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Showing content from https://cloud.google.com/cpp/docs/reference/spanner/2.27.0/spanner-auth-example below:

C++ Client Libraries | Google Cloud

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Override the authentication configuration

Some applications cannot use the default authentication mechanism (known as [Application Default Credentials]). 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."],[[["This page provides access to documentation for various versions of the Spanner C++ client library, ranging from version 2.11.0 up to the release candidate 2.37.0-rc."],["The latest version of the Spanner C++ client library available is the release candidate 2.37.0-rc, with a link to it."],["The content includes an example of how to override the default authentication mechanism for the Spanner client using a service account key file."],["There are links provided to additional examples for `DatabaseAdminClient` and `InstanceAdminClient` that demonstrate service account usage in version 2.27.0."]]],[]]

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