> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/15/server-programming/server-programming-interface/spi-interface/spi-spi-register-trigger-data.md).

# SPI\_register\_trigger\_data

## SPI\_register\_trigger\_data

SPI\_register\_trigger\_data — make ephemeral trigger data available in SPI queries

### Synopsis

```

int SPI_register_trigger_data(TriggerData *tdata)
```

### Description

`SPI_register_trigger_data` makes any ephemeral relations captured by a trigger available to queries planned and executed through the current SPI connection. Currently, this means the transition tables captured by an `AFTER` trigger defined with a `REFERENCING OLD/NEW TABLE AS` ... clause. This function should be called by a PL trigger handler function after connecting.

### Arguments

`TriggerData *`*`tdata`*

the `TriggerData` object passed to a trigger handler function as `fcinfo->context`

### Return Value

If the execution of the command was successful then the following (nonnegative) value will be returned:

`SPI_OK_TD_REGISTER`

if the captured trigger data (if any) has been successfully registered

On error, one of the following negative values is returned:

`SPI_ERROR_ARGUMENT`

if *`tdata`* is `NULL`

`SPI_ERROR_UNCONNECTED`

if called from an unconnected C function

`SPI_ERROR_REL_DUPLICATE`

if the name of any trigger data transient relation is already registered for this connection

***

原文：[PostgreSQL 15.19 Documentation](/15/server-programming/server-programming-interface/spi-interface/spi-spi-register-trigger-data.md)（英文原文，待翻譯）


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