Why doesn't pool work in PostgreSQL?

Question

PostgreSQL

Hey! I follow the instructions from the Internet, but it does not work. An error occurs after the select:

Error: Connection terminated
    at Connection.con.once (/Users/olegostashov/Documents/Study/PMIS/node_modules/pg/lib/client.js:170:29)
    at Object.onceWrapper (events.js:313:30)
    at emitNone (events.js:111:20)
    at Connection.emit (events.js:208:7)
    at Socket.<anonymous> (/Users/olegostashov/Documents/Study/PMIS/node_modules/pg/lib/connection.js:122:10)
    at emitNone (events.js:111:20)
    at Socket.emit (events.js:208:7)
    at endReadableNT (_stream_readable.js:1064:12)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)

What's wrong? I'm using node-postgres v7.4.1. The content of my app.js file is:

const express = require("express");
const bodyParser = require("body-parser");
const config = require("./config");
const pg = require("pg");
const pg_connect = {
  user: config.user,
  host: config.host,
  database: config.database,
  password: config.password,
  port: config.port_pg
};

const app = express();

app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({ extended: true }));

app.get("/", (req, res) => {
  var pool = new pg.Pool(pg_connect);
  const results = [];
  pool.connect(function(err, client, done) {
    if (err) {
      done();
      console.log(err);
      return res.status(500).json({ success: false, data: err });
    } else {
      client.query("SELECT * FROM users", (err, res) => {
        console.log(err);
      });
      done();
    }
    console.log(results);
    res.render("index", { users: results });
  });
  pool.end();
});

module.exports = app;

Answer 1

Возможно, кому-то понадобится. Удалил лишний pool.end() и перенес res.render().

app.get("/", (req, res) => {
  var pool = new pg.Pool(pg_connect);
  const results = [];
  pool.connect(function(err, client, done) {
    if (err) {
      console.log(err);
      done();
      return res.status(500).json({ success: false, data: err });
    } else {
      client
        .query("SELECT * FROM users")
        .then(result => {
          result.rows.forEach(function(item) {
            results.push(item);
          });
          res.render("index", { users: results });
        })
        .catch(err => console.log(err));
      done();
    }
  });
});