first commit

lib/database.dart

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+import 'package:drift/drift.dart';
+import 'dart:io';
+
+import 'package:drift/native.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:path/path.dart' as p;
+import 'package:sqlite3/sqlite3.dart';
+import 'package:sqlite3_flutter_libs/sqlite3_flutter_libs.dart';
+
+part 'database.g.dart';
+
+class Wolle extends Table {
+  IntColumn get id => integer().autoIncrement()();
+  TextColumn get manufacture => text()();
+  TextColumn get title => text()();
+  TextColumn get color => text().withLength(min: 7, max: 7)();
+}
+
+class TempRange extends Table {
+  IntColumn get id => integer().autoIncrement()();
+  RealColumn get min => real()();
+  RealColumn get max => real()();
+  IntColumn get wolle => integer().references(Wolle, #id)();
+}
+
+@DriftDatabase(tables: [Wolle, TempRange])
+class AppDatabase extends _$AppDatabase {
+  AppDatabase() : super(_openConnection());
+
+  @override
+  int get schemaVersion => 1;
+}
+
+LazyDatabase _openConnection() {
+  // the LazyDatabase util lets us find the right location for the file async.
+  return LazyDatabase(() async {
+    // put the database file, called db.sqlite here, into the documents folder
+    // for your app.
+    final dbFolder = await getApplicationDocumentsDirectory();
+    final file = File(p.join(dbFolder.path, 'db.sqlite'));
+
+    // Also work around limitations on old Android versions
+    if (Platform.isAndroid) {
+      await applyWorkaroundToOpenSqlite3OnOldAndroidVersions();
+    }
+
+    // Make sqlite3 pick a more suitable location for temporary files - the
+    // one from the system may be inaccessible due to sandboxing.
+    final cachebase = (await getTemporaryDirectory()).path;
+    // We can't access /tmp on Android, which sqlite3 would try by default.
+    // Explicitly tell it about the correct temporary directory.
+    sqlite3.tempDirectory = cachebase;
+
+    return NativeDatabase.createInBackground(file);
+  });
+}