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Now that you can build a family of related class types, you need to learn the laws of VB 2005 casting operations. To do so, let s return to the Employees hierarchy created earlier in this chapter. Under the .NET platform, the ultimate base class in the system is System.Object. Therefore, everything is-a Object and can be treated as such. Given this fact, it is legal to store an instance of any type within an object variable: ' A Manager "is-a" System.Object. Dim frank As Object = _ New Manager("Frank Zappa", 9, 3000, 40000, "111-11-1111", 5) In the Employees system, Managers, SalesPerson, and PTSalesPerson types all extend Employee, so we can store any of these objects in a valid base class reference. Therefore, the following statements are also legal: ' A Manager "is-a" Employee too. Dim moonUnit As Employee = New Manager("MoonUnit Zappa", 2, 3001, _ 20000, "101-11-1321", 1) ' A PTSalesPerson "is-a" SalesPerson. Dim jill As SalesPerson = New PTSalesPerson("Jill", 834, 3002, _ 100000, "111-12-1119", 90) The first law of casting between class types is that when two classes are related by an is-a relationship, it is always safe to store a derived type within a base class reference. Formally, this is called an implicit cast, as it just works given the laws of inheritance. This leads to some powerful programming constructs. For example, assume you have defined a new method within your current module: Sub ' ' End FireThisPerson(ByVal emp As Employee) Remove from database... Get key and pencil sharpener from fired employee... Sub

You issued a restore database command and notice that the datafiles associated with readonly tablespaces were not restored.

Because this method takes a single parameter of type Employee, you can effectively pass any descendent from the Employee class into this method directly, given the is-a relationship: ' Streamline the staff. FireThisPerson(moonUnit) FireThisPerson(jill) ' "moonUnit" was declared as an Employee. ' "jill" was declared as a SalesPerson.

The test-link.txt directory entry points to the data in test.txt. To get rid of the entry, just delete it. Do not worry; the original file will not be affected. One big drawback of hard links is that you cannot tell if a file is the original directory entry, so most file systems, NTFS included, do not allow hard-linking directories; there is no way to detect a circular reference that would cause an infinite loop. That is why NTFS provides junction

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Use the check readonly command to instruct RMAN to restore datafiles associated with readonly tablespaces. RMAN> RMAN> RMAN> RMAN> RMAN> connect target / startup mount; restore database check readonly; recover database; alter database open;

The following code compiles given the implicit cast from the base class type (Employee) to the derived type However, what if you also wanted to fire Frank Zappa (currently stored in a generic SystemObject reference) If you pass the frank object directly into TheMachineFireThisPerson() as follows: ' This will only work if Option Strict is Off! Dim frank As Object = _ New Manager("Frank Zappa", 9, 3000, 40000, "111-11-1111", 5) FireThisPerson(frank) you will find the code will only work if Option Strict is disabled However, if you were to enable this option for your project (which is always a good idea), you are issued a compiler error The reason is you cannot automatically treat a SystemObject as a derived Employee directly, given that Object is-not-a Employee As you can see, however, the object reference is pointing to an Employee-compatible object.

You can satisfy the compiler by performing an explicit cast This is the second law of casting: you must explicitly downcast using the VB 2005 CType() function Recall that CType() takes two parameters The first parameter is the object you currently have access to The second parameter is the name of the type you want to have access to The value returned from CType() is the result of the downward cast Thus, the previous problem can be avoided as follows: ' OK even with Option Strict enabled FireThisPerson(CType(frank, Manager)) As you will see in 9, CType() is also the safe way of obtaining an interface reference from a type Furthermore, CType() may operate safely on numerical types, but don t forget you have a number of related conversion functions at your disposal (CInt() and so on).

Another alternative is to explicitly restore the read-only tablespaces after you have restored the regular datafiles. In this example, two read-only tablespaces are restored after the entire database has been restored: RMAN> RMAN> RMAN> RMAN> RMAN> RMAN> connect target / startup mount; restore database; restore tablespace MAR05DATA, JUN05DATA; recover database; alter database open;

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