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This article mainly explains "how to understand the ADO.NET object model". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to understand the ADO.NET object model".

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After understanding the purpose of the ADO.NET object model and its place in the entire Visual Studio architecture, let's take a closer look at this technology. This chapter provides a brief introduction to the ADO.NET object model and how it differs from Microsoft's previous data access technologies.

ADO.NET is designed to help developers develop efficient multi-tier database applications for use on Intranet and Internet, and the ADO.NET object model provides such a means. Figure 1.1 shows the class that contains the ADO.NET object model. The dotted line in the middle divides the object model into two parts. The object to the left of the dotted line is the connected object. These objects communicate directly with the database to manage connections and transactions, as well as retrieve data from the database and commit changes to the database. The object to the right of the dotted line is a disconnected object that allows the user to process data offline.

Objects consisting of unconnected parts of the ADO.NET object model do not communicate directly with connected objects. This is an important change to Microsoft's previous data access object model. In ADO, the Recordset object stores the results of the query. You can call its Open method to extract the query results and call its Update (or UpdateBatch) method to submit changes stored in Recordset to the database.

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