Trancount Trancount Trancount Trancount Trancount = = = = = 0 1 2 1 0 in VS .NET

Creation Data Matrix 2d barcode in VS .NET Trancount Trancount Trancount Trancount Trancount = = = = = 0 1 2 1 0

Trancount Trancount Trancount Trancount Trancount = = = = = 0 1 2 1 0
DataMatrix Reader In .NET Framework
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET applications.
Encode Data Matrix 2d Barcode In Visual Studio .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
An interesting inconsistency to observe is in the behavior of the Rollback Transaction statement. No matter how many transaction levels deep execution
Scanning Data Matrix ECC200 In Visual Studio .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET framework applications.
Barcode Maker In .NET Framework
Using Barcode generation for .NET framework Control to generate, create bar code image in VS .NET applications.
SQL Server 2000 Stored Procedure & XML Programming
Reading Bar Code In VS .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Create DataMatrix In Visual C#
Using Barcode generator for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications.
extends, the Rollback Transaction statement will cancel all changes caused by all transactions (and bring the @@trancount value down to zero). In fact, if you execute an additional Rollback Transaction statement after the first one, SQL Server will report an error.
Drawing ECC200 In VS .NET
Using Barcode maker for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
Create DataMatrix In VB.NET
Using Barcode maker for VS .NET Control to generate, create ECC200 image in .NET framework applications.
print 'Trancount = ' + Convert(varchar(4), @@trancount) BEGIN TRANSACTION print 'Trancount = ' + Convert(varchar(4), @@trancount) BEGIN TRANSACTION print 'Trancount = ' + Convert(varchar(4), @@trancount) ROLLBACK TRANSACTION print 'Trancount = ' + Convert(varchar(4), @@trancount) ROLLBACK TRANSACTION print 'Trancount = ' + Convert(varchar(4), @@trancount)
Draw 1D Barcode In .NET
Using Barcode creation for .NET Control to generate, create Linear image in .NET framework applications.
Create Code 39 Full ASCII In .NET Framework
Using Barcode generation for .NET framework Control to generate, create Code-39 image in Visual Studio .NET applications.
The following is the result of this example:
Encoding Barcode In .NET Framework
Using Barcode generator for VS .NET Control to generate, create bar code image in VS .NET applications.
Bookland EAN Creator In Visual Studio .NET
Using Barcode creator for .NET Control to generate, create ISBN image in Visual Studio .NET applications.
Trancount = 0 Trancount = 1 Trancount = 2 Trancount = 0 Server: Msg 3903, Level 16, State 1, Line 8 The ROLLBACK TRANSACTION request has no corresponding BEGIN TRANSACTION. Trancount = 0
ECC200 Creator In None
Using Barcode drawer for Online Control to generate, create DataMatrix image in Online applications.
Encoding UCC-128 In None
Using Barcode drawer for Software Control to generate, create GTIN - 128 image in Software applications.
I have to admit that I had many problems with this issue at one time. Be careful.
Make Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create barcode image in iPhone applications.
Recognizing Barcode In Java
Using Barcode Control SDK for BIRT Control to generate, create, read, scan barcode image in Eclipse BIRT applications.
To prevent this error, you need to test for the value of the @@trancount variable before you execute the Rollback Transaction statement. A simple way to test for this value works something like this:
Scanning Bar Code In VS .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET applications.
Scanning UPC A In Visual Basic .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
if @@trancount > 0 Rollback Transaction
Data Matrix Creator In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
Data Matrix Printer In None
Using Barcode creation for Office Excel Control to generate, create Data Matrix image in Excel applications.
You will find a much better solution in 7.
Named Transactions
Transaction statements can be named. The name must be a valid SQL Server identifier (that is, no more than 128 characters), but SQL Server will read only the first 32 characters:
C h a p t e r 6 : C o m p o s i t e Tr a n s a c t - S Q L C o n s t r u c t s : B a t c h e s , S c r i p t s , a n d Tr a n s a c t i o n s
Begin Tran[saction][transaction_name|@transaction_name_variable] Commit Tran[saction][transaction_name|@transaction_name_variable] Rollback [Tran[saction][transaction_name|@transaction_name_variable]]
I know that this sounds like a perfect tool for resolving some issues with nested transactions. Unfortunately, in nested transactions, only the names of outer transactions are recorded by SQL Server. If you try to roll back any of the inner transactions, errors occur. The following listing is an academic demonstration of such an attempt:
BEGIN TRANSACTION t1 BEGIN TRANSACTION t2 ROLLBACK TRANSACTION t2 ROLLBACK TRANSACTION t1
SQL Server will return an error:
Server: Msg 6401, Level 16, State 1, Line 3 Cannot roll back t2. No transaction or savepoint of that name was found.
You can see that you need to know the name of the outer transaction that has called all other stored procedures/transactions. This is not a practical requirement, especially when your stored procedure will be called from more than one stored procedure. Therefore, I recommend that you do not use transaction names.
Savepoints
SQL Server contains a mechanism for rolling back only part of a transaction. This statement may seem to contradict the basic idea of a SQL Server transaction as I have explained it, but it can be justified in some cases. Microsoft recommends savepoints to be used if it is more expensive to check will change be valid in advance (for example, because of a slow connection) and operation has high probability of success. For example, assume that you are trying to reserve a set of plane tickets (or to get a set of some other resources) using different companies (distributed database system). Each leg of a journey has to be booked separately. If the reservation fails, you will roll back just that leg of the journey, not all reservations that you already successfully made. Only in the case that it is impossible to find any alternative for the remaining part of the journey will you roll back the complete transaction.
SQL Server 2000 Stored Procedure & XML Programming
To mark a savepoint in a transaction, use the following statement:
Save Tran[saction]{savepoint_name|@savepoint_variable}
The savepoint s name is also a SQL Server identifier, but SQL Server reads only the first 32 characters. To roll back part of the transaction, you must use the savepoint name or variable:
Rollback Tran[saction]{savepoint_name|@savepoint_variable}
Copyright © OnBarcode.com . All rights reserved.