I write the code below. According to my understanding the "max:" in pool shows the max number of connection we can create in pool. So if I set the value of max as 0. Then it should not established any connection. I just want to clarify this.
var sequelize = new Sequelize(
process.env.DATABASE_NAME,
process.env.DATABASE_USERNAME,
process.env.DATABASE_PASSWORD, {
pool:{
max: 0,
min: 0,
idle: 10000,
acquire:30000
},
logging: console.log("connection created"),
host: process.env.DATABASE_HOST,
dialect: 'mysql',
operatorsAliases: false
}
);
I have no idea about Sequelize but simply we can create a connection this way.I think this will be little bit helpful for you.
/**
* create connection pool
*/
var con = mysql.createPool({
connectionLimit: 100000,
host: 'enter host',
user: process.env.DATABASE_USERNAME,
password: process.env.DATABASE_PASSWORD,
database: process.env.DATABASE_NAME
});
con.getConnection(async function(err, connection) {
let result=connection.query('SELECT * FROM table_name');
console.log(result);
if(err) throw err;
})
what's wrong with the way they have it set up in their examples exactly?
const sequelize = new Sequelize(config.db.uri, {
pool: {
max: 100,
min: 0,
idle: 10000,
},
dialectOptions: {
ssl: config.db.ssl,
},
// logging: logger.debug.bind(logger),
});
the models utilize it on their own... what am i missing here?
For "sequelize": "^5.21.3", you can't set pool.max to 0 anymore. If you do this, sequelize will throw an error:
max must be an integer > 0
Related
I want Sequelize to use my local time for reading and writing to database.
in Sequelize config file I added timezone: "+04:30", but it is just for writing in database.
for writing in database when i add
dialectOptions: {
useUTC: false, // -->Add this line. for reading from database
},
i get this error :
Ignoring invalid configuration option passed to Connection: useUTC. This is currently a warning, but in future versions of MySQL2, an error will be thrown if you pass an invalid configuration option to a Connection
full config file :
const Sequelize = require("sequelize");
const sequelize = new Sequelize("db", "root", "", {
dialect: "mysql",
port: process.env.SQL_PORT,
host: "localhost",
charset: "utf8",
collate: "utf8_persian_ci",
logging: false,
dialectOptions: {
useUTC: false, // -->Add this line. for reading from database
},
timezone: "+04:30",
});
Finally I fixed it by getter in my model:
createdAt: {
type: Sequelize.DATE,
defaultValue: moment(new Date()).format("YYYY-MM-DD HH:mm:ss"),
get: function () {
var isoDateString = new Date(this.getDataValue("createdAt"));
return new Date(
isoDateString.getTime() -
isoDateString.getTimezoneOffset() * 60 * 1000
);
},
},
and change my config file to :
const Sequelize = require("sequelize");
const sequelize = new Sequelize("db", "root", "", {
dialect: "mysql",
port: process.env.SQL_PORT,
host: "localhost",
charset: "utf8",
collate: "utf8_persian_ci",
logging: false,
timezone: "+04:30",
});
I'm experiencing below error after upgrading to Node.js v16.4.0 (from Node.js v12).
I'm using knex to connect to db (postgres) and using ORM - objection.js.
KnexTimeoutError: Knex: Timeout acquiring a connection. The pool is probably full. Are you missing a .transacting(trx) call?
Please help to resolve!
import Knex from "knex";
const getConnection = () => {
try {
return Knex({
client: 'pg',
connection: {
user: 'user',
password: 'password',
host: 'dbhost',
port: 5432,
database: 'dbname',
},
pool: {
min: 0,
max: 10,
idleTimeoutMillis: 10000,
acquireTimeoutMillis: 30000,
},
acquireConnectionTimeout: 2000,
});
}
catch (err) {
throw err;
}
}
const getTransaction = () => {
const con = getConnection();
const trx = con.transaction();
return trx;
}
Having had the same issue, I traced the problem to an old version of the "pg" package.
Doing
npm i pg#latest
fixed it
I'm trying to assign a different value to sequelize based on whether the app is running locally or on the server. This is my code:
const sequelize = production
? sequelizeHeroku.connect(Sequelize)
: new Sequelize(database, user, password, {
host,
dialect: "mysql",
pool: {
max: 10,
min: 0,
acquire: 30000,
idle: 10000
}
});
This doesn't work locally, as when I log the value of sequelize it is false. However, if I try to assign the variable like this:
const sequelize = new Sequelize(database, user, password, {
host,
dialect: "mysql",
pool: {
max: 10,
min: 0,
acquire: 30000,
idle: 10000
}
});
it works just fine. I also checked that console.log(production == true) prints out false. What am I doing wrong?
It's better to use NODE_ENV environment variable. E.g.
index.ts:
import { Sequelize } from 'sequelize';
import assert from 'assert';
const database = 'sample';
const user = 'testuser';
const password = 'testpass';
const host = '127.0.0.1';
const sequelize =
process.env.NODE_ENV === 'production'
? 'sequelize heroku'
: new Sequelize(database, user, password, {
host,
dialect: 'mysql',
pool: {
max: 10,
min: 0,
acquire: 30000,
idle: 10000,
},
});
assert(process.env.NODE_ENV === 'production', 'NODE_ENV should be "production"');
assert(sequelize === 'sequelize heroku', 'Should use heroku sequelize in production environment');
Execute code in production environment:
NODE_ENV=production npx ts-node ./index.ts
No assertion failed. It works as expected.
I am using nodejs-v9.2.0 and mysql in my application.
Error:
code: 'ER_CON_COUNT_ERROR'
errno: 1040
NPM Modules:
Mysql
Mysql wrapper
Code:
var mysql = require('mysql');
var pool = mysql.createPool({
canRetry: true,
database: "dbname",
host: "host",
user: "user",
password: "password",
connectionLimit: 100,
supportBigNumbers: true,
bigNumberStrings: true,
charset: 'utf8mb4_unicode_ci',
multipleStatements: true,
debug: true
waitForConnections: true,
queueLimit: 0
});
pool.on('connection', (connection) => {
connection.on('error', (err) => {
connection.release();
});
connection.on('close', (err) => {
console.error(new Date(), 'MySQL close', err);
});
});
var createMySQLWrap = require('mysql-wrap');
var sql = createMySQLWrap(pool);
Note:
I have noticed an open issue in the mysql npm github.
Any work around to solve this issue?
Any suggestion will be grateful
I am trying to turn the following database connection string into a module:
require('dotenv').load();
var knex = require('knex')({
client: 'pg',
connection: {
host: 'localhost',
user: process.env.DB_USER,
password: process.env.DB_USER_PASSWORD,
database: process.env.DB_NAME
},
pool: {
min: 0,
max: 7
}
});
So far I tried:
require('dotenv').load();
module.exports = {
knex : require('knex')({
client: 'pg',
connection: {
host: 'localhost',
user: process.env.DB_USER,
password: process.env.DB_USER_PASSWORD,
database: process.env.DB_NAME
},
pool: {
min: 0,
max: 7
}
})
}
In my app.js file:
var knex = require('./models/database');
knex.select().table('users').then(function(result) {
result.forEach(function(value) {
console.log(value.first_name);
});
});
This returns the error 'knex' is undefined. I think the way my module is being exported is incorrect... can someone help?
Thank you!
It's because you're exporting an object containing knex.
Either add knex to the require:
var knex = require('./models/database').knex;
or change your export to
module.exports = require('knex')({ ... })