PostgreSQL

SPI_execute_extended
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SPI_execute_extended

SPI_execute_extended — execute a command with out-of-line parameters

Synopsis

int SPI_execute_extended(const char *command,
                         const SPIExecuteOptions * options)

Description

SPI_execute_extended executes a command that might include references to externally supplied parameters. The command text refers to a parameter as $`n, and the options->params object (if supplied) provides values and type information for each such symbol. Various execution options can be specified in the options` struct, too.

The `options->params object should normally mark each parameter with the `PARAM_FLAG_CONST flag, since a one-shot plan is always used for the query.

If `options->dest is not NULL, then result tuples are passed to that object as they are generated by the executor, instead of being accumulated in `SPI_tuptable. Using a caller-supplied DestReceiver object is particularly helpful for queries that might generate many tuples, since the data can be processed on-the-fly instead of being accumulated in memory.

Arguments

`const char * +`_`+command`_: command string
`const SPIExecuteOptions * +`_`+options`_: struct containing optional arguments

Callers should always zero out the entire `options struct, then fill whichever fields they want to set. This ensures forward compatibility of code, since any fields that are added to the struct in future will be defined to behave backwards-compatibly if they are zero. The currently available options` fields are:

`ParamListInfo +`_`+params`_: data structure containing query parameter types and values; NULL if none
`bool +`_`+read_only`_: true for read-only execution
`bool +`_`+allow_nonatomic`_: true allows non-atomic execution of CALL and DO statements
`bool +`_`+must_return_tuples`_: if true, raise error if the query is not of a kind that returns tuples (this does not forbid the case where it happens to return zero tuples)
`uint64 +`_`+tcount`_: maximum number of rows to return, or 0 for no limit
`DestReceiver * +`_`+dest`_: DestReceiver object that will receive any tuples emitted by the query; if NULL, result tuples are accumulated into a SPI_tuptable structure, as in SPI_execute
`ResourceOwner +`_`+owner`_: This field is present for consistency with SPI_execute_plan_extended, but it is ignored, since the plan used by SPI_execute_extended is never saved.

Return Value

The return value is the same as for SPI_execute.

When `options->dest is NULL, `SPI_processed and SPI_tuptable are set as in SPI_execute. When `options->dest is not NULL, `SPI_processed is set to zero and SPI_tuptable is set to NULL. If a tuple count is required, the caller’s DestReceiver object must calculate it.

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