Move database to seperate package

database/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# VS Code related
+.vscode/
+
+# Flutter/Dart/Pub related
+**/*.g.dart
+**/doc/api/
+.dart_tool/
+pubspec.lock
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/

database/build.yaml

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+targets:
+  $default:
+    builders:
+      moor_generator:
+        options:
+          generate_connect_constructor: true

database/lib/musicus_database.dart

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+export 'src/database.dart';

database/lib/src/database.dart

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+import 'dart:math';
+
+import 'package:moor/moor.dart';
+
+part 'database.g.dart';
+
+final _random = Random(DateTime.now().millisecondsSinceEpoch);
+int generateId() => _random.nextInt(0xFFFFFFFF);
+
+class WorkModel {
+  final Work work;
+  final List<int> instrumentIds;
+
+  WorkModel({
+    @required this.work,
+    @required this.instrumentIds,
+  });
+}
+
+class PerformanceModel {
+  final Person person;
+  final Ensemble ensemble;
+  final Instrument role;
+
+  PerformanceModel({
+    this.person,
+    this.ensemble,
+    this.role,
+  });
+}
+
+@UseMoor(
+  include: {
+    'database.moor',
+  },
+)
+class Database extends _$Database {  
+  Database.connect(DatabaseConnection connection) : super.connect(connection);
+
+  @override
+  int get schemaVersion => 1;
+
+  @override
+  MigrationStrategy get migration => MigrationStrategy(
+        beforeOpen: (details) async {
+          await customStatement('PRAGMA foreign_keys = ON');
+        },
+      );
+
+  Future<void> updatePerson(Person person) async {
+    await into(persons).insert(person, orReplace: true);
+  }
+
+  Future<void> updateInstrument(Instrument instrument) async {
+    await into(instruments).insert(instrument, orReplace: true);
+  }
+
+  Future<void> updateWork(WorkModel model, List<WorkModel> parts) async {
+    await transaction(() async {
+      final workId = model.work.id;
+      await (delete(works)..where((w) => w.id.equals(workId))).go();
+      await (delete(works)..where((w) => w.partOf.equals(workId))).go();
+
+      Future<void> insertWork(WorkModel model) async {
+        await into(works).insert(model.work);
+        await batch((b) => b.insertAll(
+            instrumentations,
+            model.instrumentIds
+                .map((id) =>
+                    Instrumentation(work: model.work.id, instrument: id))
+                .toList()));
+      }
+
+      await insertWork(model);
+      for (final part in parts) {
+        await insertWork(part);
+      }
+    });
+  }
+
+  Future<void> updateEnsemble(Ensemble ensemble) async {
+    await into(ensembles).insert(ensemble, orReplace: true);
+  }
+
+  Future<void> updateRecording(
+      Recording recording, List<PerformanceModel> models) async {
+    await transaction(() async {
+      await (delete(performances)
+            ..where((p) => p.recording.equals(recording.id)))
+          .go();
+      await into(recordings).insert(recording, orReplace: true);
+      for (final model in models) {
+        await into(performances).insert(Performance(
+          recording: recording.id,
+          person: model.person?.id,
+          ensemble: model.ensemble?.id,
+          role: model.role?.id,
+        ));
+      }
+    });
+  }
+}

database/lib/src/database.moor

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+CREATE TABLE persons (
+    id INTEGER NOT NULL PRIMARY KEY,
+    first_name TEXT NOT NULL,
+    last_name TEXT NOT NULL
+);
+
+-- This represents real instruments as well as other roles that can be played
+-- in a recording.
+CREATE TABLE instruments (
+    id INTEGER NOT NULL PRIMARY KEY,
+    name TEXT NOT NULL
+);
+
+CREATE TABLE works (
+    id INTEGER NOT NULL PRIMARY KEY,
+    composer INTEGER REFERENCES persons(id),
+    title TEXT NOT NULL,
+    part_of INTEGER REFERENCES works(id) ON DELETE CASCADE,
+    part_index INTEGER
+);
+
+CREATE TABLE instrumentations (
+    work INTEGER NOT NULL REFERENCES works(id) ON DELETE CASCADE,
+    instrument INTEGER NOT NULL REFERENCES instruments(id) ON DELETE CASCADE
+);
+
+CREATE TABLE ensembles (
+    id INTEGER NOT NULL PRIMARY KEY,
+    name TEXT NOT NULL
+);
+
+CREATE TABLE recordings (
+    id INTEGER NOT NULL PRIMARY KEY,
+    work INTEGER REFERENCES works(id),
+    comment TEXT NOT NULL
+);
+
+CREATE TABLE performances (
+    recording INTEGER NOT NULL REFERENCES recordings(id) ON DELETE CASCADE,
+    person INTEGER REFERENCES persons(id) ON DELETE CASCADE,
+    ensemble INTEGER REFERENCES ensembles(id) ON DELETE CASCADE,
+    role INTEGER REFERENCES instruments(id)
+);
+
+allPersons:
+SELECT * FROM persons ORDER BY last_name;
+
+personById:
+SELECT * FROM persons WHERE id = :id LIMIT 1;
+
+allInstruments:
+SELECT * FROM instruments ORDER BY name;
+
+instrumentById:
+SELECT * FROM instruments WHERE id = :id LIMIT 1;
+
+workById:
+SELECT * FROM works WHERE id = :id LIMIT 1;
+
+workParts:
+SELECT * FROM works WHERE part_of = :id ORDER BY part_index;
+
+-- TODO: Maybe optimize.
+worksByComposer:
+SELECT DISTINCT A.* FROM works A LEFT JOIN works B ON A.id = B.part_of
+    WHERE A.part_of IS NULL AND A.composer = :id OR B.composer = :id;
+
+composersByWork:
+SELECT DISTINCT persons.* FROM persons
+    JOIN works ON works.composer = persons.id
+    WHERE works.id = :id OR works.part_of = :id;
+
+instrumentsByWork:
+SELECT instruments.* FROM instrumentations
+    JOIN instruments ON instrumentations.instrument=instruments.id
+    WHERE instrumentations.work = :workId;
+
+allEnsembles:
+SELECT * FROM ensembles ORDER BY name;
+
+ensembleById:
+SELECT * FROM ensembles WHERE id = :id LIMIT 1;
+
+recordingById:
+SELECT * FROM recordings WHERE id = :id;
+
+recordingsByWork:
+SELECT * FROM recordings WHERE work = :id;
+
+performancesByRecording:
+SELECT * FROM performances WHERE recording = :id;

database/pubspec.yaml

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+name: musicus_database
+description: A database for classical music.
+version: 0.0.1
+
+environment:
+  sdk: ">=2.3.0 <3.0.0"
+
+dependencies:
+  moor:
+  moor_ffi:
+
+dev_dependencies:
+  build_runner:
+  moor_generator: