ops$tkyte%ORA11GR2> commit; Commit complete. ops$tkyte%ORA11GR2> select * from t; C1 C2 ------------------------------ -----------------------------this_is_NOT_encrypted this_is_encrypted So far, it is not clear that we have achieved anything here; it is not clear what the keyword ENCRYPT has done for us yet. Let s close the wallet to simulate the environment that would be in place if someone stole our database (they would not be able to open the wallet). So, we ll close the wallet and try to modify/retrieve encrypted data: ops$tkyte%ORA11GR2> alter system set encryption wallet close identified by foobar; System altered. ops$tkyte%ORA11GR2> insert into t values 2 ( "this_is_NOT_encrypted", 3 "this_is_encrypted" ); insert into t values * ERROR at line 1: ORA-28365: wallet is not open ops$tkyte%ORA11GR2> insert into t values 2 ( "this_is_NOT_encrypted", 3 null ); 1 row created. ops$tkyte%ORA11GR2> select c1 from t; C1 -----------------------------this_is_NOT_encrypted this_is_NOT_encrypted ops$tkyte%ORA11GR2> select c2 from t; select c2 from t * ERROR at line 1: ORA-28365: wallet is not open As you can see, if we attempt to insert a value into the encrypted column, we receive the ORA-28365 error. If we attempt to retrieve the encrypted data, we receive the same error. I would like to point out that this error is not saying No, you cannot have access to this data. Rather (and this is important), the error is saying Sorry, but I cannot provide anyone access to this data. I don t have the keys necessary to access it. This is an important distinction because it is that fact that protects our data. This is not access control in place, restricting our access to the data via software; this is a physical limitation because the database itself cannot process the data. It just has the raw encrypted data and can t produce an unencrypted version of it. Opening the wallet again will be the only way to provide access to that data:
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have done in Figure 7-16.
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Type specifications are special metadata items residing in the TypeSpec table and representing constructed types (pointers, arrays, function types, and so on) as opposed to TypeDefs and TypeRefs, which represent types (classes, interfaces, and value types). A common example of a constructed type is a vector or an array of classes or value types. Consider the following code snippet: .locals init(int32[0...,0...] iArr) // Declare 2-dim array reference ldc.i4 5 // Load size of first dimension ldc.i4 10 // Load size of second dimension // Create array by calling array constructor: newobj instance void int32[0...,0...]::.ctor(int32,int32) stloc iArr // Store reference to new array in iArr In the newobj instruction, we specified a MemberRef of the constructor method, parented not by a type but by a constructed type, int32[0...,0...]. The question is, Whose .ctor is it, anyway The arrays and vectors are generic types and can be instantiated only in conjunction with some nongeneric type, producing a new class in this case, a two-dimensional array of 4-byte integers with zero lower bounds. So the constructor we called was the constructor of this class. And, of course, about the only possible way to represent a constructed type is by a signature. That s why TypeSpec records have only one entry, containing an offset in the #Blob stream, pointing at the signature. Personally, I think it s a pity the TypeSpec record contains only one entry; a Name entry could be of some use. We could go pretty far with named TypeSpecs. Most obvious possibilities include type aliasing and type forwarding. The TypeSpec signature has no calling convention and consists of one SET, which, however, can be fairly long. Consider, for example, a multidimensional array of function pointers that have function pointers among their arguments. TypeSpec tokens can be used with all IL instructions that accept TypeDef or TypeRef tokens. In addition, as you ve seen, MemberRefs can be scoped to TypeSpecs as well as TypeRefs. The only places where TypeSpecs could not replace TypeDefs or TypeRefs in versions 1.0 and 1.1 were the extends and implements clauses of the class declaration, but in version 2.0 the TypeSpecs can be used there as well, because the generic type instantiations are represented by TypeSpecs (more about generic types and instantiations in 11). Two additional kinds of TypeSpecs, other than vectors and arrays, are unmanaged pointers and function pointers, which are not true generics, in that no abstract class exists from which all pointers inherit. Of course, both types of pointers can be cast to the value type int ([mscorlib]System.IntPtr), but this can hardly help the int value type is oblivious to the type being pointed at, so such casting results only in loss of information. Pointer kinds of TypeSpecs are rarely used, compared to array kinds, and have limited application.
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Contextual keywords are identifiers that act as keywords only in certain language constructs. In those positions, they have particular meanings; but unlike keywords, which cannot ever be used as identifiers, contextual keywords can be used as identifiers in other parts of the code. Table 2-4 contains the list of contextual keywords. Table 2-4. The C# Contextual Keywords add get orderby where ascending global partial yield by group remove descending into select dynamic join set equals let value from on var
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Table 10-1. Properties of the SPWorkflow Class
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As you can imagine, much of the implementation logic is going to be in content generation for the lblBasicQuote Label control because that is where all the quote information will reside. To do this, we have a method with a similar signature to the GetCompanyInfo method called GetBasicCode, which calls the CompanyInfoService web service to provide data for this Label control. Here s the code for that method:
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Delegates and lambda expressions are discussed in 10.
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The garbage collector doesn t call the destructors in any particular order, so you cannot rely on objects being destroyed in the order in which they were created. You must write your destructors defensively, making no assumptions about the state of other objects.
Setting the Server Context
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