Node.js MySQL SUBSTRING() Function
Last Updated :
17 Feb, 2021
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SUBSTRING() function is a built-in function in MySQL that is used to get a substring of input string between given range inclusive.
Syntax:
SUBSTRING(input_string, from, length)
Parameters: It takes three parameters as follows:
- input_string: It is the given string for which the substring will be executed.
- from: The substring will be taken from this position.
- length: It is the length of the substring.
Return Value: It returns a substring of input string between a given starting position and length. If length is out of string then the extra part is ignored.
Module Installation: Install the mysql module using the following command:
npm install mysql
Database: Our SQL publishers table preview with sample data is shown below:
Example 1:
- index.js
index.js
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"); // Notice the ? in query let query = `SELECT SUBSTRING("GeeksforGeeks", 8, 20) AS SUBSTRING_Output`; db_con.query(query, (err, rows) => { if(err) throw err; console.log(rows); }); }); |
Run the index.js file using the following command:
node index.js
Output:
Example 2:
- index.js
index.js
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"); // Notice the ? in query let query = `SELECT SUBSTRING(name, 1, 4) AS SUBSTRING_Name FROM publishers`; db_con.query(query, (err, rows) => { if(err) throw err; console.log(rows); }); }); |
Run the index.js file using the following command:
node index.js
Output:
