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Subject: Using dojo.data | The Dojo Toolkit
Date: Sun, 2 Dec 2007 16:34:23 +0800
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<H2>Using dojo.data</H2><!--Node: -->
<DIV class=3Dnode>
<DIV class=3Dsubmitted>Submitted by criecke on Sun, 05/06/2007 - =
15:06.</DIV>
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<H2>What is dojo.data?</H2>
<P>Dojo.data is a uniform data access layer that removes the concepts of =

database drivers and unique data formats. All data is represented as an=20
<I>item</I> or as an attribute of an item. With such a representation, =
data can=20
be accessed in a standard fashion. Out of the box, dojo.data provides a =
basic=20
<CODE class=3D"geshifilter javascript">ItemFileReadStore</CODE> for =
reading a=20
particular format of JSON data. The DojoX project provides more stores =
(for=20
example, a simple XmlStore, a CsvStore, and an OmplStore) for working =
with=20
servers that can output data in such a format. In addition, dojo.data is =
an API=20
that other users can write to, so you can write one for a custom data =
format, a=20
specific subset of all the dojo.data APIs, or any other sort of =
customized data=20
handling service you want to work with. After you have your custom =
format=20
accessible using a datastore, widgets that are aware of datastores, and =
other=20
such code, can then access your data without having to learn new APIs =
specific=20
to your data.=20
<P>Ultimately, the goal of dojo.data is to provide a flexible set of =
APIs as=20
interfaces that datastores can be written to conform to. Stores that =
conform to=20
the standard interfaces should then be able to be used in a wide variety =
of=20
applications, widgets, and so on interchangeably. In essence, the API =
hides the=20
specific structure of the data, be it in JSON, XML, CSV, or some other =
data=20
format, and provides one way to access items and attributes of items=20
consistently. This also allows optimizations on data access to be placed =
where=20
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