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@ -1,27 +1,35 @@ |
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import 'package:get/get.dart'; |
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import 'package:sqflite/sqflite.dart'; |
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import 'package:sqflite/sqflite.dart'; |
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import 'package:path/path.dart'; |
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import 'package:path/path.dart'; |
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import 'package:uuid/uuid.dart'; |
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import 'package:uuid/uuid.dart'; |
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import '../models/problem_model.dart'; |
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import '../models/problem_model.dart'; |
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class LocalDatabase { |
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/// LocalDatabase 是一个 GetxService，它负责管理本地 SQLite 数据库。 |
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static final LocalDatabase _instance = LocalDatabase._internal(); |
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/// GetxService 确保这个类在整个应用生命周期中都是一个单例，并且不会被自动销毁。 |
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factory LocalDatabase() => _instance; |
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class LocalDatabase extends GetxService { |
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static Database? _database; |
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static const String _dbName = 'problems.db'; |
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static const String _tableName = 'problems'; |
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static const String _tableName = 'problems'; |
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LocalDatabase._internal(); |
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/// 私有的数据库实例，只能在 LocalDatabase 类内部访问。 |
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late Database _database; |
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Future<Database> get database async { |
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/// onInit 是 GetxService 的生命周期方法，在服务首次被创建时调用。 |
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if (_database != null) return _database!; |
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/// 它是执行异步初始化的最佳位置，确保在使用服务前，数据库已经准备就绪。 |
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_database = await _initDatabase(); |
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@override |
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return _database!; |
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void onInit() { |
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super.onInit(); |
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_initDatabase(); |
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} |
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} |
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Future<Database> _initDatabase() async { |
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/// 异步初始化数据库。它会打开数据库连接，如果数据库不存在则创建。 |
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String path = join(await getDatabasesPath(), 'problems.db'); |
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Future<void> _initDatabase() async { |
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return await openDatabase(path, version: 1, onCreate: _onCreate); |
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final databasePath = await getDatabasesPath(); |
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final path = join(databasePath, _dbName); |
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_database = await openDatabase(path, version: 1, onCreate: _onCreate); |
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} |
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} |
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/// 数据库创建时的回调函数，用于执行建表语句。 |
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Future<void> _onCreate(Database db, int version) async { |
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Future<void> _onCreate(Database db, int version) async { |
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await db.execute(''' |
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await db.execute(''' |
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CREATE TABLE $_tableName( |
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CREATE TABLE $_tableName( |
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@ -37,15 +45,17 @@ class LocalDatabase { |
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'''); |
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'''); |
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} |
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} |
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/// 插入一个新问题到数据库。在插入前，会为其生成一个唯一的 UUID。 |
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/// 返回插入的行数。 |
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Future<int> insertProblem(Problem problem) async { |
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Future<int> insertProblem(Problem problem) async { |
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final db = await database; |
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problem.id = const Uuid().v4(); |
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problem.id = const Uuid().v4(); |
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return await db.insert(_tableName, problem.toMap()); |
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return await _database.insert(_tableName, problem.toMap()); |
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} |
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} |
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/// 更新数据库中已存在的问题。 |
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/// 返回更新的行数。 |
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Future<int> updateProblem(Problem problem) async { |
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Future<int> updateProblem(Problem problem) async { |
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final db = await database; |
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return await _database.update( |
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return await db.update( |
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_tableName, |
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_tableName, |
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problem.toMap(), |
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problem.toMap(), |
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where: 'id = ?', |
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where: 'id = ?', |
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@ -53,48 +63,41 @@ class LocalDatabase { |
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); |
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); |
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} |
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} |
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/// 根据 ID 删除数据库中的问题。 |
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/// 返回删除的行数。 |
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Future<int> deleteProblem(String id) async { |
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Future<int> deleteProblem(String id) async { |
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final db = await database; |
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return await _database.delete(_tableName, where: 'id = ?', whereArgs: [id]); |
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return await db.delete(_tableName, where: 'id = ?', whereArgs: [id]); |
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} |
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} |
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/// 通用查询方法 |
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/// 通用查询方法，根据可选的筛选条件获取问题列表。 |
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/// 根据可选的参数筛选问题。 |
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/// - `startDate`/`endDate`：筛选创建时间范围。 |
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/// 时间范围、 |
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/// - `uploadStatus`：筛选上传状态（'已上传', '未上传', '全部'）。 |
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/// 上传状态 |
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/// - `bindStatus`：筛选绑定状态（'已绑定', '未绑定', '全部'）。 |
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/// 绑定状态 |
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Future<List<Problem>> getProblems({ |
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Future<List<Problem>> getProblems({ |
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DateTime? startDate, |
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DateTime? startDate, |
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DateTime? endDate, |
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DateTime? endDate, |
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String? uploadStatus, // '已上传', '未上传', '全部' |
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String uploadStatus = '全部', |
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String? bindStatus, // '已绑定', '未绑定', '全部' |
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String bindStatus = '全部', |
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}) async { |
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}) async { |
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final db = await database; |
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// 使用可变列表来构建筛选条件 |
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final List<String> whereClauses = []; |
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final List<String> whereClauses = []; |
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final List<dynamic> whereArgs = []; |
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final List<dynamic> whereArgs = []; |
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// 根据 startDate 添加筛选条件 |
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if (startDate != null) { |
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if (startDate != null) { |
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whereClauses.add('createdAt >= ?'); |
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whereClauses.add('createdAt >= ?'); |
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whereArgs.add(startDate.millisecondsSinceEpoch); |
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whereArgs.add(startDate.millisecondsSinceEpoch); |
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} |
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} |
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// 根据 endDate 添加筛选条件 |
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if (endDate != null) { |
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if (endDate != null) { |
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whereClauses.add('createdAt <= ?'); |
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whereClauses.add('createdAt <= ?'); |
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whereArgs.add(endDate.millisecondsSinceEpoch); |
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whereArgs.add(endDate.millisecondsSinceEpoch); |
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} |
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} |
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// 根据 uploadStatus 添加筛选条件 |
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if (uploadStatus != '全部') { |
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if (uploadStatus != null && uploadStatus != '全部') { |
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whereClauses.add('isUploaded = ?'); |
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whereClauses.add('isUploaded = ?'); |
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whereArgs.add(uploadStatus == '已上传' ? 1 : 0); |
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whereArgs.add(uploadStatus == '已上传' ? 1 : 0); |
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} |
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} |
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// 根据 bindStatus 添加筛选条件 |
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if (bindStatus != '全部') { |
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if (bindStatus != null && bindStatus != '全部') { |
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if (bindStatus == '已绑定') { |
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if (bindStatus == '已绑定') { |
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whereClauses.add('censorTaskId IS NOT NULL'); |
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whereClauses.add('censorTaskId IS NOT NULL'); |
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} else { |
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} else { |
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@ -102,10 +105,9 @@ class LocalDatabase { |
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} |
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} |
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} |
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} |
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// 将所有条件用 ' AND ' 连接起来 |
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final String whereString = whereClauses.join(' AND '); |
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final String whereString = whereClauses.join(' AND '); |
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final List<Map<String, dynamic>> maps = await db.query( |
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final List<Map<String, dynamic>> maps = await _database.query( |
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_tableName, |
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_tableName, |
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where: whereString.isEmpty ? null : whereString, |
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where: whereString.isEmpty ? null : whereString, |
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whereArgs: whereArgs.isEmpty ? null : whereArgs, |
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whereArgs: whereArgs.isEmpty ? null : whereArgs, |
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@ -116,4 +118,12 @@ class LocalDatabase { |
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return Problem.fromMap(maps[i]); |
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return Problem.fromMap(maps[i]); |
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}); |
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}); |
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} |
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} |
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/// onClose 是 GetxService 的生命周期方法，在服务被销毁前调用。 |
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/// 虽然 GetxService 默认是永久的，但养成关闭数据库连接的习惯是很好的实践。 |
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@override |
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void onClose() { |
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_database.close(); |
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super.onClose(); |
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} |
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} |
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} |
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