SPI_scroll_cursor_fetch — fetch some rows from a cursor
void SPI_scroll_cursor_fetch(Portalportal, FetchDirectiondirection, longcount)
SPI_scroll_cursor_fetch fetches some rows from a
cursor. This is equivalent to the SQL command FETCH.
Portal portalportal containing the cursor
FetchDirection direction one of FETCH_FORWARD,
FETCH_BACKWARD,
FETCH_ABSOLUTE or
FETCH_RELATIVE
long count number of rows to fetch for
FETCH_FORWARD or
FETCH_BACKWARD; absolute row number to fetch for
FETCH_ABSOLUTE; or relative row number to fetch for
FETCH_RELATIVE
SPI_processed and
SPI_tuptable are set as in
SPI_execute if successful.
See the SQL FETCH command
for details of the interpretation of the
direction and
count parameters.
Direction values other than FETCH_FORWARD
may fail if the cursor's plan was not created
with the CURSOR_OPT_SCROLL option.