更新一些数据库写法

Ramitta/Ramitta.cs

@@ -381,5 +381,14 @@ namespace Ramitta.lib
                 return stringBuilder.ToString();
             }
         }
+
+        /// <summary>
+        /// 生成一个新的UUID/GUID
+        /// </summary>
+        /// <returns>格式为: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx</returns>
+        public static string GenerateUUID()
+        {
+            return Guid.NewGuid().ToString();
+        }
     }
 }