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<page>
	<meta>
		<title>AnyDataSet and Data Access</title>
		<abstract>How to use the Iterator and the variations of AnyDataSet to access various types of data</abstract>
		<created>15/8/2006 13:12:42</created>
		<modified>Sat Sep 13 2008 18:40:24</modified>
		<keyword>xmlnuke</keyword>
		<groupkeyword>key_xmlnukeconcepts</groupkeyword>
	</meta>
	<blockcenter>
		<title>AnyDataSet</title>
		<body>
			<p>AnyDataSet is a module to store a small quantity of data. The file structure of an AnyDataSet is very similar to the structure of a relational storage, but the physical persistence occurs in an XML document. However, this does not follow a rigid orientation of data definition, so that every entry can have their own field structure.</p>
<p><code information="Example of an XML from an AnyDataSet"><![CDATA[
<anydataset>
  <row>
    <field name="key1">Value 1</field>
    <field name="key2">Value 2</field>
    <field name="key3">Value 3</field>
  </row>
  <row>
    <field name="key1">Value 1</field>
    <field name="key2">Value 2</field>
  </row>
</anydataset>]]></code>
</p>
		</body>
	</blockcenter>
	<blockcenter>
		<title>Iterating an AnyDataSet - IIterator</title>
		<body>
<p>The AnyDataSet has a mechanism to iterate through the structure called an Iterator. This is very interesting because it establishes a standard method to iterate through the entire data structure in a singular way.</p>

<p>Currently, all of the objects to access data through XMLNuke implement the same Iterator interface; in other words, it doesn?t matter if you access a database or an XML file, since the method of obtaining this data will always be the same!</p>

<p>Currently, XMLNuke implements the following methods of accessing data:
<ul>
  <li>XML Files - AnyDataSet</li>
  <li>Database, various sources - DBDataSet (<a href="engine:xmlnuke?xml=bd_1">see more</a>)</li>
  <li>CSV Files, local and remote - TextFileDataSet</li>
  <li>Array and Vectors - ArrayDataSet</li>
  <li>DataSet .NET object - DSDataSet</li>
</ul>

All of these cases have a method which returns an Iterator type object and that makes it possible for one method to iterate through the most varied types of databases in the same way.
</p>
<p>For example, an <a href="engine:xmlnuke?xml=creatingmodule_4">XmlEditList</a> object can be set up by any data source, whether a database, an XML file or an array, for example.
</p>

<p>For more information on how to access the AnyDataSet, access the <a href="engine:xmlnuke?xml=technicalref_3">technical reference</a>.</p>
		</body>
	</blockcenter>
</page>
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