diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 6f8c874..d25143c 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -1,6 +1,6 @@
 on: [push]
 jobs:
-  test:
+  test-unit:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -8,4 +8,29 @@ jobs:
         with:
           php-version: '8.3'
       - uses: php-actions/composer@v6
-      - run: ./vendor/bin/phpunit
+      - run: ./vendor/bin/phpunit --group unit
+
+  test-database:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        database:
+        - service: mysql
+          database_url: pdo-mysql://root@localhost:32016/DataAccessKit
+        - service: mariadb
+          database_url: pdo-mysql://root@localhost:35098/DataAccessKit
+        - service: postgres
+          database_url: pdo-pgsql://postgres:postgres@localhost:55720/DataAccessKit
+        - service: sqlite
+          database_url: "pdo-sqlite:///:memory:"
+    steps:
+      - uses: actions/checkout@v4
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+      - uses: php-actions/composer@v6
+      - uses: adambirds/docker-compose-action@v1.3.0
+        with:
+          compose-file: docker-compose.yaml
+          services: ${{ matrix.database.service }}
+      - run: DATABASE_URL=${{ matrix.database.database_url }} ./vendor/bin/phpunit --group database
diff --git a/data-access-kit/test/Fixture/User.php b/data-access-kit/test/Fixture/User.php
new file mode 100644
index 0000000..a913b6e
--- /dev/null
+++ b/data-access-kit/test/Fixture/User.php
@@ -0,0 +1,15 @@
+<?php declare(strict_types=1);
+
+namespace DataAccessKit\Fixture;
+
+use DataAccessKit\Attribute\Column;
+use DataAccessKit\Attribute\Table;
+
+#[Table]
+class User
+{
+	#[Column(name: "user_id", primary: true, generated: true)]
+	public int $id;
+	#[Column]
+	public string $firstName;
+}
diff --git a/data-access-kit/test/PersistenceTest.php b/data-access-kit/test/PersistenceTest.php
new file mode 100644
index 0000000..4e837b2
--- /dev/null
+++ b/data-access-kit/test/PersistenceTest.php
@@ -0,0 +1,67 @@
+<?php declare(strict_types=1);
+
+namespace DataAccessKit;
+
+use DataAccessKit\Fixture\User;
+use Doctrine\DBAL\Connection;
+use Doctrine\DBAL\DriverManager;
+use Doctrine\DBAL\Tools\DsnParser;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\TestCase;
+use function getenv;
+use function iterator_to_array;
+use function var_dump;
+
+#[Group("database")]
+class PersistenceTest extends TestCase
+{
+
+	private Connection $connection;
+	private Persistence $persistence;
+
+	public function setUp(): void
+	{
+		if (getenv("DATABASE_URL") === false) {
+			$this->markTestSkipped("Environment variable DATABASE_URL not set");
+		}
+
+		$dsnParser = new DsnParser();
+		$this->connection = DriverManager::getConnection($dsnParser->parse(getenv("DATABASE_URL")));
+		$this->persistence = new Persistence($this->connection, new Registry(new DefaultNameConverter()), new DefaultValueConverter());
+	}
+
+	private function setUpUsersTable(): void
+	{
+		$this->connection->executeStatement("DROP TABLE IF EXISTS users");
+		$this->connection->executeStatement("CREATE TABLE users (user_id INT PRIMARY KEY, first_name VARCHAR(255))");
+		$this->connection->executeStatement("INSERT INTO users (user_id, first_name) VALUES (1, 'Alice')");
+		$this->connection->executeStatement("INSERT INTO users (user_id, first_name) VALUES (2, 'Bob')");
+	}
+
+	public function testSelect(): void
+	{
+		$this->setUpUsersTable();
+		$users = iterator_to_array($this->persistence->select(User::class, "SELECT user_id, first_name FROM users"));
+		$this->assertCount(2, $users);
+		$this->assertEquals(1, $users[0]->id);
+		$this->assertEquals("Alice", $users[0]->firstName);
+		$this->assertEquals(2, $users[1]->id);
+		$this->assertEquals("Bob", $users[1]->firstName);
+	}
+
+	public function testSelectScalar(): void
+	{
+		$this->setUpUsersTable();
+		$count = $this->persistence->selectScalar("SELECT COUNT(*) FROM users");
+		$this->assertEquals(2, $count);
+	}
+
+	public function testExecute(): void
+	{
+		$this->setUpUsersTable();
+		$this->persistence->execute("DELETE FROM users WHERE user_id = 1");
+		$count = $this->persistence->selectScalar("SELECT COUNT(*) FROM users");
+		$this->assertEquals(1, $count);
+	}
+
+}
diff --git a/docker-compose.yaml b/docker-compose.yaml
new file mode 100644
index 0000000..707e672
--- /dev/null
+++ b/docker-compose.yaml
@@ -0,0 +1,32 @@
+services:
+  mysql:
+    image: mysql:latest
+    environment:
+      MYSQL_ALLOW_EMPTY_PASSWORD: "1"
+      MYSQL_DATABASE: "DataAccessKit"
+    ports:
+      - 32016:3306
+    tmpfs:
+      - /var/lib/mysql
+  mariadb:
+    image: mariadb:latest
+    environment:
+      MARIADB_ALLOW_EMPTY_ROOT_PASSWORD: "1"
+      MARIADB_DATABASE: "DataAccessKit"
+    ports:
+      - 35098:3306
+    tmpfs:
+      - /var/lib/mysql
+  postgres:
+    image: postgres:latest
+    shm_size: 128MB
+    environment:
+      POSTGRES_PASSWORD: "postgres"
+      POSTGRES_DB: "DataAccessKit"
+    ports:
+      - 55720:5432
+    tmpfs:
+      - /var/lib/postgresql
+      - /var/lib/postgresql/data
+  sqlite:
+    image: gcr.io/google_containers/pause