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This is an old revision of this page, as edited by 2409:408a:79c:c35f:bf81:180b:2aeb:10f2 (talk) at 05:09, 18 February 2025 (Toggle Sidebar MODELS New Get App You interface Database { void transaction(in SQLTransactionCallback callback, [Optional] in SQLTransactionErrorCallback errorCallback, [Optional] in SQLVoidCallback successCallback); void readTransaction(in SQLTransactionCallback callback, [Optional] in SQLTransactionErrorCallback errorCallback, [Optional] in SQLVoidCallback successCallback); readonly attribute DOMString version; void changeVersion(in DOMString oldVersion, in DOMString newVersion, in SQLTr). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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interface Database { void transaction(in SQLTransactionCallback callback, [Optional] in SQLTransactionErrorCallback errorCallback, [Optional] in SQLVoidCallback successCallback); void readTransaction(in SQLTransactionCallback callback, [Optional] in SQLTransactionErrorCallback errorCallback, [Optional] in SQLVoidCallback successCallback);

readonly attribute DOMString version; void changeVersion(in DOMString oldVersion, in DOMString newVersion, in SQLTransactionCallback callback, in SQLTransactionErrorCallback errorCallback, in SQLVoidCallback successCallback); };

[Callback=FunctionOnly, NoInterfaceObject] interface SQLVoidCallback { void handleEvent(); };

[Callback=FunctionOnly, NoInterfaceObject] interface SQLTransactionCallback { void handleEvent(in SQLTransaction transaction); };

[Callback=FunctionOnly, NoInterfaceObject] interface SQLTransactionErrorCallback { void handleEvent(in SQLError error); };

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The provided code snippet defines a JavaScript interface for a database API, likely inspired by the Web SQL Database API. This interface outlines methods for managing transactions, reading data, and changing the database version, along with associated callback interfaces for handling success and error events.

Here's a breakdown of the components:

Database Interface

  • Methods:
    • transaction: Initiates a transaction. It takes a SQLTransactionCallback for handling the transaction, an optional SQLTransactionErrorCallback for handling errors, and an optional SQLVoidCallback for handling success.
    • readTransaction: Similar to transaction, but specifically for read-only transactions.
    • changeVersion: Changes the database version. It requires the old and new version strings, a SQLTransactionCallback, a SQLTransactionErrorCallback, and a SQLVoidCallback.
  • Attributes:
    • version: A read-only attribute that returns the current version of the database.

Callback Interfaces

  • SQLVoidCallback: A callback interface with a single method handleEvent that is called when an operation completes successfully.
  • SQLTransactionCallback: A callback interface with a method handleEvent that receives a SQLTransaction object, allowing the caller to perform operations within the transaction.
  • SQLTransactionErrorCallback: A callback interface with a method handleEvent that receives a SQLError object, allowing the caller to handle errors that occur during a transaction.

Usage Example

Here’s a hypothetical example of how you might use this interface in practice:

Notes

  • The use of Optional in the method signatures indicates that the error and success callbacks are not mandatory, allowing for flexibility in how the API is used.
  • The FunctionOnly and NoInterfaceObject annotations suggest that these callback interfaces are intended to be used as function types rather than as standalone objects.

This interface design is typical for asynchronous operations in JavaScript, where callbacks are used to handle the results of operations that may take time to complete, such as database transactions.

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Radio

  • WEBS (AM), a radio station licensed to Calhoun, Georgia, United States
  • West End Broadcast (WeB FM), a radio station in Newcastle, England, that was a forerunner of NE1fm

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Other uses

  • West-East Bag, an international women artists network active from 1971 to 1973

See also