Éric Lemoine
79 lines
2.6 KiB
JavaScript
79 lines
2.6 KiB
JavaScript
// Copyright 2011 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Wrappers for the HTML5 IndexedDB. The wrappers export nearly
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* the same interface as the standard API, but return goog.async.Deferred
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* objects instead of request objects and use Closure events. The wrapper works
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* and has been tested on Chrome version 18+. Though they should work in theory,
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* the wrapper tests fail in strange, non-deterministic ways on Firefox 6,
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* unfortunately.
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*
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* Example usage:
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*
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* <code>
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* goog.db.openDatabase('mydb').addCallback(function(db) {
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* return db.setVersion('1.0').addCallback(function(tx) {
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* db.createObjectStore('mystore');
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* // restart to see our structure changes
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* return goog.db.openDatabase('mydb');
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* });
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* }).addCallback(function(db) {
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* var putTx = db.createTransaction(
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* [],
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* goog.db.Transaction.TransactionMode.READ_WRITE);
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* var store = putTx.objectStore('mystore');
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* store.put('value', 'key');
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* goog.listen(putTx, goog.db.Transaction.EventTypes.COMPLETE, function() {
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* var getTx = db.createTransaction([]);
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* var request = getTx.objectStore('mystore').get('key');
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* request.addCallback(function(result) {
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* ...
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* });
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* });
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* </code>
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*
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*/
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goog.provide('goog.db');
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goog.require('goog.async.Deferred');
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goog.require('goog.db.Error');
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goog.require('goog.db.IndexedDb');
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/**
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* Opens a database connection and wraps it.
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*
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* @param {string} name The name of the database to open.
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* @return {!goog.async.Deferred} The deferred database object.
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*/
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goog.db.openDatabase = function(name) {
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var indexedDb = goog.global.indexedDB || goog.global.mozIndexedDB ||
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goog.global.webkitIndexedDB || goog.global.moz_indexedDB;
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var d = new goog.async.Deferred();
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var openRequest = indexedDb.open(name);
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openRequest.onsuccess = function(ev) {
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var db = new goog.db.IndexedDb(ev.target.result);
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d.callback(db);
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};
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openRequest.onerror = function(ev) {
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var msg = 'opening database ' + name;
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d.errback(new goog.db.Error(ev.target.code, msg));
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};
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return d;
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};
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