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On the surface, this doesn t seem too complicated but look at the code that deals with the child s EditLevelAdded property in the UnDeleteChild() method. In the InsertItem() method I discussed earlier, the assumption is that any child being added to the collection is a new object, and therefore InsertItem() sets its edit level value to the collection s current value. However, the InsertItem() method is run when this preexisting object is reinserted into the collection, altering its edit level. That would leave the child object with an incorrect edit level value. The problem is that, in this case, the child object isn t a new object; it is a preexisting object that is just being restored to the collection. To solve this, the object s edit level value is stored in a temporary field, the child object is re-added to the collection, and then the child object s edit level value is reset to the original value, effectively leaving it unchanged.

The second procedure constructs a unique SQL statement for each row to be inserted: ops$tkyte%ORA11GR2> create or replace procedure proc2 2 as 3 begin 4 for i in 1 .. 10000 5 loop 6 execute immediate 7 'insert into t values ( '||i||')'; 8 end loop; 9 end; 10 / Procedure created. Now, the only difference between the two is that one uses a bind variable and the other does not. Both are using dynamic SQL and the logic is identical. The only difference is the use of a bind variable in the first. We are ready to evaluate the two approaches and we ll use runstats, a simple tool I ve developed, to compare the two in detail:

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Note For details on runstats and other utilities, please see the appendix on Tools & Scripts used in this book.

ops$tkyte%ORA11GR2> exec runstats_pkg.rs_start PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec proc1 PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec runstats_pkg.rs_middle PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec proc2 PL/SQL procedure successfully completed. ops$tkyte%ORA11GR2> exec runstats_pkg.rs_stop(10000) Run1 ran in 65 cpu hsecs Run2 ran in 1224 cpu hsecs run 1 ran in 5.31% of the time

Everything has so far laid the groundwork for the n-level undo functionality All the pieces now exist to make it possible to implement the CopyState(), UndoChanges(), and AcceptChanges() methods and then the BeginEdit(), CancelEdit() and ApplyEdit() methods The CopyState() method needs to take a snapshot of the collection s current state It is invoked when the BeginEdit() method is called on the root object (either the collection itself or the collection s parent object) At that time, the root object takes a snapshot of its own state and calls CopyState() on any child objects or collections so they can take snapshots of their states as well: Private Sub CopyState(ByVal parentEditLevel As Integer, _ ByVal parentBindingEdit As Boolean) Implements CoreIUndoableObjectCopyState If Not parentBindingEdit Then CopyState(parentEditLevel) End If End Sub Private Sub CopyState(ByVal parentEditLevel As Integer) If MeEditLevel + 1 > parentEditLevel Then Throw New CoreUndoException(String.

Note You may not observe exactly the same values for cpu, nor in fact for any metric, as I report here.

Differences will be caused by different Oracle versions, different operating systems, or different hardware platforms. The idea will be the same, but the exact numbers will undoubtedly be marginally different.

Format( _ MyResourcesEditLevelMismatchException, "CopyState")) End If ' we are going a level deeper in editing _editLevel += 1 ' cascade the call to all child objects For Each child As C In Me childCopyState(_editLevel, False) Next ' cascade the call to all deleted child objects For Each child As C In DeletedList childCopyState(_editLevel, False) Next End Sub There are technically two CopyState() methods one for the CslaCoreIUndoableObject interface and the other a Private implementation for use within BusinessListBase The interface implementation merely delegates to the Private implementation As CopyState() takes a snapshot of the collection s state, it increases the edit level by one Remember that UndoableBase relies on the Stack object to track the edit level, but this code just uses a simple numeric counter.

Now, the preceding result clearly shows that based on CPU time, it took significantly longer and significantly more resources to insert 10,000 rows without bind variables than it did with them. In fact, it

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