add mieter, refactor to getOne and getMany

dbpool.py

@@ -26,3 +26,37 @@ def createConnectionPool():
 def getConnection():
     global pool
     return pool.get_connection()
+
+
+def getMany(stmt):
+    try:
+        dbh = getConnection()
+        objs = []
+        cur = dbh.cursor(dictionary=True)
+        cur.execute(stmt)
+        for obj in cur:
+            objs.append(obj)
+        return objs
+    except Exception as err:
+        return str(err), 500
+    finally:
+        dbh.close()
+
+
+def getOne(stmt, params, objName):
+    try:
+        dbh = getConnection()
+        cur = dbh.cursor(dictionary=True)
+        cur.execute(stmt, params)
+        obj = cur.next()
+        if not obj:
+            return "{} not found".format(objName), 404
+        invObj = cur.next()
+        if invObj:
+            return "More than one {} by that id ({}, {})".format(objName, id, invObj), 500
+        return obj
+    except Exception as err:
+        return str(err), 500
+    finally:
+        dbh.close()
+