The number of fields in a single tuple of the result set.
* public (readonly) int $affectedRows
The number of rows affected by a statement.
+* public (readonly) array $diag
+ Error details. See [PQresultErrorField](https://www.postgresql.org/docs/current/static/libpq-exec.html#LIBPQ-PQRESULTERRORFIELD) docs.
* public int $fetchType = pq\Result::FETCH_ARRAY
The [type of return value](pq/Result#Fetch.types:) the fetch methods should return when no fetch type argument was given. Defaults to pq\Connection::$defaultFetchType.
* public int $autoConvert = pq\Result::CONV_ALL