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Dim dt As New DataTable( Customers ) Customer ID Column Dim col As New DataColumn( CustomerID ) col.DataType = Type.GetType( System.String ) col.MaxLength = 5 col.Unique = true col.AllowDBNull = false col.Caption = Customer ID dt.Columns.Add(col) Company Name Column col = New DataColumn( CompanyName ) col.DataType = Type.GetType( System.String ) col.MaxLength = 40 col.Unique = false col.AllowDBNull = false col.Caption = Company Name dt.Columns.Add(col)
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This code creates a DataTable and then adds a column for the CustomerID and another column for the CompanyName. The DataTable may still be populated using a DataAdapter or may be populated manually via other code. The DataColumn can also be a calculated column by assigning an expression to the column. This can be especially beneficial when data is available but not in the correct format. An example might be a DataTable that contains a Quantity and Price column, but a Total column is required. A new column can be created with an expression of Quantity * Price. The following same code creates a column with concatenation of the CustomerID and the CompanyName.
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Both Columns col = New DataColumn( Both ) col.DataType = Type.GetType( System.String ) col.MaxLength = 60 col.Unique = False col.AllowDBNull = True col.Caption = Both of them col.Expression = CustomerID + - + CompanyName dt.Columns.Add(col)
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Enumerating the DataTable It s often desirable to move through each row and each column of a DataTable. The following code shows how the rows and columns of a DataTable can be enumerated.
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Create objects Dim cnstr As String = integrated security=yes;database=northwind Dim cn As New SqlConnection(cnstr)
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Dim sql As String = Select * from customers Dim daCustomers As New SqlDataAdapter(sql, cn) Dim dt As New DataTable( Customers ) Execute daCustomers.Fill(dt) Build HTML Table Response.Write( <table border= 1 > ) Build the Column Headings Dim dcol As DataColumn Response.Write( <tr> ) For Each dcol In dt.Columns Response.Write( <th> ) This could also be the ColumnName property but the Caption is changeable to a user friendly appearance. Response.Write(dcol.Caption.ToString()) Response.Write( </th> ) Next Response.Write( </tr> ) Build Data Rows. Dim drow As DataRow For Each drow In dt.Rows Response.Write( <tr> ) Build Data Columns. Dim ditem As Object For Each ditem In drow.ItemArray Response.Write( <td> ) Response.Write(ditem.ToString()) Response.Write( </td> ) Next Response.Write( </tr> ) Next Response.Write( </table> ) Cleanup dt.Dispose() daCustomers.Dispose() cn.Dispose()
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This code fills a DataTable, then builds an HTML table by writing the table tag; then, the column headers are written by retrieving the caption of each column. Finally, the DataRows are enumerated, and for each column in a DataRow, the object data in the column is written to the browser.
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A DataView is a window into a DataTable. A DataTable can have many DataViews assigned to it, which allows the data to be viewed in many different ways without requiring the data to be read again from the database.
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The following code sample shows the use of the RowFilter to view customers whose CustomerID begins with the letter A.
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Create objects Dim cnstr As String = integrated security=yes;database=northwind Dim cn As New SqlConnection(cnstr) Dim sql As String = Select CustomerID, CompanyName from customers Dim daCustomers As New SqlDataAdapter(sql, cn) Dim dt As New DataTable( Customers ) Execute daCustomers.Fill(dt) Dim dv As New DataView( ) dv.Table = dt dv.RowFilter = CustomerID like A% DataGrid1.DataSource = dv DataBind( )
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Notice that the DataView is assigned to a DataTable. The RowFilter represents a SQL where clause. The DataGrid s DataSource is assigned directly to the DataView. The next code sample shows the use of the Sort property to sort the customers on the Region in ascending order, followed by the CompanyName in descending order.
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Create objects Dim cnstr As String = integrated security=yes;database=northwind Dim cn As New SqlConnection(cnstr) Dim sql As String = Select CustomerID, CompanyName from customers Dim daCustomers As New SqlDataAdapter(sql, cn) Dim dt As New DataTable( Customers ) Execute daCustomers.Fill(dt) Dim dv As New DataView() dv.Table = dt dv.Sort = Region ASC, CompanyName DESC DataGrid1.DataSource = dv DataBind()
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The sort expression is the SQL order by clause. Notice that the sort columns are comma separated, and ASC or DESC can be supplied to indicate ascending or descending order, respectively. The following example shows the use of the RowStateFilter to view rows that are marked for deletion.
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Create objects Dim cnstr As String = integrated security=yes;database=northwind Dim cn As New SqlConnection(cnstr) Dim sql As String = Select * from customers
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