SPI_is_cursor_plan
Name
SPI_is_cursor_plan -- returntrue if a statement prepared bySPI_prepare can be used withSPI_cursor_openDescription
SPI_is_cursor_plan returnstrue if a statement prepared bySPI_prepare can be passed as an argument toSPI_cursor_open, orfalse if that is not the case. The criteria are that theplan represents one single command and that this command returns tuples to the caller; for example,SELECT is allowed unless it contains anINTO clause, andUPDATE is allowed only if it contains aRETURNING clause.
Return Value
true orfalse to indicate if theplan can produce a cursor or not, withSPI_result set to zero. If it is not possible to determine the answer (for example, if theplan isNULL or invalid, or if called when not connected to SPI), thenSPI_result is set to a suitable error code andfalse is returned.