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Structs themselves are, under the covers, derived from System.ValueType, which is derived from object. The two inheritance-associated keywords you can use with struct members are the new and override modifiers, when creating a member with the same name as a member of base class System.ValueType, from which all structs are derived.
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ADVANCED SILVERLIGHT FEATURES
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The following code illustrates the Element and Elements methods: using System; using System.Collections.Generic; using System.Xml.Linq; class Program { static void Main( ) { XDocument employeeDoc = new XDocument( new XElement("Employees", new XElement("Employee", new XElement("Name", "Bob Smith"), new XElement("PhoneNumber", "408-555-1000")), new XElement("Employee", new XElement("Name", "Sally Jones"), new XElement("PhoneNumber", "415-555-2000"), new XElement("PhoneNumber", "415-555-2001")) ) ); Get first child XElement named Employees XElement root = employeeDoc.Element("Employees"); IEnumerable<XElement> employees = root.Elements(); foreach (XElement emp in employees) { Get first child XElement named Name XElement empNameNode = emp.Element("Name"); Console.WriteLine(empNameNode.Value); Get all child elements named "PhoneNumber" IEnumerable<XElement> empPhones = emp.Elements("PhoneNumber"); foreach (XElement phone in empPhones) Console.WriteLine(" {0}", phone.Value); } } } This code produces the following output: Bob Smith 408-555-1000 Sally Jones 415-555-2000 415-555-2001
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Note The example in this section was performed on a NOARCHIVELOG-mode database. If you are in ARCHIVELOG
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theList->Add( gcnew String("bad data")); try { book = safe_cast<Book^>( theList[1] ); } catch(InvalidCastException^ e) { Console::WriteLine("An object of the wrong type was put on the list."); } } Not only is the cast a performance hit, but also, as discussed in 10, it s inefficient to rely on a runtime exception to detect an incorrect use of the collection. To push this error to compile time, use the ArrayList: the List<T> generic type, or better yet, the IList<T> generic interface. The generic List<T>, when used with a reference type, requires the type argument to be a handle type. In for each statements, the type argument is used directly, rather than a handle to Object, as is used when iterating the weakly typed collection (see Listing 11-21). Listing 11-21. Iterating with for each and with an Index // list_generic.cpp using namespace System; using namespace System::Collections::Generic; int main() { List<String^>^ list = gcnew List<String^>(); // or IList<String^>^ list = gcnew List<String^>(); list->Add("apple"); list->Add("banana"); // Iterate using the for each operator. for each (String^ s in list) { Console::WriteLine( s ); } // Iterate using indexing. for (int i = 0; i < list->Count; i++) { Console::WriteLine("{0} {1}", i, list[i]); } }
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RECO has a very focused job: it recovers transactions that are left in a prepared state because of a crash or loss of connection during a two-phase commit (2PC). A 2PC is a distributed protocol that allows for a modification that affects many disparate databases to be committed atomically. It attempts to close the window for distributed failure as much as possible before committing. In a 2PC between N databases, one of the databases typically (but not always) the one the client logged into initially will be the coordinator. This one site will ask the other N-1 sites if they are ready to commit. In effect, this one site will go to the N-1 sites and ask them to be prepared to commit. Each of the N-1 sites reports back its prepared state as YES or NO. If any one of the sites votes NO, the entire transaction is rolled back. If all sites vote YES, then the site coordinator broadcasts a message to make the commit permanent on each of the N-1 sites. Say a site votes YES and is prepared to commit, but before it gets the directive from the coordinator to actually commit, the network fails or some other error occurs, then the transaction becomes an indoubt distributed transaction. The 2PC tries to limit the window of time in which this can occur, but cannot remove it. If there is a failure right then and there, the transaction will become the responsibility of RECO. RECO will try to contact the coordinator of the transaction to discover its outcome. Until it does that, the transaction will remain in its uncommitted state. When the transaction coordinator can be reached again, RECO will either commit the transaction or roll it back. It should be noted that if the outage is to persist for an extended period of time, and you have some outstanding transactions, you can commit/roll them back manually. You might want to do this since an in-doubt distributed transaction can cause writers to block readers this is the one time this can happen in Oracle. Your DBA could call the DBA of the other database and ask her to query the status of those indoubt transactions. Your DBA can then commit or roll them back, relieving RECO of this task.
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This chapter covers .NET Service Bus.
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they are hooked into the application at the correct places. Whenever data comes into the database, you are responsible for encrypting the data, and whenever it leaves, you are responsible for decrypting it. This comes at the expense of yet more code to be developed as well as a definite performance impact, which we ll measure shortly. A third reason to give serious thought before employing manual application encryption is that the application has to be involved in the process; in fact, every application that touches this data will have to be involved. This is because the column that will be encrypted must (I stress the word must here) use the RAW datatype as its underlying datatype. If you are to encrypt a LAST_NAME column that was originally defined as a VARCHAR2(70), you will be redefining that column to be a RAW(80). You must use a RAW datatype because the result of encrypting data is a binary set of bytes; they are not characters. You cannot store them in a character datatype such as VARCHAR2. I ll refer you to 12 Datatypes and the discussion on NLS character set conversion for the reason why this is so. The VARCHAR2 type is subject to character set conversion and the bytes that one client sees can and will be different from the bytes another client sees in a VARCHAR2 string. When dealing with true character strings, it is definitely a bad thing; it s called corrupting the data. Character set conversion would tend to change the encrypted data, making it so you cannot decrypt it anymore (that is, you just lost it forever). I ve seen that happen more than once in real life. The developers used a VARCHAR2 to store encrypted data and the fact that the conversion had taken place was not detected for some time, effectively destroying that bit of data. If it had been detected early, near the point of the corruption being introduced, we could have resurrected the data from backups (before the implicit conversion corrupted it) but it would have been a non-trivial task. Also, note that I said that a VARCHAR2(70) would require a RAW(80). This is because encrypted data is stored in multiples of 16 bytes. It takes five 16 byte pieces of raw data to store 70 single byte characters (or 71, 72 and so on). So unless your existing data attribute byte length is divisible by 16, you ll be computing a new field length. Again, a mistake I ve frequently seen is for a developer to try to store the encrypted data in the existing VARCHAR2(70) field it won t work because of the implicit character set conversion that will corrupt the data some day, and it won t work because it simply won t fit in that field. Sure, some of the data will any of the data that was 64 bytes or less before encrypting would fit, but a value that was 65 bytes or more would need 80 bytes after encrypting. This gets even worse when you start considering multibyte data!
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The using Namespace Directive
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value, which depends only on how many items you might have to load simultaneously for computational purposes. For example, if you declare 20 local variables, you don t need to declare .maxstack 20; but if your method is calling another method that takes 20 arguments, you need to ensure that the stack has sufficient depth, because you will need at least to load all 20 arguments on the stack to make the call. The number of local variables for any given method cannot exceed 65535 (0xFFFF), because the local variable ordinals are represented in the CLR by unsigned short integers. The same limitation is imposed on the number of method parameters (including the return), for the same reason.
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CHAPTER 12 AN INTRODUCTION TO THE STL/CLR LIBRARY
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