📄 complex-dataset.aspx
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<%@Page Language="VB"%>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.OleDb" %>
<%@ Register TagPrefix="wrox" TagName="connect" Src="..\global\connect-strings.ascx" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<title>Extracting Complex Data with a DataSet</title>
<!-- #include file="..\global\style.inc" -->
</head>
<body bgcolor="#ffffff">
<span class="heading">Extracting Complex Data with a DataSet</span><hr />
<!--------------------------------------------------------------------------->
<%'-- insert connection string script --%>
<wrox:connect id="ctlConnectStrings" runat="server"/>
<div>Connection string: <b><span id="outConnect" runat="server"></span></b></div>
<div>SELECT command: <b><span id="outSelect" runat="server"></span></b></div>
<div id="outError" runat="server"> </div>
<asp:datagrid id="dgrResult" runat="server" />
<script language="vb" runat="server">
Sub Page_Load()
'get connection string from ..\global\connect-strings.ascx user control
Dim strConnect = ctlConnectStrings.OLEDBConnectionString
outConnect.innerText = strConnect 'and display it
'specify the SELECT statement to extract the data
Dim strSelect As String
strSelect = "SELECT BookList.*, BookAuthors.FirstName, BookAuthors.LastName " _
& "FROM BookList INNER JOIN BookAuthors ON BookList.ISBN = BookAuthors.ISBN " _
& "WHERE BookList.ISBN LIKE '18610033%'"
outSelect.innerText = strSelect 'and display it
'declare a variable to hold a DataSet object
'note that we have to create it outside the Try..Catch block
'as this is a separate block and so is a different scope
Dim objDataSet As New DataSet()
Try
'create a new Connection object using the connection string
Dim objConnect As New OleDbConnection(strConnect)
'create a new DataAdapter using the connection object and select statement
Dim objDataAdapter As New OleDbDataAdapter(strSelect, objConnect)
'fill the dataset with data from the DataAdapter object
objDataAdapter.Fill(objDataSet, "Books")
Catch objError As Exception
'display error details
outError.innerHTML = "<b>* Error while accessing data</b>.<br />" _
& objError.Message & "<br />" & objError.Source
Exit Sub ' and stop execution
End Try
'assign the DefaultView to the DataGrid control
dgrResult.DataSource = objDataSet.Tables("Books").DefaultView
dgrResult.DataBind() 'and bind (display) the data
End Sub
</script>
<!--------------------------------------------------------------------------->
<!-- #include file="..\global\foot.inc" -->
</body>
</html>
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