Fix web build

Author: buenaflor

flutter/example/lib/drift/connection/connection.dart

@@ -0,0 +1,2 @@
+export 'unsupported.dart'
+    if (dart.library.ffi) 'native.dart';

flutter/example/lib/drift/connection/native.dart

@@ -0,0 +1,7 @@
+import 'package:drift/backends.dart';
+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+
+QueryExecutor inMemoryExecutor() {
+  return NativeDatabase.memory();
+}

flutter/example/lib/drift/connection/unsupported.dart

@@ -0,0 +1,16 @@
+import 'package:drift/drift.dart';
+
+Never _unsupported() {
+  throw UnsupportedError(
+      'No suitable database implementation was found on this platform.');
+}
+
+// Depending on the platform the app is compiled to, the following stubs will
+// be replaced with the methods in native.dart or web.dart
+
+QueryExecutor inMemoryExecutor() {
+  return _unsupported();
+}
+Future<void> validateDatabaseSchema(GeneratedDatabase database) async {
+  _unsupported();
+}

flutter/example/lib/drift/database.dart

@@ -1,7 +1,4 @@
-import 'dart:io';
-
 import 'package:drift/drift.dart';
-import 'package:drift/native.dart';
 
 part 'database.g.dart';
 

flutter/example/lib/main.dart

@@ -3,7 +3,6 @@
 import 'dart:async';
 import 'dart:convert';
 
-import 'package:drift/native.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -19,6 +18,7 @@ import 'package:universal_platform/universal_platform.dart';
 import 'package:feedback/feedback.dart' as feedback;
 import 'package:provider/provider.dart';
 import 'drift/database.dart';
+import 'drift/connection/connection.dart';
 import 'user_feedback_dialog.dart';
 import 'package:dio/dio.dart';
 import 'package:sentry_dio/sentry_dio.dart';
@@ -153,7 +153,7 @@ class MainScaffold extends StatelessWidget {
           children: [
             if (_isIntegrationTest) const IntegrationTestWidget(),
             const Center(child: Text('Trigger an action:\n')),
-            // For simplicity sake we skip the web set up.
+            // For simplicity sake we skip the web set up for now.
             if (!UniversalPlatform.isWeb)
               ElevatedButton(
                 onPressed: () => driftTest(),
@@ -486,7 +486,7 @@ class MainScaffold extends StatelessWidget {
     );
 
     final executor = SentryQueryExecutor(
-      () => NativeDatabase.memory(),
+      () async => inMemoryExecutor(),
       databaseName: 'sentry_inmemory_db',
     );