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Products Page |
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Joins
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All of the queries you have seen in this book so far have been simple SELECT statements from a single table. The true strength of a relational database comes from using multiple tables to contain normalized data. Data that has been normalized essentially means there is no duplicate data. Suppose you have a database containing employment information. Each employee has not only a job title but also a job description. Rather than have identical job descriptions in the Employee table for every employee with the same job, it is much better to have the job titles and descriptions in a separate Jobs table, and then refer to that Jobs record in the Employees table. There is said to be a relationship between the Employees table the Jobs table. Now, however, when you want to query the data, you must join the two tables back together in your query statement. This is done with the SQL keyword JOIN. The JOIN keyword alone, as used in the preceding snippet, is the default join type, known as an inner join. This means that any rows in either table that do not match the selection criteria will not be included in the results. There are many circumstances where you do not want to omit these records, in which case you must use an outer join. There are several different types of outer joins, including left, right, cross, and full, depending on which data specifically you want to include and which to omit. For a complete discussion on SQL queries in general and joins in particular, we highly recommend Transact-SQL Programming, by Kevin Kline et al. (O Reilly). Although this book is a bit dated, only covering up through SQL Server 7.0, the basic syntax has not changed, and this book remains a primary reference for SQL programming.
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Finally, add an event handler for the SelectedIndexChanged of the RadioButtonList rblCategories, which hides the detail Panel when a new category is selected. This prevents the details of the previous item remaining displayed.
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Protected Sub btnAddToCart_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) ' the contents of the cart will be saved in a Session object as ' a string of comma-delimited values of ProductID's Dim strCart As String = String.Empty Dim strProductId As String = gvProducts.SelectedDataKey.Value.ToString( ) If Session("Cart") Is Nothing Then strCart = strProductId Else strCart = Session("Cart").ToString( ) + ", " + strProductId End If
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10: Putting It All Together
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Session("Cart") = strCart lblCart.Text = strCart End Sub Protected Sub gvProducts_SelectedIndexChanged(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles gvProducts.SelectedIndexChanged pnlProduct.Visible = True End Sub Protected Sub gvProducts_RowDataBound(ByVal sender As Object, _ ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) _ Handles gvProducts.RowDataBound Dim str As String = String.Empty If e.Row.RowType = DataControlRowType.DataRow Then Dim cell As TableCell = e.Row.Cells(4) ' ListPrice cell Dim nCost As Decimal Try nCost = CType(cell.Text, Decimal) str = nCost.ToString("##,##0.00", Nothing) Catch ex As ApplicationException str = "n.a." Finally cell.Text = str End Try End If End Sub Protected Sub rblCategories_SelectedIndexChanged(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles rblCategories.SelectedIndexChanged pnlProduct.Visible = False End Sub
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The finished Products page, with several items added to the cart, is shown in Figure 10-10.
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Adding AJAX
It is pathetically easy to spice up the performance of the Products page with a little help from AJAX. All you need to do is wrap the entire contents of the Content control inside an UpdatePanel control. You can do this by dragging an UpdatePanel control from the AJAX Extensions section of the Toolbox onto the page in Design view, and then dragging all the existing content inside the UpdatePanel. Alternatively, go to Source view and add the following highlighted lines of code, wrapping the content of the Content control.
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