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C HAPTE R 10 DA TA BINDIN G
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C HA PTER 4 WO RK ING WI T H M OD ELS
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Getting and Setting Jagged Array Values
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CHAPTER 6 MORE ABOUT CLASSES
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You can explicitly set the order of evaluation of the sub-expressions of an expression by using parentheses. Parenthesized sub-expressions Override the precedence and associativity rules Are evaluated in order from the innermost nested set to the outermost
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Listing 8-4. Simple Class to Compile with Dependency
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Programming with Sockets
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what is happening. The problem here is that you cannot rely on managed objects to remain in existence when called from the finalizer. On the other hand, it is safe to reference these objects from the destructor because when the destructor runs, the object and all its members are still fully intact. In this case, you should move the data connection close operation into the destructor, and be sure to call delete or use stack semantics to force the destructor call and the closure of the connection. The bottom line is that you can t ignore calling delete for classes that hold onto resources. If this seems disappointing, just remember that the managed environment may be very good at cleaning up memory, but it is not designed to provide the same automatic cleanup for other resources, which are best handled by matching every gcnew for a class with a destructor with a corresponding delete, or, better, using stack semantics.
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CHAPTER 10 s ORCHESTRATIONS
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The nice thing about this trick is that it shows many of the options for my CREATE TABLE statement. I just have to pick data types and such; Oracle will produce the verbose version for me. I can now customize this verbose version, perhaps changing the ENABLE STORAGE IN ROW to DISABLE STORAGE IN ROW, which would disable the storage of the LOB data in the row with the structured data, causing it to be stored in another segment. I use this trick myself all of the time to avoid having to decipher the huge wire diagrams. I also use this technique to learn what options are available to me on the CREATE TABLE statement under different circumstances. Now that you know how to see most of the options available to you on a given CREATE TABLE statement, which are the important ones you need to be aware of for heap tables In my opinion, there are three with ASSM and five with MSSM: FREELIST: MSSM only. Every table manages the blocks it has allocated in the heap on a FREELIST. A table may have more than one FREELIST. If you anticipate heavy insertion into a table by many concurrent users, configuring more than one FREELIST can have a major positive impact on performance (at the cost of possible additional storage). Refer to the previous discussion and example in the section FREELISTS for the sort of impact this setting can have on performance. PCTFREE: Both ASSM and MSSM. A measure of how full a block can be is made during the INSERT process. As shown earlier, this is used to control whether a row may be added to a block or not based on how full the block currently is. This option is also used to control row migrations caused by subsequent updates and needs to be set based on how you use the table. PCTUSED: MSSM only. A measure of how empty a block must become before it can be a candidate for insertion again. A block that has less than PCTUSED space used is a candidate for insertion of new rows. Again, like PCTFREE, you must consider how you will be using your table to set this option appropriately. INITRANS: Both ASSM and MSSM. The number of transaction slots initially allocated to a block. If set too low (defaults to and has a minimum of 2), this option can cause concurrency issues in a block that is accessed by many users. If a database block is nearly full and the transaction list cannot be dynamically expanded, sessions will queue up for this block, as each concurrent transaction needs a transaction slot. If you believe you will have many concurrent updates to the same blocks, consider increasing this value. COMPRESS/NOCOMPRESS: Both ASSM and MSSM. Enables or disables compression of table data during either direct path operations or during conventional path ( normal, if you will) operations such as INSERT. Prior to Oracle 9i Release 2, this option was not available. Starting with Oracle 9i Release 2 through Oracle 10g Release 2, the option was COMPRESS or NOCOMPRESS, to either use or not use table compression during direct path operations only. In those releases, only direct path operations such as CREATE TABLE AS SELECT, INSERT /*+ APPEND */, ALTER TABLE T MOVE, and SQL*Loader direct path loads could take advantage of compression. Starting with Oracle 11g Release 1 and above, the options are NOLOGGING, COMPRESS FOR OLTP, and COMPRESS BASIC. NOLOGGING disables any compression, COMPRESS FOR OLTP enables compression for all operations (direct or conventional path), and COMPRESS BASIC enables compression for direct path operations only.
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When using this approach, all state must be maintained in <Serializable()> objects.
The Web Services Description Language
One huge advantage of MSBuild is that it can use project files from Visual Studio as build scripts. A Visual Studio CSPROJ file contains a set of properties, many of which are Silverlight-specific. Let s briefly dissect one of these Visual Studio project files (chapter3 is shown here) to see the Silverlight-specific additions: <OutputType>Library</OutputType> <AppDesignerFolder>Properties</AppDesignerFolder> <RootNamespace>chapter3</RootNamespace> <AssemblyName>chapter3</AssemblyName> <TargetFrameworkIdentifier>Silverlight</TargetFrameworkIdentifier> <TargetFrameworkVersion>v4.0</TargetFrameworkVersion> <SilverlightVersion>$(TargetFrameworkVersion)</SilverlightVersion> <SilverlightApplication>true</SilverlightApplication> <SupportedCultures> </SupportedCultures> <XapOutputs>true</XapOutputs> <GenerateSilverlightManifest>true</GenerateSilverlightManifest> <XapFilename>chapter3.xap</XapFilename> <SilverlightManifestTemplate>Properties\AppManifest.xml</SilverlightManifestTemplate> <SilverlightAppEntry>chapter3.App</SilverlightAppEntry> <TestPageFileName>TestPage.html</TestPageFileName> <CreateTestPage>true</CreateTestPage> <ValidateXaml>true</ValidateXaml> You can see that this project file is configured for Silverlight applications, setting properties related to the XAP file and defining the class that inherits from the IntelliSense class and serves as the entry point to the application. This project file also contains the directive to include the extension for building Silverlight applications. This extension controls how XAML pages are processed and how the XAP file is created. The structure of a Silverlight application as generated by Visual Studio includes the entry point for the application (the App.xaml and App.xaml.cs files), an empty UserControl (ExampleBrowser), an empty application manifest, the AssemblyInfo source file, and of course the project file. Let s look at using MSBuild to build this application. On disk, these files are organized as shown here: chapter3\App.xaml chapter3\App.xaml.cs chapter3\chapter3.csproj chapter3\ExampleBrowserClass\ExampleBrowser.xaml chapter3\ExampleBrowserClass\ExampleBrowser.xaml.cs chapter3\Properties chapter3\Properties\AppManifest.xml chapter3\Properties\AssemblyInfo.cs Simply executing msbuild.exe with the project file specified as the command-line parameter causes MSBuild to execute, compile, and package this application. The output from msbuild.exe looks like this:
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