我是否知道如何在flutter中使用firebase数据库创建数据类,数据将立即加载到应用程序的第一页?
import 'package:dnow/model/company.dart';
import 'package:firebase_database/firebase_database.dart';
class RepoData {
static final Company bawp = new Company(
name: 'King',
about: 'Selling Food',
backdropPhoto: 'assets/hk.jpg',
shop: <Shop>[
new Shop(
shopName: 'ABC',
thumbnail: 'assets/daofang.png',
tel: "88776655",
address: '23 Daisy street, Sydney'),
new Shop(
shopName: 'KKK',
thumbnail: 'assets/fefew.png',
tel: "88776655",
address: '131 Man street, Sydney'),
],
location: 'Sydney',
logo: 'assets/logo.png',
president: 'Grand Production House');
}
[1]: https://i.stack.imgur.com/DV3X0.png
让我们说这是你的课程简化
Class Company {
String name;
String about;
String backdropPhoto;
String location;
String logo;
String president;
}
然后在您的应用程序的第一页中,您正在收听数据库并收到一家公司,就像这样
database.reference().child('companies').once().then((DataSnapshot snapshot) {
//todo: parse snapshot
});
在这里,您将从数据库中接收DataSnapshot对象。您需要做的是将DataSnapshot解析为您的Company类。为此,您需要在Company类中创建自定义构造函数,如下所示
import 'package:firebase_database/firebase_database.dart';
Class Company {
String name;
String about;
String backdropPhoto;
String location;
String logo;
String president;
Company.fromDb(DataSnapshot data) {
name = data['name'];
about = data['about'];
backdropPhoto = data['backdropPhoto'];
location = data['location'];
logo = data['logo'];
president = data['president'];
}
}
最后,当您从firebase接收文档时,您将调用此构造函数
database.reference().child('companies').once().then((DataSnapshot snapshot) {
Company company = Company.fromDb(snapshot);
});
我只与Firestore合作,但我认为这是可行的。希望能帮助到你