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vb.net data matrix reader

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Try Dim count As Integer = friends.GetAttendees( _ ConfigurationSettings.AppSettings("PlaceID")) txtCount.Text = count.ToString() Catch se As SoapException lblError.Text = String.Format( _ "<h2>An error happened connecting to Friends Reunion service.</h2>" & _ "<h3>Service location: {0}</h3>" & _ "Error: <br/>{1}", se.Actor, se.Message) lblError.Visible = True End Try End Sub 6. Since you are catching a SoapException, you need to import the following namespace at the top of the code in this file: Imports System.Web.Services.Protocols 7. Modify the Web.config file in the test application, adding some characters at the end of the PlaceID in <appSettings>, to make it an invalid GUID. 8. Start the project. You should now get the message stating the error occurred. However, it doesn t simply contain the text that you would expect: Error: Invalid Place identifier! Rather, you ll be presented with something like this: Error: System.Web.Services.Protocols.SoapException: Invalid Place identifier! at FriendsReunion.Partners.GetAttendees(String placeId) in C:\Apress\ Code Download\09\FriendsReunion\Services\Partners.asmx.vb:line 91 This is due to the way SOAP faults are serialized and deserialized by .NET, and unfortunately, there s little you can do to resolve the issue. 9. You might not be able to stop the errors from being formatted in this manner when they re returned, but you can write a bit of code to retrieve solely the original message using string manipulation, as long as you always return a single-line error message from your web service. To do this, amend the catch block as follows: Catch se As SoapException lblError.Text = String.Format( _ "<h2>An error happened connecting to Friends Reunion service.</h2>" & _ "<h3>Service location: {0}</h3>" & _ "Error: <br/>{1}", se.Actor, _ se.Message.Substring(45, se.Message.IndexOf(vbLf) - 45)) lblError.Visible = True End Try 10. Now run the application again. You will be presented with a different, more userfriendly message, as shown in Figure 9-12.

vb.net data matrix reader

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Then cost = (probe passes + 1) * round(1,269/6.588) + round(255/6.588) = 3 * 193 + 39 = 579 + 39 = 618 -- as required (with a little rounding error) You ll notice that the optimizer seems to have allowed for dumping and rereading the probe partitions it used probe passes + 1 in the calculation but only caters to the cost of the hash table once. I don t know why. (You ll also notice that I could have made a better choice about where to do my rounding to make the numbers come out exactly right but there s always a little room for error in the rounding and print formatting routines that go into the 10053 trace.) Just to confirm that this hypothesis is correct, and not just a one-off lucky chance, we can run the calculations for 8i and 10g. With a hash_multiblock_io_count of 9, the optimizer will use the value 7.12 in the calculations. Bear in mind that we are looking for a total cost of 1,081 (in 10g) which means that when we factor out the cost of the tablescans, the hash join component will be 1,081 510 = 570. (The result is the same for 8i once we allow for the slightly reduced tablescan cost: 570 = 1.079 508.) Sure enough: (probe passes + 1) * round(1,269/7.12) + round(255 / 7.12) = 3 * 178 + 36 = 570 -- as required If you want to test the arithmetic further, you can rerun hash_one.sql with different values for the hash_multiblock_io_count and watch the hash join cost change. Note that the parameter became hidden in 9i, so the syntax for setting the parameter will change: alter session set "_hash_multiblock_io_count" = 4; alter session set hash_multiblock_io_count = 4; -- 9i syntax -- 8i syntax

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vb.net data matrix reader

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The crosstab cell at the intersection of a row bucket value and a column bucket value (called the detail crosstab cell) can be declared using a <crosstabCell> tag in which both the rowTotalGroup and columnTotalGroup attributes are empty. For the detail crosstab cell, both the width and the height attributes are mandatory, specifying the size of the cell in pixels.

Type very carefully when testing this feature with 9i; the 8i syntax does not produce an error in 9i, but the value is silently ignored.

Figure 9-12. By using string-manipulation, you can present a user-friendly error message related to a web service problem.

Let s look a little more closely at the most degenerate case where the available hash_area_size is much too small (or the statistics were sufficiently inaccurate that the optimizer made a very bad choice of the number of partitions needed for the hash table).

vb.net data matrix reader

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How It Works Within your code, you can throw exceptions, just as in any other code. These could technically be any exception supported by the CLR, such as an ArgumentException, an ApplicationException, and so on. However, rather than use these, you can throw a special type of exception: the SoapException. This provides a structure within which you can store more appropriate and detailed information than with more generic exceptions. Such information includes the URL at which the error occurred and details of what caused the error. In this example, you used this information to show the error message. You determined the information for the error message from two values: SoapException.ClientFaultCode specifies that the error was due to the values that were passed in to the function. Context.Request.Url.AbsoluteUri returns the location at which the code is running. When you passed these values to the constructor of the SoapException, you used one of the six overloaded methods.

vb.net data matrix reader

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