Add read_sql.py

Add example code for how to read from sql.
Signed-off-by: aoh <aoh@lysator.liu.se>

src/conf/read_sql.py

+#!/usr/bin/env python
+
+import mysql.connector
+from mysql.connector import errorcode
+
+try:
+  cnx = mysql.connector.connect(user='lysns',
+                                password='password',
+                                port='2223',
+                                host='hades',
+                                database='lysns')
+
+except mysql.connector.Error as err:
+  if err.errno == errorcode.ER_ACCESS_DENIED_ERROR:
+    print("Something is wrong with your user name or password")
+  elif err.errno == errorcode.ER_BAD_DB_ERROR:
+    print("Database does not exist")
+  else:
+    print(err)
+else:
+  cursor = cnx.cursor()
+
+  print("################################################################################")
+  print("Domain")
+  print("################################################################################")
+  query = ("SELECT id,name,uid,dirtybit,deletebit FROM domain")
+  cursor.execute(query)
+
+  for (id, name, uid, dirtybit, deletebit) in cursor:
+    print("{}, {}, {}, {}, {}".format(
+	  id, name, uid, dirtybit, deletebit))
+
+  print("################################################################################")
+  print("Record types")
+  print("################################################################################")
+  query = ("SELECT id,name FROM record_types")
+  cursor.execute(query)
+
+  for (id, name) in cursor:
+    print("{}, {}".format(
+	  id, name))
+
+  print("################################################################################")
+  print("Subdomain")
+  print("################################################################################")
+  query = ("SELECT id, name, ttl, class, rr, destination, domainid, dirtybit, deletebit FROM subdomain")
+
+  cursor.execute(query)
+
+  for (id, name, ttl, clas, rr, destination, domainid, dirtybit, deletebit) in cursor:
+    print("{}, {}, {}, {}, {}, {}, {}, {}".format(
+      id, name, ttl, clas, rr, destination, domainid, dirtybit, deletebit))
+
+  cursor.close()
+
+  cnx.close()