Our volunteers haven't translated this article into বাংলা (বাংলাদেশ) yet. Join us and help get the job done!
You can also read the article in English (US).

The IDBDatabase interface of the IndexedDB API provides a connection to a database; you can use an IDBDatabase object to open a transaction on your database then create, manipulate, and delete objects (data) in that database. The interface provides the only way to get and manage versions of the database.

Note: This feature is available in Web Workers.

Note: Everything you do in IndexedDB always happens in the context of a transaction, representing interactions with data in the database. All objects in IndexedDB — including object stores, indexes, and cursors — are tied to a particular transaction. Thus, you cannot execute commands, access data, or open anything outside of a transaction.

Properties

IDBDatabase.name Read only
A DOMString that contains the name of the connected database.
IDBDatabase.version Read only
A 64-bit integer that contains the version of the connected database. When a database is first created, this attribute is an empty string.
IDBDatabase.objectStoreNames Read only
A DOMStringList that contains a list of the names of the object stores currently in the connected database.

Event handlers

IDBDatabase.onabort
Fires when access of the database is aborted.
IDBDatabase.onclose
Fires when the close event occurs; this happens when the database is unexpectedly closed, such as during application shutdown.
IDBDatabase.onerror
Fires when access to the database fails.
IDBDatabase.onversionchange

Fires when a database structure change (IDBOpenDBRequest.onupgradeneeded event or IDBFactory.deleteDatabase() was requested elsewhere (most probably in another window/tab on the same computer). This is different from the version change transaction (see IDBVersionChangeEvent), but it is related.

Methods

Inherits from: EventTarget

IDBDatabase.close()
Returns immediately and closes the connection to a database in a separate thread.
IDBDatabase.createObjectStore()
Creates and returns a new object store or index.
IDBDatabase.deleteObjectStore()
Destroys the object store with the given name in the connected database, along with any indexes that reference it.
IDBDatabase.transaction()
Immediately returns a transaction object (IDBTransaction) containing the IDBTransaction.objectStore method, which you can use to access your object store. Runs in a separate thread.

Example

In the following code snippet, we open a database asynchronously (IDBFactory), handle success and error cases, and create a new object store in the case that an upgrade is needed (IDBdatabase). For a complete working example, see our To-do Notifications app (view example live.)

// Let us open our database
  var DBOpenRequest = window.indexedDB.open("toDoList", 4);

  // these two event handlers act on the IDBDatabase object,
  // when the database is opened successfully, or not
  DBOpenRequest.onerror = function(event) {
    note.innerHTML += '<li>Error loading database.</li>';
  };
 
  DBOpenRequest.onsuccess = function(event) {
    note.innerHTML += '<li>Database initialised.</li>';
    
    // store the result of opening the database in the db
    // variable. This is used a lot later on
    db = DBOpenRequest.result;
    
    // Run the displayData() function to populate the task
    // list with all the to-do list data already in the IDB
    displayData();
  };
 
  // This event handles the event whereby a new version of
  // the database needs to be created Either one has not
  // been created before, or a new version number has been
  // submitted via the window.indexedDB.open line above
 
  DBOpenRequest.onupgradeneeded = function(event) {
    var db = event.target.result;
    
    db.onerror = function(event) {
      note.innerHTML += '<li>Error loading database.</li>';
    };

    // Create an objectStore for this database using
    // IDBDatabase.createObjectStore
    
    var objectStore = db.createObjectStore("toDoList", { keyPath: "taskTitle" });
    
    // define what data items the objectStore will contain
    
    objectStore.createIndex("hours", "hours", { unique: false });
    objectStore.createIndex("minutes", "minutes", { unique: false });
    objectStore.createIndex("day", "day", { unique: false });
    objectStore.createIndex("month", "month", { unique: false });
    objectStore.createIndex("year", "year", { unique: false });

    objectStore.createIndex("notified", "notified", { unique: false });
    
    note.innerHTML += '<li>Object store created.</li>';
  };

This next line opens up a transaction on the Database, then opens an object store that we can then manipulate the data inside of.

    var objectStore = db.transaction('toDoList').objectStore('toDoList'); 

Specifications

Specification Status Comment
Indexed Database API
The definition of 'IDBDatabase' in that specification.
Recommendation Initial version
Indexed Database API 2.0
The definition of 'IDBDatabase' in that specification.
Recommendation  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

24

23 — 57 webkit

Yes

16

10 — 16 moz

101157
Available in workers

Yes

23 — 57 webkit

Yes37 ? Yes ?
name

24

23 — 24 webkit

12

16

10 — 16 moz

101157
objectStoreNames

24

23 — 24 webkit

12

16

10 — 16 moz

101157
onabort

24

23 — 24 webkit

12

16

10 — 16 moz

101157
onclose312 Yes50 ? Yes10.1
onerror

24

23 — 24 webkit

12

16

10 — 16 moz

101157
onversionchange

24

23 — 24 webkit

?

16

10 — 16 moz

101157
version

24

23 — 24 webkit

12

16

10 — 16 moz

101157
close

24

23 — 24 webkit

12

16

10 — 16 moz

101157
createObjectStore

24

23 — 24 webkit

12

16

10 — 16 moz

101157
deleteObjectStore

24

23 — 24 webkit

12

16

10 — 16 moz

101157
transaction

24

23 — 24 webkit

12

16

10 — 16 moz

101157
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support

24

23 — 57 webkit

24

23 — 57 webkit

?22228

Yes

Yes — 7.0 webkit

Available in workers

Yes

23 — 57 webkit

Yes

23 — 57 webkit

Yes37 Yes ?

Yes

Yes — 7.0 webkit

name Yes Yes Yes22228 Yes
objectStoreNames Yes Yes Yes22228 Yes
onabort Yes Yes Yes22228 Yes
onclose Yes Yes Yes50 Yes10.1 Yes
onerror Yes Yes Yes22228 Yes
onversionchange Yes Yes ?22228 Yes
version Yes Yes Yes22228 Yes
close Yes Yes Yes22228 Yes
createObjectStore Yes Yes Yes22228 Yes
deleteObjectStore Yes Yes Yes22228 Yes
transaction Yes Yes Yes22228 Yes

1. partial

2. approx

See also

 

ডকুমেন্ট ট্যাগ এবং অবদানকারী

সর্বশেষ হালনাগাদ করেছেন: fscholz,