Create table if needed

def _create_table():
    '''
    Create table if needed
    '''
    # Explicitely check if the table already exists as the library logs a
    # warning on CREATE TABLE
    query = """SELECT COUNT(TABLE_NAME) FROM information_schema.tables
        WHERE table_schema = '{0}' AND table_name = '{1}'""".format(
            _mysql_kwargs['db'],
            _table_name,
        )
    cur, _ = run_query(client, query)
    r = cur.fetchone()
    cur.close()
    if r[0] == 1:
        return

    query = """CREATE TABLE IF NOT EXISTS {0} (
      bank CHAR(255),
      etcd_key CHAR(255),
      data MEDIUMBLOB,
      PRIMARY KEY(bank, etcd_key)
    );""".format(_table_name)
    log.info("mysql_cache: creating table %s", _table_name)
    cur, _ = run_query(client, query)
    cur.close()