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END CATCH an error will be returned via the SELECT statement in the CATCH block. One of the limitations that you will have to deal with is when you are doing several operations in the same batch. For example, consider our tv$insert procedure. Instead of inserting a single row, let s say we are going to insert two rows: ... BEGIN TRANSACTION INSERT TV (TVid, location, diagonalWidth) VALUES(@TVid, @location, @diagonalWidth) --second insert: INSERT TV (TVid, location, diagonalWidth) VALUES(@TVid, @location, @diagonalWidth / 2 ) COMMIT TRANSACTION ... How would we tell the two inserts apart if one of them had an error It would not be possible, as either statement could break the rules of the TV table s CHECK constraint. In this case, one possible way to deal with this would be a custom error message value. So you might do something like this: ALTER PROCEDURE entertainment.tv$insert ( @TVid int, @location varchar(30), @diagonalWidth int ) AS SET NOCOUNT ON DECLARE @errorMessage varchar(2000) BEGIN TRY BEGIN TRANSACTION SET @errorMessage = 'Error inserting TV with diagonalWidth / 1' INSERT TV (TVid, location, diagonalWidth) VALUES(@TVid, @location, @diagonalWidth) --second insert: SET @errorMessage = 'Error inserting TV with diagonalWidth / 2' INSERT TV (TVid, location, diagonalWidth) VALUES(@TVid, @location, @diagonalWidth / 2 ) COMMIT TRANSACTION END TRY

Figure 15-6. Adding the reference to the Word Primary Interop object If the Microsoft.Office.Interop.Word list item isn t showing, in all probability you didn t follow the example in 14 and therefore need, at the very least, to follow the steps presented in that example to download and install the Word Interop Assembly and register it in the GAC. 5. Click OK to close the dialog and add the reference.

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BEGIN CATCH ROLLBACK TRANSACTION INSERT dbo.error_log VALUES('TV',suser_sname(), ERROR_NUMBER(),ERROR_SEVERITY(), ERROR_STATE(), ERROR_MESSAGE()) RAISERROR (@errorMessage,16,1) END CATCH GO Now we can execute it: exec entertainment.tv$insert @TVid = 10, @location = 'Bed Room', @diagonalWidth = 30 This returns Msg 50000, Level 16, State 1, Procedure tv$insert, Line 28 Error inserting TV with diagonalWidth / 1 And then again with a number big enough to satisfy it, but not when it is divided by two: exec entertainment.tv$insert @TVid = 11, @location = 'Bed Room', @diagonalWidth = 60 which returns Msg 50000, Level 16, State 1, Procedure tv$insert, Line 28 Error inserting TV with diagonalWidth / 2 The key here (other than we really like TV and don t like small ones) is to make sure to give your CATCH block enough information to raise a useful error, or the error messages you may produce using the new error handling will not be all that much better than what we had before. Error handling in SQL Server 2005 is vastly improved over previous versions, but it is going to take a big mindshift to get us there. Once you start blocking errors from the client that has expected errors in the past, you may break code by trying to fix it. So careful study and some re-engineering will likely be in order to really start using the new error handling capabilities.

6. At the very top of the code where the using/imports statements are listed, replace the statements to reflect those in Listing 15-3 (C#) or Listing 15-4 (VB.NET). Listing 15-3. Using Statements (C#) using System; using System.Reflection; using Microsoft.Office.Interop.Word; Listing 15-4. Imports Statements (VB.NET) Imports System Imports System.Reflection Imports Microsoft.Office.Interop.Word 7. Next you need to add some private member level variables. Add the code from Listing 15-5 (C#) or Listing 15-6 (VB.NET) to the area after the class declaration but before the constructor code. Listing 15-5. Private-Member Variables to Add (C#) private readonly Application _wordSpellChecker = new Application(); private int _maxSuggestionsCount = 5; Listing 15-6. Private-Member Variables to Add (VB.NET) Private _wordSpellChecker As Application = New Application() Private _maxSuggestionsCount As Integer = 5 8. Add the code from Listing 15-7 (for C#) or Listing 15-8 (for VB.NET) to the SpellcheckEngine constructor. Listing 15-7. Constructor Code (C#) public Spellcheck() { object optional = Missing.Value; _wordSpellChecker.Application.Documents.Add(ref optional, ref optional, ref optional, ref optional); } Listing 15-8. Constructor Code (VB.NET) Public Sub New() Dim optionalValue As Object = Missing.Value _wordSpellChecker.Application.Documents.Add(optionalValue, optionalValue, optionalValue, optionalValue) End Sub

The new TRY and CATCH blocks make safe coding easier for handling errors, including stopping error messages from ever making it to the client.

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