Provided by: postgresql-doc-10_10.23-0ubuntu0.18.04.2_all 
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.
RETURN VALUE
SPI_OK_CONNECT
on success
SPI_ERROR_CONNECT
on error