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Returns the number of rows affected by the executed SQL statement.
std::uint64_t affected_rows() const noexcept;
Note that this is NOT the number of matched rows. If a row is matched but not affected, it won't be accounted for here.
For operations returning more than one resultset, returns the first resultset's affected rows.
this->has_value()
== true
No-throw guarantee.
Constant.