Node.js MySQL INSERT() Function

INSERT() function is a built-in function in MySQL that is used to insert a string into another string at some position after deleting some characters from it.

Syntax:

INSERT(string_1, position, number_of_characters_to_delete, string_2)

Parameters: It takes four parameters as follows:

• string_1: It is the given main string passed as a parameter.
• position: The string_2 will insert at this position.
• number_of_characters_to_delete: It is the number of characters to be deleted from string_1 at a given position.
• string_2: It is the given new string for insertion.

Return Value: It returns a new string after deleting characters from string_1 then inserting string_2.

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

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 INSERT('GeeksforGeeks', 1, 8, 'All Are ') AS 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: Here, the first 8 characters are deleted from ‘GeeksforGeeks’ from position 1 – ‘Geeks’. Then string_2 is inserted – ‘All Are Geeks’

Example 2:

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");

    // Here is the query
    let query =
"SELECT INSERT(name, 1, 0, 'Publisher - ') AS 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: