add basich sharing functionality logic

db/notesharemapper.php

@@ -0,0 +1,28 @@
+<?php
+namespace OCA\QuickNotes\Db;
+
+use OCP\IDb;
+use OCP\AppFramework\Db\Mapper;
+use OCP\AppFramework\Db\DoesNotExistException;
+
+class NoteShareMapper extends Mapper {
+
+	public function __construct(IDb $db) {
+		parent::__construct($db, 'quicknotes_notes', '\OCA\QuickNotes\Db\NoteShare');
+	}
+
+	/*public function find($id, $userId) {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_shares WHERE id = ? AND user_id = ?';
+		return $this->findEntity($sql, [$id, $userId]);
+	}*/
+
+	public function findForUser($userId) {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_shares WHERE shared_user = ?';
+		return $this->findEntities($sql, [$userId]);
+	}
+
+	public function findForGroup($groupId) {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_shares WHERE shared_group = ?';
+		return $this->findEntities($sql, [$groupId]);
+	}
+}