winforms pdf 417 reader

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We d have to write a procedural constraint to enforce this kind of integrity rule The result of this mismatch of subtypes is that the inheritance structure in your model must be persisted in an SQL database that doesn t offer an inheritance strategy Fortunately, three of the inheritance mapping solutions we show in chapter 5 are designed to accommodate the representation of polymorphic associations and the efficient execution of polymorphic queries The next aspect of the object/relational mismatch problem is the issue of object identity You probably noticed that we defined USERNAME as the primary key of our USERS table Was that a good choice How do we handle identical objects in Java.

namespace AspNetAjaxInAction { [ScriptService] [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class GeocodeService : System.Web.Services.WebService { [WebMethod] public Location GetLocationData(string street, string zip, string city, string state, string country) { return YahooProvider.GetLocationData(street, zip, city, state, country); } } }

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side-effect free . This is required because testing conditions should not change the state of the object itself . In addition, all members referenced in a precondition test must be at least as accessible as the method defining the precondition . This is required because callers of the method should be able to verify that they have met all the preconditions prior to invoking the method . On the other hand, members referenced in a postcondition or invariant test can have any accessibility as long as the code can compile . The reason why accessibility isn t important here is because postcondition and invariant tests do not affect the callers ability to invoke the method correctly .

Summary

If you ve ever changed email providers, you ve probably experienced the pain of transferring your data. Copying old email manually is a cumbersome process, and transferring your address book isn t much easier. A similar problem constantly happens today with accounts that have multiple terminals. When you send and receive Gmail from your desktop, laptop, and phone, you expect the same emails to be visible everywhere. But if you use a POP3 email program from an ISP, emails might only be seen from the computer that sent them. When the same information is available in multiple places, we say that it s synchronized. Synchronization refers to the process of ensuring that the most up-to-date information is available on all terminals. Software developers have been trying to solve the synchronization problem for decades, and though they ve gotten closer, it continues to be a tricky problem. A single master repository should hold the definitive view of a user s information, such as their calendar. Users generally won t directly interact with this repository; instead, they ll use other programs to create Storage calendar events and receive event reminders. If the user creates an event in one program, it must also display on the other. Figure 15.8 shows how this process is handled for Google Google accounts. All devices connect to the cloud, which stores all the data. When a user creates an event on her Web Mobile phone, it s transferred to her remote calendar. The next Browser Phone time the user connects to the calendar with her desktop browser, she receives the event. Figure 15.8 Synchronizing Because mobile devices have unreliable network con- data across multiple nections, the system needs to be extremely robust in the terminals

Figure 29-9 In sandwich integration, you integrate top-level and widely used bottom-level classes first, and save middle-level classes for last.

Active Directory Rights Management Service, or AD RMS, adds the third part of Microsoft s data encryption strategy EFS and RMS are outside the scope of this chapter) BitLocker does require that a computer be configured with multiple volumes (partitions) A computer will start from the active partition, sometimes called the system partition or system volume The operating system is installed on a second volume, which Windows Server 2008 documentation usually calls the Windows OS volume, but older documentation refers to as the boot partition (Yes, for those keeping score: You never did boot from the boot partition and no Windows system files are on the system partition) The active partition is not encrypted, but the Windows OS volume is In other words, BitLocker encrypts everything written to a protected volume: code, data, and temporary files.

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