Shulou(Shulou.com)06/02 Report--

Today, I will talk to you about how to carry out .net FrameWork SDK data analysis, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Net FrameWork SDK updates the database with the data in DataSet through the database. When the data changes in .net FrameWork SDK, use Update,.Net FrameWork SDK to analyze the changes and execute the appropriate commands.

If the DataTable in DataSet is mapped to or generated from a single database table, you can use CommandBuilder objects to automatically generate DeleteCommand, InsertCommand, and UpdateCommand for DataAdapter. Use DataAdapter object manipulation DataSet to implement the specific implementation method of updating the database. Net FrameWork SDK only needs to add the following code listing 02 to code listing 01, and the combination of the two can delete the first row of data in the Customers data table:

TextBox1.DataBindings.Add ("Text", dsDataSet1, "Customers. CustomerID")

Because they do not understand the structure of DataSet and the relationship with the database, many beginners often just update the data in DataSet. Net FrameWork SDK thinks that the data in the database is also updated accordingly, so when opening the database to browse and find that the data is not updated, it will be more confusing, through the above introduction, doubts should be able to be eliminated.

XML and DataSet:

Data in DataSet can be created from XML data streams or documents. And .net Framework can control which data in the XML data stream or document is loaded and how the relational structure of the DataSet is created. Loading XML data streams and documents into DataSet is a ReadXml method that uses DataSet objects (note: ReadXml to load very large files will degrade performance). The ReadXml method reads from a file, stream, or XmlReader and takes the source of the XML and optional XmlReadMode parameters as parameters. The. Net FrameWork SDK method reads the contents of the XML stream or document and loads the data into the DataSet. It also creates a relational schema for DataSet, depending on whether the specified XmlReadMode and relational schema already exist.

DataSet and data binding (DataBinding)

Data binding is the most frequently used and most important technology in data binding technology, and it can also be said to be one of the basic knowledge that various .net development languages need to master to develop database applications. Data binding is important because the components related to database development are not provided in .net FrameWork SDK, that is, common components for database development, such as DbTextBox and DbLabel, are not available in .net FrameWork SDK. Data binding technology can "transform" TextBox components into DbTextBox components, Label components into DbLabel components, and so on. All of these are directly related to DataSet.

Data binding is divided into two categories: simple data binding and complex data binding. The components suitable for simple data binding are generally Lable, TextBox, etc., and the components suitable for complex data binding are DataGrid, ListBox, ComboBox and so on. In fact, there is no clear distinction between simple data binding and complex data binding, but when components are data binding, some components with more complex structure have similar operation steps at data binding time, while other components with simpler structure are similar in data binding. As a result, there are two categories. The following discusses the role and specific implementation methods of DataSet in realizing simple data binding and complex data binding by combining TextBox component and DataGrid component respectively.

After reading the above, do you have any further understanding of how to do .net FrameWork SDK data analysis? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.