spec_meta_has_completed
dbHasCompleted() returns a logical scalar.
For a query initiated by DBI::dbSendQuery() with non-empty result set,
dbHasCompleted() returns FALSE initially
and TRUE after calling DBI::dbFetch() without limit.
For a query initiated by DBI::dbSendStatement(),
dbHasCompleted() always returns TRUE.
Attempting to query completion status for a result set cleared with
DBI::dbClearResult() gives an error.
The completion status for a query is only guaranteed to be set to
FALSE after attempting to fetch past the end of the entire result.
Therefore, for a query with an empty result set,
the initial return value is unspecified,
but the result value is TRUE after trying to fetch only one row.
Similarly, for a query with a result set of length n,
the return value is unspecified after fetching n rows,
but the result value is TRUE after trying to fetch only one more
row.
Other meta specifications:
spec_get_info,
spec_meta_bind,
spec_meta_column_info,
spec_meta_get_row_count,
spec_meta_get_rows_affected,
spec_meta_get_statement,
spec_meta_is_valid