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Class ProfileDmlResult (2.26.0)
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Version 2.26.0 keyboard_arrow_down
This class encapsulates the result of a Cloud Spanner DML operation, i.e., INSERT
, UPDATE
, or DELETE
.
Note:
ProfileDmlResult
returns the number of rows modified, execution statistics, and query plan.
Example:
spanner::ProfileDmlResult dml_result;
auto commit_result = client.Commit(
[&client,
&dml_result](spanner::Transaction txn) -> StatusOr<spanner::Mutations> {
auto update = client.ProfileDml(
std::move(txn),
spanner::SqlStatement(
"UPDATE Albums SET MarketingBudget = MarketingBudget * 2"
" WHERE SingerId = 1 AND AlbumId = 1"));
if (!update) return std::move(update).status();
dml_result = *std::move(update);
return spanner::Mutations{};
});
if (!commit_result) throw std::move(commit_result).status();
// Stats only available after statement has been executed.
std::cout << "Rows modified: " << dml_result.RowsModified();
auto execution_stats = dml_result.ExecutionStats();
if (execution_stats) {
for (auto const& stat : *execution_stats) {
std::cout << stat.first << ":\t" << stat.second << "\n";
}
}
Constructors
ProfileDmlResult()
ProfileDmlResult(std::unique_ptr< ResultSourceInterface >)
Parameter
Name
Description
source
std::unique_ptr< ResultSourceInterface >
ProfileDmlResult(ProfileDmlResult &&)
Parameter
Name
Description
ProfileDmlResult &&
Operators
operator=(ProfileDmlResult &&)
Parameter
Name
Description
ProfileDmlResult &&
Returns
Type
Description
ProfileDmlResult &
Functions
RowsModified() const
Returns the number of rows modified by the DML statement.
Note:
Partitioned DML only provides a lower bound of the rows modified, all other DML statements provide an exact count.
Returns
Type
Description
std::int64_t
ExecutionStats() const
Returns a collection of key value pair statistics for the SQL statement execution.
Note:
Only available when the SQL statement is executed.
Returns
Type
Description
absl::optional< std::unordered_map< std::string, std::string > >
ExecutionPlan() const
Returns the plan of execution for the SQL statement.
Returns
Type
Description
absl::optional< spanner::ExecutionPlan >
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Last updated 2024-10-30 UTC.
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