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CHAPTER 10 s WEB FORMS UI
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This example was a simple one, showing how you can manipulate CSS classes on the underlying controls by using the various methods available to Atlas client-side controls. In addition, you saw how event delegates can be added to controls to allow for complex functionality to be performed upon an event. As you work through this chapter, I will expand on this example to show you how to achieve more sophisticated functionality.
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3. The UI calls the object s Save() method. 4. The Save() method invokes the data portal just like it does to do an insert or update (as discussed earlier). 5. The data portal ultimately calls the object s DataPortal_DeleteSelf() method. 6. Typically, the DataPortal.DeleteSelf() method calls the object s DataPortal_Delete() method, which contains the code needed to delete the object s data (and any related child data, and so on). 7. From the business object s perspective, one method is called, as follows: DataPortal_DeleteSelf() Figure 7-9 illustrates the process of deferred deletion. Note that this is a simplified diagram, since the complete process is analogous to adding or updating a root object as discussed earlier.
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During the process of your application, you will want to be able to update the World matrices of your models. This is why your main program needs to keep track of the ID number of a model you store in the octree: you need to be able to change the World matrix of the model with that ID. To extend your octree so it allows changing World matrices, two more methods are needed in the OcTreeNode class. This is the first one, which is public, so it can be called by the main program: public void UpdateModelWorldMatrix(int modelID, Matrix newWorldMatrix) { DrawableModel deletedModel = RemoveDrawableModel(modelID); deletedModel.WorldMatrix = newWorldMatrix; AddDrawableModel(deletedModel); }
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The header region of the page is the title area across the top. It contains a single Label control named PageTitle. This control displays the title of the current content page, based on the Title property set for that page. The following code is included in MasterPage.master to load this value: protected void Page_Load(object sender, EventArgs e) { PageTitle.Text = Page.Title; } As each content page loads, not only does the Load event for the content page run, but so does the Load event for the master page. This means that code can be placed in the master page to run when any content page is loaded in this case, to set the title at the top of the page.
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Your pivot table has a list of sales totals for each product, and instead of numbers, you d like to show traffic lights, to indicate the high, low, and middle results. This can create a simple report you can share with employees, without disclosing all the numbers. This example is based on the Products.xlsx workbook.
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#4: MethodPtr 4 of Class 2 #5: MethodPtr 1 of Class 2 #6: MethodPtr 2 of Class 2 #7: MethodPtr 3 of Class 2 #8: MethodPtr 1 of Class 3 #9: MethodPtr 2 of Class 3
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In the Users table, Username and Password are both varchar(20) columns, as is the Role column in the Roles table. Only the Password column allows null values. All other values are required. Of course, a password should be required as well, but for this simple example, it is left as optional. Finally, there s a Login stored procedure: CREATE PROCEDURE Login ( @user varchar(20), @pw varchar(20) ) AS SELECT Username FROM Users WHERE Username=@user AND Password=@pw; SELECT R.Role FROM Users AS U INNER JOIN Roles AS R ON R.UserName = U.UserName WHERE U.Username = @user and U.Password = @pw RETURN This procedure is called by PTIdentity to authenticate the user and retrieve the user s list of roles. As you ll see in 8, PTIdentity determines whether the user s credentials are valid or not by finding out whether any data is returned from this stored procedure. If no data is returned, then the user s credentials are assumed to be invalid and the user is not authenticated. On the other hand, if the stored procedure does return data, then PTIdentity stores that data, especially the list of roles to which the user belongs. This list of security roles (not to be confused with the project roles from the PTracker database) is then used for authorization throughout the application. The CanReadProperty() and CanWriteProperty() methods on each business object rely on this data.
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After both objects have been removed from the collection, they re marked for deletion and moved to the DeletedList collection. This way they appear to be gone from the collection, but the collection still has access to them if needed. After the CancelEdit() call, the collection s edit level goes back to 0. Since child A came from the database, it was added at edit level 0, so it sticks around. Child B, on the other hand, was added at edit level 1, so it goes away. Also, child A has its state reset as part of the CancelEdit() call (remember that CancelEdit() causes a cascade effect, so each child object restores its snapshot values). The result is that because of the undo operation, child A is no longer marked for deletion. Another common scenario follows the same process, but with a call to ApplyEdit() at the end, as shown in Figure 3-5.
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Reverse Pro*C
Silverlight 4 further introduces networking enhancements supporting easy and scalable implementation of line-of-business applications: Allowing Silverlight applications to be trusted out-of-browser eliminates the need of cross-domain access policy files (ClientAccess.xml or CrossDomainAccess.xml) and provides the capability to create group policies to manage the trusted applications. ClientHttp networking stack provides the NetworkCredential class, which now enables implementation of network authentication in web requests. Introduction of Multicast UDP for one-to-many and many-to-many communication over the network improves application performance and stability by utilizing networking resources more efficiently.
You ll notice that the web service doesn t expose web methods in a typical manner. In this case, the web service is derived from DataService, and the methods are attributed using [DataObjectMethod]. These are used by the ObjectDataSource control to expose methods that are treated as Select, Insert, Update, or Delete. For more information about these, take a look at MSDN (in particular at http://msdn2. microsoft.com/en-us/library/57hkzhy5.aspx). Also note that for the sake of simplicity, this example uses an in-memory data source, which is a static array of SampleRow objects. This makes it a stateful web service, which typically isn t good practice! Now let s look at the data source control and how it is used to bind the HTML list to this data so that you can get results like those you saw in Figure 8-3. Let s start by looking at the HTML for the page: <div id="dataContents"> </div> <div style="visibility:hidden;display:none"> <div id="masterTemplate"> <div id="masterItemTemplate"> Row <span id="masterIndex"></span>   <b><span id="masterName"></span></b><br /> <span id="masterDescription"></span><br /> </div><br/> </div> <div id="masterNoDataTemplate">No data</div> </div> This defines two <div> elements. The first is dataContents, which will contain the rendered results. The second is masterTemplate, which defines the template for how the data will appear. Both of these elements will have Atlas client controls mapped to them. Let s look at the Atlas Script code that maps to these elements and binds to the data source: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <dataSource id="dataSource" serviceURL="SampleDataService.asmx" propertyChanged="onChange"/> <listView id="masterRepeater" targetElement="dataContents" itemTemplateParentElementId="masterTemplate" propertyChanged="onChange"> <bindings> <binding dataContext="dataSource" dataPath="data" property="data"/> </bindings>
USERNAME SID RBS SLOT SEQ LMODE REQUEST --------- ---------- ---------- ---------- ---------- ---------- ---------OPS$TKYTE 7 2 26 8297 0 6 OPS$TKYTE 703 2 26 8297 6 0 OPS$TKYTE 7 7 13 8215 6 0 ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> select XIDUSN, XIDSLOT, XIDSQN 2 from v$transaction; XIDUSN XIDSLOT XIDSQN ---------- ---------- ---------2 26 8297 7 13 8215 What we see here is that a new transaction has begun, with a transaction ID of (7,13,8215). Our new session, SID=7, has two rows in V$LOCK this time. One row represents the locks that it owns (where LMODE=6). It also has a row that shows a REQUEST with a value of 6. This is a request for an exclusive lock. The interesting thing to note here is that the RBS/SLOT/SEQ values of this request row are the transaction ID of the holder of the lock. The transaction with SID=703 is blocking the transaction with SID=7. We can see this more explicitly simply by doing a self-join of V$LOCK: ops$tkyte%ORA11GR2> select 2 (select username from v$session where sid=a.sid) blocker, 3 a.sid, 4 " is blocking ", 5 (select username from v$session where sid=b.sid) blockee, 6 b.sid 7 from v$lock a, v$lock b 8 where a.block = 1 9 and b.request > 0 10 and a.id1 = b.id1 11 and a.id2 = b.id2; BLOCKER SID "ISBLOCKING" BLOCKEE SID --------- ---------- ------------- --------- ---------OPS$TKYTE 703 is blocking OPS$TKYTE 7 Now, if we commit our original transaction, SID=703, and rerun our lock query, we find that the request row has gone: ops$tkyte%ORA11GR2> select username, 2 v$lock.sid, 3 trunc(id1/power(2,16)) rbs, 4 bitand(id1,to_number("ffff","xxxx"))+0 slot, 5 id2 seq, 6 lmode, 7 request 8 from v$lock, v$session 9 where v$lock.type = "TX" 10 and v$lock.sid = v$session.sid 11 and v$session.username = USER;
Local Constants
C HA PTER 3 OBJEC T-ORIE NTED APPLIC ATION DES IGN
CHAPTER 5: Starting with a Game Design Document: A Methodology for Success
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