Node.js MySQL LENGTH() Function

LENGTH() Function is a Builtin function in MySQL which is used to get length of given string in bytes.

Syntax:

LENGTH(input_string)

Parameters: LENGTH() function accepts a single parameter as mentioned above and described below.

• input_string: We will get number of characters of this string

Return Value: LENGTH() function returns length of given string in bytes.

Modules:

• mysql: To handle MySQL Connection and Queries

npm install mysql

SQL publishers Table Preview:

Example 1:

Javascript

const mysql = require("mysql");

let db_con = mysql.createConnection({
  host: "localhost",
  user: "root",
  password: "",
  database: "gfg_db",
});

db_con.connect((err) => {
  if (err) {
    console.log("Database Connection Failed !!!", err);
    return;
  }

  console.log("We are connected to gfg_db database");

  // here is the query
  let query = `SELECT LENGTH('Geeks for Geeks') AS length_in_bytes`;

  db_con.query(query, (err, rows) => {
    if (err) throw err;

    console.log(rows);
  });
});

Output:

Example 2:

Javascript

const mysql = require("mysql");

let db_con = mysql.createConnection({
  host: "localhost",
  user: "root",
  password: "",
  database: "gfg_db",
});

db_con.connect((err) => {
  if (err) {
    console.log("Database Connection Failed !!!", err);
    return;
  }

  console.log("We are connected to gfg_db database");

  // here is the query
  let query = `SELECT name, LENGTH(name) AS length_in_bytes FROM publishers`;

  db_con.query(query, (err, rows) => {
    if (err) throw err;

    console.log(rows);
  });
});

Output: