How to get the total of column values in sqflite in flutter? - flutter

Question

I want to get the total of the price column values and save it in a variable and return it...I have gone through other posts one of which is the question which i am asking but it was in android native and i am new to sqflite so i couldnt figure out how to write the code. So please help me with suggestions.
this is my code of the columns i am using
void _onCreate(Database db, int version) async {
await db.execute(
"CREATE TABLE Cart(id INTEGER PRIMARY KEY,name TEXT, price TEXT,category
TEXT,images TEXT)");
print("DB created");
}
I am trying to do this
Future calculateTotal() async{
var dbClient = await db;// couldnt figure out after this
var cursor = dbClient.rawQuery("SELECT SUM(price) as Total FROM Cart",
null);
if(cursor.move)
}

Answer 1

According to https://www.techiediaries.com/flutter-sqlite-crud-tutorial/ this should do:
Future calculateTotal() async {
var dbClient = await db;
var result = await dbClient.rawQuery("SELECT SUM(price) as Total FROM Cart");
print(result.toList());
}
int _total;
void _calcTotal() async{
var total = (await db.calculateTotal())[0]['Total'];
print(total);
setState(() => _total = total)
}
#override
Widget build(BuildContext context) {
...
Text(_total != null ? _total : 'waiting ...', ... )

Answer 2

Future<List> calculateTotal() async {
var dbClient = await db;
var result = await dbClient.rawQuery("SELECT * FROM Cart");
return result.toList();
}
int _total = 0;
List priceList;
void _calcTotal() async{
priceList = await db.calculateTotal();
priceList.forEach((price){ _total = _total + price['price'];});
print(_total);
setState(() => _total = total);
}
#override
Widget build(BuildContext context) {
...
Text(_total != null ? _total : 'waiting ...', ... )