SPI_saveplan

## Name

SPI_saveplan — save a plan

## Synopsis

    void * SPI_saveplan(void * plan)

## Description

`SPI_saveplan` saves a passed plan (prepared by `SPI_prepare`) in memory protected from freeing by `SPI_finish` and 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. You may save the pointer returned in a local variable. Always check if this pointer is `NULL` or not either when preparing a plan or using an already prepared plan in `SPI_execute_plan`.

## Arguments

`void * `plan``

  the plan to be saved

## Return Value

Pointer to the saved plan; `NULL` if unsuccessful. On error, `SPI_result` is set thus:

`SPI_ERROR_ARGUMENT`

  if `plan` is `NULL`

`SPI_ERROR_UNCONNECTED`

  if called from an unconnected procedure

## Notes

If one of the objects (a table, function, etc.) referenced by the prepared plan is dropped during the session then the results of `SPI_execute_plan` for this plan will be unpredictable.