add visit log and counter

index.php

@@ -69,6 +69,17 @@
         $data = $stmt->fetchAll();
         if ($data) {
             $url = current($data)['url'];
+            $url_id = current($data)['id'];
+            $ip = get_client_ip();
+            $user_agent = $_SERVER['HTTP_USER_AGENT'];
+            $visit_count = current($data)['visit_count'] + 1;
+
+            $stmt = $db->prepare("update url set visit_count=? where id = ?");
+            $stmt->execute([$visit_count, $url_id]);
+
+            $stmt = $db->prepare("insert into visit_history(url_id, ip, user_agent) values (?, ?, ?)");
+            $stmt->execute([$url_id, $ip, $user_agent]);
+
             header("Location: {$url}");
         } else {
             header("Location: /");

mysql.db.sql

@@ -5,8 +5,19 @@ CREATE TABLE `url` (
   `url` text NOT NULL,
   `ip` varchar(32) NOT NULL,
   `user_agent` text,
+  `visit_count` int(11) NOT NULL DEFAULT 0,
   `create_date` datetime DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY (`id`),
   KEY `idx_code` (`code`),
   KEY `idx_hash` (`hash`)
-) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8mb4
+) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8mb4;
+
+CREATE TABLE `visit_history` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `url_id` int(11) NOT NULL,
+  `ip` varchar(32) NOT NULL,
+  `user_agent` text,
+  `create_date` datetime DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (`id`),
+  KEY `idx_url_id` (`url_id`)
+) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8mb4;