Provided by: postgresql-doc-9.1_9.1.3-2_all bug


       SPI_modifytuple - create a row by replacing selected fields of a given row


       HeapTuple SPI_modifytuple(Relation rel, HeapTuple row, int ncols,
                                 int * colnum, Datum * values, const char * nulls)


       SPI_modifytuple creates a new row by substituting new values for selected columns, copying
       the original row's columns at other positions. The input row is not modified.


       Relation rel
           Used only as the source of the row descriptor for the row. (Passing a relation rather
           than a row descriptor is a misfeature.)

       HeapTuple row
           row to be modified

       int ncols
           number of column numbers in the array colnum

       int * colnum
           array of the numbers of the columns that are to be changed (column numbers start at 1)

       Datum * values
           new values for the specified columns

       const char * Nulls
           which new values are null, if any (see SPI_execute_plan for the format)


       new row with modifications, allocated in the upper executor context; NULL only if row is

       On error, SPI_result is set as follows:

           if rel is NULL, or if row is NULL, or if ncols is less than or equal to 0, or if
           colnum is NULL, or if values is NULL.

           if colnum contains an invalid column number (less than or equal to 0 or greater than
           the number of column in row)