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home / developersection / interviews / how do you add, get, update, and delete records?
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Manish Sharma
Manish Sharma

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My name is Manish Sharma I am a manager in think way company I do one other work. My name is Manish Sharma I am a manager in think way company I do one other work.

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1 Answers

Manish Sharma
Manish Sharma 02 Jul 2025
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We'll assume a database UserDB with an object store named users and keyPath: "id".

Setup (once)

const request = indexedDB.open("UserDB", 1);

request.onupgradeneeded = function (event) {
    const db = event.target.result;
    if (!db.objectStoreNames.contains("users")) {
        db.createObjectStore("users", { keyPath: "id" });
    }
};

Add a Record

function addUser(db, user) {
    const tx = db.transaction("users", "readwrite");
    const store = tx.objectStore("users");
    store.add(user); // Must contain a unique "id"
}

Example usage:

addUser(db, { id: 1, name: "Alice", email: "alice@example.com" });

Get a Record by Key

function getUser(db, id) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction("users", "readonly");
        const store = tx.objectStore("users");
        const request = store.get(id);

        request.onsuccess = () => resolve(request.result);
        request.onerror = () => reject(request.error);
    });
}

Usage:

getUser(db, 1).then(user => console.log(user));

Update a Record

You use put() instead of add() — it replaces the object with the same key:

function updateUser(db, updatedUser) {
    const tx = db.transaction("users", "readwrite");
    const store = tx.objectStore("users");
    store.put(updatedUser); // Replaces if id exists
}

Example:

updateUser(db, { id: 1, name: "Alice Smith", email: "alice@example.com" });

💡 put() will add a new record if the key doesn't exist — unlike add() which throws an error if the key exists.

Delete a Record

function deleteUser(db, id) {
    const tx = db.transaction("users", "readwrite");
    const store = tx.objectStore("users");
    store.delete(id);
}

Example:

deleteUser(db, 1);

Optional: Get All Records

function getAllUsers(db) {
    return new Promise((resolve, reject) => {
        const tx = db.transaction("users", "readonly");
        const store = tx.objectStore("users");
        const request = store.getAll();

        request.onsuccess = () => resolve(request.result);
        request.onerror = () => reject(request.error);
    });
}

Summary of Methods

Operation Method
Add store.add(data)
Get store.get(key)
Update store.put(data)
Delete store.delete(key)
Get All store.getAll()
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