Visual Basic 5 Database Developer's Guide by Mark Swank PDF

By Mark Swank

ISBN-10: 1575212765

ISBN-13: 9781575212760

Database entry is a number one strategic use of internet expertise. This Database Developer's consultant teaches the reader the way to layout, boost, and installation safe client/server databases which are available via consumers on web and Intranet sites utilizing the most recent model of visible simple and different new key applied sciences, resembling ActiveX and Server aspect Scripting. The accompanying CD contains the author's resource code and assets equivalent to web site, 3rd get together ActiveX keep an eye on samples, DBGateway, and others.

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The Interface Dejinition That Will Ee Compiled to a DLL using Systemj namespace General { public interface IMyRemoteObject { void setValue (int newval)j int getValueO j } } The client that is shown in Listing 3-2 provides the means for opening a connection to the server and tries to set and retrieve the instance values of the server-side remote object. NET project for this example. Listing 3-2. MainO: Reference to rem. ReadLine(); } } } The sample client will read and output the server's original value, change it to 42, and then read and output it again.

WriteLine ("ServerStartup. Singleton); II the server will keep running until keypress. ReadLine(); } When the client is started, the output wiU show a behavior consistent with the "normal" object -oriented way of thinking; the value that is returned is the same value you set two lines before (see Figure 3-3). Figure 3-3. Client's output for a Singleton object The same is true for the server, as Figure 3-4 shows. 34 Remoting in Action Figure 3-4. Server's output for a Singleton object An interesting thing happens when a second client is started afterwards.

Validate() and Customer . getAge() are executed on the server. The returned ValidationResult is serialized and transferred to the client. Figure 2-5. NET Remoting. You now know the difference between MarshalByRefObjects, which allow you to cali server-side methods, and ByValue objects, which have to be serializable and will be pas sed as copies. You read about the general structure of a remoting application and implemented a sample application that relied on shared interfaces. NET Remoting in yom real-world applications.

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Visual Basic 5 Database Developer's Guide by Mark Swank

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