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docs: add instructions for using a Cloud Spanner emulator #136

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merged 3 commits into from Aug 24, 2020
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docs: add instructions for using a Cloud Spanner emulator #136

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docs: add instructions for using a Cloud Spanner emulator
larkee Aug 19, 2020
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docs: address comment
larkee Aug 21, 2020
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Merge branch 'master' into add-instructions
larkee Aug 21, 2020
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23 changes: 23 additions & 0 deletions docs/client-usage.rst
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Expand Up @@ -50,6 +50,29 @@ Configuration

Be sure to use the **Project ID**, not the **Project Number**.

Using a Cloud Spanner Emulator
------------------------------

There are two ways to use the client with a Cloud Spanner emulator: programmatically or via an environment variable.

To programmatically use an emulator, you must specify the project, the endpoint of the emulator, and use anonymous credentials:

.. code:: python

from google.cloud import spanner
from google.auth.credentials import AnonymousCredentials

client = spanner.Client(
project='my-project',
client_options={"api_endpoint": "0.0.0.0:9010"},
credentials=AnonymousCredentials()
)

To use an emulator via an environment variable, set the `SPANNER_EMULATOR_HOST` environment variable to the emulator endpoint:

.. code::

export SPANNER_EMULATOR_HOST=0.0.0.0:9010

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