dart - 颤振，将数据保存到资产文件夹中的sqlite数据库

Question

我制作dogdb.db，插入3行数据，保存在flutter项目的assets文件夹中，注册到pubspec.yaml。然后，我运行以下代码并重新打开我的 dogdb.db 我找不到新添加的数据。

1. 如何将数据保存到资产文件夹中的 dogdb.db？

2. 如何保护资产文件夹中的 sqlite 数据库？

   import 'dart:async';
   import 'dart:io';
   import 'package:flutter/services.dart';
   import 'package:path/path.dart';
   import 'package:sqflite/sqflite.dart';
   
   void main() async {
      var databasesPath = await getDatabasesPath();
      var path = join(databasesPath, "dog.db");
   
      await deleteDatabase(path);
   
   
      ByteData data = await rootBundle.load(join("assets", "dogdb.db"));
      List<int> bytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
      await new File(path).writeAsBytes(bytes);
   
   
      final database = openDatabase(
        path
       );
   
     Future<void> insertDog(Dog dog) async {
   
         final Database db = await database;
   
        await db.insert(
         'dogs',
          dog.toMap(),
          conflictAlgorithm: ConflictAlgorithm.replace,
        );
     }
   
    Future<List<Dog>> dogs() async {
   
       final Database db = await database;
   
       final List<Map<String, dynamic>> maps = await db.query('dogs');
   
       return List.generate(maps.length, (i) {
           return Dog(
              id: maps[i]['id'],
              name: maps[i]['name'],
              age: maps[i]['age'],
             );
           });
       }
   
      Future<void> updateDog(Dog dog) async {
   
        final db = await database;
   
        await db.update(
             'dogs',
             dog.toMap(),
             where: "id = ?",
             whereArgs: [dog.id],
           );
        }
   
        Future<void> deleteDog(int id) async {
           final db = await database;
   
            await db.delete(
           'dogs',
           where: "id = ?",
           whereArgs: [id],
          );
       }
   
        var fido = Dog(
         id: 0,
         name: 'Fido',
         age: 35,
       );
   
     await insertDog(fido);
   
     print(await dogs());
   
     fido = Dog(
       id: fido.id,
       name: fido.name,
       age: fido.age + 7,
     );
     await updateDog(fido);
   
     print(await dogs());
   
     await deleteDog(fido.id);
   
      print(await dogs());
   
     var dido = Dog(
         id: 4,
         name: 'Dido',
         age: 10,
        );
   
     await insertDog(dido);
   
     print(await dogs());
   
   }
   
   class Dog {
       final int id;
       final String name;
       final int age;
   
       Dog({this.id, this.name, this.age});
   
       Map<String, dynamic> toMap() {
         return {
            'id': id,
            'name': name,
            'age': age,
         };
      }
   
      @override
      String toString() {
          return 'Dog{id: $id, name: $name, age: $age}';
          }
     }