sdk-for-dart/docs/examples/databases/create-operations.md

import 'package:dart_appwrite/dart_appwrite.dart';

Client client = Client()
    .setEndpoint('https://<REGION>.cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('<YOUR_PROJECT_ID>') // Your project ID
    .setKey('<YOUR_API_KEY>'); // Your secret API key

Databases databases = Databases(client);

Transaction result = await databases.createOperations(
    transactionId: '<TRANSACTION_ID>',
    operations: [
	    {
	        "action": "create",
	        "databaseId": "<DATABASE_ID>",
	        "collectionId": "<COLLECTION_ID>",
	        "documentId": "<DOCUMENT_ID>",
	        "data": {
	            "name": "Walter O'Brien"
	        }
	    }
	], // (optional)
);