LuaSQL

Use this for connecting to databases in lua - https://keplerproject.github.io/luasql/index.html - I used to use pgmoon and some others but the above is much better and supports scram-sha-256

Install

apt install postgresql-server-dev-13  # I think we need ths
sudo luarocks PGSQL_INCDIR=/usr/include/postgresql/ install luasql-postgres

Postgres

#!/usr/bin/env lua5.1
local driver = require "luasql.postgres"
env = assert (driver.postgres())
con = assert (env:connect("dbname=unode port=44441 user=someadmin password=somepass"))
res = con:execute"DROP TABLE people"
res = assert (con:execute[[
  CREATE TABLE people(
    name  varchar(50),
    email varchar(50)
  )
]])
list = {
  { name="Jose das Couves", email="jose@couves.com", },
  { name="Manoel Joaquim", email="manoel.joaquim@cafundo.com", },
  { name="Maria das Dores", email="maria@dores.com", },
}
for i, p in pairs (list) do
  res = assert (con:execute(string.format([[
    INSERT INTO people
    VALUES ('%s', '%s')]], p.name, p.email)
  ))
end
cur = assert (con:execute"SELECT name, email from people")
row = cur:fetch ({}, "a")
while row do
  print(string.format("Name: %s, E-mail: %s", row.name, row.email))
  row = cur:fetch (row, "a")
end
cur:close() -- already closed because all the result set was consumed
con:close()
env:close()