90c1d5238b
- 新增数据库相关代码，包括数据库帮助类和操作函数 - 重构添加物品页面，增加表单验证和数据提交逻辑 - 新增物品列表页面，实现数据加载和展示功能 - 更新项目配置，添加必要的依赖库
47 lines
1.2 KiB
Dart
47 lines
1.2 KiB
Dart
import 'package:sqflite/sqflite.dart';
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import 'package:path/path.dart';
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import 'package:path_provider/path_provider.dart';
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class DatabaseHelper {
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static final _databaseName = "my_database.db";
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static final _databaseVersion = 1;
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static final table = 'items';
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static final columnId = '_id';
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static final columnName = 'name';
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static final columnContext = 'context';
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static final DatabaseHelper _instance = DatabaseHelper._internal();
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factory DatabaseHelper() => _instance;
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static Database? _database;
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DatabaseHelper._internal();
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Future<Database> get database async {
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if (_database != null) return _database!;
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_database = await _initDatabase();
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print('初始化成功！');
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return _database!;
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}
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Future<Database> _initDatabase() async {
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final directory = await getApplicationDocumentsDirectory();
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final path = join(directory.path, _databaseName);
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print('${path}');
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return await openDatabase(
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path,
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version: _databaseVersion,
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onCreate: _onCreate,
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);
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}
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Future<void> _onCreate(Database db, int version) async {
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await db.execute('''
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CREATE TABLE $table (
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$columnId INTEGER PRIMARY KEY,
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$columnName TEXT NOT NULL,
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$columnContext
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)
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''');
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}
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} |