AutoIncrement of Multiple columns in indexeddb - auto-increment

Question

Does any one know - how we can specify autoincrement for two columns in indexeddb.
I know - we can specify autoincremnt for one column while creating table like this -
var objectStore = thisDb.createObjectStore("note", { keyPath: "id", autoIncrement:true });
but not able to find how we can do the same for multiple columns. Also as far as i know - we cant get the value of autoincrement. The value will be autoincremented & added when we will insert the data. So if i can get the autoincrement value somehow, that would the solution too.

Answer 1

You cannot create two auto-incremented properties in a store. That feature is only available for the property defined as the key path.
You can easily get the auto-incremented value. The value is provided as the result of the put or add request that inserted a new object.
For example:
function addThing(db, thing) {
return new Promise((resolve, reject) => {
let id = undefined;
const transaction = db.transaction('things', 'readwrite');
const store = transaction.objectStore('things');
// wait to resolve the promise until the transaction is completed
// so that we do not prematurely pretend the operation succeeded. resolve
// to the value of the new id
transaction.oncomplete = event => resolve(id);
transaction.onerror = event => reject(event.target.error);
// store.add also works here
const request = store.put(thing);
// listen for the add event and grab the value of the new id
// that indexedDB generated and store it in the id variable
request.onsuccess = event => id = event.target.result;
});
}
async function doSomething() {
const something = {bar: 'baz'};
const db = await open(...);
const id = await addThing(db, something);
db.close();
something.id = id;
console.log(something);
}