IDBObjectStoreSync - Web APIs 编辑

Important: The synchronous version of the IndexedDB API was originally intended for use only with Web Workers, and was eventually removed from the spec because its need was questionable. It may however be reintroduced in the future if there is enough demand from web developers.

The IDBObjectStoreSync interface of the IndexedDB API provides synchronous access to an object store of a database.

Method overview

Attributes

 Constants

Mode constants

Methods

add()

Stores the given value into this object store, optionally with the specified key. If a record already exists with the given key, an exception is raised.

any add(
  in any value,
  in optional any key
) raises (IDBDatabaseException);

Parameters

Returns

Exceptions

This method can raise a IDBDatabaseException with the following codes:

value

The value to store into the index.

key

A key to use for identifying the record.

any

The key for the stored record.

CONSTRAINT_ERR

If a record exists in this index with a key corresponding to the key parameter or the index is auto-populated, or if no record exists with a key corresponding to the value parameter in the index's referenced object store.

DATA_ERR

If this object store uses out-of-line keys, and the key parameter was not passed.

SERIAL_ERR

If the data being stored could not be serialized by the internal structured cloning algorithm.

createIndex()

Creates and returns a new index with the given name in the connected database.

 IDBIndexSync createIndex (
    in DOMString name,
    in DOMString keypath,
    in optional boolean unique
 );

Parameters

name

The name of a new index.

keyPath

The key path used by the new index.

unique

If true, keys in the index must be unique; if false, duplicate keys are allowed.

Returns

IDBIndexSync

An object to access the newly created index.

get()

Retrieves and returns the value from this object store for the record that corresponds to the given key.

any get (
  in any key
) raises (IDBDatabaseException);

Parameters

key

The key that identifies the record to be retrieved.

Returns

any

The value retrieved from the object store.

Exceptions

This method can raise a IDBDatabaseException with the following codes:

SERIAL_ERR

If the data being stored could not be deserialized by the internal structured cloning algorithm.

NOT_FOUND_ERR

If no record exists in this index for the given key.

openCursor()

Creates a cursor over the records of this object store. The range of the new cursor matches the specified key range; if the key range is not specified or is null, then the range includes all the records.

CursorSync openCursor (
  in optional KeyRange range,
  in optional unsigned short direction
) raises (DatabaseException);

Parameters

range

The key range to use as the cursor's range.

direction

The cursor's required direction.

Returns

IDBIndexSync

An object for accessing the index.

Exceptions

This method can raise a DatabaseException with the following code:

NOT_FOUND_ERR

If no records exist in this index for the requested key range.

openIndex()

Opens the index with the given name, using the mode of the current transaction.

 IDBIndexSync openIndex (
   in DOMString name
 ) raises  (IDBDatabaseException);

Parameters

name

The name of the index to open.

Returns

IDBIndexSync

An object to access the index.

Exceptions

This method can raise an IDBDatabaseException with the following code:

NOT_FOUND_ERR

If the index with the given name does not exist in the connected database.

put()

Stores the given value in this object store and returns the key for the stored record. If a record already exists with the given key, it is overwritten.

any put (
  in any value,
  in optional any key
) raises (IDBDatabaseException);

Parameters

value

The value to be stored in the record.

key

The key to be used to identify the record.

Returns

any

The key for the stored record.

Exceptions

This method can raise an IDBDatabaseException with the following codes:

CONSTRAINT_ERR

If noOverwrite was true, and a record exists in this index for the given key or this index is auto-populated; or if no record exists with the given key in the index's referenced object store.

DATA_ERR

If this object store uses out-of-line keys and no key generator, but no key was given.

SERIAL_ERR

If the data being stored could not be serialized by the internal structured cloning algorithm.

remove()

Removes from this object store any records that correspond to the given key.

void remove (
  in any key
) raises (IDBDatabaseException);

Parameters

key

Key of the records to be removed.

Returns

void

Exceptions

This method can raise a IDBDatabaseException with the following code:

NOT_FOUND_ERR

If a record does not exist in this index with the given key.

removeIndex()

Destroys an index with the given name.

  void removeIndex (
    in DOMString indexName
  ) raises (IDBDatabaseException);

Parameters

indexName

The name of the existing index to remove.

Exceptions

This method can raise an IDBDatabaseException with the following code:

NOT_FOUND_ERR

If an index with the given name does not exist in the connected database.