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The PostgreSQL 9.0 Reference Manual - Volume 2 - Programming Guide
by The PostgreSQL Global Development Group
Paperback (6"x9"), 478 pages
ISBN 9781906966065
RRP £14.95 ($19.95)

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13.1.26 SPI_saveplan

Name

SPI_saveplan -- save a plan

Synopsis

SPIPlanPtr SPI_saveplan(SPIPlanPtr plan)

Description

SPI_saveplan saves a passed plan (prepared by SPI_prepare) in memory that will not be freed by SPI_finish nor by the transaction manager, and returns a pointer to the saved plan. This gives you the ability to reuse prepared plans in the subsequent invocations of your procedure in the current session.

Arguments

SPIPlanPtr plan
the plan to be saved

Return Value

Pointer to the saved plan; NULL if unsuccessful. On error, SPI_result is set thus:

SPI_ERROR_ARGUMENT
if plan is NULL or invalid
SPI_ERROR_UNCONNECTED
if called from an unconnected procedure

Notes

The passed-in plan is not freed, so you might wish to do SPI_freeplan on it to avoid leaking memory until SPI_finish.

If one of the objects (a table, function, etc.) referenced by the prepared plan is dropped or redefined, then future executions of SPI_execute_plan may fail or return different results than the plan initially indicates.

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