Node.js MySQL LENGTH() Function

Last Updated : 07 Oct, 2021

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); 
  }); 
}); 