> 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/server-programming/spi/spi-interface/spi-spi-connect.md).

# SPI\_connect

### SPI\_connect

SPI\_connect, SPI\_connect\_ext — connect a C function to the SPI manager

### Synopsis

```

int SPI_connect(void)
```

```

int SPI_connect_ext(int options)
```

### Description

`SPI_connect` opens a connection from a C function invocation to the SPI manager. You must call this function if you want to execute commands through SPI. Some utility SPI functions can be called from unconnected C functions.

`SPI_connect_ext` does the same but has an argument that allows passing option flags. Currently, the following option values are available:

`SPI_OPT_NONATOMIC` : Sets the SPI connection to be *nonatomic*, which means that transaction control calls (`SPI_commit`, `SPI_rollback`) are allowed. Otherwise, calling those functions will result in an immediate error.

`SPI_connect()` is equivalent to `SPI_connect_ext(0)`.

### Return Value

`SPI_OK_CONNECT` : on success

The fact that these functions return `int` not `void` is historical. All failure cases are reported via `ereport` or `elog`. (In versions before PostgreSQL v10, some but not all failures would be reported with a result value of `SPI_ERROR_CONNECT`.)

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/spi-spi-connect.html)（英文原文，待翻譯）


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