SPI_MODIFYTUPLE(3)

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

SYNOPSIS

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

DESCRIPTION

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.

ARGUMENTS

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)

RETURN VALUE

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

On error, SPI_result is set as follows:

SPI_ERROR_ARGUMENT
    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.

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