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Showing content from https://cloud.google.com/cpp/docs/reference/spanner/2.12.0/spanner-auth-example below:

C++ Client Libraries | Google Cloud

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Override the authentication configuration

You can override this default using google::cloud::UnifiedCredentialsOption. The following example shows how to explicitly load a service account key file.

  namespace spanner = ::google::cloud::spanner;
  [](std::string const& project_id, std::string const& instance_id,
     std::string const& database_id, std::string const& keyfile) {
    auto is = std::ifstream(keyfile);
    is.exceptions(std::ios::badbit);
    auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
    auto options =
        google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
            google::cloud::MakeServiceAccountCredentials(contents));
    return spanner::Client(spanner::MakeConnection(
        spanner::Database(project_id, instance_id, database_id), options));
  }

Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the [Best practices for managing service account keys] guide for more details.

Follow these links to find examples for other *Client classes:

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The latest release candidate version is 2.37.0-rc, and it is listed with the most recent updates."],["This page documents various versions of the Spanner C++ client library, starting from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["Users can override the default authentication configuration using `google::cloud::UnifiedCredentialsOption`, as demonstrated in the provided code snippet."],["The document provides links to examples for `DatabaseAdminClient` and `InstanceAdminClient`, highlighting how to use service account credentials with these client classes in version 2.12.0."],["The page contains a link for the `spanner-auth-example` for each version listed from 2.11.0 to 2.37.0-rc."]]],[]]

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