add mieter, refactor to getOne and getMany

Mieter.py

@@ -0,0 +1,44 @@
+from dbpool import getConnection, getMany, getOne
+
+def get_mieters():
+    return getMany("""
+SELECT m.id as id, 
+       o.id as objekt_id,
+       w.id as wohnung_id,
+       w.shortname as wohnung, 
+       o.shortname as objekt,
+       COALESCE(m.anrede, '-') as anrede,
+       COALESCE(m.vorname, '-') as vorname,
+       m.nachname as nachname,
+       COALESCE(m.strasse, '-') as strasse,
+       COALESCE(m.plz, '-') as plz,
+       COALESCE(m.ort, '-') as ort,
+       COALESCE(m.telefon, '-') as telefon,
+       m.einzug as einzug,
+       COALESCE(m.auszug, '-') as auszug
+  FROM wohnung w, objekt o, mieter m
+  WHERE o.id = w.objekt AND
+        w.id = m.wohnung
+    """)
+
+def get_mieter(id=None):
+    return getOne("""
+SELECT m.id as id, 
+       o.id as objekt_id,
+       w.id as wohnung_id,
+       w.shortname as wohnung, 
+       o.shortname as objekt,
+       COALESCE(m.anrede, '-') as anrede,
+       COALESCE(m.vorname, '-') as vorname,
+       m.nachname as nachname,
+       COALESCE(m.strasse, '-') as strasse,
+       COALESCE(m.plz, '-') as plz,
+       COALESCE(m.ort, '-') as ort,
+       COALESCE(m.telefon, '-') as telefon,
+       m.einzug as einzug,
+       COALESCE(m.auszug, '-') as auszug
+  FROM wohnung w, objekt o, mieter m
+  WHERE o.id = w.objekt AND
+        w.id = m.wohnung AND
+        m.id = ?
+""", (id, ), "Mieter")