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Figure 4-16. Selecting the database 5. We now see a list of all the databases within the server. As shown in Figure 4-17, select ApressFinancial as this is the only database this role will access.
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Figure 20-8. Sharpening an image can give it better definition, but keep checking the preview.
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Unnests not exists subquery with one or more tables if possible. Enables unnesting of correlated subqueries. Enable ordered semi-join (exists) subquery. Enables costing of equality semi-join (exists). Always use this method for anti-join (not exists) when possible. Always use this method for semi-join (exists) when possible. Forces correct computation of subquery selectivity. Enables unnesting of subqueries in a bottom-up manner.
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<form:form> <form:errors cssClass="errors" path="username"/> <label>Username: <form:input path="username"/></label> <input type="submit" name="_eventId_cancel" value="Cancel"/> <input type="submit" name="_eventId_preview" value="Preview User"/> </form:form> This allows the user to specify the name of the user to be created, and to click either a Cancel button taking them back out of the workflow to the list of users or a Preview button taking them to the next state of the workflow. The specific event to raise when processing a request or submission is indicated by the _eventId parameter. In the preceding form, the two events that we can raise are provided in the names of the Submit buttons, which raise the cancel and preview events, respectively, causing the transitions shown in Listing 6-26 to be invoked (the on attribute of the transition element identifies the event that causes the transition to occur). If we were raising the event with a GET request to the web flow, we could provide these as normal parameter values (for example, /admin/create _eventId=preview).
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s You could use the same command object for both commands, but this doesn t save you anything, and Tip
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suggesting that you are invoking a platform-specific binary. Basically, P/Invoke lets you create a managed entry point to your native function. If the native code you want to call is not exposed as a native, exported function, you can t use P/Invoke. P/Invoke works well for calling Win32 APIs, and it is widely used in CLI languages for this purpose. There are some complexities in using P/Invoke, since you have to declare managed analogs for any native structs that are passed into the function, and this is sometimes tricky. Also, there is considerable overhead due to switching from managed to native code and back again, as you ll see. In addition to P/Invoke, the CLR provides support for COM interop. You can create instances of proxy objects to COM objects in managed code. Usually this will involve creating a wrapper assembly that contains managed types that expose the COM interfaces to your managed code. Visual Studio contains several tools that simplify this process, such as tlbimp.exe, which creates a wrapper assembly from a typelib (TLB file) that is usually present with a COM library. You can also go the other way, exposing managed objects to COM. This process involves attributing the types with COM attributes, specifying, for example, the GUID for the type, and using tlbexp.exe to generate a type library that can be used to instantiate the managed objects from COM as COM objects. All of the previously mentioned interop methods are available to all CLR languages, but in C++/CLI, you have the option of an additional type of interop if you have the C++ source code and can recompile it with the /clr option. Most C++ code will compile with the /clr compiler option with minimal changes, if any. If you do this, you can re-create your native DLL as an assembly. The types are still native, but the instructions are compiled into IL. This code can be used from C++/CLI code (at least in mixed mode) in the same way as you would normally use native C++ code: include the header file and link to the DLL s import library. In pure mode and safe mode, you cannot link in native object files and have the resulting file remain pure or safe. If you can link together object files of different modes, the resulting assembly is downgraded to the lowest common denominator; for example, if you link pure and mixed mode object files, the result is a mixed mode assembly. You can put both native classes and types and managed classes and types in the same assembly in pure and mixed mode. This is useful if you want to expose native classes and types to other .NET languages such as C# or Visual Basic. A typical scenario might be that you would take a native class library s source code, recompile it with the /clr option, and, in the same assembly, add managed classes that wrap the native classes that you want to export to other managed languages. These managed wrappers would be marked public and would be visible to the other language. However, the native classes in the DLL would not be accessible to the clients who use the assembly. To support all this, there are various language features and CLR features. Cross-language interop, P/Invoke, and COM interop are CLR features. I ll discuss cross-language interop, P/Invoke, and COM interop in brief. Using native types and managed types together in the same assembly, for example, in order to create a managed wrapper for a native class library, is the main focus of this chapter. You ll learn how to reference a native type in a managed type, and how to reference a managed type in a native type. You ll see pointer types that help in working with interoperability scenarios, such as interior pointers and pinning pointers. You ll also look into converting types between native and managed equivalents. This type of conversion is usually called marshaling. Interop is an intriguing, complex subject. A full discussion of all the subtle aspects of interop would be impossible in an introductory text, so this chapter will focus on some basic scenarios to give you an idea of what is possible. You could write an entire book on C++ interop.
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When a handler has completed all processing, it should first update the Invocation object it received with any return arguments or data, and then call ContentHandlerServer.finish(). The completed Invocation should be provided, along with a final status of OK, CANCELLED, or INITIATED. This method prompts CHAPI to reserialize the Invocation and return it to the requesting app.
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Yes, we said it, Ethernet. But why do you need to worry about a bunch of category 5e or 6 cables if you have fiber now Because in an Xsan environment, we use the Fibre Channel environment only for streaming actual data. We need a dedicated network for command and control. This means that most Xsan clients will have two Ethernet networks. The first is the standard corporate LAN, which allows for managing network and storage devices, directory services data, and network volumes. It also provides general IP connectivity. The second Ethernet network is dedicated to metadata. An Xsan client uses this network to communicate with an Xsan metadata controller to request access to an existing asset or ask for access to write data. The MDC is responsible for informing the Xsan client about where data will be streamed to a drive. Whenever a SAN client wants to access a SAN resource, it must first request that resource from the SAN s active MDC. This prevents conflicts with other clients on the SAN. The metadata controller is responsible for ensuring the data integrity of the volume and the filesystem objects on it. Because a lot of IO requests may be occurring concurrently, it s critical that the metadata network be very fast and have minimal latency. Nearly every operation performed on an Xsan requires filesystem queries, so any latency introduced between the Xsan clients and MDCs will result in perceivable performance degradation on the volume. This can become particularly problematic if you use your SAN for basic fileserver storage and it contains mostly smaller files. This means you need a good switch. Most often you ll use a managed switch with the management features disabled (especially spanning-tree PortFast). The switch and cabling should be Gigabit and there should be very little latency. You also want very little traffic on the metadata network to help reduce collisions. This means there should be no DHCP server. Also, you shouldn t do management of SANconnected devices using the metadata network. You need no router/default gateway, and DNS shouldn t be running. In addition, make the subnet mask as small as possible, with class C being about the largest. The configuration on the client systems will also be stripped down. You need only an IP address and a subnet mask. List the metadata network second in the Ethernet stack with your organization s main network listed first. Lastly, though not officially required, we recommend you always set up forward and reverse DNS specifically for the metadata network, and when possible, make that data available over it. Creating a new top-level domain, such as metadata.xsan, for this purpose is one common practice. So a primary metadata controller may have a public hostname that resolves to the corporate IP address, and its secondary Xsan interface has an IP address of, which resolves to mdc.metadata.xsan. As an alternative, you can simply create another subdomain, such as, in your organization. In this case the metadata controller would have resolution on its secondary interface point to
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Now switch on autotrace and run the following query. Autotrace under 9i or 10g should report the execution plan that follows this query. select small_vc from t1 where and and ; n1 = 2 ind_pad = rpad('x',40) n2 = 3
Listing 7-3. A Browser Plug-in for Displaying Java Source Files in Compact Format import*; import; import net.rim.device.api.browser.field.*; import net.rim.device.api.browser.plugin.*; import net.rim.device.api.ui.component.RichTextField; public class JavaViewer extends BrowserContentProvider implements BrowserPageContext { String[] MIME_TYPES = new String[] { "text/x-java", "text/x-java-source" }; public String[] getAccept(RenderingOptions context) { return MIME_TYPES; } public BrowserContent getBrowserContent( BrowserContentProviderContext context) throws RenderingException { if (context == null) throw new RenderingException("No context"); BrowserContentBaseImpl browserContent = new BrowserContentBaseImpl( context.getHttpConnection().getURL(), null, context .getRenderingApplication(), context .getRenderingSession().getRenderingOptions(), context .getFlags()); RichTextField contentField = new RichTextField(); String fileName = ""; try { HttpConnection conn = context.getHttpConnection(); InputStream in = conn.openInputStream(); fileName = conn.getFile(); int numBytes = in.available(); StringBuffer builder = new StringBuffer(numBytes); int depth = 0;
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