asp.net textbox barcode scanner Building the Web Application in Microsoft Office

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Building the Web Application
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Data grid columns property builder screen
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Microsoft Office Access 2003 Professional Results
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Settings for the EmployeeID column
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The {0} indicates that the first data field should be used to fill in the string, which in this case will be the employee ID that will be passed to the payrollaspx page Your screen should now look like Figure 5-5 Finally, set up the Employee Detail and Salary History hyperlink columns the same way as for the Current Payroll column The HTML generated for the page is shown in Listing 5-7 The code generated for your page should be similar You can copy Listing 5-7 onto the page and then explore the DataGrid properties
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Listing 5-7
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<html> <head> </head> <body style="FONT-FAMILY: arial"> <h2>Employee Listing <hr size="1" />
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CHAPTER 5: Programming Microsoft Access with Web Matrix
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</h2> <form runat="server"> <p> <asp:datagrid id="dgEmployee" runat="server" CellSpacing="1" GridLines="None" CellPadding="3" BackColor="White" ForeColor="Black" EnableViewState="False" AutoGenerateColumns="False"> <HeaderStyle font-bold="True" forecolor="White" backcolor="#4A3C8C"></HeaderStyle> <ItemStyle backcolor="#DEDFDE"></ItemStyle> <Columns> <asp:BoundColumn DataField="EmployeeID" HeaderText="Employee ID"></asp:BoundColumn> <asp:BoundColumn DataField="First_Name" HeaderText="First Name"></asp:BoundColumn> <asp:BoundColumn DataField="Last_Name" HeaderText="Last Name"></asp:BoundColumn> <asp:HyperLinkColumn Text="Current Payroll" DataNavigateUrlField="EmployeeID" DataNavigateUrlFormatString="payrollaspx employeeid={0}"> </asp:HyperLinkColumn> <asp:HyperLinkColumn Text="Employee Detail" DataNavigateUrlField="EmployeeID" DataNavigateUrlFormatString="employeedetailaspx employeeid={0}"> </asp:HyperLinkColumn> <asp:HyperLinkColumn Text="Salary History" DataNavigateUrlField="EmployeeID" DataNavigateUrlFormatString="salaryhistoryaspx employeeid={0}"> </asp:HyperLinkColumn> </Columns> </asp:datagrid> </p> </form> </body> </html>
Building the Web Application
Note the tagging for the data grid columns Each of the properties set in the property builder is set in the column tags Now that the grid is built, we are ready to add the code to the page as well In the Web Matrix environment, click on the All tab We have to add a couple of namespace imports to the page for the NET systemdata classes This allows us to create the connections to the database and query for data Add the following code near the top of the page, right below the language=VB line:
<%@ import Namespace="SystemData" %> <%@ import Namespace="SystemDataSqlClient" %>
Microsoft Office Access 2003 Professional Results
FIGURE 5-5
Current payroll hyperlink column
Next, we are ready to work with the code for the page Click on the Code tab to switch to viewing only the code section of the page We need to add an event subroutine to the page that will be fired off when the page is loaded Within that subroutine, code will be executed to open the database connection and return the list of employees Listing 5-8 shows the code
Listing 5-8
Sub Page_Load(Sender As Object, E As EventArgs) Dim objCMD As New OleDbOleDbCommand() Dim objConn As New OleDbOleDbConnection() Dim strSQL As String Dim objDR As OleDbOleDbDataReader Dim strConn as string
CHAPTER 5: Programming Microsoft Access with Web Matrix
' First time the page is loaded If Not IsPostBack Then strConn = "PROVIDER=MicrosoftJetOLEDB40;" & _ "DATA SOURCE=c:\inetpub\wwwroot\employee\employeemdb;" ' Open a DB connection objConnConnectionString = strConn objConnOpen() ' Set the commad connection objCMDConnection = objConn ' Retrieve all of the data from the view strSQL = "select * from vw_employees order by last_name" ' Set the query objCMDCommandText = strSQL ' Set the data to read objDR = objCMDExecuteReader ' Set the grid data source dgEmployeeDataSource = objDR ' Show the data dgEmployeeDataBind() End If End Sub
Building the Web Application
The first thing that happens on the page is the creation of our variables and objects We are going to be using OLE DB provider to do our database connection to the Access database For that, we need an OLE DB connection, command object, and data reader objects To learn more about OLE DB, visit the following link on the Microsoft site: http://msdnmicrosoftcom/library/en-us/oledb/htm/oledbstartpage1 asp frame=true The connection string to the database points to our Access database Be sure to update this to point appropriately to your Access database Next, the connection to the database is opened by setting the connection object s connection string property to our connection string and using the open method Once the connection is open, then the command object s connection is set to the connection object
Microsoft Office Access 2003 Professional Results
Next, the query is built to retrieve the employees from the database In this case we are actually building a query against the employee query that we created Here, the query acts very much like a SQL view We can use all of the standard table query keywords with this view In this case we are ordering the employee listing by last name Once the query is created, we set it to the command text of the command object Then the execute reader method of the command object is called, which will return the data from the query in a suitable format for a data reader object The result is set to our data reader object Finally, we are ready to bind our data to the data grid The datasource property of our data grid object is set to the reader Then the bind method of the data grid is called That method essentially tells the data reader to walk through the data and display it per the setup of the columns To view the page, click on the start arrow on the toolbar That will give you the option of either running the built-in Web Matrix web server or using IIS Regarding the Web Matrix web server, Microsoft notes in the product documentation: This simple web server is automatically installed with ASPNET Web Matrix and does not require any other web server to be installed on your machine (ideal for quick development scenarios) http://wwwaspnet/webmatrix/tour/section1/runviamatrixwebaspx Choose either to use the Web Matrix web server or to have Web Matrix create an IIS application virtual root for running your pages Figure 5-6 shows the page in action once everything is set up and running The page is pretty simple We have the employees listing in alpha order by last name The Employee ID and first name are also displayed If you scroll your cursor over the hyperlinks, you will note the links to the pages as we defined them with the employee ID on the query string That is it for our first page Let s next work on the employee detail page, which will show the full data listing for an employee Create a new ASPNET file and save it as employeedetailaspx In this page we are going to build an HTML table with a set of rows where the employee data can be displayed There will be two columns in the table The left column will have HTML text that describes the data (eg, First Name:) The second column is where the employee data will be displayed The first step to creating the page is to click on the HTML view of the page Between the form tags, build a two-column table For the first column, ensure the text is aligned right (align= right ) For each left column, put in the name
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