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Once you have established the active connection and SQL command, the next step is to submit the query to the data source As you might guess, you have a number of ways to do so The DbDataReader type (which implements IDataReader) is the simplest and fastest way to obtain information from a data store Recall that data readers represent a read-only, forward-only stream of data returned one record at a time Given this, it should stand to reason that data readers are useful only when submitting SQL selection statements to the underlying data store Data readers are useful when you need to iterate over large amounts of data very quickly and have no need to maintain an in-memory representation For example, if you request 20,000 records from a table to store in a text file, it would be rather memory-intensive to hold this information in a DataSet.

FirstWord the You do not need to worry about converting objects to PSObject instances most of the time; any object returned by a cmdlet is already converted for you Just have the technique in mind, so that you know how to find your way out when you get to that raw object..

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Instead of entering each command piecemeal, you can create a command file with a number of commands and execute the command file. Use the keyword cmdfile to let RMAN know that it must execute the commands inside the script file command. The individual commands in the command file will execute as if they were entered from the command line. Here s an example showing how to execute a command file named commandfile.rcv: $ rman target / cmdfile commandfile.rcv In this example, the commandfile.rcv file is in the same directory from which you re executing the cmdfile command. If the command file is elsewhere, you must provide the complete path name to access that file. For example: $ rman target / cmdfile /oracle/dbs/cmd/commandfile.rcv You can also execute a command file by placing the @ sign in front of the command file, as shown in the following example: $ rman target / @commandfile.rcv You aren t limited to invoking command files from the command line, though that is very useful when using cron to automate your work. You also have the option of running command files interactively from the RMAN prompt:

A better approach is to create a data reader that spins over each record as rapidly as possible Be aware, however, that data reader objects (unlike data adapter objects, which you ll examine later) maintain an open connection to their data source until you explicitly close the session Data reader objects are obtained from the command object via a call to ExecuteReader() When invoking this method, you may optionally instruct the reader to automatically close down the related connection object by specifying CommandBehaviorCloseConnection The following use of the data reader leverages the Read() method to determine when you have reached the end of your records (via a false return value) For each incoming record, you are making use of the type indexer to print out the make, pet name, and color of each automobile.

$ rman target / RMAN> @commandfile.rcv RMAN> This approach is useful when you want to execute a script of RMAN commands and then do more work from the RMAN command line. After executing the command file, you ll be back at the RMAN prompt. Once RMAN finishes executing the contents of the command file you specify, control returns to RMAN once again, and you ll see the following comment on the screen: RMAN> **end-of-file**

Also note that you call Close() as soon as you are finished processing the records, to free up the connection object: Sub Main() .. ' Obtain a data reader a la ExecuteReader() Dim myDataReader As SqlDataReader myDataReader = myCommandExecuteReader(CommandBehaviorCloseConnection) ' Loop over the results While myDataReaderRead() ConsoleWriteLine("-> Make: {0} , PetName: {1} , Color: {2}", _ myDataReader("Make")ToString()Trim(), _ myDataReader("PetName")ToString()Trim(), _ myDataReader("Color")ToString()Trim()) End While myDataReaderClose() ShowConnectionStatus(cn) End Sub.

A little-known fact among PowerShell users is that PSObject is a public type and we can create instances of it What we get back is an empty object with no methods or properties What good is it, then Well, combined with the power of Add-Member, we can build custom objects PowerShell does not offer built-in support for defining classes, methods, and properties, but we can simulate that support by creating PSObject instances and adding the members we need This way, we can encapsulate code that works over the same data in a custom object with its own properties and methods Such objects are especially useful when returning data from a reusable function This nuisance pops up often Say we have a function that returns data about different people.

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