database: Add pagination and searching

This also unifies the method names.

database/lib/src/database.dart

@@ -15,6 +15,8 @@ int generateId() => _random.nextInt(0xFFFFFFFF);
   },
 )
 class Database extends _$Database {
+  static const pageSize = 25;
+
   Database(QueryExecutor queryExecutor) : super(queryExecutor);
 
   Database.connect(DatabaseConnection connection) : super.connect(connection);
@@ -29,10 +31,50 @@ class Database extends _$Database {
         },
       );
 
+  /// Get all available persons.
+  ///
+  /// This will return a list of [pageSize] persons. You can get another page
+  /// using the [page] parameter. If a non empty [search] string is provided,
+  /// the persons will get filtered based on that string.
+  Future<List<Person>> getPersons([int page = 0, String search]) async {
+    assert(page != null);
+
+    final offset = page * pageSize;
+    List<Person> result;
+
+    if (search == null || search.isEmpty) {
+      result = await allPersons(pageSize, offset).get();
+    } else {
+      result = await searchPersons('$search%', pageSize, offset).get();
+    }
+
+    return result;
+  }
+
   Future<void> updatePerson(Person person) async {
     await into(persons).insert(person, orReplace: true);
   }
 
+  /// Get all available instruments.
+  ///
+  /// This will return a list of [pageSize] instruments. You can get another
+  /// page using the [page] parameter. If a non empty [search] string is
+  /// provided, the instruments will get filtered based on that string.
+  Future<List<Instrument>> getInstruments([int page = 0, String search]) async {
+    assert(page != null);
+
+    final offset = page * pageSize;
+    List<Instrument> result;
+
+    if (search == null || search.isEmpty) {
+      result = await allInstruments(pageSize, offset).get();
+    } else {
+      result = await searchInstruments('$search%', pageSize, offset).get();
+    }
+
+    return result;
+  }
+
   Future<void> updateInstrument(Instrument instrument) async {
     await into(instruments).insert(instrument, orReplace: true);
   }
@@ -70,8 +112,24 @@ class Database extends _$Database {
   }
 
   /// Get information on all works written by the person with ID [personId].
-  Future<List<WorkInfo>> getWorks(int personId) async {
-    final works = await worksByComposer(personId).get();
+  ///
+  /// This will return a list of [pageSize] results. You can get another page
+  /// using the [page] parameter. If a non empty [search] string is provided,
+  /// the works will be filtered using that string.
+  Future<List<WorkInfo>> getWorks(int personId,
+      [int page = 0, String search]) async {
+    assert(page != null);
+
+    final offset = page * pageSize;
+    List<Work> works;
+
+    if (search == null || search.isEmpty) {
+      works = await worksByComposer(personId, pageSize, offset).get();
+    } else {
+      works =
+          await searchWorksByComposer(personId, '$search%', pageSize, offset)
+              .get();
+    }
 
     final List<WorkInfo> result = [];
     for (final work in works) {
@@ -123,6 +181,26 @@ class Database extends _$Database {
     });
   }
 
+  /// Get all available ensembles.
+  ///
+  /// This will return a list of [pageSize] ensembles. You can get another page
+  /// using the [page] parameter. If a non empty [search] string is provided,
+  /// the ensembles will get filtered based on that string.
+  Future<List<Ensemble>> getEnsembles([int page = 0, String search]) async {
+    assert(page != null);
+
+    final offset = page * pageSize;
+    List<Ensemble> result;
+
+    if (search == null || search.isEmpty) {
+      result = await allEnsembles(pageSize, offset).get();
+    } else {
+      result = await searchEnsembles('$search%', pageSize, offset).get();
+    }
+
+    return result;
+  }
+
   Future<void> updateEnsemble(Ensemble ensemble) async {
     await into(ensembles).insert(ensemble, orReplace: true);
   }
@@ -195,8 +273,14 @@ class Database extends _$Database {
   }
 
   /// Get information on all recordings of the work with ID [workId].
-  Future<List<RecordingInfo>> getRecordings(int workId) async {
-    final recordings = await recordingsByWork(workId).get();
+  ///
+  /// This will return a list of [pageSize] recordings. You can get the other
+  /// pages using the [page] parameter.
+  Future<List<RecordingInfo>> getRecordings(int workId, [int page = 0]) async {
+    assert(page != null);
+
+    final offset = page * pageSize;
+    final recordings = await recordingsByWork(workId, pageSize, offset).get();
 
     final List<RecordingInfo> result = [];
     for (final recording in recordings) {

database/lib/src/database.moor

@@ -43,13 +43,22 @@ CREATE TABLE performances (
 );
 
 allPersons:
-SELECT * FROM persons ORDER BY last_name;
+SELECT * FROM persons ORDER BY last_name, first_name
+    LIMIT :limit OFFSET :offset;
+
+searchPersons:
+SELECT * FROM persons WHERE last_name LIKE :search
+    ORDER BY last_name, first_name LIMIT :limit OFFSET :offset;
 
 personById:
 SELECT * FROM persons WHERE id = :id LIMIT 1;
 
 allInstruments:
-SELECT * FROM instruments ORDER BY name;
+SELECT * FROM instruments ORDER BY name LIMIT :limit OFFSET :offset;
+
+searchInstruments:
+SELECT * FROM instruments WHERE name LIKE :search ORDER BY name
+    LIMIT :limit OFFSET :offset;
 
 instrumentById:
 SELECT * FROM instruments WHERE id = :id LIMIT 1;
@@ -60,10 +69,15 @@ 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;
+    WHERE (A.part_of IS NULL AND A.composer = :id) OR B.composer = :id
+    ORDER BY A.title LIMIT :limit OFFSET :offset;
+
+searchWorksByComposer:
+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)
+    AND A.title LIKE :search ORDER BY A.title LIMIT :limit OFFSET :offset;
 
 composersByWork:
 SELECT DISTINCT persons.* FROM persons
@@ -76,7 +90,11 @@ SELECT instruments.* FROM instrumentations
     WHERE instrumentations.work = :workId;
 
 allEnsembles:
-SELECT * FROM ensembles ORDER BY name;
+SELECT * FROM ensembles ORDER BY name LIMIT :limit OFFSET :offset;
+
+searchEnsembles:
+SELECT * FROM ensembles WHERE name LIKE :search ORDER BY name
+    LIMIT :limit OFFSET :offset;
 
 ensembleById:
 SELECT * FROM ensembles WHERE id = :id LIMIT 1;
@@ -85,7 +103,8 @@ recordingById:
 SELECT * FROM recordings WHERE id = :id;
 
 recordingsByWork:
-SELECT * FROM recordings WHERE work = :id;
+SELECT * FROM recordings WHERE work = :id ORDER BY id
+    LIMIT :limit OFFSET :offset;
 
 performancesByRecording:
 SELECT * FROM performances WHERE recording = :id;