Get Data from Two Tables Floor Flutter - database

Question

I want to get data from two tables using floor in flutter, how can I do that?
this code for getting data from one table. this function inside database.g.dart:
Stream<List<Item>> getItems() {
return _queryAdapter.queryListStream(
'SELECT * FROM Item WHERE is_active = 1',
mapper: (Map<String, Object?> row) => Item(
id: row['id'] as int?,
item_id: row['item_id'] as String,
description: row['description'] as String,
salePrice: row['sale_price'] as double,
purchasePrice: row['purchase_price'] as double,
isActive: row['is_active'] as int),
queryableName: 'Item',
isView: false);
}
So the return will be Item objects but what if I have junction table from another tables and the command will be like this:
SELECT junctiont.*, item.*, client.*
FROM item
INNER JOIN junctiont
ON item.id = junctiont.item_id
INNER JOIN client
ON junctiont.client_id = client.id
How the function will be? and what will return?.

Answer 1

I found the answer by create new object to return the whole coming columns or you can return to list
#override
Stream<List<List>> getBillsMainInfo() {
return _queryAdapter.queryListStream(
'SELECT Bills.id, Biils.bill_number, Bills.total, Bills.datetime, Clients.name FROM Bills INNER JOIN Clients ON Bills.client_id = Clients.id WHERE Bills.is_active = 1',
mapper: (Map<String, Object?> row) => [
row['id'] as int,
row['bill_number'] as int,
row['datetime'] as String,
row['name'] as String,
row['total'] as double
],
queryableName: 'Bills',
isView: false);
}