How do I create a mysql database for my nodejs project? - mysql

Question

This should be really basic and simple to do but I can seriously not find any understandable information on how to create a simple database for my nodejs typescript project.
I have installed the following packages with npm:
mysql2
sequelize
sequelize-cli
sequelize-typescript
I have attempted the following commands at the terminal
C:\repos\NodeNew>mysql2 -u root -p
'mysql2' is not recognized as an internal or external command,
operable program or batch file.
C:\repos\NodeNew>mysql -u root -p
'mysql' is not recognized as an internal or external command,
operable program or batch file.
C:\repos\NodeNew>node mysql2 -u root -p
module.js:538
throw err;
^
Error: Cannot find module 'C:\repos\NodeNew\mysql2'
at Function.Module._resolveFilename (module.js:536:15)
at Function.Module._load (module.js:466:25)
at Function.Module.runMain (module.js:676:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
C:\repos\NodeNew>
So how do I CREATE my database so I can connect to it with sequelize etc?

Answer 1

The tools you have installed are only for connecting a Node.js app to MySQL and do not include command-line tools to manage the MySQL server.
I will assume you have installed MySQL and it's running – you should then be able to find its mysql.exe command line client in the bin/ directory in the server's installation directory. If you haven't fiddled with authentication, just running it might work.
When you get to a MySQL prompt, you can follow any old instructions for creating a database; CREATE DATABASE foo; is the gist of it (authentication and permissions being a different story).
Since you're on Windows, you might want to look into HeidiSQL – it's been a while since I've used it, but it's a decent graphical MySQL management tool.
You can also use mysql2 to create the database – illustrated below – but I recommend getting a management tool.
const mysql = require('mysql2');
const connection = mysql.createConnection({
host: 'localhost',
user: 'root',
database: 'mysql',
});
connection.query('CREATE DATABASE foo');

Answer 2

You should have MySQL installed on your computer, to install mysql on Windows see the following page: MySql
Once you have MySQL up and running on your computer. Open the Command Terminal and execute the following:
npm install mysql
Now you have downloaded and installed a mysql database driver. Node.js can use this module to manipulate the MySQL database:
var mysql = require('mysql');
To create a conecction create a file connection.js:
var con = mysql.createConnection({
host: "localhost",
user: "yourusername",
password: "yourpassword"
});
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
});
to test it save the file and run:
node connection.js
Which will give you this result:
Connected!

Answer 3

It can be solved using beforeConnect hook of sequelize as below:
const env = process.env.NODE_ENV || 'development';
const config = require(__dirname + '/../config/config.json')[env];
const { host, port, username, password } = config;
# create sequelize instance without providing db name in config
sequelize = new Sequelize('', username, password, config);
sequelize.beforeConnect(async (config) => {
const connection = await mysql.createConnection({ host: host, port: port, user: username, password: password });
await connection.query(`CREATE DATABASE IF NOT EXISTS \`${process.env.DB_NAME}\`;`);
config.database = process.env.DB_NAME;
});
Config.json file contains configurations for different dbs like
{
"development": {
"username": "root",
"password": "init#123",
"host": "mysqldb",
"dialect": "mysql"
},
"test": {
"username": "root",
"password": null,
"host": "127.0.0.1",
"dialect": "mysql"
},
"production": {
"username": "root",
"password": null,
"host": "127.0.0.1",
"dialect": "mysql",
}
}
Database name is provided after db connection and creation(if required) in sequelize beforeConnect hook