Upgrade to some new nextcloud standards

lib/Db/ColorMapper.php

@@ -0,0 +1,39 @@
+<?php
+namespace OCA\QuickNotes\Db;
+
+use OCP\IDBConnection;
+use OCP\AppFramework\Db\Mapper;
+use OCP\AppFramework\Db\DoesNotExistException;
+
+class ColorMapper extends Mapper {
+
+	public function __construct(IDBConnection $db) {
+		parent::__construct($db, 'quicknotes_colors', '\OCA\QuickNotes\Db\Color');
+	}
+
+	public function find($id) {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_colors WHERE id = ?';
+		return $this->findEntity($sql, [$id]);
+	}
+
+	public function findAll() {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_colors';
+		return $this->findEntities($sql, []);
+	}
+
+	public function findByColor($color) {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_colors WHERE color = ?';
+		return $this->findEntity($sql, [$color]);
+	}
+
+	public function colorExists($color) {
+		$sql = 'SELECT * FROM *PREFIX*quicknotes_colors WHERE color = ?';
+		try {
+			$this->findEntity($sql, [$color]);
+		} catch (DoesNotExistException $e) {
+			return false;
+		}
+		return true;
+	}
+
+}