MySQL - Select Query

To fetch data from a MySQL table through a Node.js program, we need to execute the SELECT statement using the query() function of the mysql2 library as −

sql="SELECT field1, field2,...fieldN FROM table_name";
con.query(sql);

To fetch data from a MySQL table through a Java program, we need to execute the SELECT statement using the JDBC function executeUpdate() as −

String sql="SELECT COLUMN_NAME1, COLUMN_NAME2,... FROM TABLE_NAME";
statement.executeQuery(sql);

To fetch data from a MySQL table through a Python program, we need to execute the SELECT statement using the execute() function of the MySQL Connector/Python as −

select_query = "SELECT COLUMN1, COLUMN2,.. FROM TABLE_NAME";
cursorObj.execute(select_query);

var mysql = require('mysql2');
var con = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "Nr5a0204@123"
});

  //Connecting to MySQL
  con.connect(function (err) {
  if (err) throw err;
  console.log("Connected!");

  //Creating a Database
  sql = "CREATE DATABASE IF NOT EXISTS TUTORIALS"
  con.query(sql);

  //Selecting a Database
  sql = "USE TUTORIALS"
  con.query(sql);

  //Creating a Table
  sql = "CREATE TABLE IF NOT EXISTS tutorials_tbl(tutorial_id INT NOT NULL PRIMARY KEY, tutorial_title VARCHAR(100) NOT NULL, tutorial_author VARCHAR(40) NOT NULL, submission_date DATE)"
  con.query(sql);
  //Inserting records into table
  sql = "INSERT INTO tutorials_tbl(tutorial_id, tutorial_title, tutorial_author, submission_date) VALUES(1, 'Learn PHP', 'John Paul', NOW()), (2, 'Learn MySQL', 'Abdul S', NOW()), (3, 'JAVA Tutorial', 'Sanjay', '2007-05-06'), (4, 'Python Tutorial', 'Sasha Lee', '2016-09-04'), (5, 'Hadoop Tutorial', 'Chris Welsh', NOW())"
  con.query(sql);

  //Selecting all the records from table
  sql = "SELECT * FROM tutorials_tbl"
  con.query(sql, function (err, result) {
      if (err) throw err;
      console.log(result);
  });
});

Output

The output produced is as follows −

Connected!
[
  {
    tutorial_id: 1,
    tutorial_title: 'Learn PHP',
    tutorial_author: 'John Paul',
    submission_date: 2023-07-25T18:30:00.000Z
  },
  {
    tutorial_id: 2,
    tutorial_title: 'Learn MySQL',
    tutorial_author: 'Abdul S',
    submission_date: 2023-07-25T18:30:00.000Z
  },
  {
    tutorial_id: 3,
    tutorial_title: 'JAVA Tutorial',
    tutorial_author: 'Sanjay',
    submission_date: 2007-05-05T18:30:00.000Z
  },
  {
    tutorial_id: 4,
    tutorial_title: 'Python Tutorial',
    tutorial_author: 'Sasha Lee',
    submission_date: 2016-09-03T18:30:00.000Z
  },
  {
    tutorial_id: 5,
    tutorial_title: 'Hadoop Tutorial',
    tutorial_author: 'Chris Welsh',
    submission_date: 2023-07-25T18:30:00.000Z
  }
]

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class SelectQuery {
	public static void main(String[] args) {
		String url = "jdbc:mysql://localhost:3306/TUTORIALS";
		String user = "root";
		String password = "password";
		ResultSet rs;
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
            Connection con = DriverManager.getConnection(url, user, password);
            Statement st = con.createStatement();
            //System.out.println("Database connected successfully...!");
            String sql = "SELECT * FROM tutorials_tbl";
            rs = st.executeQuery(sql);
            System.out.println("Select query executed successfully..!");
            System.out.println("Table records: ");
            while(rs.next()) {
            	String tutorial_id = rs.getString("tutorial_id");
            	String tutorial_title = rs.getString("tutorial_title");
            	String tutorial_author = rs.getString("tutorial_author");
            	String submission_date = rs.getString("submission_date");
            	System.out.println("Id: " + tutorial_id + ", Title: " + tutorial_title + ", Author: " +  tutorial_author + ", Submission_date: " + submission_date);
            }
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
}

Output

The output obtained is as shown below −

Select query executed successfully..!
Table records: 
Id: 1, Title: Learn PHP, Author: John Paul, Submission_date: 2023-08-08

import mysql.connector
import datetime
#establishing the connection
connection = mysql.connector.connect(
    host='localhost',
    user='root',
    password='password',
    database='tut'
)
table_name = 'tutorials_tbl'
#Creating a cursor object 
cursorObj = connection.cursor()
select_query = f"SELECT tutorial_id, tutorial_title, tutorial_author, submission_date FROM {table_name}"
cursorObj.execute(select_query)
result = cursorObj.fetchall()
print("Tutorial Table Data:")
for row in result:
    print(row)
cursorObj.close()
connection.close()

Output

Following is the output of the above code −

Derived Table Result:
Tutorial Table Data:
(1, 'Learn PHP', 'John Paul', datetime.date(2023, 3, 28))
(2, 'Learn MySQL', 'Abdul S', datetime.date(2023, 3, 28))
(3, 'JAVA Tutorial', 'Sanjay', datetime.date(2007, 5, 6))
(4, 'Python Tutorial', 'Sasha Lee', datetime.date(2016, 9, 4))
(5, 'Hadoop Tutorial', 'Chris Welsh', datetime.date(2023, 3, 28))
(6, 'R Tutorial', 'Vaishnav', datetime.date(2011, 11, 4))