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-- of last ChargeLog record associated with OrderItem. @intOrderItemId int As set nocount on Declare @intErrorCode int Select @intErrorCode = @@Error If @intErrorCode = 0 Begin Transaction -- Set CompletionDate of OrderItem to date -- of last ChargeLog record associated with OrderItem. If @intErrorCode = 0 Begin update OrderItem Set CompletionDate = (Select Max(ChargeDate) from ChargeLog where ItemId = @intOrderItemId) Where ItemId = @intOrderItemId Select @intErrorCode = @@Error End If @intErrorCode = 0 and @@trancount > 0 Commit Transaction Else Rollback Transaction Return @intErrorCode

In the case of nested transactions, no Commit statements except the outer one will save changes to the database. Only after the last transaction is committed will all changes to the database become permanent. Up to that point, it is still possible to roll back all changes. The interesting question is how SQL Server knows which transaction is the last one. It keeps the number of opened transactions

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in the @@trancount global variable for each user connection. When SQL Server encounters a Begin Transaction statement, it increments the value of the @@trancount, and when SQL Server encounters a Commit Transaction statement, it decrements the value of the @@trancount. Therefore, the only effect of a nested (internal) Commit Transaction statement is a change to the @@trancount value. Only the outer Commit Transaction statement (when @@trancount = 1) stores changes in data tables rather than in the transaction log. Figure 6-3 shows an academic example that does not contain any real processing, but that demonstrates the effect of nested stored procedures on the @@trancount global variable. An interesting inconsistency to observe is in the behavior of the Rollback Transaction statement. No matter how many transaction levels deep execution extends, the Rollback Transaction statement will cancel all changes caused by all transactions (and bring the @@trancount value down to zero).

be longer than this arbitrary figure. The trouble is that you cannot define local variables of the text data type (and varchar is limited to only 8000 characters). Fortunately, sp_xml_preparedocument and OpenXML() can handle text parameters. Instead of using a local variable of the text data type, you can use an input parameter of a custom stored procedure as a parameter for sp_xml_preparedocument. The following stored procedure illustrates this method:

Figure 6-3.

In fact, if you execute an additional Rollback Transaction statement after the first one, SQL Server will report an error (see Figure 6-4).

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 could work something like this:

Figure 6-4.

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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:

Alter Procedure prTestXML -- Extract Inventory info. from long XML document. -- Demonstration of usage of text input parameters -- to parse long XML document. @chvXMLDoc text As set nocount on Declare @intErrorCode int, @intTransactionCountOnEntry int @intDoc int Select @intErrorCode = @@Error

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. Figure 6-5 provides an academic demonstration of such an attempt.

Figure 6-5.

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TIP: From Figure 6-5, 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.

SQL Server contains a mechanism for canceling 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 (for example, in the case of bad connections or if an operation has a low probability of success). The mechanism is known as a savepoint. To mark a savepoint in a transaction, use the following statement:

Save Tran[saction]{savepoint_name|@savepoint_variable}

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