Schema tool: Store whether dates are text

drift_dev/lib/src/analyzer/options.dart

@@ -12,7 +12,7 @@ part 'options.g.dart';
   anyMap: true,
   disallowUnrecognizedKeys: true,
   fieldRename: FieldRename.snake,
-  createToJson: false,
+  createToJson: true,
 )
 class DriftOptions {
   static const _defaultSqliteVersion = SqliteVersion.v3(34);
@@ -191,6 +191,8 @@ class DriftOptions {
   SqliteVersion get sqliteVersion {
     return sqliteOptions?.version ?? _defaultSqliteVersion;
   }
+
+  Map<String, Object?> toJson() => _$DriftOptionsToJson(this);
 }
 
 @JsonSerializable()

drift_dev/lib/src/analyzer/options.g.dart

@@ -115,6 +115,36 @@ DriftOptions _$DriftOptionsFromJson(Map json) => $checkedCreate(
       },
     );
 
+Map<String, dynamic> _$DriftOptionsToJson(DriftOptions instance) =>
+    <String, dynamic>{
+      'write_from_json_string_constructor':
+          instance.generateFromJsonStringConstructor,
+      'override_hash_and_equals_in_result_sets':
+          instance.overrideHashAndEqualsInResultSets,
+      'compact_query_methods': instance.compactQueryMethods,
+      'skip_verification_code': instance.skipVerificationCode,
+      'use_data_class_name_for_companions':
+          instance.useDataClassNameForCompanions,
+      'use_column_name_as_json_key_when_defined_in_moor_file':
+          instance.useColumnNameAsJsonKeyWhenDefinedInMoorFile,
+      'generate_connect_constructor': instance.generateConnectConstructor,
+      'sqlite_modules':
+          instance.modules.map((e) => _$SqlModuleEnumMap[e]!).toList(),
+      'sqlite': instance.sqliteAnalysisOptions,
+      'sql': instance.dialect,
+      'eagerly_load_dart_ast': instance.eagerlyLoadDartAst,
+      'data_class_to_companions': instance.dataClassToCompanions,
+      'mutable_classes': instance.generateMutableClasses,
+      'raw_result_set_data': instance.rawResultSetData,
+      'apply_converters_on_variables': instance.applyConvertersOnVariables,
+      'generate_values_in_copy_with': instance.generateValuesInCopyWith,
+      'named_parameters': instance.generateNamedParameters,
+      'named_parameters_always_required':
+          instance.namedParametersAlwaysRequired,
+      'scoped_dart_components': instance.scopedDartComponents,
+      'store_date_time_values_as_text': instance.storeDateTimeValuesAsText,
+    };
+
 const _$SqlModuleEnumMap = {
   SqlModule.json1: 'json1',
   SqlModule.fts5: 'fts5',

drift_dev/lib/src/cli/commands/schema/dump.dart

@@ -50,7 +50,7 @@ class DumpSchemaCommand extends Command {
     }
 
     final db = result.declaredDatabases.single;
-    final writer = SchemaWriter(db);
+    final writer = SchemaWriter(db, options: cli.project.moorOptions);
 
     var target = rest[1];
     // This command is most commonly used to write into

drift_dev/lib/src/cli/commands/schema/generate_utils.dart

@@ -9,6 +9,8 @@ import 'package:drift_dev/src/services/schema/schema_files.dart';
 import 'package:drift_dev/writer.dart';
 import 'package:path/path.dart' as p;
 
+import '../../../analyzer/options.dart';
+
 class GenerateUtilsCommand extends Command {
   final MoorCli cli;
 
@@ -78,9 +80,8 @@ class GenerateUtilsCommand extends Command {
         'Wrote ${schema.length + 1} files into ${p.relative(outputDir.path)}');
   }
 
-  Future<Map<int, List<DriftSchemaEntity>>> _parseSchema(
-      Directory directory) async {
-    final results = <int, List<DriftSchemaEntity>>{};
+  Future<Map<int, _ExportedSchema>> _parseSchema(Directory directory) async {
+    final results = <int, _ExportedSchema>{};
 
     await for (final entity in directory.list()) {
       final basename = p.basename(entity.path);
@@ -92,7 +93,8 @@ class GenerateUtilsCommand extends Command {
       final rawData = json.decode(await entity.readAsString());
 
       final schema = SchemaReader.readJson(rawData as Map<String, dynamic>);
-      results[version] = schema.entities.toList();
+      results[version] =
+          _ExportedSchema(schema.entities.toList(), schema.options);
     }
 
     return results;
@@ -101,13 +103,20 @@ class GenerateUtilsCommand extends Command {
   Future<void> _writeSchemaFile(
     Directory output,
     int version,
-    List<DriftSchemaEntity> entities,
+    _ExportedSchema schema,
     bool dataClasses,
     bool companions,
     bool isForMoor,
   ) {
+    // let serialized options take precedence, otherwise use current options
+    // from project.
+    final options = DriftOptions.fromJson({
+      ...cli.project.moorOptions.toJson(),
+      ...schema.options,
+    });
+
     final writer = Writer(
-      cli.project.moorOptions,
+      options,
       generationOptions: GenerationOptions(
         forSchema: version,
         writeCompanions: companions,
@@ -131,7 +140,7 @@ class GenerateUtilsCommand extends Command {
       declaredQueries: const [],
       declaredIncludes: const [],
       declaredTables: const [],
-    )..entities = entities;
+    )..entities = schema.schema;
     DatabaseWriter(db, writer.child()).write();
 
     return file.writeAsString(_dartfmt.format(writer.writeGenerated()));
@@ -186,3 +195,10 @@ class GenerateUtilsCommand extends Command {
   static final _dartfmt = DartFormatter();
   static const _prefix = '// GENERATED CODE, DO NOT EDIT BY HAND.';
 }
+
+class _ExportedSchema {
+  final List<DriftSchemaEntity> schema;
+  final Map<String, Object?> options;
+
+  _ExportedSchema(this.schema, this.options);
+}

drift_dev/lib/src/services/schema/schema_files.dart

@@ -5,19 +5,19 @@ import 'package:sqlparser/sqlparser.dart';
 
 import '../../writer/utils/column_constraints.dart';
 
-const _infoVersion = '0.1.0-dev-preview';
+const _infoVersion = '1.0.0';
 
 /// Utilities to transform moor schema entities to json.
 class SchemaWriter {
-  static const _exportOptions = DriftOptions.defaults();
-
   /// The parsed and resolved database for which the schema should be written.
   final Database db;
 
+  final DriftOptions options;
+
   final Map<DriftSchemaEntity, int> _entityIds = {};
   int _maxId = 0;
 
-  SchemaWriter(this.db);
+  SchemaWriter(this.db, {this.options = const DriftOptions.defaults()});
 
   int _idOf(DriftSchemaEntity entity) {
     return _entityIds.putIfAbsent(entity, () => _maxId++);
@@ -27,15 +27,24 @@ class SchemaWriter {
     return {
       '_meta': {
         'description': 'This file contains a serialized version of schema '
-            'entities for moor.',
+            'entities for drift.',
         'version': _infoVersion,
       },
+      'options': _serializeOptions(),
       'entities': [
         for (final entity in db.entities) _entityToJson(entity),
       ],
     };
   }
 
+  Map _serializeOptions() {
+    const relevantKeys = {'store_date_time_values_as_text'};
+    final asJson = options.toJson()
+      ..removeWhere((key, _) => !relevantKeys.contains(key));
+
+    return asJson;
+  }
+
   Map _entityToJson(DriftSchemaEntity entity) {
     String type;
     Map data;
@@ -51,7 +60,7 @@ class SchemaWriter {
           for (final ref in entity.bodyReferences) _idOf(ref),
         ],
         'name': entity.displayName,
-        'sql': entity.createSql(_exportOptions),
+        'sql': entity.createSql(options),
       };
     } else if (entity is MoorIndex) {
       type = 'index';
@@ -160,6 +169,7 @@ class SchemaReader {
   final Set<int> _currentlyProcessing = {};
 
   final SqlEngine _engine = SqlEngine();
+  Map<String, Object?> options = const {};
 
   SchemaReader._();
 
@@ -170,6 +180,13 @@ class SchemaReader {
   Iterable<DriftSchemaEntity> get entities => _entitiesById.values;
 
   void _read(Map<String, dynamic> json) {
+    // Read drift options if they are part of the schema file.
+    final optionsInJson = json['options'] as Map<String, Object?>?;
+    options = optionsInJson ??
+        {
+          'store_date_time_values_as_text': false,
+        };
+
     final entities = json['entities'] as List<dynamic>;
 
     for (final raw in entities) {

drift_dev/test/services/schema/writer_test.dart

@@ -74,11 +74,19 @@ class Database {}
 
     final schemaJson = SchemaWriter(db).createSchemaJson();
     expect(schemaJson, json.decode(expected));
+
+    final schemaWithOptions = SchemaWriter(
+      db,
+      options: const DriftOptions.defaults(storeDateTimeValuesAsText: true),
+    ).createSchemaJson();
+    expect(
+        schemaWithOptions['options'], {'store_date_time_values_as_text': true});
   });
 
   test('can generate code from schema json', () {
-    final reader =
-        SchemaReader.readJson(json.decode(expected) as Map<String, dynamic>);
+    final serializedSchema = json.decode(expected) as Map<String, dynamic>;
+
+    final reader = SchemaReader.readJson(serializedSchema);
     final fakeDb = Database()..entities = [...reader.entities];
 
     // Write the database. Not crashing is good enough for us here, we have
@@ -92,8 +100,11 @@ class Database {}
 const expected = r'''
 {
     "_meta": {
-        "description": "This file contains a serialized version of schema entities for moor.",
-        "version": "0.1.0-dev-preview"
+        "description": "This file contains a serialized version of schema entities for drift.",
+        "version": "1.0.0"
+    },
+    "options": {
+      "store_date_time_values_as_text": false
     },
     "entities": [
         {

examples/migrations_example/build.yaml

@@ -4,3 +4,4 @@ targets:
       drift_dev:
         options:
           generate_connect_constructor: true
+          store_date_time_values_as_text: true

examples/migrations_example/drift_migrations/drift_schema_v6.json

@@ -0,0 +1 @@
+{"_meta":{"description":"This file contains a serialized version of schema entities for drift.","version":"1.0.0"},"options":{"store_date_time_values_as_text":true},"entities":[{"id":0,"references":[],"type":"table","data":{"name":"users","was_declared_in_moor":false,"columns":[{"name":"id","getter_name":"id","moor_type":"ColumnType.integer","nullable":false,"customConstraints":null,"defaultConstraints":"PRIMARY KEY AUTOINCREMENT","default_dart":null,"default_client_dart":null,"dsl_features":["auto-increment","primary-key"]},{"name":"name","getter_name":"name","moor_type":"ColumnType.text","nullable":false,"customConstraints":null,"default_dart":"const Constant('name')","default_client_dart":null,"dsl_features":[]},{"name":"birthday","getter_name":"birthday","moor_type":"ColumnType.datetime","nullable":true,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"next_user","getter_name":"nextUser","moor_type":"ColumnType.integer","nullable":true,"customConstraints":null,"defaultConstraints":"REFERENCES users (id)","default_dart":null,"default_client_dart":null,"dsl_features":["unknown"]}],"is_virtual":false}},{"id":1,"references":[0],"type":"table","data":{"name":"groups","was_declared_in_moor":true,"columns":[{"name":"id","getter_name":"id","moor_type":"ColumnType.integer","nullable":false,"customConstraints":"NOT NULL","default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"title","getter_name":"title","moor_type":"ColumnType.text","nullable":false,"customConstraints":"NOT NULL","default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"deleted","getter_name":"deleted","moor_type":"ColumnType.boolean","nullable":true,"customConstraints":"DEFAULT FALSE","default_dart":"const CustomExpression<bool>('FALSE')","default_client_dart":null,"dsl_features":[]},{"name":"owner","getter_name":"owner","moor_type":"ColumnType.integer","nullable":false,"customConstraints":"NOT NULL REFERENCES users (id)","default_dart":null,"default_client_dart":null,"dsl_features":[]}],"is_virtual":false,"constraints":["PRIMARY KEY (id)"],"explicit_pk":["id"]}},{"id":2,"references":[1,0],"type":"view","data":{"name":"group_count","sql":"CREATE VIEW group_count AS SELECT users.*, (SELECT COUNT(*) FROM \"groups\" WHERE owner = users.id) AS group_count FROM users","dart_data_name":"GroupCountData","dart_info_name":"GroupCount","columns":[{"name":"id","getter_name":"id","moor_type":"ColumnType.integer","nullable":false,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"name","getter_name":"name","moor_type":"ColumnType.text","nullable":false,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"birthday","getter_name":"birthday","moor_type":"ColumnType.datetime","nullable":true,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"next_user","getter_name":"nextUser","moor_type":"ColumnType.integer","nullable":true,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"group_count","getter_name":"groupCount","moor_type":"ColumnType.integer","nullable":false,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]}]}}]}

examples/migrations_example/lib/database.dart

@@ -9,7 +9,7 @@ part 'database.g.dart';
 @DriftDatabase(include: {'tables.drift'})
 class Database extends _$Database {
   @override
-  int get schemaVersion => 5;
+  int get schemaVersion => 6;
 
   Database(DatabaseConnection connection) : super.connect(connection);
 
@@ -47,6 +47,8 @@ class Database extends _$Database {
 
             // And create the view on users
             await m.createView(groupCount);
+          } else if (target == 6) {
+            await m.addColumn(users, users.birthday);
           }
         }
       },

examples/migrations_example/lib/database.g.dart

@@ -10,13 +10,18 @@ part of 'database.dart';
 class User extends DataClass implements Insertable<User> {
   final int id;
   final String name;
+  final DateTime? birthday;
   final int? nextUser;
-  const User({required this.id, required this.name, this.nextUser});
+  const User(
+      {required this.id, required this.name, this.birthday, this.nextUser});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};
     map['id'] = Variable<int>(id);
     map['name'] = Variable<String>(name);
+    if (!nullToAbsent || birthday != null) {
+      map['birthday'] = Variable<DateTime>(birthday);
+    }
     if (!nullToAbsent || nextUser != null) {
       map['next_user'] = Variable<int>(nextUser);
     }
@@ -27,6 +32,9 @@ class User extends DataClass implements Insertable<User> {
     return UsersCompanion(
       id: Value(id),
       name: Value(name),
+      birthday: birthday == null && nullToAbsent
+          ? const Value.absent()
+          : Value(birthday),
       nextUser: nextUser == null && nullToAbsent
           ? const Value.absent()
           : Value(nextUser),
@@ -39,6 +47,7 @@ class User extends DataClass implements Insertable<User> {
     return User(
       id: serializer.fromJson<int>(json['id']),
       name: serializer.fromJson<String>(json['name']),
+      birthday: serializer.fromJson<DateTime?>(json['birthday']),
       nextUser: serializer.fromJson<int?>(json['nextUser']),
     );
   }
@@ -48,13 +57,16 @@ class User extends DataClass implements Insertable<User> {
     return <String, dynamic>{
       'id': serializer.toJson<int>(id),
       'name': serializer.toJson<String>(name),
+      'birthday': serializer.toJson<DateTime?>(birthday),
       'nextUser': serializer.toJson<int?>(nextUser),
     };
   }
 
-  User copyWith({int? id, String? name, int? nextUser}) => User(
+  User copyWith({int? id, String? name, DateTime? birthday, int? nextUser}) =>
+      User(
         id: id ?? this.id,
         name: name ?? this.name,
+        birthday: birthday ?? this.birthday,
         nextUser: nextUser ?? this.nextUser,
       );
   @override
@@ -62,53 +74,64 @@ class User extends DataClass implements Insertable<User> {
     return (StringBuffer('User(')
           ..write('id: $id, ')
           ..write('name: $name, ')
+          ..write('birthday: $birthday, ')
           ..write('nextUser: $nextUser')
           ..write(')'))
         .toString();
   }
 
   @override
-  int get hashCode => Object.hash(id, name, nextUser);
+  int get hashCode => Object.hash(id, name, birthday, nextUser);
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
       (other is User &&
           other.id == this.id &&
           other.name == this.name &&
+          other.birthday == this.birthday &&
           other.nextUser == this.nextUser);
 }
 
 class UsersCompanion extends UpdateCompanion<User> {
   final Value<int> id;
   final Value<String> name;
+  final Value<DateTime?> birthday;
   final Value<int?> nextUser;
   const UsersCompanion({
     this.id = const Value.absent(),
     this.name = const Value.absent(),
+    this.birthday = const Value.absent(),
     this.nextUser = const Value.absent(),
   });
   UsersCompanion.insert({
     this.id = const Value.absent(),
     this.name = const Value.absent(),
+    this.birthday = const Value.absent(),
     this.nextUser = const Value.absent(),
   });
   static Insertable<User> custom({
     Expression<int>? id,
     Expression<String>? name,
+    Expression<DateTime>? birthday,
     Expression<int>? nextUser,
   }) {
     return RawValuesInsertable({
       if (id != null) 'id': id,
       if (name != null) 'name': name,
+      if (birthday != null) 'birthday': birthday,
       if (nextUser != null) 'next_user': nextUser,
     });
   }
 
   UsersCompanion copyWith(
-      {Value<int>? id, Value<String>? name, Value<int?>? nextUser}) {
+      {Value<int>? id,
+      Value<String>? name,
+      Value<DateTime?>? birthday,
+      Value<int?>? nextUser}) {
     return UsersCompanion(
       id: id ?? this.id,
       name: name ?? this.name,
+      birthday: birthday ?? this.birthday,
       nextUser: nextUser ?? this.nextUser,
     );
   }
@@ -122,6 +145,9 @@ class UsersCompanion extends UpdateCompanion<User> {
     if (name.present) {
       map['name'] = Variable<String>(name.value);
     }
+    if (birthday.present) {
+      map['birthday'] = Variable<DateTime>(birthday.value);
+    }
     if (nextUser.present) {
       map['next_user'] = Variable<int>(nextUser.value);
     }
@@ -133,6 +159,7 @@ class UsersCompanion extends UpdateCompanion<User> {
     return (StringBuffer('UsersCompanion(')
           ..write('id: $id, ')
           ..write('name: $name, ')
+          ..write('birthday: $birthday, ')
           ..write('nextUser: $nextUser')
           ..write(')'))
         .toString();
@@ -158,6 +185,11 @@ class $UsersTable extends Users with TableInfo<$UsersTable, User> {
       type: DriftSqlType.string,
       requiredDuringInsert: false,
       defaultValue: const Constant('name'));
+  final VerificationMeta _birthdayMeta = const VerificationMeta('birthday');
+  @override
+  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
+      'birthday', aliasedName, true,
+      type: DriftSqlType.dateTime, requiredDuringInsert: false);
   final VerificationMeta _nextUserMeta = const VerificationMeta('nextUser');
   @override
   late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
@@ -166,7 +198,7 @@ class $UsersTable extends Users with TableInfo<$UsersTable, User> {
       requiredDuringInsert: false,
       defaultConstraints: 'REFERENCES users (id)');
   @override
-  List<GeneratedColumn> get $columns => [id, name, nextUser];
+  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
   @override
   String get aliasedName => _alias ?? 'users';
   @override
@@ -183,6 +215,10 @@ class $UsersTable extends Users with TableInfo<$UsersTable, User> {
       context.handle(
           _nameMeta, name.isAcceptableOrUnknown(data['name']!, _nameMeta));
     }
+    if (data.containsKey('birthday')) {
+      context.handle(_birthdayMeta,
+          birthday.isAcceptableOrUnknown(data['birthday']!, _birthdayMeta));
+    }
     if (data.containsKey('next_user')) {
       context.handle(_nextUserMeta,
           nextUser.isAcceptableOrUnknown(data['next_user']!, _nextUserMeta));
@@ -200,6 +236,8 @@ class $UsersTable extends Users with TableInfo<$UsersTable, User> {
           .read(DriftSqlType.int, data['${effectivePrefix}id'])!,
       name: attachedDatabase.options.types
           .read(DriftSqlType.string, data['${effectivePrefix}name'])!,
+      birthday: attachedDatabase.options.types
+          .read(DriftSqlType.dateTime, data['${effectivePrefix}birthday']),
       nextUser: attachedDatabase.options.types
           .read(DriftSqlType.int, data['${effectivePrefix}next_user']),
     );
@@ -463,11 +501,13 @@ class Groups extends Table with TableInfo<Groups, Group> {
 class GroupCountData extends DataClass {
   final int id;
   final String name;
+  final DateTime? birthday;
   final int? nextUser;
   final int groupCount;
   const GroupCountData(
       {required this.id,
       required this.name,
+      this.birthday,
       this.nextUser,
       required this.groupCount});
   factory GroupCountData.fromJson(Map<String, dynamic> json,
@@ -476,6 +516,7 @@ class GroupCountData extends DataClass {
     return GroupCountData(
       id: serializer.fromJson<int>(json['id']),
       name: serializer.fromJson<String>(json['name']),
+      birthday: serializer.fromJson<DateTime?>(json['birthday']),
       nextUser: serializer.fromJson<int?>(json['nextUser']),
       groupCount: serializer.fromJson<int>(json['groupCount']),
     );
@@ -486,16 +527,22 @@ class GroupCountData extends DataClass {
     return <String, dynamic>{
       'id': serializer.toJson<int>(id),
       'name': serializer.toJson<String>(name),
+      'birthday': serializer.toJson<DateTime?>(birthday),
       'nextUser': serializer.toJson<int?>(nextUser),
       'groupCount': serializer.toJson<int>(groupCount),
     };
   }
 
   GroupCountData copyWith(
-          {int? id, String? name, int? nextUser, int? groupCount}) =>
+          {int? id,
+          String? name,
+          DateTime? birthday,
+          int? nextUser,
+          int? groupCount}) =>
       GroupCountData(
         id: id ?? this.id,
         name: name ?? this.name,
+        birthday: birthday ?? this.birthday,
         nextUser: nextUser ?? this.nextUser,
         groupCount: groupCount ?? this.groupCount,
       );
@@ -504,6 +551,7 @@ class GroupCountData extends DataClass {
     return (StringBuffer('GroupCountData(')
           ..write('id: $id, ')
           ..write('name: $name, ')
+          ..write('birthday: $birthday, ')
           ..write('nextUser: $nextUser, ')
           ..write('groupCount: $groupCount')
           ..write(')'))
@@ -511,13 +559,14 @@ class GroupCountData extends DataClass {
   }
 
   @override
-  int get hashCode => Object.hash(id, name, nextUser, groupCount);
+  int get hashCode => Object.hash(id, name, birthday, nextUser, groupCount);
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
       (other is GroupCountData &&
           other.id == this.id &&
           other.name == this.name &&
+          other.birthday == this.birthday &&
           other.nextUser == this.nextUser &&
           other.groupCount == this.groupCount);
 }
@@ -529,7 +578,8 @@ class GroupCount extends ViewInfo<GroupCount, GroupCountData>
   final _$Database attachedDatabase;
   GroupCount(this.attachedDatabase, [this._alias]);
   @override
-  List<GeneratedColumn> get $columns => [id, name, nextUser, groupCount];
+  List<GeneratedColumn> get $columns =>
+      [id, name, birthday, nextUser, groupCount];
   @override
   String get aliasedName => _alias ?? entityName;
   @override
@@ -547,6 +597,8 @@ class GroupCount extends ViewInfo<GroupCount, GroupCountData>
           .read(DriftSqlType.int, data['${effectivePrefix}id'])!,
       name: attachedDatabase.options.types
           .read(DriftSqlType.string, data['${effectivePrefix}name'])!,
+      birthday: attachedDatabase.options.types
+          .read(DriftSqlType.dateTime, data['${effectivePrefix}birthday']),
       nextUser: attachedDatabase.options.types
           .read(DriftSqlType.int, data['${effectivePrefix}next_user']),
       groupCount: attachedDatabase.options.types
@@ -559,6 +611,9 @@ class GroupCount extends ViewInfo<GroupCount, GroupCountData>
   late final GeneratedColumn<String> name = GeneratedColumn<String>(
       'name', aliasedName, false,
       type: DriftSqlType.string);
+  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
+      'birthday', aliasedName, true,
+      type: DriftSqlType.dateTime);
   late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
       'next_user', aliasedName, true,
       type: DriftSqlType.int);
@@ -587,4 +642,7 @@ abstract class _$Database extends GeneratedDatabase {
   @override
   List<DatabaseSchemaEntity> get allSchemaEntities =>
       [users, groups, groupCount];
+  @override
+  DriftDatabaseOptions get options =>
+      const DriftDatabaseOptions(storeDateTimeAsText: true);
 }

examples/migrations_example/lib/src/generated/schema.dart

@@ -2,6 +2,7 @@
 //@dart=2.12
 import 'package:drift/drift.dart';
 import 'package:drift_dev/api/migrations.dart';
+import 'schema_v6.dart' as v6;
 import 'schema_v2.dart' as v2;
 import 'schema_v3.dart' as v3;
 import 'schema_v4.dart' as v4;
@@ -12,6 +13,8 @@ class GeneratedHelper implements SchemaInstantiationHelper {
   @override
   GeneratedDatabase databaseForVersion(QueryExecutor db, int version) {
     switch (version) {
+      case 6:
+        return v6.DatabaseAtV6(db);
       case 2:
         return v2.DatabaseAtV2(db);
       case 3:
@@ -23,7 +26,7 @@ class GeneratedHelper implements SchemaInstantiationHelper {
       case 5:
         return v5.DatabaseAtV5(db);
       default:
-        throw MissingSchemaException(version, const {2, 3, 4, 1, 5});
+        throw MissingSchemaException(version, const {6, 2, 3, 4, 1, 5});
     }
   }
 }

examples/migrations_example/lib/src/generated/schema_v6.dart

@@ -0,0 +1,162 @@
+// GENERATED CODE, DO NOT EDIT BY HAND.
+//@dart=2.12
+import 'package:drift/drift.dart';
+
+class Users extends Table with TableInfo {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  Users(this.attachedDatabase, [this._alias]);
+  late final GeneratedColumn<int> id = GeneratedColumn<int>(
+      'id', aliasedName, false,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      defaultConstraints: 'PRIMARY KEY AUTOINCREMENT');
+  late final GeneratedColumn<String> name = GeneratedColumn<String>(
+      'name', aliasedName, false,
+      type: DriftSqlType.string,
+      requiredDuringInsert: false,
+      defaultValue: const Constant('name'));
+  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
+      'birthday', aliasedName, true,
+      type: DriftSqlType.dateTime, requiredDuringInsert: false);
+  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
+      'next_user', aliasedName, true,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      defaultConstraints: 'REFERENCES users (id)');
+  @override
+  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
+  @override
+  String get aliasedName => _alias ?? 'users';
+  @override
+  String get actualTableName => 'users';
+  @override
+  Set<GeneratedColumn> get $primaryKey => {id};
+  @override
+  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
+    throw UnsupportedError('TableInfo.map in schema verification code');
+  }
+
+  @override
+  Users createAlias(String alias) {
+    return Users(attachedDatabase, alias);
+  }
+
+  @override
+  bool get dontWriteConstraints => false;
+}
+
+class Groups extends Table with TableInfo {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  Groups(this.attachedDatabase, [this._alias]);
+  late final GeneratedColumn<int> id = GeneratedColumn<int>(
+      'id', aliasedName, false,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      $customConstraints: 'NOT NULL');
+  late final GeneratedColumn<String> title = GeneratedColumn<String>(
+      'title', aliasedName, false,
+      type: DriftSqlType.string,
+      requiredDuringInsert: true,
+      $customConstraints: 'NOT NULL');
+  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
+      'deleted', aliasedName, true,
+      type: DriftSqlType.bool,
+      requiredDuringInsert: false,
+      $customConstraints: 'DEFAULT FALSE',
+      defaultValue: const CustomExpression<bool>('FALSE'));
+  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
+      'owner', aliasedName, false,
+      type: DriftSqlType.int,
+      requiredDuringInsert: true,
+      $customConstraints: 'NOT NULL REFERENCES users (id)');
+  @override
+  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
+  @override
+  String get aliasedName => _alias ?? 'groups';
+  @override
+  String get actualTableName => 'groups';
+  @override
+  Set<GeneratedColumn> get $primaryKey => {id};
+  @override
+  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
+    throw UnsupportedError('TableInfo.map in schema verification code');
+  }
+
+  @override
+  Groups createAlias(String alias) {
+    return Groups(attachedDatabase, alias);
+  }
+
+  @override
+  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
+  @override
+  bool get dontWriteConstraints => true;
+}
+
+class GroupCount extends ViewInfo<GroupCount, Never> implements HasResultSet {
+  final String? _alias;
+  @override
+  final DatabaseAtV6 attachedDatabase;
+  GroupCount(this.attachedDatabase, [this._alias]);
+  @override
+  List<GeneratedColumn> get $columns =>
+      [id, name, birthday, nextUser, groupCount];
+  @override
+  String get aliasedName => _alias ?? entityName;
+  @override
+  String get entityName => 'group_count';
+  @override
+  String? get createViewStmt => null;
+  @override
+  GroupCount get asDslTable => this;
+  @override
+  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
+    throw UnsupportedError('TableInfo.map in schema verification code');
+  }
+
+  late final GeneratedColumn<int> id =
+      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
+  late final GeneratedColumn<String> name = GeneratedColumn<String>(
+      'name', aliasedName, false,
+      type: DriftSqlType.string);
+  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
+      'birthday', aliasedName, true,
+      type: DriftSqlType.dateTime);
+  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
+      'next_user', aliasedName, true,
+      type: DriftSqlType.int);
+  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
+      'group_count', aliasedName, false,
+      type: DriftSqlType.int);
+  @override
+  GroupCount createAlias(String alias) {
+    return GroupCount(attachedDatabase, alias);
+  }
+
+  @override
+  Query? get query => null;
+  @override
+  Set<String> get readTables => const {};
+}
+
+class DatabaseAtV6 extends GeneratedDatabase {
+  DatabaseAtV6(QueryExecutor e) : super(e);
+  DatabaseAtV6.connect(DatabaseConnection c) : super.connect(c);
+  late final Users users = Users(this);
+  late final Groups groups = Groups(this);
+  late final GroupCount groupCount = GroupCount(this);
+  @override
+  Iterable<TableInfo> get allTables => allSchemaEntities.whereType<TableInfo>();
+  @override
+  List<DatabaseSchemaEntity> get allSchemaEntities =>
+      [users, groups, groupCount];
+  @override
+  int get schemaVersion => 6;
+  @override
+  DriftDatabaseOptions get options =>
+      const DriftDatabaseOptions(storeDateTimeAsText: true);
+}

examples/migrations_example/lib/tables.dart

@@ -6,5 +6,8 @@ class Users extends Table {
   // added in schema version 2, got a default in version 4
   TextColumn get name => text().withDefault(const Constant('name'))();
 
+  // Column added in version 6
+  DateTimeColumn get birthday => dateTime().nullable()();
+
   IntColumn get nextUser => integer().nullable().references(Users, #id)();
 }

examples/migrations_example/test/generated/schema.dart

@@ -2,6 +2,7 @@
 //@dart=2.12
 import 'package:drift/drift.dart';
 import 'package:drift_dev/api/migrations.dart';
+import 'schema_v6.dart' as v6;
 import 'schema_v2.dart' as v2;
 import 'schema_v3.dart' as v3;
 import 'schema_v4.dart' as v4;
@@ -12,6 +13,8 @@ class GeneratedHelper implements SchemaInstantiationHelper {
   @override
   GeneratedDatabase databaseForVersion(QueryExecutor db, int version) {
     switch (version) {
+      case 6:
+        return v6.DatabaseAtV6(db);
       case 2:
         return v2.DatabaseAtV2(db);
       case 3:
@@ -23,7 +26,7 @@ class GeneratedHelper implements SchemaInstantiationHelper {
       case 5:
         return v5.DatabaseAtV5(db);
       default:
-        throw MissingSchemaException(version, const {2, 3, 4, 1, 5});
+        throw MissingSchemaException(version, const {6, 2, 3, 4, 1, 5});
     }
   }
 }

examples/migrations_example/test/generated/schema_v1.dart

@@ -4,7 +4,7 @@ import 'package:drift/drift.dart';
 
 class UsersData extends DataClass implements Insertable<UsersData> {
   final int id;
-  UsersData({required this.id});
+  const UsersData({required this.id});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};

examples/migrations_example/test/generated/schema_v2.dart

@@ -5,7 +5,7 @@ import 'package:drift/drift.dart';
 class UsersData extends DataClass implements Insertable<UsersData> {
   final int id;
   final String name;
-  UsersData({required this.id, required this.name});
+  const UsersData({required this.id, required this.name});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};

examples/migrations_example/test/generated/schema_v3.dart

@@ -5,7 +5,7 @@ import 'package:drift/drift.dart';
 class UsersData extends DataClass implements Insertable<UsersData> {
   final int id;
   final String name;
-  UsersData({required this.id, required this.name});
+  const UsersData({required this.id, required this.name});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};
@@ -155,7 +155,7 @@ class GroupsData extends DataClass implements Insertable<GroupsData> {
   final String title;
   final bool? deleted;
   final int owner;
-  GroupsData(
+  const GroupsData(
       {required this.id,
       required this.title,
       this.deleted,

examples/migrations_example/test/generated/schema_v4.dart

@@ -5,7 +5,7 @@ import 'package:drift/drift.dart';
 class UsersData extends DataClass implements Insertable<UsersData> {
   final int id;
   final String name;
-  UsersData({required this.id, required this.name});
+  const UsersData({required this.id, required this.name});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};
@@ -157,7 +157,7 @@ class GroupsData extends DataClass implements Insertable<GroupsData> {
   final String title;
   final bool? deleted;
   final int owner;
-  GroupsData(
+  const GroupsData(
       {required this.id,
       required this.title,
       this.deleted,

examples/migrations_example/test/generated/schema_v5.dart

@@ -6,7 +6,7 @@ class UsersData extends DataClass implements Insertable<UsersData> {
   final int id;
   final String name;
   final int? nextUser;
-  UsersData({required this.id, required this.name, this.nextUser});
+  const UsersData({required this.id, required this.name, this.nextUser});
   @override
   Map<String, Expression> toColumns(bool nullToAbsent) {
     final map = <String, Expression>{};
@@ -189,7 +189,7 @@ class GroupsData extends DataClass implements Insertable<GroupsData> {
   final String title;
   final bool? deleted;
   final int owner;
-  GroupsData(
+  const GroupsData(
       {required this.id,
       required this.title,
       this.deleted,
@@ -408,7 +408,7 @@ class GroupCountData extends DataClass {
   final String name;
   final int? nextUser;
   final int groupCount;
-  GroupCountData(
+  const GroupCountData(
       {required this.id,
       required this.name,
       this.nextUser,

examples/migrations_example/test/generated/schema_v6.dart

@@ -0,0 +1,587 @@
+// GENERATED CODE, DO NOT EDIT BY HAND.
+//@dart=2.12
+import 'package:drift/drift.dart';
+
+class UsersData extends DataClass implements Insertable<UsersData> {
+  final int id;
+  final String name;
+  final DateTime? birthday;
+  final int? nextUser;
+  const UsersData(
+      {required this.id, required this.name, this.birthday, this.nextUser});
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    map['id'] = Variable<int>(id);
+    map['name'] = Variable<String>(name);
+    if (!nullToAbsent || birthday != null) {
+      map['birthday'] = Variable<DateTime>(birthday);
+    }
+    if (!nullToAbsent || nextUser != null) {
+      map['next_user'] = Variable<int>(nextUser);
+    }
+    return map;
+  }
+
+  UsersCompanion toCompanion(bool nullToAbsent) {
+    return UsersCompanion(
+      id: Value(id),
+      name: Value(name),
+      birthday: birthday == null && nullToAbsent
+          ? const Value.absent()
+          : Value(birthday),
+      nextUser: nextUser == null && nullToAbsent
+          ? const Value.absent()
+          : Value(nextUser),
+    );
+  }
+
+  factory UsersData.fromJson(Map<String, dynamic> json,
+      {ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return UsersData(
+      id: serializer.fromJson<int>(json['id']),
+      name: serializer.fromJson<String>(json['name']),
+      birthday: serializer.fromJson<DateTime?>(json['birthday']),
+      nextUser: serializer.fromJson<int?>(json['nextUser']),
+    );
+  }
+  @override
+  Map<String, dynamic> toJson({ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return <String, dynamic>{
+      'id': serializer.toJson<int>(id),
+      'name': serializer.toJson<String>(name),
+      'birthday': serializer.toJson<DateTime?>(birthday),
+      'nextUser': serializer.toJson<int?>(nextUser),
+    };
+  }
+
+  UsersData copyWith(
+          {int? id, String? name, DateTime? birthday, int? nextUser}) =>
+      UsersData(
+        id: id ?? this.id,
+        name: name ?? this.name,
+        birthday: birthday ?? this.birthday,
+        nextUser: nextUser ?? this.nextUser,
+      );
+  @override
+  String toString() {
+    return (StringBuffer('UsersData(')
+          ..write('id: $id, ')
+          ..write('name: $name, ')
+          ..write('birthday: $birthday, ')
+          ..write('nextUser: $nextUser')
+          ..write(')'))
+        .toString();
+  }
+
+  @override
+  int get hashCode => Object.hash(id, name, birthday, nextUser);
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      (other is UsersData &&
+          other.id == this.id &&
+          other.name == this.name &&
+          other.birthday == this.birthday &&
+          other.nextUser == this.nextUser);
+}
+
+class UsersCompanion extends UpdateCompanion<UsersData> {
+  final Value<int> id;
+  final Value<String> name;
+  final Value<DateTime?> birthday;
+  final Value<int?> nextUser;
+  const UsersCompanion({
+    this.id = const Value.absent(),
+    this.name = const Value.absent(),
+    this.birthday = const Value.absent(),
+    this.nextUser = const Value.absent(),
+  });
+  UsersCompanion.insert({
+    this.id = const Value.absent(),
+    this.name = const Value.absent(),
+    this.birthday = const Value.absent(),
+    this.nextUser = const Value.absent(),
+  });
+  static Insertable<UsersData> custom({
+    Expression<int>? id,
+    Expression<String>? name,
+    Expression<DateTime>? birthday,
+    Expression<int>? nextUser,
+  }) {
+    return RawValuesInsertable({
+      if (id != null) 'id': id,
+      if (name != null) 'name': name,
+      if (birthday != null) 'birthday': birthday,
+      if (nextUser != null) 'next_user': nextUser,
+    });
+  }
+
+  UsersCompanion copyWith(
+      {Value<int>? id,
+      Value<String>? name,
+      Value<DateTime?>? birthday,
+      Value<int?>? nextUser}) {
+    return UsersCompanion(
+      id: id ?? this.id,
+      name: name ?? this.name,
+      birthday: birthday ?? this.birthday,
+      nextUser: nextUser ?? this.nextUser,
+    );
+  }
+
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    if (id.present) {
+      map['id'] = Variable<int>(id.value);
+    }
+    if (name.present) {
+      map['name'] = Variable<String>(name.value);
+    }
+    if (birthday.present) {
+      map['birthday'] = Variable<DateTime>(birthday.value);
+    }
+    if (nextUser.present) {
+      map['next_user'] = Variable<int>(nextUser.value);
+    }
+    return map;
+  }
+
+  @override
+  String toString() {
+    return (StringBuffer('UsersCompanion(')
+          ..write('id: $id, ')
+          ..write('name: $name, ')
+          ..write('birthday: $birthday, ')
+          ..write('nextUser: $nextUser')
+          ..write(')'))
+        .toString();
+  }
+}
+
+class Users extends Table with TableInfo<Users, UsersData> {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  Users(this.attachedDatabase, [this._alias]);
+  late final GeneratedColumn<int> id = GeneratedColumn<int>(
+      'id', aliasedName, false,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      defaultConstraints: 'PRIMARY KEY AUTOINCREMENT');
+  late final GeneratedColumn<String> name = GeneratedColumn<String>(
+      'name', aliasedName, false,
+      type: DriftSqlType.string,
+      requiredDuringInsert: false,
+      defaultValue: const Constant('name'));
+  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
+      'birthday', aliasedName, true,
+      type: DriftSqlType.dateTime, requiredDuringInsert: false);
+  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
+      'next_user', aliasedName, true,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      defaultConstraints: 'REFERENCES users (id)');
+  @override
+  List<GeneratedColumn> get $columns => [id, name, birthday, nextUser];
+  @override
+  String get aliasedName => _alias ?? 'users';
+  @override
+  String get actualTableName => 'users';
+  @override
+  Set<GeneratedColumn> get $primaryKey => {id};
+  @override
+  UsersData map(Map<String, dynamic> data, {String? tablePrefix}) {
+    final effectivePrefix = tablePrefix != null ? '$tablePrefix.' : '';
+    return UsersData(
+      id: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}id'])!,
+      name: attachedDatabase.options.types
+          .read(DriftSqlType.string, data['${effectivePrefix}name'])!,
+      birthday: attachedDatabase.options.types
+          .read(DriftSqlType.dateTime, data['${effectivePrefix}birthday']),
+      nextUser: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}next_user']),
+    );
+  }
+
+  @override
+  Users createAlias(String alias) {
+    return Users(attachedDatabase, alias);
+  }
+
+  @override
+  bool get dontWriteConstraints => false;
+}
+
+class GroupsData extends DataClass implements Insertable<GroupsData> {
+  final int id;
+  final String title;
+  final bool? deleted;
+  final int owner;
+  const GroupsData(
+      {required this.id,
+      required this.title,
+      this.deleted,
+      required this.owner});
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    map['id'] = Variable<int>(id);
+    map['title'] = Variable<String>(title);
+    if (!nullToAbsent || deleted != null) {
+      map['deleted'] = Variable<bool>(deleted);
+    }
+    map['owner'] = Variable<int>(owner);
+    return map;
+  }
+
+  GroupsCompanion toCompanion(bool nullToAbsent) {
+    return GroupsCompanion(
+      id: Value(id),
+      title: Value(title),
+      deleted: deleted == null && nullToAbsent
+          ? const Value.absent()
+          : Value(deleted),
+      owner: Value(owner),
+    );
+  }
+
+  factory GroupsData.fromJson(Map<String, dynamic> json,
+      {ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return GroupsData(
+      id: serializer.fromJson<int>(json['id']),
+      title: serializer.fromJson<String>(json['title']),
+      deleted: serializer.fromJson<bool?>(json['deleted']),
+      owner: serializer.fromJson<int>(json['owner']),
+    );
+  }
+  @override
+  Map<String, dynamic> toJson({ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return <String, dynamic>{
+      'id': serializer.toJson<int>(id),
+      'title': serializer.toJson<String>(title),
+      'deleted': serializer.toJson<bool?>(deleted),
+      'owner': serializer.toJson<int>(owner),
+    };
+  }
+
+  GroupsData copyWith({int? id, String? title, bool? deleted, int? owner}) =>
+      GroupsData(
+        id: id ?? this.id,
+        title: title ?? this.title,
+        deleted: deleted ?? this.deleted,
+        owner: owner ?? this.owner,
+      );
+  @override
+  String toString() {
+    return (StringBuffer('GroupsData(')
+          ..write('id: $id, ')
+          ..write('title: $title, ')
+          ..write('deleted: $deleted, ')
+          ..write('owner: $owner')
+          ..write(')'))
+        .toString();
+  }
+
+  @override
+  int get hashCode => Object.hash(id, title, deleted, owner);
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      (other is GroupsData &&
+          other.id == this.id &&
+          other.title == this.title &&
+          other.deleted == this.deleted &&
+          other.owner == this.owner);
+}
+
+class GroupsCompanion extends UpdateCompanion<GroupsData> {
+  final Value<int> id;
+  final Value<String> title;
+  final Value<bool?> deleted;
+  final Value<int> owner;
+  const GroupsCompanion({
+    this.id = const Value.absent(),
+    this.title = const Value.absent(),
+    this.deleted = const Value.absent(),
+    this.owner = const Value.absent(),
+  });
+  GroupsCompanion.insert({
+    this.id = const Value.absent(),
+    required String title,
+    this.deleted = const Value.absent(),
+    required int owner,
+  })  : title = Value(title),
+        owner = Value(owner);
+  static Insertable<GroupsData> custom({
+    Expression<int>? id,
+    Expression<String>? title,
+    Expression<bool>? deleted,
+    Expression<int>? owner,
+  }) {
+    return RawValuesInsertable({
+      if (id != null) 'id': id,
+      if (title != null) 'title': title,
+      if (deleted != null) 'deleted': deleted,
+      if (owner != null) 'owner': owner,
+    });
+  }
+
+  GroupsCompanion copyWith(
+      {Value<int>? id,
+      Value<String>? title,
+      Value<bool?>? deleted,
+      Value<int>? owner}) {
+    return GroupsCompanion(
+      id: id ?? this.id,
+      title: title ?? this.title,
+      deleted: deleted ?? this.deleted,
+      owner: owner ?? this.owner,
+    );
+  }
+
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    if (id.present) {
+      map['id'] = Variable<int>(id.value);
+    }
+    if (title.present) {
+      map['title'] = Variable<String>(title.value);
+    }
+    if (deleted.present) {
+      map['deleted'] = Variable<bool>(deleted.value);
+    }
+    if (owner.present) {
+      map['owner'] = Variable<int>(owner.value);
+    }
+    return map;
+  }
+
+  @override
+  String toString() {
+    return (StringBuffer('GroupsCompanion(')
+          ..write('id: $id, ')
+          ..write('title: $title, ')
+          ..write('deleted: $deleted, ')
+          ..write('owner: $owner')
+          ..write(')'))
+        .toString();
+  }
+}
+
+class Groups extends Table with TableInfo<Groups, GroupsData> {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  Groups(this.attachedDatabase, [this._alias]);
+  late final GeneratedColumn<int> id = GeneratedColumn<int>(
+      'id', aliasedName, false,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      $customConstraints: 'NOT NULL');
+  late final GeneratedColumn<String> title = GeneratedColumn<String>(
+      'title', aliasedName, false,
+      type: DriftSqlType.string,
+      requiredDuringInsert: true,
+      $customConstraints: 'NOT NULL');
+  late final GeneratedColumn<bool> deleted = GeneratedColumn<bool>(
+      'deleted', aliasedName, true,
+      type: DriftSqlType.bool,
+      requiredDuringInsert: false,
+      $customConstraints: 'DEFAULT FALSE',
+      defaultValue: const CustomExpression<bool>('FALSE'));
+  late final GeneratedColumn<int> owner = GeneratedColumn<int>(
+      'owner', aliasedName, false,
+      type: DriftSqlType.int,
+      requiredDuringInsert: true,
+      $customConstraints: 'NOT NULL REFERENCES users (id)');
+  @override
+  List<GeneratedColumn> get $columns => [id, title, deleted, owner];
+  @override
+  String get aliasedName => _alias ?? 'groups';
+  @override
+  String get actualTableName => 'groups';
+  @override
+  Set<GeneratedColumn> get $primaryKey => {id};
+  @override
+  GroupsData map(Map<String, dynamic> data, {String? tablePrefix}) {
+    final effectivePrefix = tablePrefix != null ? '$tablePrefix.' : '';
+    return GroupsData(
+      id: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}id'])!,
+      title: attachedDatabase.options.types
+          .read(DriftSqlType.string, data['${effectivePrefix}title'])!,
+      deleted: attachedDatabase.options.types
+          .read(DriftSqlType.bool, data['${effectivePrefix}deleted']),
+      owner: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}owner'])!,
+    );
+  }
+
+  @override
+  Groups createAlias(String alias) {
+    return Groups(attachedDatabase, alias);
+  }
+
+  @override
+  List<String> get customConstraints => const ['PRIMARY KEY (id)'];
+  @override
+  bool get dontWriteConstraints => true;
+}
+
+class GroupCountData extends DataClass {
+  final int id;
+  final String name;
+  final DateTime? birthday;
+  final int? nextUser;
+  final int groupCount;
+  const GroupCountData(
+      {required this.id,
+      required this.name,
+      this.birthday,
+      this.nextUser,
+      required this.groupCount});
+  factory GroupCountData.fromJson(Map<String, dynamic> json,
+      {ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return GroupCountData(
+      id: serializer.fromJson<int>(json['id']),
+      name: serializer.fromJson<String>(json['name']),
+      birthday: serializer.fromJson<DateTime?>(json['birthday']),
+      nextUser: serializer.fromJson<int?>(json['nextUser']),
+      groupCount: serializer.fromJson<int>(json['groupCount']),
+    );
+  }
+  @override
+  Map<String, dynamic> toJson({ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return <String, dynamic>{
+      'id': serializer.toJson<int>(id),
+      'name': serializer.toJson<String>(name),
+      'birthday': serializer.toJson<DateTime?>(birthday),
+      'nextUser': serializer.toJson<int?>(nextUser),
+      'groupCount': serializer.toJson<int>(groupCount),
+    };
+  }
+
+  GroupCountData copyWith(
+          {int? id,
+          String? name,
+          DateTime? birthday,
+          int? nextUser,
+          int? groupCount}) =>
+      GroupCountData(
+        id: id ?? this.id,
+        name: name ?? this.name,
+        birthday: birthday ?? this.birthday,
+        nextUser: nextUser ?? this.nextUser,
+        groupCount: groupCount ?? this.groupCount,
+      );
+  @override
+  String toString() {
+    return (StringBuffer('GroupCountData(')
+          ..write('id: $id, ')
+          ..write('name: $name, ')
+          ..write('birthday: $birthday, ')
+          ..write('nextUser: $nextUser, ')
+          ..write('groupCount: $groupCount')
+          ..write(')'))
+        .toString();
+  }
+
+  @override
+  int get hashCode => Object.hash(id, name, birthday, nextUser, groupCount);
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      (other is GroupCountData &&
+          other.id == this.id &&
+          other.name == this.name &&
+          other.birthday == this.birthday &&
+          other.nextUser == this.nextUser &&
+          other.groupCount == this.groupCount);
+}
+
+class GroupCount extends ViewInfo<GroupCount, GroupCountData>
+    implements HasResultSet {
+  final String? _alias;
+  @override
+  final DatabaseAtV6 attachedDatabase;
+  GroupCount(this.attachedDatabase, [this._alias]);
+  @override
+  List<GeneratedColumn> get $columns =>
+      [id, name, birthday, nextUser, groupCount];
+  @override
+  String get aliasedName => _alias ?? entityName;
+  @override
+  String get entityName => 'group_count';
+  @override
+  String? get createViewStmt => null;
+  @override
+  GroupCount get asDslTable => this;
+  @override
+  GroupCountData map(Map<String, dynamic> data, {String? tablePrefix}) {
+    final effectivePrefix = tablePrefix != null ? '$tablePrefix.' : '';
+    return GroupCountData(
+      id: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}id'])!,
+      name: attachedDatabase.options.types
+          .read(DriftSqlType.string, data['${effectivePrefix}name'])!,
+      birthday: attachedDatabase.options.types
+          .read(DriftSqlType.dateTime, data['${effectivePrefix}birthday']),
+      nextUser: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}next_user']),
+      groupCount: attachedDatabase.options.types
+          .read(DriftSqlType.int, data['${effectivePrefix}group_count'])!,
+    );
+  }
+
+  late final GeneratedColumn<int> id =
+      GeneratedColumn<int>('id', aliasedName, false, type: DriftSqlType.int);
+  late final GeneratedColumn<String> name = GeneratedColumn<String>(
+      'name', aliasedName, false,
+      type: DriftSqlType.string);
+  late final GeneratedColumn<DateTime> birthday = GeneratedColumn<DateTime>(
+      'birthday', aliasedName, true,
+      type: DriftSqlType.dateTime);
+  late final GeneratedColumn<int> nextUser = GeneratedColumn<int>(
+      'next_user', aliasedName, true,
+      type: DriftSqlType.int);
+  late final GeneratedColumn<int> groupCount = GeneratedColumn<int>(
+      'group_count', aliasedName, false,
+      type: DriftSqlType.int);
+  @override
+  GroupCount createAlias(String alias) {
+    return GroupCount(attachedDatabase, alias);
+  }
+
+  @override
+  Query? get query => null;
+  @override
+  Set<String> get readTables => const {};
+}
+
+class DatabaseAtV6 extends GeneratedDatabase {
+  DatabaseAtV6(QueryExecutor e) : super(e);
+  DatabaseAtV6.connect(DatabaseConnection c) : super.connect(c);
+  late final Users users = Users(this);
+  late final Groups groups = Groups(this);
+  late final GroupCount groupCount = GroupCount(this);
+  @override
+  Iterable<TableInfo> get allTables => allSchemaEntities.whereType<TableInfo>();
+  @override
+  List<DatabaseSchemaEntity> get allSchemaEntities =>
+      [users, groups, groupCount];
+  @override
+  int get schemaVersion => 6;
+  @override
+  DriftDatabaseOptions get options =>
+      const DriftDatabaseOptions(storeDateTimeAsText: true);
+}

examples/migrations_example/test/migration_test.dart

@@ -98,4 +98,12 @@ void main() {
             .having((e) => e.groupCount, 'groupCount', 0)));
     await migratedDb.close();
   });
+
+  test('upgrade from v5 to v6', () async {
+    final connection = await verifier.startAt(5);
+    final db = Database(connection);
+    addTearDown(db.close);
+
+    await verifier.migrateAndValidate(db, 6);
+  });
 }