Every method for making asynchronous requests returns an [IDBRequest](#idbrequest) object that communicates back to the requesting application through events. This design means that any number of requests can be active on any at a time.

In the following example, we open a asynchronously. Various event handlers are registered for responding to various situations.

request . [result](#dom-idbrequest-result)

When a request is completed, returns the result, or undefined if the request failed. Throws a “[InvalidStateError](https://heycam.github.io/webidl/#invalidstateerror)“ [DOMException](https://heycam.github.io/webidl/#idl-DOMException) if the request is still pending.

request . [error](#dom-idbrequest-error)

When a request is completed, returns the (a [DOMException](https://heycam.github.io/webidl/#idl-DOMException)), or null if the request succeeded. Throws a “[InvalidStateError](https://heycam.github.io/webidl/#invalidstateerror)“ [DOMException](https://heycam.github.io/webidl/#idl-DOMException) if the request is still pending.

Returns the [IDBObjectStore](#idbobjectstore), [IDBIndex](#idbindex), or [IDBCursor](#idbcursor) the request was made against, or null if it was an open request.

request .

Returns the [IDBTransaction](#idbtransaction) the request was made within. If this as an , then it returns an upgrade transaction while it is running, or null otherwise.

request . [readyState](#dom-idbrequest-readystate)

Returns ["pending"](#dom-idbrequestreadystate-pending) until a request is complete, then returns ["done"](#dom-idbrequestreadystate-done).

The result attribute’s getter must an “[InvalidStateError](https://heycam.github.io/webidl/#invalidstateerror)“ [DOMException](https://heycam.github.io/webidl/#idl-DOMException) if this‘s is false. Otherwise, the attribute’s getter must return this‘s , or undefined if the request resulted in an error.

The error attribute’s getter must throw an “[InvalidStateError](https://heycam.github.io/webidl/#invalidstateerror)“ [DOMException](https://heycam.github.io/webidl/#idl-DOMException) if ‘s done flag is false. Otherwise, the attribute’s getter must return ‘s error, or null if no error occurred.

The transaction attribute’s getter must return ‘s transaction. This property can be null for certain requests, such as for returned from [open()](#dom-idbfactory-open).

The attribute’s getter must return ["pending"](#dom-idbrequestreadystate-pending) if this‘s is false, and ["done"](#dom-idbrequestreadystate-done) otherwise.

The onsuccess attribute is the event handler for the success event.

The onerror attribute is the event handler for the event.

Methods on [IDBDatabase](#idbdatabase) that return a open request use an extended interface to allow listening to the and upgradeneeded events.

The onblocked attribute is the event handler for the event.

The onupgradeneeded attribute is the event handler for the upgradeneeded event.