Introduction:

We are going to see how to create and use mysql database in nodejs. We are going to do this with the help of CREATE DATABASE query.

Syntax:

Create Database Query: CREATE DATABASE gfg_db;

Use Database Query: USE gfg_db

Modules:

• NodeJs
• ExpressJs
• MySql

Setting up environment and Execution:

1. Create Project

   npm init

2. Install Modules

   npm install express
   npm install mysql

3. Create and export mysql connection object. sqlConnection.js

   const mysql = require("mysql");
   
   let db_con  = mysql.createConnection({
       host: "localhost",
       user: "root",
       password: ''
   });
   
   db_con.connect((err) => {
       if (err) {
         console.log("Database Connection Failed !!!", err);
       } else {
         console.log("connected to Database");
       }
   });
   
   module.exports = db_con;
   

4. Create Server: index.js

   const express = require("express");
   const database = require('./sqlConnection');
   
   const app = express();
   
   app.listen(5000, () => {
     console.log(`Server is up and running on 5000 ...`);
   });
   

5. Create Route to Create Database and use it. JavaScript

   app.get("/createDatabase", (req, res) => {
   
       let databaseName = "gfg_db";
   
       let createQuery = `CREATE DATABASE ${databaseName}`;
   
       // use the query to create a Database.
       database.query(createQuery, (err) => {
           if(err) throw err;
   
           console.log("Database Created Successfully !");
   
           let useQuery = `USE ${databaseName}`;
           database.query(useQuery, (error) => {
               if(error) throw error;
   
               console.log("Using Database");
               
               return res.send(
   `Created and Using ${databaseName} Database`);
           })
       });
   });
   

6. Output: Put this link in your browser http://localhost:5000/createDatabase

   Created and Using gfg_db Database