如何在SQFlite中插入POJO对象和列表

Question

我正在尝试将API中的数据存储到sqflite，但是我必须插入Objects和Lists，但是在此过程中，出现此错误：

ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: DatabaseException(java.lang.String cannot be cast to java.lang.Integer) sql 'INSERT INTO articleTable (id, created_on, title, summary, details, tags, featured_image, author, category) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)' args [21, 2020-04-14 04:04:57, Singer Jose ...]

这是模型Article类：

@JsonSerializable(explicitToJson: true)
class Article 
  Article(this.id, this.created_on, this.title, this.details,
      this.featured_image, this.author, this.category, this.summary, this.tags);

  int id;
  String created_on;
  String title;
  String summary;
  String details;
  List<String> tags;
  String featured_image;
  Author author;
  Category category;

  factory Article.fromJson(Map<String, dynamic> json) =>
      _$ArticleFromJson(json);

  Map<String, dynamic> toJson() => _$ArticleToJson(this);

Article模型类的自动生成的文件：

/ GENERATED CODE - DO NOT MODIFY BY HAND

part of 'article.dart';

// **************************************************************************
// JsonSerializableGenerator
// **************************************************************************

Article _$ArticleFromJson(Map<String, dynamic> json) 
  return Article(
    json['id'] as int,
    json['created_on'] as String,
    json['title'] as String,
    json['details'] as String,
    json['featured_image'] as String,
    json['author'] == null
        ? null
        : Author.fromJson(json['author'] as Map<String, dynamic>),
    json['category'] == null
        ? null
        : Category.fromJson(json['category'] as Map<String, dynamic>),
    json['summary'] as String,
    (json['tags'] as List)?.map((e) => e as String)?.toList(),
  );


Map<String, dynamic> _$ArticleToJson(Article instance) => <String, dynamic>
      'id': instance.id,
      'created_on': instance.created_on,
      'title': instance.title,
      'summary': instance.summary,
      'details': instance.details,
      'tags': instance.tags,
      'featured_image': instance.featured_image,
      'author': instance.author?.toJson(),
      'category': instance.category?.toJson(),
    ;

这是我在进行Sqflite插入的地方：

class ArticleApiProvider 
  Future<List<Article>> fetchArticles() async 
    final response =
        await http.get('https://api.xyxyxyxy');

    if (response.statusCode == 200) 
      List jsonResponse = jsonDecode(response.body);
      return jsonResponse.map((article) 
        articleBloc.addArticles(Article.fromJson(article));
      ).toList();
     else 
      throw Exception('Failed to retrieve articles');

我的[[Bloc类别：

class ArticleBloc final _repository = Repository(); final _articleFetcher = PublishSubject<List<Article>>(); Stream<List<Article>> get allArticles => _articleFetcher.stream; fetchArticles() async List<Article> articles = await _repository.fetchArticles(); _articleFetcher.sink.add(articles); getArticlesCached() async // sink is a way of adding data reactively to the stream // by registering a new event _articleFetcher.sink.add(await _repository.getAllArticles()); void addArticles(Article article) async await _repository.insertArticle(article); dispose() _articleFetcher.close(); final articleBloc = ArticleBloc();
这是
DatabaseProvider
类final articlesTable = "articleTable"; class DatabaseProvider static final DatabaseProvider dbProvider = DatabaseProvider(); Database _database; String id = "id"; String createdOn = "created_on"; String title = "title"; String summary = "summary"; String details = "details"; String featuredImage = "featured_image"; String author = "author"; String category = "category"; String tags = "tags"; Future<Database> get database async if (_database != null) return _database; _database = await createDatabase(); return _database; createDatabase() async Directory documentsDirectory = await getApplicationDocumentsDirectory(); // NewVision.db is our database instance name String path = join(documentsDirectory.path, "NewVision.db"); var database = await openDatabase(path, version: 1, onCreate: initDB, onUpgrade: onUpgrade); return database; void initDB(Database db, int version) async await db.execute( 'CREATE TABLE $articlesTable($id INTEGER PRIMARY KEY AUTOINCREMENT, $createdOn TEXT, $title TEXT ,' ' $summary TEXT , $details TEXT , ' '$tags TEXT, $featuredImage TEXT , $author TEXT , $category TEXT )'); void onUpgrade(Database db, int oldVersion, int newVersion) if (newVersion > oldVersion) String join(String path, String s) return path + s;
[其余文件的确遵循Bloc架构，为了使问题更精确，我想从提供的内容中可以得到一些帮助。
感谢您的帮助。