def initFromDB(self, mysql, sql, family, id_name, val_name):
cursor = mysql.cursor(MySQLdb.cursors.DictCursor)
cursor.execute(sql)
inserting = defaultdict(dict)
for row in cursor.fetchall():
val = row[val_name]
id = pack(row[id_name])
inserting[id][val] = val
fam = ColumnFamily(self.connection, family)
fam.truncate()
logging.info('Initializing %s' % family)
fam.batch_insert(inserting)
