Flutter: Updating database structure - dart

Question

I'm using sqlflite with flutter app and I have this methode that initialize the database:
initDB() async{
String dbPath = await getDatabasesPath();
String path = join(dbPath, 'keemot.db');
var ourDB = await openDatabase(
path,
version: 1,
onCreate: _onCreat,
);
return ourDB;
}
and this is _onCreate method:
void _onCreat(Database db, int version) async{
await db.execute(
'CREATE TABLE $_table ('
'$_columnId INTEGER PRIMARY KEY,'
'$_columnTite TEXT,'
'$_columnDate TEXT,'
'$_columnTime TEXT,'
'$_columnMonth INTEGER,'
'$_columnDay INTEGER,'
'$_columnReiteration INTEGER,'
'$_columnReiterationTarget TEXT,'
'$_columnNotification INTEGER,'
'$_columnNotificationTarget TEXT'
')'
);
}
and I wanted to add another table so I did the following:
void _onCreat(Database db, int version) async{
print ('creating ... version => $version');
await db.execute(
'CREATE TABLE $_table ('
'$_columnId INTEGER PRIMARY KEY,'
'$_columnTite TEXT,'
'$_columnDate TEXT,'
'$_columnTime TEXT,'
'$_columnMonth INTEGER,'
'$_columnDay INTEGER,'
'$_columnReiteration INTEGER,'
'$_columnReiterationTarget TEXT,'
'$_columnNotification INTEGER,'
'$_columnNotificationTarget TEXT'
');'
'CREATE TABLE $_settingsTable (' // I added the table to this method like so
'$_settingsColumnLang VARCHAR (3)'
');'
);
}
But I'm getting this exception:
DatabaseException(no such table: settings)
I have updated the version in openDatabase() method, I thought it will recall the _onCreate() method, however still getting the same exception.
What should I do update the database structure ?

Answer 1

I think you should call db.execute two times for creating two seperate tables.
Also for cases like this I would recommend also providing the onUpgrade callback. You could do something like this:
var ourDB = await openDatabase(
path,
version: 3,
onCreate: _onCreat,
onUpgrade: _onUpgrade
);
And your upgrade method might look like this to drop the old table and call your onCreate method again:
_onUpgrade(Database db, int oldVersion, int newVersion) {
await db.execute("DROP TABLE IF EXISTS $_table");
_onCreat(db, newVersion);
}