From f362d7b2a0ebe9c90f2f2b319c542e66bf193ff4 Mon Sep 17 00:00:00 2001
From: Felix <felix@ffhartmann.de>
Date: Mon, 16 May 2022 18:48:55 +0200
Subject: [PATCH] allow to reset database

---
 Database.cs | 9 ++++++---
 Form1.cs    | 1 +
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/Database.cs b/Database.cs
index b1e929a..75959e6 100644
--- a/Database.cs
+++ b/Database.cs
@@ -17,7 +17,7 @@ namespace it_projekt
             {
                 connection.Open();
 
-                string sql = "SELECT stammdaten.id, stammdaten.firstname, stammdaten.lastname, stammdaten.creationdate, abteilung.kuerzel, abteilung.name FROM `stammdaten` JOIN abteilung GROUP BY stammdaten.id; ";
+                string sql = "SELECT stammdaten.id,stammdaten.firstname, stammdaten.lastname, stammdaten.creationdate, abteilung.kuerzel, abteilung.name FROM `stammdaten` JOIN abteilung WHERE abteilungs_id = abteilung.id;";
                 MySqlCommand cmd = new MySqlCommand(sql, connection);
                 MySqlDataReader rdr = cmd.ExecuteReader();
                 Persons = new List<Person>();
@@ -33,9 +33,7 @@ namespace it_projekt
             {
                 Console.WriteLine(ex.ToString());
             }
-
             connection.Close();
-            Console.WriteLine("Done.");
         }
 
         public static Database getDatabase(string username, string password)
@@ -46,5 +44,10 @@ namespace it_projekt
             }
             return _database;
         }
+
+        public static void resetDatabase()
+        {
+            _database = null;
+        }
     }
 }
diff --git a/Form1.cs b/Form1.cs
index 1f505c6..3eb2350 100644
--- a/Form1.cs
+++ b/Form1.cs
@@ -39,6 +39,7 @@ namespace it_projekt
             db = Database.getDatabase(user, password);
             if (db.Persons == null)
             {
+                Database.resetDatabase();
                 MessageBox.Show("Connection to Database failed! \nPlease Try again.", "Database Error!");
             }
             else {