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PostgreSQL Reference Manual - Volume 2 - Programming Guide
by The PostgreSQL Global Development Group
Paperback (6"x9"), 408 pages
ISBN 0954612035
RRP £19.95 ($34.95)

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13.3.5 SPI_returntuple

Name

SPI_returntuple -- prepare to return a tuple as a Datum

Synopsis

HeapTupleHeader SPI_returntuple(HeapTuple row, TupleDesc rowdesc)

Description

SPI_returntuple makes a copy of a row in the upper executor context, returning it in the form of a row type Datum. The returned pointer need only be converted to Datum via PointerGetDatum before returning.

Note that this should be used for functions that are declared to return composite types. It is not used for triggers; use SPI_copytuple for returning a modified row in a trigger.

Arguments

HeapTuple row
row to be copied
TupleDesc rowdesc
descriptor for row (pass the same descriptor each time for most effective caching)

Return Value

HeapTupleHeader pointing to copied row; NULL only if row or rowdesc is NULL

ISBN 0954612035PostgreSQL Reference Manual - Volume 2 - Programming GuideSee the print edition