SPI_saveplan
Description
SPI_saveplan
copies a passed statement (prepared bySPI_prepare
) into memory that will not be freed bySPI_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 procedure in the current session.
Return Value
Pointer to the copied statement; orNULL if unsuccessful. On error,SPI_result is set thus:
- SPI_ERROR_ARGUMENT
ifplan isNULL or invalid
- SPI_ERROR_UNCONNECTED
if called from an unconnected procedure
Notes
The originally passed-in statement is not freed, so you might wish to doSPI_freeplan
on it to avoid leaking memory untilSPI_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.