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The first step to building a web service is to publish some standalone services that can be used by interested parties. But there s a whole lot more to building an SOA than that. You ll need to move to level 2 (to borrow terminology used in the gaming world). The next level of web services involves building aggregate services. This is where two or more services are combined to provide an even more coarsegrained functionality. Of course, there is the simpler case where the service you expose simply needs to leverage a service not built by you. Either way, you re the client in this scenario, so let s see what s involved in invoking web services from EJB 3. First we ll examine a standalone Java client for testing the PlaceBid web service that we built in an earlier section; then we ll explore how you can access a web service from an EJB such as a session bean or MDB.

connection database connection 65 Connection Manager 224 connection pooling 315 Connection Properties 29, 68 connection string 74 Content Manager role 264,

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Java has a built-in persistence mechanism: Serialization provides the ability to write a snapshot of a network of objects (the state of the application) to a byte stream, which may then be persisted to a file or database. Serialization is also used by Java s Remote Method Invocation (RMI) to achieve pass-by value semantics for complex objects. Another use of serialization is to replicate application state across nodes in a cluster of machines. Why not use serialization for the persistence layer Unfortunately, a serialized network of interconnected objects can only be accessed as a whole; it s impossible to retrieve any data from the stream without deserializing the entire stream. Thus, the resulting byte stream must be considered unsuitable for arbitrary search or aggregation of large datasets. It isn t even possible to access or update a single object or subset of objects independently. Loading and overwriting an entire object network in each transaction is no option for systems designed to support high concurrency. Given current technology, serialization is inadequate as a persistence mechanism for high concurrency web and enterprise applications. It has a particular niche as a suitable persistence mechanism for desktop applications.

How does this style relate to covering indexes An overly-simplistic definition of a covering index would be nonclustered index defined over the set of columns used by one table in a projection These indexes make for nicely optimized query plans, and sometimes even help with concurrency issues in SELECTs But if we re always doing SELECT * FROM, forget those covering indexes The index used most commonly is the clustered index on the base table You shouldn t define a covering index for every projection just because you can Every index consumes space and affects the performance of inserts, updates, and deletes; therefore, there s a tradeoff In fact, I ve also heard it said that if you need many, many covering indexes, perhaps your database isn t as well normalized as it could be, but I m not really sure I buy this argument..

this.Close( );

This looks like variants in VB, but the new syntax and variants aren t the same. Implicitly typed local variables are strongly typed. For example, the following VB.NET code isn t valid and will return an error stating that conversion from type String to type Integer isn t valid:

[Personalizable] public Employee Employee { get { return _employee; } set { SetPersonalizationDirty() ; employee = value; } }

'' draw the entity Set objEnt = ThisDrawing.ModelSpace.AddCylinder(dblCenter, dblRadius, dblHeight) objEnt.Update ThisDrawing.SendCommand "_shade" & vbCr End Sub

We ll query the Product index for all occurrences of the term salesman in the description field in listing 12.1.

Notice that the parentheses were left off the end of DealTheCards(). This omission is critical. If the parentheses were there, the code would have called DealTheCards(), returning a value to myFuncPtr. You may also have noticed that the & operator wasn t used. When you refer to a function without using the parentheses at the end, the compiler knows you are referring to the address of the function. Now that you have the function s address in the function pointer, there s only one thing left to do call the function. Here s how it s done:

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