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ADO.NET has two central components: data providers and datasets. A data provider connects to a data source and supports data access and manipulation. You ll play with three different ones later in this chapter. A dataset supports disconnected, independent caching of data in a relational fashion, updating the data source as required. A dataset contains one or more data tables. A data table is a row-and-column representation that provides much the same logical view as a SQL table. For example, you can store the data from the Northwind database s Employees table in a data table and manipulate the data as needed. You ll learn about datasets and data tables starting in 8. In Figure 4-1, notice the DataView class (in the System.Data namespace). This isn t a data provider component. Data views are used primarily to bind data to Windows and Web forms. We ll cover data views in 9. As you saw in Table 4-1, each data provider has its own namespace. In fact, each data provider is essentially an implementation of interfaces in the System.Data namespace, specialized for a specific type of data source. For example, if you use SQL Server, you should use the SQL Server data provider (System.Data.SqlClient) because it s the most efficient way to access SQL Server. The OLE DB data provider supports access to older versions of SQL Server as well as to other databases, such as Access, DB2, MySQL, and Oracle. However, native data providers (such as System.Data.OracleClient) are preferable for performance, since the OLE DB data provider works through two other layers, the OLE DB service component and the OLE DB provider, before reaching the data source.

A DataView object offers a view of the values in a DataTable Therefore, a DataView has the same number and order of columns as the DataTable used to define the DataView This is an important consideration because a DataTable has a richer structure than a DataView You can use the structure of a DataTable used to define a DataView and to navigate through the elements of a DataView The Button1_Click and the PrintView procedures jointly demonstrate how to view the values in the vew0Name and vew0ProductCategoryID DataView objects The Button1_Click procedure has two calls for the PrintView procedure The first call invokes the PrintView procedure for the vew0Name DataView The second PrintView call is for the vew0ProductCategoryID DataView.

Figure 4-2 illustrates the difference between using the SQL Server and OLE DB data providers to access a SQL Server database.

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The PrintView procedure takes three arguments: the name of a DataView for which to display values, the index value for a DataTable in the das1 DataSet, and a String value that specifies a heading for the report of the DataView values The declaration of the das1 variable as a DataSet is at the module level The variable is assigned a value in the Load procedure The PrintView procedure is quite general and will work for any DataView based on a DataTable in the das1 DataSet The following listing shows the code inside the Button1_Click procedure Each procedure call for PrintView specifies three argument values PrintView(vew0Name, 0, _ "ProductCategory by Name") PrintView(vew0ProductCategoryID, 0, _ "ProductCategory by ProductCategoryID") The PrintView procedure uses two nested For loops to iterate through successive columns of each row within the name of the DataView passed to it.

Exercise 8-3

The outer For loop passes through the rows of the view The Count property returns the number of rows in a DataView A DataView object does not have a Columns collection, but you can use the Columns collection for a DataView s underlying DataTable to pass through the columns of a DataView The inner loop for the code in the PrintView procedure demonstrates the syntax for accomplishing this goal The PrintView procedure constructs a String variable (str1) with the column values for successive rows in a DataView The procedure concludes by passing str1 to the Show method of the MessageBox class to present a message box with the values Sub PrintView(ByVal vew As DataView, _ ByVal tabindx As Integer, _ ByVal RepTitle As String).

If your application connects to an older version of SQL Server (6.5 or older) or to more than one kind of database server at the same time (for example, an Access and an Oracle database connected simultaneously), only then should you choose to use the OLE DB data provider. No hard-and-fast rules exist; you can use both the OLE DB data provider for SQL Server and the Oracle data provider (System.Data.OracleClient) if you want, but it s important you choose the best provider for your purpose. Given the performance benefits of the server-specific data providers, if you use SQL Server, 99% of the time you should be using the System.Data.SqlClient classes. Before we look at what each kind of data provider does and how it s used, you need to be clear on their core functionality. Each .NET data provider is designed to do the following two things very well: Provide access to data with an active connection to the data source Provide data transmission to and from disconnected datasets and data tables Database connections are established by using the data provider s connection class (for example, System.Data.SqlClient.SqlConnection). Other components such as data readers, commands, and data adapters support retrieving data, executing SQL statements, and reading or writing to datasets or data tables, respectively.

Dim str1 As String = RepTitle & StrDup(2, ControlChars.CrLf) For int1 As Integer = 0 To vew.Count - 1 For int2 As Integer = 0 To das1.Tables(tabindx).Columns.Count - 1 str1 += vew(int1)(int2).ToString & ", " Next str1 = Microsoft.VisualBasic.Left(str1, Len(str1) - 2) str1 += ControlChars.CrLf Next MsgBox(str1) End Sub

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