IDBIndexSync - Web APIs 编辑

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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 IDBIndexSync interface of the IndexedDB API provides synchronous access to an index in a database.

Method overview

Attributes

Methods

add()

Stores the given value into this index, 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 code:

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.

get()

Retrieves the value from this index 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 retrieved value from the index.

Exceptions

This method can raise an IDBDatabaseException with the following code:

NOT_FOUND_ERR

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

getObject()

Retrieves and returns the value from this index's referenced object store that corresponds to the given key.

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

Parameters

key

The key that identifies the record to be retrieved.

Returns

any

The retrieved value from the referenced object store.

Exceptions

This method can raise a IDBDatabaseException with the following code:

NOT_FOUND_ERR

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

openCursor()

Creates a cursor over the records of this index. 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.

void openCursor (
  in optional IDBKeyRange range,
  in optional unsigned short direction
) raises (IDBDatabaseException);

Parameters

range

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

direction

The cursor's required direction.

Returns

void

Exceptions

This method can raise an IDBDatabaseException with the following code:

NOT_FOUND_ERR

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

openObjectCursor()

Creates a cursor over the records of this index's referenced object store, as arranged by this index. 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.

void openObjectCursor (
  in optional IDBKeyRange range,
  in optional unsigned short direction
) raises (IDBDatabaseException);

Parameters

range

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

direction

The cursor's required direction.

Returns

void

Exceptions

This method can raise an IDBDatabaseException with the following code:

NOT_FOUND_ERR

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

put()

Stores the given value in this index and returns the key for the stored record. If a record already exists with the given key, the record 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.

remove()

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

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

Parameters

key

Key of the records to be removed.

Exceptions

This method can raise a DatabaseException with the following code:

NOT_FOUND_ERR

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