PostgreSQL 9.4.26 Documentation
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# SPI_connect

## Name

SPI_connect -- connect a procedure to the SPI manager

## Synopsis

    int SPI_connect(void)

## Description

`SPI_connect` opens a connection from a procedure 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 procedures.

If your procedure is already connected, `SPI_connect` will return the error code SPI_ERROR_CONNECT. This could happen if a procedure that has called `SPI_connect` directly calls another procedure that calls `SPI_connect`. While recursive calls to the SPI manager are permitted when an SQL command called through SPI invokes another function that uses SPI, directly nested calls to `SPI_connect` and `SPI_finish` are forbidden. (But see `SPI_push` and `SPI_pop`.)

## Return Value

`SPI_OK_CONNECT`

  on success

`SPI_ERROR_CONNECT`

  on error

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