I am pretty new to heroku and node. While I was trying to connect to heroku db, the following error shows up.
Error: connect ECONNREFUSED 127.0.0.1:5432
I am using connection pooling:
var pg = require('pg');
var heroconfig =process.env.DATABASE_URL || "postgres://jykyslkwkdsvhz:3ba43ff7db0c8dv9a914bac02f55ce944d8ccec31b67f858df3a858faa386c8e#ec2-54-243-214-198.compute-1.amazonaws.com:5432/dfiijlh3fbe3g9";
//var pool1 = new Pool(heroconfig);
var pool1 = new Pool(heroconfig);
app.get('/db', function(req, res){
pool1.query('SELECT * FROM test_table;',function(err, result){
if(err){
res.status(500).send(err.toString());
} else{
res.send(JSON.stringify(result.rows));
}
});
});
I tried to look at similar questions form other users but could not find solution involving pooling.
Please help.
I figured it out partially,
Storing the configuration data as object as below makes it works
var heroconfig = {
user: 'username',
database: 'database name',
password: 'some pass word',
host: 'host name',
port: 5432,
max: 10,
idleTimeoutMillis: 30000,
};
However while using the line of code mentioned in my original question, where database url is stored into the variable, it is not working:
var heroconfig =process.env.DATABASE_URL || "postgres://jykyslkwkdsvhz:3ba43ff7db0c8dv9a914bac02f55ce944d8ccec31b67f858df3a858faa386c8e#ec2-54-243-214-198.compute-1.amazonaws.com:5432/dfiijlh3fbe3g9";
I am planning to store my credentials in a different file and require it in my server file which seems to be a better approach.
I know this is late, but according to the docs in order to use a connection string, you must do this:
const { Pool, Client } = require('pg')
const connectionString = 'postgresql://dbuser:secretpassword#database.server.com:3211/mydb'
const pool = new Pool({
connectionString: connectionString,
})
See here: https://node-postgres.com/features/connecting#connection-uri
I have had such an error. After a lot of hours of research, I found out that my server deployed to Heroku was trying to access my PC PostgreSQL database. But it should have connected to the added-on PostgreSQL database in Heroku. I mean my server wasn't connecting to the database link in production mode, it was connecting to the database in development mode. I fixed it in my code like this.
db.js contents:
// focus on const environment
const environment = process.env.NODE_ENV || "development";
const knex = require("knex");
const knexfile = require("./knexfile");
const db = knex(knexfile[environment]);
module.exports = db;
Related
I am trying to migrate my google cloud app engine from Redis 3.x to 4.x. However, it appears that there have been some major changes in Redis 4.x. It appears that the client no longer autoconnect and there have been some chnages to the syntax. Here's what I have run
'use strict';
import {createClient} from 'redis';
// These are just values stored in environment variables.
const REDISHOST = process.env.REDIHOST;
const REDISPORT = process.env.REDIPORT;
const REDISAUTH = process.env.REDISAUTH;
const redisClient.createClient();
redisClient.host = REDISHOST;
redisClient.port = REDISPORT;
redisclient.auth = REDISAUTH;
redisClient.on('error', (err) => console.error(`##### REDIS ERR: ${err}.`));
await redisClient.connect();
I can tell that host, port, and auth is being set in redisClient, but when I connect, it tries to connect to localhost and fails. Any idea what I am missing here?
You need to pass the connection information in the call the createClient():
const redisClient = createClient({
socket: {
host: REDISHOST,
port: REDISPORT
},
password: REDISAUTH
})
There are lots of options for connecting. They are all detailed in the client configuration guide.
Here is my complete code for sql connection, all code I have got from stackoverflow issues.
Everywhere, I found the same code is being suggested, hence I also tried with the same.
I have some other application which uses same connection with NextJs and it works fine, however, If I try only with NodeJS code, it gives some socket hang up error (code:'ESOCKET' name:'ConnectionError').
Please make a note that TCP is already configured on remote server and its working fine with other applications.
Any help is appreciated, thank you.
const express = require('express');
const fs = require('fs');
const path = require('path');
const cheerio = require("cheerio");
const sql = require('mssql');
require('dotenv').config(); //to use the env variables
// config for your database
var config = {
user: process.env.DATABASE_USER,
password: process.env.DATABASE_PASSWORD,
server: process.env.DATABASE_HOST,
database: process.env.SOMEDB,
port: 14345, // process.env.DATABASE_PORT,
options: {
encrypt: true, // for azure
trustServerCertificate: false // change to true for local dev / self-signed certs
}
};
// make sure that any items are correctly URL encoded in the connection string
let appPool = new sql.ConnectionPool(config);
//I got error on below connect
sql.connect(config).then(function(pool) {
//It never reaches here, it directly goes to the catch block
app.locals.db = pool;
const server = app.listen(3000, function () {
const host = server.address().address
const port = server.address().port
console.log('Example app listening at http://%s:%s', host, port)
})
}).catch(function(err) {
console.error('Error creating connection pool', err)
});
I have the same issue.
Try to use mssql version 6.0.1, it works on my code, but for sure we need to figure out the problem, since we can't think to mantain forever an old version of a package.
I kept trying to find the solution with different different configuration changes.
Finally, I have made a proper config, which worked and now its connecting properly as well as returning the data from the table.
require('dotenv').config(); //to access the process.env params
const sql = require("mssql"); //mssql object
var dbConfig = {
user: "ajay",
password: "abcd123",
server: "your_remote_sql_server_path",
port: 1433,
database: "your_database_name",
options: {
database: 'your_database_name',
trustServerCertificate: true
}
};
try {
//connection config will be used here to connect to the local/remote db
sql.connect(dbConfig)
.then(async function () {
// Function to retrieve the data from table
const result = await sql.query`select top 1 * from table_name`
console.dir(result)
}).catch(function (error) {
console.dir(error);
});
} catch (error) {
console.dir(error);
}
I am not sure what was the exact issue, but as per the previous config and this one, it seems like adding database name to the options has solved the issue.
Please make sure to save all the sensitive data to the .env file. (which you can access as PROCESS.env.parametername)
For me in driver mssql#9.1.1 making encrypt=false worked
const config = {
user: process.env.DATABASE_USER,
password: process.env.DATABASE_PASSWORD,
server: process.env.DATABASE_HOST,
database: process.env.SOMEDB,
port: 14345, // process.env.DATABASE_PORT,
options: {
encrypt: false
}
};
I have access to a remote postgres DB from pgAdmin4 and I also could access from nodejs using a Mac. Right now I'm using the same code to access the DB in Windows. The code for my connection is the following:
const { Client } = require('pg'); //Importing the Postgres package
const hosts= require('../hosts'); //Using the file containig all hosts
const connectionData = { //Begin creating the connection settings object
host: hosts.DBHost, //DB host
port: hosts.DBPort, //DB hosts port
database: hosts.DB, //DB
user: hosts.DBUser, //DB user
password: hosts.DBPassword, //DB user password
}
My test is the following:
var client = new Client(connectionData); //New client instance using the above connection settings
client.connect(); //Open the connection to the database()
sql = "select * from myTable";
client.query(sql)
.then(response => {
console.log ({"data": response}); //This isn't shown
})
.catch(err => {
console.log({"error": err}); //This isn't shown neither
})
No error, no exception, the DB server doesn't respond!
Why isn't the server responding?
I suspect that you have the same problem like in this other post. Since it is not a 100% duplicate I will post this again:
There is a known issue in the pg module and NodeJS 14.
The proposed solution is to make sure you have pg>=8.0.3 installed.
This can be done by updating pg in the dependencies.
Also make sure, that any other library depending on the pg module, is also up to date and has the latest pg version.
If this is not possible for any reason - using Node 12 should also work.
I want to display and edit data from a existing PostgreSQL database in an Angular Web Application.
I am completely new to angular and stuff.
I downloaded pg and express already.
After a look on this page: https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/mongoose
I figured I will need jugglingdb to connect the database to angular: https://npm.taobao.org/package/jugglingdb or https://www.npmjs.com/package/connect-jugglingdb
-> more specific: Juggling-db with postgres: https://npm.taobao.org/package/jugglingdb-postgres
So I created a new file called postgres.js:
var Schema = require('jugglingdb').Schema;
var schema = new Schema('postgres', {
database: 'mydatabase',
username: 'myusername',
host: 'myhostname', //I don't use the local user
port: XXXX,
password: s.password,
ssl: false
});
var Model = schema.define('Model', {
realNumber: {type: Number, dataType: 'float'}
});
Then I tried it with the help of this answer: Restful Api express postgres database
so I created a File called "dbconnector.js
const express = require('express')
const bodyParser = require('body-parser')
const app = express()
const port = 1234
const db = require('./dbconnector')
// 'db' is exported from a file such as
// dbconnector.js.
app.get('/things', db.getThings)
//In dbconnector.js:
const Pool = require('pg').Pool
const pool = new Pool({
user: 'myuser',
host: 'myhost',
database: 'mydb',
password: 'mypassword',
port: 5432,
})
const getThings = (request, response) => {
pool.query('SELECT * FROM public.regulation',
(error, results) =>
{
if (error) {
throw error
}
response.status(200).json(results.rows)
})
}
module.exports = {
getThings
}
I have searched, read and tried a lot of tutorials.
But whatever I try - I just can't display the data from the database in the web applikation.
Any ideas how I shall proceed?
Do you know a complete guide (connecting the database and displaying the data?)
or do you have any links or tips?
Edit
Found this very useful Link to a download example: https://grokonez.com/frontend/angular/angular-6/angular-6-httpclient-postgresql-node-js-express-sequelize-crud-apis-post-get-put-delete
An Angular application typically runs in the browser, while your database lives on a server. In simple terms, you usually connect them up by building a backend to your application that exposes any required data to consumers via an API.
It looks like you are using NodeJS for your backend from the links that you posted, so you could look into creating a RESTful API using express.
I created db.js file into my node project
const environment = process.env.NODE_ENV || 'development';
const configuration = require('../knexfile')[environment]; var
database = require('knex')(configuration);
module.exports = database;
I call require('xxxxxx/db.js') where I need knex, to make sql query for Postgres database (through different files). It eats my postgres connections (reach 100 pq connections very soon). I checked it with this script code under Postgres database.
select
sum( numbackends )
from
pg_stat_database;
What is the best practice to use knex into nodejs ?
const Knex = require('knex');
const { host, user, password, database, port } = require('settings')
const knex = Knex({
client: 'pg',
connection: { host, user, password, database, port },
pool: { min: 0, max: 200 }
});
I suggest to use Knex.raw(sql, args) as much as possible. Just because Knex uses the connection pool and release. no need to worry about it.
Hope this will help you somehow.
const knex = require('knex')({
client: 'pg',
connection: {
host : '127.0.0.1',
port : 3306,
user : 'your_database_user',
password : 'your_database_password',
database : 'myapp_test'
}
});
Source - https://knexjs.org/guide/#configuration-options