![]() ![]() ![]() Working Offline: CachingĬordova provides two options for persisting your applications data: Web SQL and LocalStorage. The W3C docs help fill in some things that the Cordova documentation doesn’t cover, such as error-handling and labels for SQLError. In this tutorial, we will briefly cover using Web SQL on Cordova for storage on mobile devices.īefore proceeding, please carefully read Cordova’s Storage documentation along with the W3C spec for Web SQL Database support. ![]() Apache Cordova – AndroidĪpache Cordova (aka PhoneGap) is an HTML5 application platform that allows you to author native applications with web technologies and get access to APIs and app stores. This tutorial will focus on storage options provided by Apache Cordova to store structured data in a database. Filesystem – You can use the Internal/External storage options.Database – You should use SQLite if you need to store structured data.Application Properties – You can use SharePreferences here.The decision about which of the Android storage options you choose is usually determined by the following: Persistence Strategy: What kind of data storage should I use? Network Connection – Store data on the web with your own network server.SQLite Databases – Store structured data in a private database.External Storage – Store public data in shared external storage.Internal Storage – Store private data in device memory.Shared Preferences – Store private primitive data in key-value pairs.The following are the available Android data storage options: It is important for you to carefully read the official Android Storage Options documentation. Android Storage QuickviewĪndroid supports many storage options for persisting application data. An application can save its state into a datastore, which can be a relational database (RDBMS) such as MySQL, a flat file, or an XML file. Persistence is a means of saving an application’s state, which makes it one of the most important qualities necessary to reuse an application. Return this._db.If you haven’t seen the first three parts of this Beginning Android tutorial series, please take some time to read it before reading this article. Note: SQLite is slower than IndexedDB/WebSQL as mentioned in this article by Nolan Lawson. this is no longer the case, I've updated this tutorial to include the extra steps needed to use SQLite on the mobile devices. PouchDB will automatically use SQLite if you have installed a Cordova plugin for it and have configured it to use a WebSQL adapter. There are storage limits for IndexedDB and WebSQL databases, so if you want unlimited and reliable storage on a mobile device, you're better off using SQLite. And then there is the out-of-the-box syncing with a server, but in this tutorial, we'll only focus on local storage. What I like about PouchDB is that it uses a NoSQL approach to database storage, which greatly simplifies the code you need to write. ![]() It's inspired by Apache CouchDB and allows you to sync your local data with a CouchDB server. PouchDB is an open-source JavaScript library that uses IndexedDB or WebSQL to store data in the browser. I recommend you read my new tutorial using ngrx and Observables after you're finished with this one.= =Update: In this tutorial, I'm using Promises for the CRUD operations on PouchDB. =Update: The code in this tutorial is now up to date with Ionic 2.0.0-rc.4 (December 2016)= Now that Ionic 2 is in beta, I've updated the tutorial for Ionic 2 and the recently released Cordova SQLite Plugin 2. 18 April 2016 PouchDB, SQLite, Ionic 2+, Angular 2+, TypeScript, Local StorageĪ year ago I wrote a tutorial on how to use PouchDB + SQLite for an Ionic 1 app. ![]()
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