JavaScript Library to Bridge IndexedDB and WebSQL

Question

I\'m curious if there is a library or a project out there to provide a generic interface to IndexedDB or to WebSQL, depending on user\'s browser\'s support. If they\'re usin

Answer 1

I have written YDN-DB for the exact purpose. It is database wrapper for IndexedDB, WebSql and localStorage, build on the top of closure library.

Goal

Beautiful API for secure robust high-performance large-scale web app.

Features

• Support IndexedDB, Web SQL and localStorage storage mechanisms.
• Well tested closure library module.
• Support version migration, encryption, query and transaction.
• Each method call is an atomic transaction. All methods are asynchronous.
• Follow usual javascript etiquette like: single namespace, no global, no error globbing (unless we told you so in doc), no eval, parameterized query, this is this, coding error throw error.
• JQuery plugin available (see download section).

Basic usage

Import lastest minified JS script (see download section) to your HTML files. This will create single object in the global scope, call ydn.db.Storage.

var db = new ydn.db.Storage('db name');

db.setItem('x', 'some value')

db.getItem('x').success(function(value) {
  console.log('x = ' + value);
}

Query

Calculate average by using query

q = db.query('customer').average('age');
avg = q.fetch()

Key query

q = db.query('customer', 'age').bound(18, 25, true).where('sex', '=', 'FEMALE').select('full_name')
young_girl_names = q.fetch()

Transaction

p1 = db.key('player', 1);
db.transaction(function() {
   p1.get().success(function(p1_obj) {
        p1_obj.health += 10;
        p1.put(p123_obj);
   });
}, [p1]);

Encryption

String value data can be optionally encrypted using SHA-1 cipher.

db = new ydn.db.Store('store name')
db.setSecret(passphase); // generally send from server side upon login
db.setItem(key, value, 3600*1000); // data expire on one hour
db.getItem(key); // data will be decrypted using the provided passphase