Обсуждение: [GENERAL] Accessiing database from inside of postgresql C function

Yan Pas <yanp.bugz@gmail.com> writes:
> I'm writing C postgresql module with postgresql functions and want to
> access the tables from inside (SELECT mostly and maybe INSERT). Is it
> possible? If yes what API can I use except classic TCP connection (not sure
> if it's even legal)?

Recommended way is to use SPI:
https://www.postgresql.org/docs/current/static/spi.html

Aside from that documentation, there are lots of examples to study in the
core code and contrib.

            regards, tom lane