131 lines
3.4 KiB
Dart
131 lines
3.4 KiB
Dart
import 'dart:developer' as dev;
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import 'package:sqflite/sqflite.dart';
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import 'package:path/path.dart';
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/// 数据库服务：管理电池数据持久化
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class DatabaseService {
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static Database? _database;
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static const String _tableName = 'battery_data';
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/// 获取数据库实例（单例）
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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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return _database!;
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}
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/// 初始化数据库
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Future<Database> _initDatabase() async {
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final dbPath = await getDatabasesPath();
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final path = join(dbPath, 'battery_health.db');
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return await openDatabase(
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path,
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version: 1,
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onCreate: (db, version) async {
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await db.execute('''
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CREATE TABLE $_tableName (
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date TEXT PRIMARY KEY,
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capacity INTEGER NOT NULL,
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volt_max REAL NOT NULL,
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volt_min REAL NOT NULL,
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updated_at TEXT NOT NULL
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)
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''');
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await db.execute('''
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CREATE INDEX idx_date ON $_tableName (date DESC)
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''');
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dev.log('✅ 数据库表创建成功', name: 'DatabaseService');
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},
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);
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}
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/// 插入或更新数据
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Future<void> insertOrUpdate(
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String date,
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int capacity,
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double voltMax,
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double voltMin,
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) async {
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final db = await database;
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final now = DateTime.now().toIso8601String();
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await db.insert(_tableName, {
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'date': date,
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'capacity': capacity,
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'volt_max': voltMax,
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'volt_min': voltMin,
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'updated_at': now,
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}, conflictAlgorithm: ConflictAlgorithm.replace);
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dev.log('📝 数据已保存: $date, cap=$capacity', name: 'DatabaseService');
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}
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/// 查询最近 N 条数据（按日期倒序）
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Future<List<Map<String, dynamic>>> queryRecentData(int limit) async {
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final db = await database;
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try {
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final result = await db.query(
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_tableName,
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orderBy: 'date DESC',
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limit: limit,
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);
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return result;
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} catch (e) {
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dev.log('⚠️ 查询数据失败: $e', name: 'DatabaseService');
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return [];
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}
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}
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/// 查询指定日期数据
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Future<Map<String, dynamic>?> queryByDate(String date) async {
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final db = await database;
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try {
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final result = await db.query(
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_tableName,
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where: 'date = ?',
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whereArgs: [date],
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);
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return result.isNotEmpty ? result.first : null;
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} catch (e) {
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dev.log('⚠️ 查询单日数据失败: $e', name: 'DatabaseService');
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return null;
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}
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}
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/// 删除指定日期数据
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Future<void> deleteByDate(String date) async {
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final db = await database;
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await db.delete(_tableName, where: 'date = ?', whereArgs: [date]);
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}
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/// 获取数据库中所有日期列表
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Future<List<String>> getAllDates() async {
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final db = await database;
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try {
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final result = await db.query(
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_tableName,
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columns: ['date'],
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orderBy: 'date DESC',
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);
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return result.map((row) => row['date'] as String).toList();
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} catch (e) {
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return [];
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}
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}
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/// 清空所有数据
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Future<void> clearAll() async {
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final db = await database;
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await db.delete(_tableName);
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dev.log('🗑️ 所有数据已清空', name: 'DatabaseService');
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}
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/// 关闭数据库
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Future<void> close() async {
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if (_database != null) {
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await _database!.close();
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_database = null;
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}
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}
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}
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