IDBDatabase.createObjectStore()
The createObjectStore()
method of the
IDBDatabase
interface creates and returns a new IDBObjectStore
.
The method takes the name of the store as well as a parameter object that lets you define important optional properties. You can use the property to uniquely identify individual objects in the store. As the property is an identifier, it should be unique to every object, and every object should have that property.
This method can be called only within a versionchange
transaction.
Note: This feature is available in Web Workers
Syntax
IDBDatabase.createObjectStore(name);
IDBDatabase.createObjectStore(name, options);
Parameters
name
-
The name of the new object store to be created. Note that it is possible to create an object store with an empty name.
optionalParameters
Optional-
An options object whose attributes are optional parameters to the method. It includes the following properties:
Attribute Description keyPath
The key path to be used by the new object store. If empty or not specified, the object store is created without a key path and uses out-of-line keys. You can also pass in an array as a keyPath
.autoIncrement
If true
, the object store has a key generator. Defaults tofalse
.Unknown parameters are ignored.
Returns
A new IDBObjectStore
.
Exceptions
This method may raise a DOMException
with a DOMError
of
one of the following types:
InvalidStateError
DOMException
-
Thrown if the method was not called from a
versionchange
transaction callback. TransactionInactiveError
DOMException
-
Thrown if a request is made on a source database that does not exist (for example, when the database has been deleted or removed). In Firefox previous to version 41, an
InvalidStateError
was raised in this case as well, which was misleading; this has now been fixed (see bug 1176165). ConstraintError
DOMException
-
Thrown if an object store with the given name (based on a case-sensitive comparison) already exists in the connected database.
InvalidAccessError
DOMException
-
Thrown if
autoIncrement
is set to true andkeyPath
is either an empty string or an array containing an empty string.
Example
// Let us open our database
var request = window.indexedDB.open("toDoList", 4);
// This handler is called when a new version of the database
// is created, either when one has not been created before
// or when a new version number is submitted by calling
// window.indexedDB.open().
// This handler is only supported in recent browsers.
request.onupgradeneeded = event => {
var db = event.target.result;
db.onerror = event => {
note.innerHTML += "<li>Error loading database.</li>";
};
// Create an objectStore for this database
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>";
};
Specifications
Specification |
---|
Indexed Database API 3.0 # ref-for-dom-idbdatabase-createobjectstore① |
Browser compatibility
BCD tables only load in the browser
See also
- Using IndexedDB
- Starting transactions:
IDBDatabase
- Using transactions:
IDBTransaction
- Setting a range of keys:
IDBKeyRange
- Retrieving and making changes to your data:
IDBObjectStore
- Using cursors:
IDBCursor
- Reference example: To-do Notifications (view example live.)