I'm facing this warning/error message that pops up every minute or so after running my Node project for 2-3mins. Been searching online but couldn't find any solution for this.
pool failed to create connection ((conn=-1, no: 45009, SQLState: 08S01) socket has unexpectedly been closed)
My db.js
const mysql = require("mysql"); //^2.18.1
const mariadb = require("mariadb"); //^2.5.3
const DB_OPTIONS = {
host: "127.0.0.1",
user: "root",
password: "",
database: "test-db",
port: 3306,
minDelayValidation: 5000
};
const connection = mariadb.createPool(DB_OPTIONS);
connection.getConnection().then((conn) => {
console.log("Connected to DB!", conn.threadId);
if (conn) conn.release();
}).catch((err) => {
console.error("Error while connecting to DB", err);
});
module.exports = connection;
test.js
...
let database = require("./../middleware/db");
...
...
try
{
database.query(dbQuery, dbParameters).then((result) => {
...
}).catch((dbCatchErr) => {
...
})
}
catch (catchErr)
{
console.error(catchErr);
}
MariaDB Version: 10.3.23
Related
I get an error when running the integration tests:
0 passing (17s)
1 failure
1) Registration page
register new users allowed and update status in the database:
TypeError: Net.connect is not a function
at new Connection (webpack:///./node_modules/mysql2/lib/connection.js:50:0)
at ./node_modules/mysql2/index.js.exports.createConnection (webpack:///./node_modules/mysql2/index.js:10:0)
at Context.eval (webpack:///./cypress/integration/registration.spec.js:23:34)
Here is my environment:
MySQL Workbench
MySQL Server 8.0.29
I raised local backendless, I have access to the database. Here is my code:
const mysql2 = require('mysql2');
describe('Registration page', () => {
beforeEach(() => {
// visit the registration page
cy.visit('http://localhost:3000/registration');
});
it('register new users allowed and update status in the database', () => {
// fill out the registration form
cy.get('input[name="fullName"]').type("Nazar Dmytryshyn")
cy.get('input[type="email"]').type('testuser#example.com');
cy.get('input[name="pwd"]').type('testpassword');
cy.get('input[name="confirmPassword"]').type('testpassword');
// submit the form
cy.get('button[class="btn btn-success"]').click();
// check that the user is redirected to the login page
cy.url().should('include', '/login');
// create a connection to the test database
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
});
// open the connection
connection.connect();
// update the developer status in the database
connection.query(
'UPDATE `main_backendless`.`Developer` SET `developerStatusId` = "1" WHERE (`email` = "testuser#example.com")',
(error, results) => {
if (error) throw error;
expect(results.affectedRows).to.equal(1);
}
);
// close the connection
connection.end();
});
});
I checked this data 10 times, it is correct and I can connect to the database through MySQL WorkBench
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'main_backendless'
I will be grateful for any ideas that can be achieved!
I recommend using the cypress-mysql, which hides a lot of the implementation details for you.
If you try to roll your own task, you may end up with an undefined return value.
Install
npm install cypress-mysql
//or
yarn add cypress-mysql
Configure
The release notes are out of date, here is the configuration for Cypress 10+
// cypress.config.js
const { defineConfig } = require("cypress");
const mysql = require('cypress-mysql');
module.exports = defineConfig({
// ...
e2e: {
setupNodeEvents(on, config) {
mysql.configurePlugin(on);
},
"env": {
"db": {
"host": "localhost",
"user": "user",
"password": "password",
"database": "database"
}
}
})
// cypress/support/e2e.js
const mysql = require('cypress-mysql');
mysql.addCommands();
Test
const sql = 'UPDATE "main_backendless.Developer" SET "developerStatusId" = "1" WHERE ("email" = "testuser#example.com")'
cy.query(sql).then(res => {
expect(res.affectedRows).to.equal(1)
});
If you want to use a task to call the mySql library, you must return a Promise from the task.
This is because the mysql calls are asynchronous, and the only way Cypress knows to wait for them is to get a promise returned from your code.
cypress.config.js
const { defineConfig } = require("cypress")
const mysql2 = require('mysql2')
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
})
module.exports = defineConfig({
e2e: {
setupNodeEvents(on, config) {
on('task', {
mySql: (sql) => {
return new Promise((resolve, reject) => {
connection.query(sql, (error, results) => {
if (error) {
reject(error)
} else {
resolve(results.affectedRows)
})
})
})
}
})
},
})
it('tests with mysql', () => {
cy.task('mySql', 'sql staement here')
.then(result => {
expect(result).to.equal(1);
})
})
With Promise-wrapper
Alternatively, mysql2 provides a promise-wrapper that can simplify your code:
const { defineConfig } = require("cypress")
const mysql = require('mysql2/promise') // different import here
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
})
module.exports = defineConfig({
e2e: {
setupNodeEvents(on, config) {
on('task', {
mySql: async (sql) => { // async here
const result = await connection.execute(sql) // await here
return result;
}
})
},
})
The issue is that you're using a nodejs library with Cypress. Cypress tests execute inside a browser and cannot directly utilize nodejs libraries within a test.
To do what you want to need to create a cy.task() to be able to execute code in nodejs.
Assuming you're using js, create a file with a function to use the sql connector
// runSql.js
const mysql2 = require('mysql2');
function runSql(sql) {
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
});
connection.connect();
let rows;
connection.query(sql, (error, results) => {
if (error) throw error;
rows = results.affectedRows
});
connection.end();
return rows;
}
module.exports = runSql;
Then in the cypress.config.js file
const runSql = require('./runSql.js');
module.exports = defineConfig({
// ...
e2e: {
setupNodeEvents(on, config) {
on('task', {
runSql
});
},
});
Now to call the task in a test
describe('Registration page', () => {
it('test', () => {
const sql = 'UPDATE `main_backendless`.`Developer` SET `developerStatusId` = "1" WHERE (`email` = "testuser#example.com")';
cy.task('runSql', sql).then((rows) => {
expect(rows).to.equal(1);
});
});
});
I get an error when running the integration tests:
0 passing (17s)
1 failure
1) Registration page
register new users allowed and update status in the database:
TypeError: Net.connect is not a function
at new Connection (webpack:///./node_modules/mysql2/lib/connection.js:50:0)
at ./node_modules/mysql2/index.js.exports.createConnection (webpack:///./node_modules/mysql2/index.js:10:0)
at Context.eval (webpack:///./cypress/integration/registration.spec.js:23:34)
Here is my environment:
MySQL Workbench
MySQL Server 8.0.29
I raised local backendless, I have access to the database. Here is my code:
const mysql2 = require('mysql2');
describe('Registration page', () => {
beforeEach(() => {
// visit the registration page
cy.visit('http://localhost:3000/registration');
});
it('register new users allowed and update status in the database', () => {
// fill out the registration form
cy.get('input[name="fullName"]').type("Nazar Dmytryshyn")
cy.get('input[type="email"]').type('testuser#example.com');
cy.get('input[name="pwd"]').type('testpassword');
cy.get('input[name="confirmPassword"]').type('testpassword');
// submit the form
cy.get('button[class="btn btn-success"]').click();
// check that the user is redirected to the login page
cy.url().should('include', '/login');
// create a connection to the test database
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
});
// open the connection
connection.connect();
// update the developer status in the database
connection.query(
'UPDATE `main_backendless`.`Developer` SET `developerStatusId` = "1" WHERE (`email` = "testuser#example.com")',
(error, results) => {
if (error) throw error;
expect(results.affectedRows).to.equal(1);
}
);
// close the connection
connection.end();
});
});
I checked this data 10 times, it is correct and I can connect to the database through MySQL WorkBench
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'main_backendless'
I will be grateful for any ideas that can be achieved!
I recommend using the cypress-mysql, which hides a lot of the implementation details for you.
If you try to roll your own task, you may end up with an undefined return value.
Install
npm install cypress-mysql
//or
yarn add cypress-mysql
Configure
The release notes are out of date, here is the configuration for Cypress 10+
// cypress.config.js
const { defineConfig } = require("cypress");
const mysql = require('cypress-mysql');
module.exports = defineConfig({
// ...
e2e: {
setupNodeEvents(on, config) {
mysql.configurePlugin(on);
},
"env": {
"db": {
"host": "localhost",
"user": "user",
"password": "password",
"database": "database"
}
}
})
// cypress/support/e2e.js
const mysql = require('cypress-mysql');
mysql.addCommands();
Test
const sql = 'UPDATE "main_backendless.Developer" SET "developerStatusId" = "1" WHERE ("email" = "testuser#example.com")'
cy.query(sql).then(res => {
expect(res.affectedRows).to.equal(1)
});
If you want to use a task to call the mySql library, you must return a Promise from the task.
This is because the mysql calls are asynchronous, and the only way Cypress knows to wait for them is to get a promise returned from your code.
cypress.config.js
const { defineConfig } = require("cypress")
const mysql2 = require('mysql2')
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
})
module.exports = defineConfig({
e2e: {
setupNodeEvents(on, config) {
on('task', {
mySql: (sql) => {
return new Promise((resolve, reject) => {
connection.query(sql, (error, results) => {
if (error) {
reject(error)
} else {
resolve(results.affectedRows)
})
})
})
}
})
},
})
it('tests with mysql', () => {
cy.task('mySql', 'sql staement here')
.then(result => {
expect(result).to.equal(1);
})
})
With Promise-wrapper
Alternatively, mysql2 provides a promise-wrapper that can simplify your code:
const { defineConfig } = require("cypress")
const mysql = require('mysql2/promise') // different import here
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
})
module.exports = defineConfig({
e2e: {
setupNodeEvents(on, config) {
on('task', {
mySql: async (sql) => { // async here
const result = await connection.execute(sql) // await here
return result;
}
})
},
})
The issue is that you're using a nodejs library with Cypress. Cypress tests execute inside a browser and cannot directly utilize nodejs libraries within a test.
To do what you want to need to create a cy.task() to be able to execute code in nodejs.
Assuming you're using js, create a file with a function to use the sql connector
// runSql.js
const mysql2 = require('mysql2');
function runSql(sql) {
const connection = mysql2.createConnection({
host: '127.0.0.1:3306',
user: 'root',
password: 'rootpassword',
database: 'local1'
});
connection.connect();
let rows;
connection.query(sql, (error, results) => {
if (error) throw error;
rows = results.affectedRows
});
connection.end();
return rows;
}
module.exports = runSql;
Then in the cypress.config.js file
const runSql = require('./runSql.js');
module.exports = defineConfig({
// ...
e2e: {
setupNodeEvents(on, config) {
on('task', {
runSql
});
},
});
Now to call the task in a test
describe('Registration page', () => {
it('test', () => {
const sql = 'UPDATE `main_backendless`.`Developer` SET `developerStatusId` = "1" WHERE (`email` = "testuser#example.com")';
cy.task('runSql', sql).then((rows) => {
expect(rows).to.equal(1);
});
});
});
const express = require('express')
const app = express()
// const mysql = require('mysql')
const mysql = require('./db')()
const cors = require('cors')
require('dotenv').config();
const port = process.env.PORT || 5000
app.use(express.json())
app.use(cors())
app.listen(port, () => console.log(`${port}`))
app.get('/', (req, res) => {
res.send("hi")
})
const connection = mysql.init()
mysql.open(connection)
This is my server.js code.
const mysql = require('mysql')
require('dotenv').config();
module.exports = function() {
return {
init: function () {
return mysql.createConnection({
host: process.env.HOST,
user: process.env.USER,
password: process.env.PASSWORD,
database: process.env.DATABASE,
port: process.env.PORT
})
},
open: function(con) {
con.connect(function(err) {
// if (err) throw err
// console.log('Connected!')
if(err) {
console.log('mysql connection error: '+err)
} else {
console.log('mysql is connected successfully.')
}
})
}
}
}
And this is my db.js code...
I expect the port number and message "mysql is connected successfully" to be printed when this code is executed. But when I run it, nothing is output except for the port number. Even an error message.
So I can't verify that the database connection was made properly. Why is the contents of the connect() function not executed?
You have used same environment variable for server port and database port. Please change variable name PORT of database port to DB_PORT in .env file. Then change the environment variable name in the database port of db.js file as well.
db.js
const mysql = require("mysql");
require("dotenv").config();
module.exports = function () {
return {
init: function () {
return mysql.createConnection({
host: process.env.HOST,
user: process.env.USER,
password: process.env.PASSWORD,
database: process.env.DATABASE,
port: process.env.DB_PORT,
});
},
open: function (con) {
con.connect(function (err) {
// if (err) throw err
// console.log('Connected!')
if (err) {
console.log("mysql connection error: " + err);
} else {
console.log("mysql is connected successfully.");
}
});
},
};
};
example .env file
PORT=8080
HOST=localhost
USER=root
PASSWORD=root
DATABASE=dbname
DB_PORT=3306
I am trying to do window authentication using msnodesqlv8 in Nestjs. So, how to do this connection using TypeOrm?
const mypool = new mssql.ConnectionPool({
driver: 'msnodesqlv8',
server: 'W70100\\SQLEXPRESS01',
database: 'Test',
port: 1433,
options: {
trustedConnection: true,
useUTC: true
},
});
const conn = mypool.connect().then(pool => {
console.log('Connected to MSSQL (DB: mydb)', pool);
var request = new mssql.Request(mypool);
request.query('select * from [Test].[Emp]', (err, result) => {
if (err) console.log('Database Connection Failed! ON RESULT: ',err);
console.log(result)
})
// return pool;
}).catch(err => console.log('Database Connection Failed! Bad Config: ', err))
This works well, but how to connect this connection string using Typeorm?TypeOrmModule.forRoot({})
Please advice.
I am able to create a MySQL connection like this:
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'me',
password : 'secret',
database : 'my_db'
});
connection.connect();
But I would rather like to initiate a pool and use it across my project.
Just to help some one in future, this worked for me:
I created a mysql connector file containing the pool:
// Load module
var mysql = require('mysql');
// Initialize pool
var pool = mysql.createPool({
connectionLimit : 10,
host : '127.0.0.1',
user : 'root',
password : 'root',
database : 'db_name',
debug : false
});
module.exports = pool;
Later you can simply include the connector in another file lets call it manageDB.js:
var pool = require('./mysqlConnector');
And made a callable method like this:
exports.executeQuery=function(query,callback){
pool.getConnection(function(err,connection){
if (err) {
connection.release();
throw err;
}
connection.query(query,function(err,rows){
connection.release();
if(!err) {
callback(null, {rows: rows});
}
});
connection.on('error', function(err) {
throw err;
return;
});
});
}
You can create a connection file, Let's called dbcon.js
var mysql = require('mysql');
// connect to the db
dbConnectionInfo = {
host: "localhost",
port: "3306",
user: "root",
password: "root",
connectionLimit: 5, //mysql connection pool length
database: "db_name"
};
//For mysql single connection
/* var dbconnection = mysql.createConnection(
dbConnectionInfo
);
dbconnection.connect(function (err) {
if (!err) {
console.log("Database is connected ... nn");
} else {
console.log("Error connecting database ... nn");
}
});
*/
//create mysql connection pool
var dbconnection = mysql.createPool(
dbConnectionInfo
);
// Attempt to catch disconnects
dbconnection.on('connection', function (connection) {
console.log('DB Connection established');
connection.on('error', function (err) {
console.error(new Date(), 'MySQL error', err.code);
});
connection.on('close', function (err) {
console.error(new Date(), 'MySQL close', err);
});
});
module.exports = dbconnection;
Now include this connection to another file
var dbconnection = require('../dbcon');
dbconnection.query(query, params, function (error, results, fields) {
//Do your stuff
});
There is some bugs in Utkarsh Kaushik solution:
if (err), the connection can not be released.
connection.release();
and when it has an err, next statement .query always execute although it gets an error and cause the app crashed.
when the result is null although query success, we need to check if the result is null in this case.
This solution worked well in my case:
exports.getPosts=function(callback){
pool.getConnection(function(err,connection){
if (err) {
callback(true);
return;
}
connection.query(query,function(err,results){
connection.release();
if(!err) {
callback(false, {rows: results});
}
// check null for results here
});
connection.on('error', function(err) {
callback(true);
return;
});
});
};
You do also can access the Mysql in a similar way by firstly importing the package by entering npm install mysql in the terminal and installing it & initialize it.
const {createPool} = require("mysql");
const pool = createPool({
host : 'localhost',
user : 'me',
password : 'secret',
database : 'my_db'
)};
module.exports = pool;