Add recordings

The tables ensembles, roles, recordings and performances as well as
corresponding queries and update logic have been added to the database.

lib/database.dart

@@ -30,11 +30,10 @@ class Database extends _$Database {
   int get schemaVersion => 1;
 
   @override
-  MigrationStrategy get migration => MigrationStrategy(
+  MigrationStrategy get migration =>
-    beforeOpen: (details) async {
+      MigrationStrategy(beforeOpen: (details) async {
-      await customStatement('PRAGMA foreign_keys = ON');
+        await customStatement('PRAGMA foreign_keys = ON');
-    }
+      });
-  );
 
   // TODO: Remove this once https://github.com/simolus3/moor/issues/453 is fixed.
   Selectable<Work> worksByComposer(int id) {
@@ -74,4 +73,23 @@ class Database extends _$Database {
       }
     });
   }
+
+  Future<void> updateEnsemble(Ensemble ensemble) async {
+    await into(ensembles).insert(ensemble, orReplace: true);
+  }
+
+  Future<void> updateRole(Role role) async {
+    await into(roles).insert(role, orReplace: true);
+  }
+
+  Future<void> updateRecording(
+      Recording recording, List<Performance> perfs) async {
+    await transaction(() async {
+      await (delete(performances)..where((p) => p.recording.equals(recording.id))).go();
+      await into(recordings).insert(recording, orReplace: true);
+      for (final perf in perfs) {
+        await into(performances).insert(perf);
+      }
+    });
+  }
 }

lib/database.moor

@@ -23,6 +23,28 @@ CREATE TABLE instrumentations (
     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 roles (
+    id INTEGER NOT NULL PRIMARY KEY,
+    name TEXT NOT NULL
+);
+
+CREATE TABLE recordings (
+    id INTEGER NOT NULL PRIMARY KEY,
+    work INTEGER REFERENCES works(id)
+);
+
+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 roles(id)
+);
+
 allPersons:
 SELECT * FROM persons ORDER BY last_name;
 
@@ -50,3 +72,24 @@ 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;
+
+allRoles:
+SELECT * FROM roles ORDER BY name;
+
+roleById:
+SELECT * FROM roles 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;