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Scoping gets even more interesting when pipelines are involved. Blocks in the same pipeline share a single scope. Here is a pipeline that contains two blocks passed to cmdlets applied at a different point in the pipeline. The second block sees variables declared in the first one: PS> dir *.txt | foreach { $file = $_.Name; foreach { "got $file" } got got got got test.txt test2.txt test3.txt test4.txt return 3 } |

Dim c As New ComCalc i = CType(c, _ComCalc) Console.WriteLine("COM server says 10 + 832 is {0}", _ i.Add(10, 832)) Console.ReadLine() End Sub End Module Now, do understand that invoking a method using the Class-suffixed or underscore-prefixed interface is seldom necessary (which is exactly why the Visual Studio 2005 Object Browser hides these types by default). However, as you build more complex .NET applications that need to work with COM types in more sophisticated manners, having knowledge of these types is critical.

record the datafile copies and archived redo logs in the RMAN repository using the catalog command.

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As mentioned, at runtime the CLR will make use of the metadata contained within a .NET interop assembly to build a proxy type that will manage the process of .NET to COM communication. The proxy to which I am referring is the Runtime Callable Wrapper, which is little more than a bridge to the real COM class (officially termed a coclass). Every coclass accessed by a .NET client requires a corresponding RCW. Thus, if you have a single .NET application that uses three COM coclasses, you end up with three distinct RCWs that map .NET calls into COM requests. Figure 17-7 illustrates the big picture.

Note that the first foreach block only sets the $file variable and returns a dummy number. The $file variable is available to the second foreach block that actually returns it. This is very convenient if you wish to store some information at an early stage in the pipeline and have it available at later.

You can also use the transport tablespace command to perform a tablespace transport to a past point in time. Simply add the unitl scn clause to the transport tablespace command, as shown here: RMAN> 2> 3> 4> transport tablespace test1,test2 tablespace destination '/u05/app/oracle/transportdest' auxiliary destination '/u05/app/oracle/auxdest' until SCN 259386;

There is always a single RCW per COM object, regardless of how many interfaces the .NET client has obtained from the COM type (you ll examine a multi-interfaced VB 6.0 COM object a bit later in this chapter). Using this technique, the RCW can maintain the correct COM identity (and reference count) of the COM object.

The preceding command will recover the transportable tablespaces only up to the specified SCN. Instead of the SCN, you can also specify a target point in time or a restore point as well.

Again, the good news is that the RCW is created automatically when required by the CLR. The other bit of good news is that legacy COM servers do not require any modifications to be consumed by a .NET-aware language. The intervening RCW takes care of the internal work. To see how this is achieved, let s formalize some core responsibilities of the RCW.

Almost all script languages have a special function or operation that takes a string as an input parameter, compiles it, and executes it as a piece of code. Other popular languages such as JavaScript call that function eval. PowerShell s equivalent is the Invoke-Expression cmdlet. Strings can be either passed as parameters or piped in from another command. Here is how to execute a simple string like Write-Host invoked expression : PS> Invoke-Expression "Write-Host 'invoked expression'" invoked expression Note that we have to escape quotes or use single quotes inside the string that gets executed. This is quite cumbersome, but it is worth the effort. We can manipulate strings at runtime and create highly dynamic and elegant solutions by building commands on the fly. Let s look at how to generate several commands and pipe them to Invoke-Expression for execution: PS> Got Got Got 1..3 | foreach { "Write-Host 'Got $_'" } | Invoke-Expression 1 2 3

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