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Dart API

DuckDB.Dart is the native Dart API for DuckDB.

Installation

DuckDB.Dart can be installed from pub.dev. Please see the API Reference for details.

Use This Package as a Library

Depend on It

Run this command:

With Flutter:

flutter pub add dart_duckdb

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
  dart_duckdb: ^1.1.3

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

Import It

Now in your Dart code, you can import it:

import 'package:dart_duckdb/dart_duckdb.dart';

Usage Examples

See the example projects in the duckdb-dart repository:

  • cli: command-line application
  • duckdbexplorer: GUI application which builds for desktop operating systems as well as Android and iOS.

Here are some common code snippets for DuckDB.Dart:

Querying an In-Memory Database 

import 'package:dart_duckdb/dart_duckdb.dart';

void main() {
  final db = duckdb.open(":memory:");
  final connection = duckdb.connect(db);

  connection.execute('''
    CREATE TABLE users (id INTEGER, name VARCHAR, age INTEGER);
    INSERT INTO users VALUES (1, 'Alice', 30), (2, 'Bob', 25);
  ''');

  final result = connection.query("SELECT * FROM users WHERE age > 28").fetchAll();

  for (final row in result) {
    print(row);
  }

  connection.dispose();
  db.dispose();
}

Queries on Background Isolates 

import 'package:dart_duckdb/dart_duckdb.dart';

void main() {
  final db = duckdb.open(":memory:");
  final connection = duckdb.connect(db);

  await Isolate.spawn(backgroundTask, db.transferrable);

  connection.dispose();
  db.dispose();
}

void backgroundTask(TransferableDatabase transferableDb) {
  final connection = duckdb.connectWithTransferred(transferableDb);
  // Access database ...
  // fetch is needed to send the data back to the main isolate
}
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