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You can determine that the program is leaking by noticing the absence of the "Term B" and "Term A" statements in the immediate window. This is one of the reasons that the designers of .NET chose to go with garbage collection instead of reference counting as the means of managing memory. Recall that reference counting is a means of keeping track of how many objects are referencing an item. Each time an object gains a reference, it increments the reference count. When an object is finished with an item, it decrements the reference count of that item. When the reference count of an item reaches zero, it is removed from memory as part of the decrementing call. The negative impact of garbage collection is that it introduces nondeterministic finalization. All that means is that you don t know exactly when, or even if, the Finalize method will execute. To see that .NET really has fixed the circular reference problem, consider listing 2.5.

Generally, all resources used by a transaction, such as locks, are released when the transaction commits (except for nested transactions, which are discussed in the Creating Nested Transactions section later in this chapter). Note that the way in which locks are managed during a transaction also depends on the isolation level. For example, when using the READCOMMITTED isolation level, shared locks for SELECT statements are released during a multi-statement transaction as soon as the SELECT completes, they are not held until the end of the transaction. See the section Isolation Levels later in this chapter for more details. A transaction commits successfully if each of its statements is successful. For example, here is the T-SQL to run a single statement explicit transaction, named

update_marital_status, that updates the MaritalStatus column value to M in the Employee table for a particular EmployeeID:

1

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USE AdventureWorks; BEGIN TRAN update_marital_status; UPDATE HumanResources.Employee SET MaritalStatus= M WHERE EmployeeID=8; COMMIT TRAN update_marital_status;

The transaction name update_marital_status is ignored by SQL Server; it serves simply as an aid to the programmer for identifying which transaction is being committed. This is useful in the case of nesting transactions as seen in the next section. In this previous example, since only one data modification statement makes up the entire transaction, the same can be accomplished without an explicit transaction, but instead using the SQL Server default autocommit mode as follows:

Listing 2.5 Circular reference in Visual Basic .NET (VB.NET)

USE AdventureWorks; UPDATE HumanResources.Employee SET MaritalStatus= M WHERE EmployeeID=8;

In autocommit mode, the UPDATE statement begins a transaction which is committed as soon as the update completes. When a transaction includes multiple modification statements that must be executed as a unit or not at all, an explicit transaction or implicit mode is necessary instead of using autocommit mode (see section Implicit Mode later in this chapter). For an example of creating an explicit transaction, let s expand on the previous update transaction by adding another update that changes a woman s title to correspond to her marital status that should be part of the unit of work. Here is the code to do this:

USE AdventureWorks; BEGIN TRAN update_marital_status; UPDATE HumanResources.Employee SET MaritalStatus= M WHERE EmployeeID=8; UPDATE Person.Contact SET title = Mrs. FROM HumanResources.Employee e JOIN Person.Contact p ON e.ContactID = p.ContactID WHERE e.EmployeeID = 8; COMMIT TRAN update_marital_status;

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Public Class Form1 Inherits System.Windows.Forms.Form . . . Private Sub ButtonTestCircular_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonTestCircular.Click MakeCircular() GC.Collect() End Sub Private Function MakeCircular() Dim oA As New ClassA() Dim oB As New ClassB() oA.oClassB = oB oB.oClassA = oA End Function End Class Public Class ClassA Public oClassB As ClassB Public Sub New() System.Diagnostics.Debug.WriteLine("New A") End Sub Protected Overrides Sub Finalize() MyBase.Finalize() System.Diagnostics.Debug.WriteLine("Finalize A") End Sub End Class Public Class ClassB Public oClassA As ClassA

Now if there is a failure during processing, the entire transaction rolls back so that the updated marital status is not updated without the title also being updated. Therefore, that these pieces of information will be consistent either as they were before the transaction started or as updated by the transaction.

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