PostgreSQL
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# SPI_execp

## Name

SPI_execp — Executes a plan from `SPI_saveplan`

    SPI_execp(plan,
    values,
    nulls,
    tcount)

### Inputs

void *`plan`

  Execution plan

Datum *`values`

  Actual parameter values

char *`nulls`

  Array describing what parameters get NULLs

  'n' indicates NULL allowed
  ' ' indicates NULL not allowed

int `tcount`

  Number of tuples for which plan is to be executed

### Outputs

int

  Returns the same value as `SPI_exec` as well as

  SPI_ERROR_ARGUMENT if `plan` is NULL or `tcount` < 0
  SPI_ERROR_PARAM if `values` is NULL and `plan` was prepared with some parameters.

SPI_tuptable

  initialized as in `SPI_exec` if successful

SPI_processed

  initialized as in `SPI_exec` if successful

## Description

`SPI_execp` stores a plan prepared by `SPI_prepare` in safe memory protected from freeing by `SPI_finish` or the transaction manager.

In the current version of Postgres there is no ability to store prepared plans in the system catalog and fetch them from there for execution. This will be implemented in future versions. As a work arround, there is the ability to reuse prepared plans in the consequent invocations of your procedure in the current session. Use `SPI_execp` to execute this saved plan.

## Usage

If `nulls` is NULL then `SPI_execp` assumes that all values (if any) are NOT NULL.

> Note: If one of the objects (a relation, function, etc.) referenced by the prepared plan is dropped during your session (by your backend or another process) then the results of `SPI_execp` for this plan will be unpredictable.

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SPI_saveplan | Up | Interface Support Functions