The Database class provides methods for working with HTML 5 SQLite databases in Palm's WebOS. It offers versions for both Enyo and Mojo (Enyo version is a Component, Mojo version a Prototype class). You can find full reference documentation within the inline comments or at http://onecrayon.github.com/database-webos

Installation

To use the class, download either database-mojo.js or database-enyo.js and put it somewhere in your app (I usually use a top-level javascripts folder for this kind of generic script).

Enyo (webOS 3.0+, Enyo 2-compatible)

Add a reference to the file in your appropriate depends.js file:

enyo.depends(
    "javascripts/database-enyo.js"
);

And then in your kind add the onecrayon.Database kind to your components:

components: [
    {
        name: "db",
        kind: "onecrayon.Database",
        database: 'ext:MyDatabase',
        version: "",
        debug: false
    }
]

After your create method has been called, you will then be able to access the database methods using this.$.db (in this case; may be different if you named it differently). So for instance:

this.$.db.setSchemaFromURL('schemas/schema.json', {
    onSuccess: enyo.bind(this, this.finishFirstRun)
});

Mojo (webOS 1.x-2.x)

Add the following line to your sources.json file:

{"source": "javascripts/database.js"}

And then in any of your assistants or other Javascript files you should be able to instantiate the class like so:

var db = new Database('ext:my_database', {version: '1', estimatedSize: 1048576});

Documentation

Currently all documentation for the class is inline in the source code. In particular, you should read the comments for setSchema, query, and queries as these are the main methods you will need in everyday usage.

Changelog

2.1

• Now supports Enyo 2.0; thanks Scott Miles!

2.0

• Rewritten from the ground up for Enyo

In the wild

The Database class is developed for and used by TapNote.

Let me know if you are using it, and I will note it here.

Released under an MIT license

Copyright (c) 2010-2012 Ian Beck

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