message: Added code example to the doc string for `SqlDataset`.
diff: @@ -2276,6 +2276,23 @@ class SqlDataset(Dataset):
  def __init__(self, driver_name, data_source_name, query, output_types):
  """Creates a `SqlDataset`.
  + `SqlDataset` allows a user to read data from the result set of a SQL query.
  + For example:
  +
  + ```python
  + dataset = tf.contrib.data.SqlDataset("sqlite", "/foo/bar.sqlite3",
  + "SELECT name, age FROM people",
  + (tf.string, tf.int32))
  + iterator = dataset.make_one_shot_iterator()
  + next_element = iterator.get_next()
  + # Prints the rows of the result set of the above query.
  + while True:
  + try:
  + print(sess.run(next_element))
  + except tf.errors.OutOfRangeError:
  + break
  + ```
  +
  Args:
  driver_name: A 0-D `tf.string` tensor containing the database type.
  Currently, the only supported value is 'sqlite'.
  