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Xiaobian to share with you how to use ADO. NET class library, I believe most people still do not know how to use, so share this article for your reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!

is a collection of records connected or disconnected (through the use of cursors), defined as a data table. A DataSet is a disconnected collection of records that can be used as a dataset in memory. Related to the data provider: Some data providers do not support some recordset methods and features. Instead, the different methods of a DataSet, such as querying, sorting, filtering, and updating, are independent of the data provider.

While newer versions of ADO allow recordsets to be saved or converted to XML so that data can be passed into applications and across firewalls, DataSets do not require conversion to accomplish the same task because DataSets are declared in XML. is non-typed, meaning it stores each piece of data as a variant. However, DataSets are strongly typed and store data as it is. Strongly typed means more formal programming and fewer errors.

Updating databases via ADO. NET class library recordset is cumbersome, inefficient, and has a low success rate. For example, if there are fifty records to be updated and one record cannot be updated, the database will reject the entire recordset. This problem does not exist in the DataSet because the DataSet can catch errors line by line through its rowerror feature. In addition to data, DataSets can also be added or modified with relationships, columns, tables, and similar objects without multiple database connections.

*** In a recordset, data is usually retrieved in a circular fashion. In ADO. NET class libraries, data views are created and bound to server controls so that data can be represented without mixing presentation and data access code. This is a very simple way of programming.

In short, DataSet and Recordset are completely different. A DataSet can be understood as an upgraded recordset. In the absence of testing and comparing the performance of DataSet and ADO recordset of ADO. NET class libraries, DataSet should be relatively effective.

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