Node.js MySQL FIELD() Function

FIELD() function is a built-in function in MySQL that is used to get the position of the first occurrence of a value in a set of expressions. In the case of string values, it is not case-sensitive.

Syntax:

FIELD(value, input_1, input_2, input_3, ...)

Parameters: It takes two parameters as follows:

• value: It is the given value to be searched.
• input: It is the inputs that are checked for equality against the given value.

Return Value: It returns the position of the first occurrence of a value in a set of expressions. If nothing found then it will return 0.

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 FIELD(2, 12, 15, 2, 122) 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:

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 FIELD('geek', 'Geeek', 'gEEK', 'geeK') 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: