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Imports Imports Imports Imports Imports System System.Data System.Data.SqlClient System.Data.SqlTypes Microsoft.SqlServer.Server

Partial Public Class StoredProcedures <Microsoft.SqlServer.Server.SqlProcedure()> _ Public Shared Sub SalesRunningSum() Using conn As New SqlConnection("context connection=true") Dim comm As New SqlCommand comm.Connection = conn comm.CommandText = "" & _ "SELECT empid, dt, qty " & _ "FROM dbo.Sales " & _ "ORDER BY empid, dt;" Dim columns() As columns(0) = New columns(1) = New columns(2) = New columns(3) = New SqlMetaData = New SqlMetaData(3) {} SqlMetaData("empid", SqlDbType.Int) SqlMetaData("dt", SqlDbType.DateTime) SqlMetaData("qty", SqlDbType.Int) SqlMetaData("sumqty", SqlDbType.BigInt)

Dim record As New SqlDataRecord(columns)

SqlContext.Pipe.SendResultsStart(record) conn.Open() Dim reader As SqlDataReader = comm.ExecuteReader Dim prvempid As SqlInt32 = 0 Dim sumqty As SqlInt64 = 0 While (reader.Read()) Dim empid As SqlInt32 = reader.GetSqlInt32(0) Dim qty As SqlInt32 = reader.GetSqlInt32(2) If (empid = prvempid) Then sumqty = sumqty + qty Else sumqty = qty End If prvempid = empid record.SetSqlInt32(0, reader.GetSqlInt32(0)) record.SetSqlDateTime(1, reader.GetSqlDateTime(1)) record.SetSqlInt32(2, qty) record.SetSqlInt64(3, sumqty) SqlContext.Pipe.SendResultsRow(record) End While SqlContext.Pipe.SendResultsEnd() End Using End Sub End Class

time the menu.xml file is updated, we send a message that causes the ApplicationMenu to refresh itself. Figure 6.6 depicts the administrative interface to the ApplicationMenu.

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For this example, I tailored code that was originally provided by Adam Machanic in this blog post: http://sqlblog.com/blogs/adam_machanic/archive/2006/07/12/running-sums-yet-againsqlclr-saves-the-day.aspx . The code defining the procedure is pretty straightforward, and in essence it implements very similar logic to the T-SQL cursor solution I provided earlier . As for deploying the solution, remember that instructions are provided in Appendix A . If you deployed the assembly as instructed in Appendix A, the database CLRUtilities should already contain the procedure SalesRunningSum . Run the following code to execute the procedure:

EXEC dbo.SalesRunningSum;

Like the T-SQL cursor-based solution, the CLR-based solution also has linear complexity with respect to both the number of partitions and the partition size except that the former is about five times slower . I ran a benchmark to compare the different solutions and to show how they scale . Because all solutions scale linearly with respect to changes in number of partitions, I used a constant

The final two components in our architecture are the presentation components. In chapter 5, we introduced the combination of a filter, a servlet, and a bean as an implementation of the Model-View-Controller pattern. In this paradigm, the servlet acts as the controller receiving requests and choosing the appropriate combination of data (model) and presentation (view) to render to the caller. The bean acts as the model and is only concerned with data. The filter acts as the view and renders the data in the appropriate format. The flexibility of this paradigm allows us to implement a J2EE architecture that can easily handle multiple presentation formats with minimal impact to the underlying data. In our case study design, the BugAccessorBean and the ApplicationMenu act as the model. The DiagnosticApp is our controller servlet and the XSLTFilter is our view. Our current requirements indicate that we must produce only WML, but this presentation framework is flexible enough to accommodate additional presentation formats if necessary. Figure 6.7 is the complete class diagram for our application.

number of partitions . However, I did use varying partition sizes to show the different manner in which the solutions scale . The results of the benchmark are shown in Figure 8-2 .

Important Although the Bluetooth standard uses the same 2.4 GHz range as 802.11b and 802.11g, Bluetooth technology is not a suitable Wi-Fi replacement. Compared to Wi-Fi, Bluetooth networking is much slower, a bit more limited in range, and supports fewer devices.

Run Time (seconds)

200 300 400 500 600 700 800 # Rows per Partition (with 1,000 partitions) T-SQL Cursor CLR Data Reader

ApplicationMenu menu : ApplicationMenu menuJDOM : org.jdom.Document tcf : TopicConnectionFactory tConn : TopicConnection topic : Topic ts : TopicSession tSub : TopicSubscriber ApplicationMenu() getInstance() : ApplicationMenu loadMenu() getMenu() : org.jdom.Document registerListener() onMessage( Message ) ctx : Context

1,000

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