SPI_saveplan saves a passed plan (prepared by SPI_prepare) in memory protected from freeing by SPI_finish and 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. You may save the pointer returned in a local variable. Always check if this pointer is NULL or not either when preparing a plan or using an already prepared plan in SPI_execp.
Arguments
void * 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
SPI_ERROR_UNCONNECTED
if called from an unconnected procedure
Notes
If one of the objects (a table, function, etc.) referenced by the prepared plan is dropped during the session then the results of SPI_execp for this plan will be unpredictable.
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