113 lines
2.7 KiB
Dart
113 lines
2.7 KiB
Dart
import 'dart:convert';
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import 'package:sqflite/sqflite.dart';
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import 'package:lbjconsole/models/map_state.dart';
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import 'database_service.dart';
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class MapStateService {
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static final MapStateService instance = MapStateService._internal();
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factory MapStateService() => instance;
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MapStateService._internal();
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static const String _tableName = 'record_map_states';
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final Map<String, MapState> _memoryCache = {};
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Future<void> _ensureTableExists() async {
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final db = await DatabaseService.instance.database;
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await db.execute('''
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CREATE TABLE IF NOT EXISTS $_tableName (
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key TEXT PRIMARY KEY,
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state TEXT NOT NULL,
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updated_at INTEGER NOT NULL
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)
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''');
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}
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String getSingleRecordMapKey(String recordId) {
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return "${recordId}_record_map";
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}
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String getMergedRecordMapKey(String groupKey) {
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return "${groupKey}_group_map";
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}
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Future<void> saveMapState(String key, MapState state) async {
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try {
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_memoryCache[key] = state;
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final db = await DatabaseService.instance.database;
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await _ensureTableExists();
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await db.insert(
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_tableName,
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{
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'key': key,
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'state': jsonEncode(state.toJson()),
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'updated_at': DateTime.now().millisecondsSinceEpoch,
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},
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conflictAlgorithm: ConflictAlgorithm.replace,
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);
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} catch (e) {
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print('保存地图状态失败: $e');
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}
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}
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Future<MapState?> getMapState(String key) async {
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if (_memoryCache.containsKey(key)) {
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return _memoryCache[key];
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}
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try {
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final db = await DatabaseService.instance.database;
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await _ensureTableExists();
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final result = await db.query(
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_tableName,
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where: 'key = ?',
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whereArgs: [key],
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limit: 1,
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);
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if (result.isNotEmpty) {
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final stateJson = jsonDecode(result.first['state'] as String);
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final state = MapState.fromJson(stateJson);
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_memoryCache[key] = state;
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return state;
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}
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} catch (e) {
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print('读取地图状态失败: $e');
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}
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return null;
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}
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Future<void> deleteMapState(String key) async {
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_memoryCache.remove(key);
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try {
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final db = await DatabaseService.instance.database;
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await db.delete(
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_tableName,
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where: 'key = ?',
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whereArgs: [key],
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);
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} catch (e) {
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print('删除地图状态失败: $e');
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}
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}
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Future<void> clearAllMapStates() async {
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_memoryCache.clear();
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try {
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final db = await DatabaseService.instance.database;
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await db.delete(_tableName);
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} catch (e) {
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print('清空地图状态失败: $e');
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}
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}
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void clearMemoryCache() {
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_memoryCache.clear();
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}
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} |