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Trends come and go, but your DB strategy shouldn’t be a flavor of the month.Learn why you shouldn’t get distracted by new DB technology, how Facebook is using a RDBMS to do the data slicing and dicing they can’t in Hadoop, and more. NET and typed Data Sets are the preferred method for retrieving and updating relational tables, although Data Sets aren't limited to processing relational data.You create typed Data Sets, which are defined by an XML schema and implemented by a very large amount of auto-generated VB 2005 code, with VS 2005 designers.Untyped Data Sets are runtime objects that you create with code. The section "Add a Data Grid View and Data Navigator Controls," later in this chapter, describes how the Binding Source fits into ADO. The following sections show you alternative methods for generating Figure 1-5's ADO.aspdotnet-suresh offers C#articles and tutorials,csharp dot net,articles and tutorials, VB.
Adding a typed Data Set generates an XSD schema, Northwind Data for this example, and adds 1,197 lines of VB 2005 code to the Northwind Data Set. Partial classes are a new VB 2005 and C# feature that enable extending a class, such as Northwind Data Set, with additional class files. Read Xml(str Path "Custs No Schema.xml", Xml Read Mode.The part of the schema that defines the elements for the table fields grows from 30 to 94 lines because element definitions now contain max Length attribute values and use restriction Base attributes to specify XSD data types. The section "Create a Complete Data Entry Form in One Step," later in this chapter, includes code to save the schema for the Northwind Customers Data Set. Changes you make to the Data Grid View don't propagate to the table until you click the Save Data button. Delete the Data Grid View control, display the Data Sources window, open the dropdown list for the Data Table, and select Details, as shown in Figure 1-13.You can't open the saved schema in the project's Schema Designer. To make editing easier, you can automate increasing the column widths to match the content by setting the Data Grid View's Auto Size Columns Mode property value to All Cells or Displayed Cells, which adds a horizontal scrollbar to the control. Figure 1-13 Drag the Data Table icon to the form to automatically add a column of labels with associated data-bound Controls -- text boxes for this example -- to the form.Dragging the Customers table node from the Data Sources window to your project's default Form1 autogenerates four components in the tray below the form designer and adds Data Grid View and Data Navigator controls to a dramatically expanded form, as shown in Figure 1-11. Private Sub frm Data Grid View_Load(By Val sender As System. Add a Related Data Bound Control You can add a related table to the Data Sources window and then add a control, such as a Data Grid View, that you bind to the related Binding Adapter. Correct any object name errors that the debugger reports. Open the Data Source window, and click the Configure Data Set with Wizard button to open the Choose Your Database Objects page. Expand the Tables node, mark the Orders table checkbox, and click Finish, which adds in the Data Sources window a related Orders node to the Customers table and a standalone Orders node (see Figure 1-15). With Data Grid View selected in the dropdown list, drag the related Orders node below the bound text boxes of the form to autogenerate an Orders Data Grid View control. Adjust the size and location of the controls, and set the Orders Data Grid View . Figure 1-16 Dragging the related Orders table node to the form adds an Orders Table Adapter and Orders Binding Source to the tray and the Orders Data Grid View control to the form.
Figure 1-11 "Surfacing" is a common term for adding data and other components to the tray. Customers) End Sub Private Sub data Navigator Save Item_Click(By Val sender As System. To add a related Orders Data Grid View control to a copy of the Generated Detail project, do the following: 1. Auto Size Rows Mode property value to Displayed Cells. The Orders Data Grid View control's Data Source property value is the Orders Binding Source.Figure 1-5 compares the objects required by updatable ADODB Recordsets and ADO. Table Adapters and Data Sets also appear in the Toolbox's Project Name Components section; the Data section has Data Set, Binding Source, and Binding Navigator controls.