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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>

To gently get started with URLLoader and its applicability, let s re-implement the HTTPService example using URLLoader Here is the new code, done up as an MXML application:.

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Once the type is completed and deployed, you can use it just like any other SQL Server data type to define columns, declare variables, etc It is important to note, however, that this feature is not intended as a mechanism to turn SQL Server into an object-oriented database This feature is meant for small and simple types only If you attempt to use more complex types, you will soon run into the 8KB column size limit or various indexing restrictions Therefore, complex business objects such as Customer, Product, Order, etc are poor candidates for UDTs On the other hand, a good example of where a UDT might be useful is if you have tables that use a custom date structure With a UDT, you can encapsulate that custom date structure and its behaviors into a custom type..

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;

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