SPI_saveplan
SPI_saveplan
SPI_saveplan - save a prepared statement
Synopsis
SPIPlanPtr SPI_saveplan(SPIPlanPtr plan)
Description
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.
Arguments
-
SPIPlanPtrplan -
the prepared statement to be saved
Return Value
Pointer to the copied statement; or
NULL
if unsuccessful.
On error,
SPI_result
is set thus:
-
SPI_ERROR_ARGUMENT -
if
planisNULLor invalid -
SPI_ERROR_UNCONNECTED -
if called from an unconnected C function
Notes
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.