Add mix lookup, genre support, DJ enhancements.

classes/Genres.php

@@ -0,0 +1,53 @@
+<?php
+
+class Genres
+{
+
+    private $db;
+    private $genres = [];
+
+    public function __construct($db)
+    {
+
+        $this->db = $db;
+        if (!$this->load_all_genres()) {
+            return false;
+        } else {
+            return true;
+        }
+
+    }
+
+    private function load_all_genres(): bool
+    {
+        $genres = $this->get_all_genres();
+        if ($genres) {
+            $this->genres = $genres;
+            return true;
+        } else {
+            return false;
+        }
+
+
+    }
+
+    public function get_all_genres($order = "ASC")
+    {
+        $stmt = $this->db->prepare("SELECT * FROM genres ORDER BY name $order");
+        $stmt->execute();
+        $result = $stmt->get_result();
+        $genres = $result->fetch_all(MYSQLI_ASSOC);
+        $stmt->close();
+        return $genres;
+    }
+
+    public function get_nonzero_genres()
+    {
+        $stmt = $this->db->prepare("SELECT * FROM genres WHERE count > 0 ORDER BY name ASC");
+        $stmt->execute();
+        $result = $stmt->get_result();
+        $genres = $result->fetch_all(MYSQLI_ASSOC);
+        $stmt->close();
+        return $genres;
+    }
+}