Data is now actually refreshed in refresh() method

Before this commit, the MySQL connection stayed open during the whole lifetime of the Admidio object. Because of that, new data in the database could not be acquired by the refresh() method. Furthermore, the object would crash when the connection got lost.

Now, the connection is created at the start of refresh() and disconnected after refresh().

admidio.py

@@ -13,14 +13,21 @@ class Admidio:
 
     def __init__(self, mysql_host, mysql_user, mysql_pass, mysql_db,
                  db_prefix):
-        self.db = MySQLdb.connect(
-            host=mysql_host, user=mysql_user, passwd=mysql_pass, db=mysql_db)
-        self.cursor = self.db.cursor()
+        self.mysql_host = mysql_host
+        self.mysql_user = mysql_user
+        self.mysql_pass = mysql_pass
+        self.mysql_db = mysql_db
+
         self.prefix = db_prefix
+
         self.members = dict()
         self.groups = dict()
         self.events = dict()
+
         self.event_confirmation_id = None
+
+        self.connect_db()
+
         sql = f"SELECT usf_id,usf_name_intern FROM {self.prefix}_user_fields"
         self.cursor.execute(sql)
         self.userfields = dict(self.cursor.fetchall())
@@ -34,25 +41,37 @@ class Admidio:
         self.cursor.execute(sql)
         self.event_confirmation_id = self.cursor.fetchone()[0]
 
-        self.initMembers()
-        self.initGroups()
-        self.initEvents()
-        self.ready = True
+        self.db.close()
+
+        self.refresh()
 
     def __del__(self):
-        self.db.close()
+        pass
+
+    def connect_db(self):
+        self.db = MySQLdb.connect(
+            host=self.mysql_host,
+            user=self.mysql_user,
+            passwd=self.mysql_pass,
+            db=self.mysql_db)
+
+        self.cursor = self.db.cursor()
 
     def refresh(self):
         """Refresh all users, groups and events that are stored"""
+        self.connect_db()
+
         self.ready = False
-        self.members = dict()
-        self.groups = dict()
-        self.events = dict()
+        self.members.clear()
+        self.groups.clear()
+        self.events.clear()
         self.initMembers()
         self.initGroups()
         self.initEvents()
         self.ready = True
 
+        self.db.close()
+
     def initMembers(self):
         """Initialises all members in the Admidio installation"""