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Let s look at each of these mechanisms next. The @Id annotation Using the javax.persistence.Id annotations is the simplest way of telling the persistence provider where the entity identity is stored. The @Id annotation marks a field or property as identity for an entity. Since we are using property-based persistence for the Category entity, we could let the API know that we are using the id property as the identity by applying the @Id annotation to the getId method as in the following code snippet. In the case of field-based persistence, the @Id annotation would have been applied directly to an instance variable instead. asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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6 Apr 2005 ... Demonstrates a method to draw UPC-A barcodes using C#. ... NET 2003 - 7.87 Kb. Image 1 for Drawing UPC-A Barcodes with C# ... ost libraries that wrap a native API also wrap native resources. In .NET terminology, a native resource can be defined as a native pointer or a handle that is obtained from a native operation and that requires another native operation for cleanup. As discussed in 10, a managed wrapper for a C++ class needs a field that points to the wrapped object. In this case, this field is a managed resource, because for resource cleanup, the native object must be deleted via this field. If you wrap a C-based library like the Win32 API, you usually have to define fields of handle types (e.g., handles for named pipes or for database connections) in your managed wrapper class. Since allocated handles require cleanup, too, they are also native resources. Ensuring that native resources are cleaned up in a reliable way is a task that is much more complicated than it seems at first. In this chapter, I will implement multiple versions of a managed library that wraps a simple native API. Since the Win32 and many other APIs are still C-based libraries, I will wrap a simple C API instead of a C++-based class library this time. The native API that is used for this purpose is shown in the following code. The code is commented so that you can easily compile it and follow the different steps. // XYZLib.cpp // build with "CL /LD /clr XYZLib.cpp" // + "MT /outputresource:XYZLib.dll;#2 /manifest: XYZLib.dll.manifest" #include <windows.h> #pragma comment(lib, "kernel32.lib") #include <iostream> using namespace std; typedef void* HXYZ; struct XYZConnectionState { /* data needed to manage an XYZConnection */ }; extern "C" __declspec(dllexport) HXYZ XYZConnect() { XYZConnectionState* pState = new XYZConnectionState(); asp.net upc-a Barcode UPC-A - CodeProject
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The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the ... ASP . NET /Windows Forms/Reporting Services/Compact Framework ... The callback functions RequestQuoteAsync and OnStockQuoteRequestCompleted give you the illusion of asynchronous communication, but you cannot truly disconnect the calling thread once the request message has been sent out. The burden falls on the client to manage the wait time for a response, but this is handled for you by the autogenerated proxy classes in Visual Studio. A true asynchronous method call completely releases the thread that is used for the request, and then later creates a new thread to receive the response. The limitation here is not with .NET per se, it is with the HTTP-based response/request model, since the HTTP response is delivered over the same underlying connection that sent the request. Simply spacing out the request and the response does not equate to an asynchronous call. One solution available to you is to drop HTTP and to use a different protocol such as TCP The consequence of this . approach is that the architecture of your solution will also need to change. How you do so is a central focus of this chapter.
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