Added Doctrine Entities.

src/Entity/DBElement.php

@@ -0,0 +1,66 @@
+<?php
+/**
+ *
+ * Part-DB Version 0.4+ "nextgen"
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * This class is for managing all database objects.
+ *
+ * You should use this class for ALL classes which manages database records!
+ *          (except special tables like "internal"...)
+ * Every database table which are managed with this class (or a subclass of it)
+ *          must have the table row "id"!! The ID is the unique key to identify the elements.
+ *
+ * @ORM\MappedSuperclass()
+ */
+abstract class DBElement
+{
+
+    /** @var int The Identification number for this part. This value is unique for the element in this table.
+     * @ORM\Column(type="integer")
+     * @ORM\Id()
+     * @ORM\GeneratedValue()
+     */
+    protected $id;
+
+    /**
+     * Get the ID. The ID can be zero, or even negative (for virtual elements). If an elemenent is virtual, can be
+     * checked with isVirtualElement()
+     *
+     * @return integer the ID of this element
+     */
+    final public function getID() : int
+    {
+        return (int) $this->id;
+    }
+
+    /**
+     * Returns the ID as an string, defined by the element class.
+     * This should have a form like P000014, for a part with ID 14.
+     * @return string The ID as a string;
+     */
+    abstract public function getIDString() : string;
+
+}