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##### results::affected_rows

Returns the number of rows affected by the executed SQL statement.

###### Synopsis

    std::uint64_t
    affected_rows() const noexcept;

###### Description

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.

###### Preconditions

`this->has_value() == true`

###### Exception safety

No-throw guarantee.

###### Complexity

Constant.