Javascript MySQL Datetime

Javascript is a popular programming language used in web development. MySQL is one of the most popular open source relational database management systems. Datetime is a data type used to store date and time values in MySQL. In this article, we'll explore how to work with datetime values in MySQL using Javascript.

Connecting to MySQL from Javascript

To connect to MySQL from Javascript, we can use a library such as mysqljs. Here's an example of how to connect to a MySQL database from Javascript:

const mysql = require('mysql');
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'mydb'
});

connection.connect((err) => {
  if (err) throw err;
  console.log('Connected to MySQL database!');
});

In this example, we're creating a new connection to a MySQL database running on the local machine. We're using the root user with the password "password" and connecting to the "mydb" database.

Working with Datetime Values in MySQL

Once we've connected to our MySQL database, we can start working with datetime values. We can insert datetime values into a MySQL table using the INSERT INTO SQL statement:

const date = new Date();
const datetime = date.toISOString().slice(0, 19).replace('T', ' ');

const sql = `INSERT INTO mytable (created_at) VALUES ('${datetime}')`;

connection.query(sql, (err, result) => {
  if (err) throw err;
  console.log('Inserted datetime value into MySQL table!');
});

In this example, we're creating a new Date object and converting it to an ISO string. We're then formatting the string to remove the time zone information and replace the "T" separator with a space. Finally, we're using this formatted string in an SQL statement to insert a new row into a MySQL table.

We can also retrieve datetime values from a MySQL table using the SELECT SQL statement:

const sql = `SELECT * FROM mytable WHERE created_at >= '${datetime}'`;

connection.query(sql, (err, result) => {
  if (err) throw err;
  console.log(result);
});

In this example, we're using an SQL statement to select all rows from a MySQL table where the "created_at" column is greater than or equal to a certain datetime value. We're using the same formatted datetime value as in our previous example.

Conclusion

In this article, we've explored how to work with datetime values in MySQL using Javascript. We've seen how to connect to a MySQL database from Javascript using the mysqljs library, and how to insert and retrieve datetime values from a MySQL table using SQL statements. With this knowledge, you can start building powerful web applications that use datetime values to manage and display time-based data.