code: def __delete_internal_blob(self, key):
          ''' This method will insert blob data to blob table
          '''
          with self.get_conn() as conn:
              conn.isolation_level = None
              try:
                  c = conn.cursor()
                  c.execute("BEGIN")
                  if key is None:
                      c.execute("DELETE FROM cache_entries WHERE key IS NULL")
                      c.execute("DELETE FROM blob_entries WHERE KEY IS NULL")
                  else:
                      c.execute("DELETE FROM cache_entries WHERE key = ?", (key,))
                      c.execute("DELETE FROM blob_entries WHERE KEY = ?", (key,))
                  c.execute("COMMIT")
              except:
                  getLogger().debug("Cannot delete")
                  return False
              return Truf __delete_internal_blob(self, key):
          ''' This method will insert blob data to blob table
          '''
          with self.get_conn() as conn:
              conn.isolation_level = None
              try:
                  c = conn.cursor()
                  c.execute("BEGIN")
                  if key is None:
                      c.execute("DELETE FROM cache_entries WHERE key IS NULL")
                      c.execute("DELETE FROM blob_entries WHERE KEY IS NULL")
                  else:
                      c.execute("DELETE FROM cache_entries WHERE key = ?", (key,))
                      c.execute("DELETE FROM blob_entries WHERE KEY = ?", (key,))
                  c.execute("COMMIT")
              except:
                  getLogger().debug("Cannot delete")
                  return False
              return True
docs: This method will insert blob data to blob table