM image WHERE username = ?", [image.id]));
Database database = await db;
await database.insert("image", image.toMap(), conflictAlgorithm: ConflictAlgorithm.ignore);
// await _db.update("image", image.toMap(), where: "id = ?", whereArgs: [image.id]);
return image;
}
// Inser or update product
Future<product_model.Product> insertProduct(product_model.Product product) async {
// var count = Sqflite.firstIntValue(await _db.rawQuery("SELECT COUNT(*) FROM product WHERE username = ?", [product.id]));
Database database = await db;
await database.insert("product", product.toMap(), conflictAlgorithm: ConflictAlgorithm.ignore);
// await _db.update("product", product.toMap(), where: "id = ?", whereArgs: [product.id]);
return product;
}
And here is where I call the db:
void _saveProductWithPictures() async{
db = DBHelper();
// var db = await dbHelper.initDb();
product = db_elements.Product();
imageModels = List<db_elements.Image>();
int result;
await db.insertProduct(product).whenComplete(() => {
_nameController.clear(),
_brandController.clear(),
_colorController.clear(),
_sizeController.clear(),
_qtyController.clear()
});
if (result != 0) { // Success
_showAlertDialog('Status', 'Note Saved Successfully');
} else { // Failure
_showAlertDialog('Status', 'Problem Saving Note');
}
//save the product
// end save the product
//save the product picture/s
for (var i in _files) imageModels.add(db_elements.Image(path: i.path.toString()));
for (var image in imageModels) await db.insertImage(image).whenComplete(() => {
_files.clear()
});
//end save the product picture/s
}
I tried for weeks to fix this, but still hopeless. I can't save data to the database. Appreciate any kind of help. Thanks in advance