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The StringArray type can be used to solve development problems that might require the full power afforded by a CLR function or stored procedure, but are easier to handle using data structures that are not built into SQL Server. An instance of the StringArray can be initially populated from a comma-delimited list, as in the following code: DECLARE @array StringArray SET @array = 'a,b,c' As a result of this code, the @array variable contains three elements, which can be retrieved or deleted using the GetAt or RemoveAt methods. An extension to the type might be to add a SetAt method to replace existing values in the array, but we ll leave that as an exercise for interested readers. Interestingly, the SQL CLR engine only blocks modification of null types via public mutators public methods that happen to perform modification are allowed. So using the AddString method is an option at any time, whether or not the type is null. The following code will have the same end result as the previous code. DECLARE @array StringArray SET @array = @array.AddString('a') SET @array = @array.AddString('b') SET @array = @array.AddString('c')

Figure 7-19. The expense worksheet and the expense graph applications on the same page Before we discuss the local-connection-related code changes, let s quickly look at the XAML for the expense worksheet application, shown in Listing 7-39.

If an assembly has been loaded into the database using CREATE ASSEMBLY, types can be created or dropped without using the Visual Studio deployment task, as assumed in most examples in this chapter.

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If you are an experienced business intelligence professional, you may challenge the assertion that gauges or meters are too rich or too noisy when compared to a bullet graph. While it is true that you can turn off a lot of the extra features and make gauges or meters render simply. they just don t look as natural as a bullet graph. Figure B-8 shows a stripped down version of a gauge and a meter without extra features. As you can see, the control looks like it s missing something. That s because it wasn t designed to look this way. If you look on any component vendor s site, they show demos of pretty and appealing data visualizations to catch the eye. This is the main reason why stripping out optional components on a gauge or meter makes the controls inelegant.

Listing 7-39. XAML for the HomeExpenseWorksheet Application in MainPage.xaml <UserControl x:Class="Ch07_Networking.Recipe7_8.HomeExpenseWorksheet.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:data= "clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data" Width="300" Height="600"> <Grid x:Name="LayoutRoot" Background="White"> <Grid.RowDefinitions> <RowDefinition Height="0.8*" /> <RowDefinition Height="0.2*" /> </Grid.RowDefinitions> <data:DataGrid HorizontalAlignment="Stretch" Margin="8,8,8,8" VerticalAlignment="Stretch" HeadersVisibility="All" Grid.Row="0" x:Name="dgSpending" AutoGenerateColumns="False" CellEditEnded="dgSpending_CellEditEnded"> <data:DataGrid.Columns> <data:DataGridTextColumn Header="Item" Binding="{Binding Item,Mode=TwoWay}" /> <data:DataGridTextColumn Header="Value" Width="100" Binding="{Binding Amount,Mode=TwoWay}" /> </data:DataGrid.Columns> </data:DataGrid> <StackPanel Orientation="Horizontal" Grid.Row="1" HorizontalAlignment="Right"> <Button x:Name="btnAddItem" Margin="3,3,3,3" Height="30" Width="85" Content="Add Item" Click="btnAddItem_Click" />

To manually create a type that is exposed in an assembly, without using the deployment task, use the T-SQL CREATE TYPE statement and specify the name of the assembly and name of the structure or class that defines the type. The following code creates the StringArray type from an assembly called StringArray: CREATE TYPE StringArray EXTERNAL NAME StringArray.StringArray To drop a type, use DROP TYPE. A type cannot be dropped if it is referenced by a table or function. The following code drops the StringArray type: DROP TYPE StringArray The sys.types catalog view exposes information about both system and user-defined types. To enumerate the data for CLR user-defined types in the database, use the is_assembly_type column: SELECT * FROM sys.types WHERE is_assembly_type = 1

Figure B-8. Stripped down versions of the SQL Server 2008 R2 Reporting Services gauge and meter controls SQL Server 2008 R2 Reporting Services includes an implementation of a bullet graph. However, the default style of the bullet graph includes unnecessary borders, shadows, and gradients that take away from the main point of the bullet graph, which is to deliver analytical insight in a simple control. All the extra items do look nice and demo well, but they do not improve the analytical behavior of the control. Figure B-9 below shows the default look of a SQL Server 2008 R2 Reporting Services bullet graph.

SQL Server 2000 introduced T-SQL user-defined functions, a feature that has greatly improved the programmability of SQL Server Scalar user-defined functions allow developers to easily maximize encapsulation and reuse of logic They return a single, scalar value based on zero or more parameters These types of functions are useful for defining black-box methods; for instance, logic that needs to be used in exactly the same way throughout many stored procedures can be embedded in a scalar function If the logic ever needs to change, only the function needs to be modified Tablevalued user-defined functions, on the other hand, can be thought of as parameterized views These functions return a rowset of one or more columns and are useful for situations in which a view can return too much data Because these functions are parameterized, developers can force users to filter the returned data.

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