SPI_saveplan — save a prepared statement
SPIPlanPtr SPI_saveplan(SPIPlanPtr plan
)
SPI_saveplan
copies a passed statement (prepared by
SPI_prepare
) into memory that will not be freed
by SPI_finish
nor by the transaction manager,
and returns a pointer to the copied statement. This gives you the
ability to reuse prepared statements in the subsequent invocations of
your C function in the current session.
SPIPlanPtr plan
the prepared statement to be saved
Pointer to the copied statement; or 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 C function
The originally passed-in statement is not freed, so you might wish to do
SPI_freeplan
on it to avoid leaking memory
until SPI_finish
.
In most cases, SPI_keepplan
is preferred to this
function, since it accomplishes largely the same result without needing
to physically copy the prepared statement's data structures.