Added DB Helper.

src/db-connection/src/Db.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://hyperf.org
+ * @document https://wiki.hyperf.org
+ * @contact  group@hyperf.org
+ * @license  https://github.com/hyperf-cloud/hyperf/blob/master/LICENSE
+ */
+
+namespace Hyperf\DbConnection;
+
+use Hyperf\Database\ConnectionInterface;
+use Hyperf\Framework\ApplicationContext;
+use Psr\Container\ContainerInterface;
+
+/**
+ * DB Helper.
+ * @method static beginTransaction
+ * @method static rollback
+ * @method statuc commit
+ */
+class Db
+{
+    /**
+     * @var ContainerInterface
+     */
+    protected $container;
+
+    public function __construct(ContainerInterface $container)
+    {
+        $this->container = $container;
+    }
+
+    public function __call($name, $arguments)
+    {
+        return $this->connection()->{$name}(...$arguments);
+    }
+
+    public static function __callStatic($name, $arguments)
+    {
+        $db = ApplicationContext::getContainer()->get(Db::class);
+        return $db->connection()->{$name}(...$arguments);
+    }
+
+    public function connection($pool = 'default'): ConnectionInterface
+    {
+        $resolver = $this->container->get(ConnectionResolver::class);
+        return $resolver->connection($pool);
+    }
+}