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Merged
scotthart merged 2 commits into from
Jan 9, 2026
Merged

doc(spanner): update sample implementation to match description #15871

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5f83740
doc(spanner): update sample implementation to match description
scotthart Jan 9, 2026
c7d8865
update error message and error handling
scotthart Jan 9, 2026
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12 changes: 10 additions & 2 deletions google/cloud/spanner/samples/samples.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -3426,6 +3426,8 @@ void ReadDataWithStoringIndex(google::cloud::spanner::Client client) {
//! [START spanner_read_write_transaction]
void ReadWriteTransaction(google::cloud::spanner::Client client) {
namespace spanner = ::google::cloud::spanner;
using ::google::cloud::Status;
using ::google::cloud::StatusCode;
using ::google::cloud::StatusOr;

// A helper to read a single album MarketingBudget.
Expand All @@ -3442,15 +3444,21 @@ void ReadWriteTransaction(google::cloud::spanner::Client client) {
return std::get<0>(*std::move(row));
};

auto constexpr kInsufficientFundsMessage =
"The second album does not have enough funds to transfer";
auto commit = client.Commit(
[&client, &get_current_budget](
spanner::Transaction const& txn) -> StatusOr<spanner::Mutations> {
[&](spanner::Transaction const& txn) -> StatusOr<spanner::Mutations> {
auto b1 = get_current_budget(client, txn, 1, 1);
if (!b1) return std::move(b1).status();
auto b2 = get_current_budget(client, txn, 2, 2);
if (!b2) return std::move(b2).status();
std::int64_t transfer_amount = 200000;

if (*b2 < transfer_amount) {
return Status(StatusCode::kFailedPrecondition,
kInsufficientFundsMessage);
}

return spanner::Mutations{
spanner::UpdateMutationBuilder(
"Albums", {"SingerId", "AlbumId", "MarketingBudget"})
Expand Down