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SPIPlanPtr SPI_saveplan(SPIPlanPtr plan)
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.
the plan to be saved
Pointer to the saved plan; NULL if unsuccessful. On error, SPI_result is set thus:
if plan is NULL or invalid
if called from an unconnected procedure
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.
