Initial

system/Database/Migration.php

@@ -0,0 +1,73 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Database;
+
+use Config\Database;
+
+/**
+ * Class Migration
+ */
+abstract class Migration
+{
+    /**
+     * The name of the database group to use.
+     *
+     * @var string
+     */
+    protected $DBGroup;
+
+    /**
+     * Database Connection instance
+     *
+     * @var ConnectionInterface
+     */
+    protected $db;
+
+    /**
+     * Database Forge instance.
+     *
+     * @var Forge
+     */
+    protected $forge;
+
+    /**
+     * Constructor.
+     *
+     * @param Forge $forge
+     */
+    public function __construct(?Forge $forge = null)
+    {
+        $this->forge = $forge ?? Database::forge($this->DBGroup ?? config('Database')->defaultGroup);
+
+        $this->db = $this->forge->getConnection();
+    }
+
+    /**
+     * Returns the database group name this migration uses.
+     *
+     * @return string
+     */
+    public function getDBGroup(): ?string
+    {
+        return $this->DBGroup;
+    }
+
+    /**
+     * Perform a migration step.
+     */
+    abstract public function up();
+
+    /**
+     * Revert a migration step.
+     */
+    abstract public function down();
+}