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      Node.js Syntax

      MySQL Tutorial

      This SQL tutorial is structured for beginners to guide them from the foundational concepts to advanced data manipulation and querying techniques in SQL. By the end of this tutorial, you will have developed a robust understanding of SQL, equipping you with the knowledge to efficiently manage and analyze data across various database systems. This guide sets the stage for your growth into a skilled data professional, ready to tackle complex data challenges and contribute to the field of data analysis and database management.

      Node.js Syntax

      Node.js is a JavaScript runtime environment that allows developers to run JavaScript code outside of a web browser, enabling server-side scripting.
      When we talk about a Node.js MySQL connector, we are referring to a specific library that facilitates communication between a Node.js application and a MySQL database. This connector enables developers to interact with a MySQL database by providing methods and functionalities that simplify tasks like querying, updating, and managing data within the database using JavaScript code. Essentially, it acts as a bridge, allowing Node.js applications to seamlessly connect with and manipulate data stored in a MySQL database.

      Installation "mysql" package

      To use MySQL with Node.js, you can use the "mysql" package, which is a popular MySQL driver for Node.js. Here are the steps to install Node.js and the MySQL package
      Step 1: Install Node.js
      Visit the official Node.js website (https://nodejs.org/) and download the latest version of Node.js for your operating system. Follow the installation instructions provided on the website.
      Step 2: Create a Node.js Project
      Create a new directory for your Node.js project and navigate to it using your terminal or command prompt.
      mkdir mynodeproject
      cd mynodeproject
      Step 3: Initialize a Node.js Project
      Run the following command to initialize a new Node.js project. This will create a 'package.json' file.
      npm init -y
      Step 4: Install the MySQL Package
      Install the "mysql" package using the following command:
      npm install mysql
      Step 5: Create a JavaScript File
      Create a JavaScript file (e.g., app.js) in your project directory.
      Step 6: Run the Node.js Script
      Run your Node.js script using the following command:
      node app.js
      Now, you have successfully installed the MySQL Node.js connector (mysql package) for your Node.js project.

      NodeJS Functions to Access MySQL

      In Node.js, the "mysql" package provides a set of functions to interact with MySQL databases. Here are some of the major functions you can use
      S.No
      Function & Description
      1
      createConnection(config)
      Creates a new MySQL connection.
      2
      connect(callback)
      Establishes a connection to the MySQL server.
      3
      query(sql, values, callback)
      Executes a SQL query on the connected MySQL database. You can provide placeholders in the SQL query and pass values as an array to replace the placeholders.
      4
      execute(sql, values, callback)
      Similar to the query function, but specifically designed for executing non-select queries (e.g., INSERT, UPDATE, DELETE).
      5
      beginTransaction(callback)
      Starts a new transaction.
      6
      commit(callback)
      Commits the current transaction.
      7
      rollback(callback)
      Rolls back the current transaction.
      8
      end()
      Closes the MySQL connection.

      Basic Example

      Following are the steps to connect and communicate with a MySQL database using Node.js
      • Download and install Node.js
      • Create a new directory, navigate to it, and run 'npm init -y'.
      • Run 'npm install mysql'.
      • Create a JavaScript file (e.g., app.js) and use the "mysql" package to connect to the MySQL database.
      • Use the query or execute functions to perform SQL queries on the database.
      • Implement error handling for database operations. Close the database connection when finished.
      • Execute your Node.js script with node app.js.
      The following example shows a generic syntax of NodeJS to call any MySQL query.
      const mysql = require("mysql2");
      
      // Create a connection to the MySQL database
      const connection = mysql.createConnection({
        host: 'your-mysql-hostname',
        user: 'your-mysql-username',
        password: 'your-mysql-password',
        database: 'your-mysql-database',
      });
      
      // Connect to the database
      connection.connect((err) => {
        if (err) {
          console.error('Error connecting to MySQL:', err);
          return;
        }
        console.log('Connected to MySQL database');
        
        // Perform MySQL operations here
        connection.query("SELECT * FROM your_table", (err, results) => {
          if (err) throw err;
          console.log('Query result:', results);
        });
      
        // Close the connection when done
        connection.end((err) => {
          if (err) console.error('Error closing MySQL connection:', err);
          else console.log('Connection closed');
        });
      });