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📁 EasyObjects 是ORM的典型应用的例子是学习研究的很好的范例
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		<h1 class="dtH1">EasyObjects.NET</h1>
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		<p>Based on
		<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag2/html/entlib.asp">
		Microsoft's Enterprise Library </a>and
		<a href="http://www.mygenerationsoftware.com/portal/dOOdads/Overview/tabid/63/Default.aspx">
		MyGeneration's dOOdads</a>, EasyObjects.NET simplifies 
		development tasks that implement common data access functionality. 
		Applications can use EasyObjects.NET in a variety of situations, 
		such as reading data for display, passing data through application 
		layers, and submitting changed data back to the database system. 
		EasyObjects.NET includes support for both stored procedures and 
		in-line SQL, connection management, transaction management, null-value 
		handling and 
		dynamic query creation. In other words, EasyObjects.NET encapsulates 
		features often overlooked by developers in 
		simple-to-use classes, boosting developer productivity.</p>
		<p>EasyObjects.NET provides classes such as the <b>DynamicQuery</b> 
		class which helps to abstract the query mechanism from 
		any particular database implementation. The application developer can take advantage of 
		this class to build dynamic queries without having to learn 
		database-specific query language constructs. This allows applications to be 
		ported from one database type to another without modifying the client 
		code, or rewriting all the custom queries. The code for applications 
		written for one type of database, such as SQL Server, looks much the 
		same as the code for applications written for another type of database, 
		such as Oracle. EasyObjects.NET includes dynamic query providers for SQL 
		Server and Oracle, but developers can add custom providers and more will 
		be added in the future.</p>
		<p>Another feature of EasyObjects.NET is that application code can refer 
		to particular databases by a configuration 
		connection string name, such as &quot;DEV&quot; or &quot;PROD.&quot; The 
		application code can specify a named instance of a database by setting the
		<b>EasyObject.DatabaseInstanceName</b> property. Each 
		named database has its connection information stored in a configuration 
		file. Changing the settings in the configuration file allows developers 
		to use their applications with different database configurations, 
		without having to recompile their code.</p>
		<p>EasyObjects.NET provides the following benefits:</p>
		<ul>
			<li>It leverages the features and functionality provided by the Data 
			Access Application Block of the Enterprise Library. 
			</li>
			<li>It eliminates the need to write boilerplate code to perform 
			standard tasks. 
			</li>
			<li>In conjunction with code generation, it helps maintain consistent data access practices, both within 
			an application and across the enterprise. 
			</li>
			<li>It provides a consistent approach to writing application data 
			and business object layers.</li>
			<li>It reduces application development and maintenance cycles.</li>
			<li>It reduces difficulties in changing the database type.
			</li>
			<li>It relieves developers from learning different programming 
			models for different types of databases. 
			</li>
			<li>It reduces the amount of code that developers must write when 
			they port applications to different types of databases. </li>
		</ul>
		<h1 class="heading">&nbsp;</h1>
		<h1 class="heading">Common Scenarios</h1>
		<p>Developers often write applications that use databases. Because it is 
		so common, developers may find themselves writing the same code over and 
		over for each application. In addition, developers sometimes overlook 
		advanced features such as connection management different types of databases. Although the tasks are the same, 
		the code must be adapted to suit the programming model of each database. 
		EasyObjects.NET solves these problems by providing the 
		logic to perform the most common data access tasks, while incorporating 
		and simplifying advanced features. Developers only need 
		to do the following:</p>
		<ul>
			<li>Create the five standard stored procedures (select one, select 
			all, insert, update, delete) for the database table.</li>
			<li>Create the business entity object abstract class and concrete 
			class for the database table.
			</li>
			<li>Call the appropriate method(s). These methods are optimized for 
			performance. They are also portable.</li>
		</ul>
		<p>EasyObjects.NET works transparently with SQL Server 
		and Oracle databases.  </p>
		<h1 class="heading">&nbsp;</h1>
		<h1 class="heading">Audience Requirements</h1>
		<p>This guide is intended for software architects and software 
		developers. To benefit fully from this guide, you should have an 
		understanding of the following technologies:</p>
		<ul>
			<li>Microsoft
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