Provided by: postgresql-doc-9.1_9.1.3-2_all
SPI_saveplan - save a plan
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.
SPIPlanPtr plan the plan to be saved
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
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.