Add DatabaseCredentials class and implement database picker question

src/Service/DatabaseCredentials.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Service;
+
+class DatabaseCredentials
+{
+    public function __construct(
+        private string $hostname,
+        private string $user,
+        private string $password,
+    )
+    {
+    }
+
+    public function getHostname(): string
+    {
+        return $this->hostname;
+    }
+
+    public function getUser(): string
+    {
+        return $this->user;
+    }
+
+    public function getPassword(): string
+    {
+        return $this->password;
+    }
+}

src/Service/MysqliConnection.php

@@ -8,9 +8,9 @@ class MysqliConnection
 {
     private mysqli $connection;
 
-    public function __construct($hostname, $user, $password)
+    public function __construct(DatabaseCredentials $credentials)
     {
-        $this->connection = new mysqli($hostname, $user, $password);
+        $this->connection = new mysqli($credentials->getHostname(), $credentials->getUser(), $credentials->getPassword());
         if ($this->connection->connect_error) {
             throw new \Exception("Connection failed: " . $this->connection->connect_error);
         }

src/Service/Traits/SelectDatabaseQuestion.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Service\Traits;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+
+trait SelectDatabaseQuestion
+{
+    private function getDatabaseName(InputInterface $input, OutputInterface $output): string
+    {
+        $question = $this->getHelper('question');
+
+        if (!$name = $input->getArgument('name')) {
+            $selectQuestion = new ChoiceQuestion('Database name: ', $this->db->listDatabases());
+            $name = $question->ask($input, $output, $selectQuestion);
+        }
+
+        return $name;
+    }
+}