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Fix Spanner README. #3796

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Aug 11, 2017
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Fix Spanner README. #3796

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19 changes: 13 additions & 6 deletions spanner/README.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -57,20 +57,27 @@ as a callback to ``database.run_in_transaction``:
# The use of @parameters is recommended rather than doing your
# own string interpolation; this provides protections against
# SQL injection attacks.
query = """UPDATE people
SET anniversary = @uxts
query = """SELECT anniversary FROM people
WHERE id = @person_id"""

# When executing the SQL statement, the query and parameters are sent
# as separate arguments. When using parameters, you must specify
# both the parameters themselves and their types.
transaction.execute_sql(
row = transaction.execute_sql(
query=query,
params={'person_id': person_id, 'uxts': unix_timestamp},
params={'person_id': person_id},
param_types={
'person_id': types.INT64_PARAM_TYPE,
'uxts': types.INT64_PARAM_TYPE,
},
).one()

# Now perform an update on the data.
old_anniversary = row[0]
new_anniversary = _compute_anniversary(old_anniversary, years)
transaction.update(
'people',
['person_id', 'anniversary'],
[person_id, new_anniversary],
)

# Actually run the `update_anniversary` function in a transaction.
Expand Down Expand Up @@ -140,4 +147,4 @@ Learn More
See the ``google-cloud-python`` API `Cloud Spanner documentation`_ to learn how
to connect to Cloud Spanner using this Client Library.

.. _Cloud Spanner documentation: https://googlecloudplatform.github.io/google-cloud-python/latest/bigquery/usage.html
.. _Cloud Spanner documentation: https://googlecloudplatform.github.io/google-cloud-python/latest/spanner/usage.html