SPI_push (3)
Leading comments
Title: SPI_push
Author: The PostgreSQL Global Development Group
Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
Date: 2017
Manual: PostgreSQL 9.6.5 Documentation
Source: PostgreSQL 9.6.5
Language: English
NAME
SPI_push - push SPI stack to allow recursive SPI usageSYNOPSIS
void SPI_push(void)
DESCRIPTION
SPI_push should be called before executing another procedure that might itself wish to use SPI. After SPI_push, SPI is no longer in a lqconnectedrq state, and SPI function calls will be rejected unless a fresh SPI_connect is done. This ensures a clean separation between your procedure's SPI state and that of another procedure you call. After the other procedure returns, call SPI_pop to restore access to your own SPI state.
Note that SPI_execute and related functions automatically do the equivalent of SPI_push before passing control back to the SQL execution engine, so it is not necessary for you to worry about this when using those functions. Only when you are directly calling arbitrary code that might contain SPI_connect calls do you need to issue SPI_push and SPI_pop.