5: Programming Microsoft Access with Web Matrix in Microsoft Office

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CHAPTER 5: Programming Microsoft Access with Web Matrix
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Now our page is ready to be displayed Start up the employeesaspx page and click on one of the Employee Detail links The detail data for the employee is displayed Figure 5-7 shows the page Let s next work on the salary history page For this page we want to retrieve and display the salary history for the employee Create a new ASPNET file and save it as salaryhistoryaspx To display the salary data, a DataGrid control will be utilized once again And, at the top of the page we will want to display the employee s name To get started, from the Design view, drag a DataGrid control from the Web control s tab onto the page Name it dgHistory Set the grid properties to those shown in Table 5-5 In this case, we want to display three columns of data: the start date, end date, and rate Following the property builder steps outlined earlier in the chapter, add in these three bound columns to the data grid At the top of the page, add a label that will be used to display the employee s name dynamically Name the label lblEmployee Below the label, add in a horizontal line from the HTML Elements toolbar
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Building the Web Application
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FIGURE 5-7
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Employee detail
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That is it for designing the HTML interface for the page Listing 5-12 shows the generated HTML code
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Listing 5-12
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<html> <head> </head> <body> <form runat="server"> <p> <asp:Label id="lblEmployee" runat="server" Font-Bold="True" Font-Size="X-Large">Label</asp:Label> </p> <h2> <hr size="1" /> </h2> <p> <asp:datagrid id="dgHistory" runat="server" AutoGenerateColumns="False" EnableViewState="False" ForeColor="Black" BackColor="White" CellPadding="3" GridLines="None" CellSpacing="1"> <HeaderStyle font-bold="True" forecolor="White" backcolor="#4A3C8C"></HeaderStyle> <ItemStyle backcolor="#DEDFDE"></ItemStyle> <Columns> <asp:BoundColumn DataField="Effective_StartDate" HeaderText="Start Date"></asp:BoundColumn> <asp:BoundColumn DataField="Effective_EndDate" HeaderText="End Date"></asp:BoundColumn> <asp:BoundColumn DataField="Hourly_Rate" HeaderText="Rate"></asp:BoundColumn> </Columns> </asp:datagrid> <!-- Insert content here --> </p> </form> </body> </html>
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There are no surprises in the HTML code for this page Next, we are ready to set up the code for the page First click on the All tab and add the following namespace imports to the top of the page:
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CHAPTER 5: Programming Microsoft Access with Web Matrix
<%@ import Namespace="SystemData" %> <%@ import Namespace="SystemDataSqlClient" %>
Next, click on the Code tab to switch to the Code view The technique followed on this page is similar to the employeesaspx page Listing 5-13 shows the code for the page
Listing 5-13
Sub Page_Load(Sender As Object, E As EventArgs) ' Only execute if not a form post back to this page If Not PageIsPostBack Then ' Call the subroutine to show the data BindGrid() End If End Sub Sub BindGrid() Dim objConn As New OleDbOleDbConnection() Dim objCMDGrid As New OleDbOleDbCommand() Dim objCMDEmp As New OleDbOleDbCommand() Dim objDRGrid As OleDbOleDbDataReader Dim objDREmp As OleDbOleDbDataReader Dim strSQL As String Dim strConn as string ' Set the connection to the database for OLEDB Access strConn = "PROVIDER=MicrosoftJetOLEDB40;" & _ "DATA SOURCE=c:\inetpub\wwwroot\employee\employeemdb;" ' Open a DB connection objConnConnectionString = strConn objConnOpen() ' Set the command connection objCMDGridConnection = objConn ' Set the command connection objCMDEmpConnection = objConn
Building the Web Application
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' Retrieve the rate history for the specified employee strSQL = "select * from vw_RateHistory where " & _ "RateHistory_employeeid = " & _ requestquerystring("employeeid") & _ " order by Effective_StartDate" Set the query objCMDGridCommandText = strSQL Set the data to read objDRGrid = objCMDGridExecuteReader ' Set the grid data source dgHistoryDataSource = objDRGrid ' Bind the grid to the data source and show the data dgHistoryDataBind() ' Close the data reader objDRGridclose ' Retrieve the employee data strSQL = "select * from vw_employees where employeeid = " & _ requestquerystring("employeeid") Set the query objCMDEmpCommandText = strSQL Set the data to read objDREmp = objCMDEmpExecuteReader ' Read the first record objDREmpread ' Show the employee name in the labels lblEmployeetext = objDREmpgetvalue(1) & _ " " & objDREmpgetvalue(2) End Sub
When the page is loaded the first time, the BindGrid routine is called to display the salary history data In the BindGrid subroutine, the first thing that happens is the setup of the OLE DB objects In this case, we are going to need two sets of
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