搜索firbase文档中的flutter dart中的特定字段并将其存储

import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

void main() async {
  // 初始化Firebase
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  runApp(MyApp());
}

// 获取对应的集合
CollectionReference collectionRef =
    FirebaseFirestore.instance.collection('collectionName');

// 查询特定字段
QuerySnapshot querySnapshot =
    await collectionRef.where('fieldName', isEqualTo: 'value').get();

// 遍历查询结果
querySnapshot.docs.forEach((doc) {
  // 获取字段值
  var fieldValue = doc.data()['fieldName'];

  // 打印字段值
  print('字段值: $fieldValue');
});

// 存储特定字段
Map<String, dynamic> data = {
  'fieldName': 'value',
};

collectionRef.add(data);