SPI_keepplan — save a prepared statement
int SPI_keepplan(SPIPlanPtr plan) SPI_keepplan saves a passed statement (prepared by
SPI_prepare) so that it will not be freed
by SPI_finish nor by the transaction manager.
This gives you the ability to reuse prepared statements in the subsequent
invocations of your procedure in the current session.
SPIPlanPtr planthe prepared statement to be saved
0 on success;
SPI_ERROR_ARGUMENT if plan
is NULL or invalid
The passed-in statement is relocated to permanent storage by means
of pointer adjustment (no data copying is required). If you later
wish to delete it, use SPI_freeplan on it.