SPIPlanPtr SPI_prepare_cursor(const char * command, int nargs,
                              Oid * argtypes, int cursorOptions)   SPI_prepare_cursor is identical to
   SPI_prepare, except that it also allows specification
   of the planner's "cursor options" parameter.  This is a bit mask
   having the values shown in nodes/parsenodes.h
   for the options field of DeclareCursorStmt.
   SPI_prepare always takes the cursor options as zero.
  
command string
number of input parameters ($1, $2, etc.)
pointer to an array containing the OIDs of the data types of the parameters
integer bit mask of cursor options; zero produces default behavior