blob: 0b2cf7a8a1d4e669dd7f7cde89dc3377318b3349 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
import 'dart:io';
import 'dart:async';
import 'package:path_provider/path_provider.dart';
import 'package:sqlite3/sqlite3.dart';
import 'package:path/path.dart' as p;
class DB {
final Completer<Database?> _dbCompleter = Completer<Database?>();
static const List<String> migrations = <String>[
'''
PRAGMA user_version = 1;
CREATE TABLE "key_value" (
"key" TEXT NOT NULL UNIQUE,
"value" TEXT,
PRIMARY KEY("key")
);
''',
];
Future<void> connect() async {
String path = await _getDbPath();
Database candidate = sqlite3.open(path);
migrate(candidate);
_dbCompleter.complete(candidate);
}
void dispose() async {
if (_dbCompleter.isCompleted == false) {
return;
}
Database? db = await _dbCompleter.future;
if (db == null) return;
db.close();
}
static Future<String> _getDbPath() async {
Directory supportDir = await getApplicationSupportDirectory();
return p.join(supportDir.path, 'main.sqlite3');
}
static void migrate(Database db) {
for (int i=0; i<migrations.length; i++) {
int? userVersion = _getUserVersion(db);
if (userVersion == null) return;
if (i == userVersion) {
db.execute(migrations[i]);
}
}
}
static int? _getUserVersion(Database db) {
ResultSet result = db.select('PRAGMA user_version;');
if (result.length != 1) return null;
return result.first.values.first as int;
}
Future<String?> getServerFqdn() async {
Database? db = await _dbCompleter.future;
if (db == null) return null;
ResultSet result = db.select(
'SELECT value FROM key_value WHERE key = \'server_fqdn\';'
);
if (result.length != 1) return null;
return result[0]['value'];
}
Future<void> setServerFqdn(String value) async {
Database? db = await _dbCompleter.future;
if (db == null) return;
String? current = await getServerFqdn();
if (current == null) {
db.execute(
'INSERT INTO key_value (key, value) VALUES (\'server_fqdn\', ?);',
<Object?>[value],
);
} else {
db.execute(
'UPDATE key_value SET value = ? WHERE key = \'server_fqdn\';',
<Object?>[value],
);
}
}
}
|
