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class QuoteFetch { public QuoteFetch(string symbol) { this.symbol = symbol; } public string Last { get { string url = "http://moneycentral.msn.com/scripts/" + "webquote.dll ipage=qd&Symbol="; url += symbol; ExtractQuote(ReadUrl(url)); return(last); } }

where patch_directory is the directory into which the patch was unzipped The next illustration shows this step, and the start of the output

The two terms function and subroutine are used interchangeably in Perl If you want to be strict on the semantics, small pieces of named blocks of code that accept arguments and return values are called subroutines The built-in subroutines in Perl are usually referred to as Perl s functions, because they provide additional functionality A subroutine created as part of a class definition is called a method see 10 for more information In truth, there s not a lot between subroutines and functions, although personally I prefer the latter

Subroutines, like variables, can be declared (without defining what they do) or declared and defined To simply declare a subroutine, you use one of the following forms:

8 Confirm the patch application with this command:

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where NAME is the name of the subroutine you are creating, PROTO is the prototype for the arguments the subroutine should expect when called, and ATTRS is a list of attributes that the subroutine exhibits The PROTO and ATTRS arguments are optional we ll be discussing these elements separately in the Prototypes and Attributes sections later in this chapter An undefined subroutine does nothing, but it does let the rest of the script know that such a subroutine exists When used in combination with prototypes, it allows calls to subroutines to be checked However, declaring subroutines without actually defining them is not required we do not need to tell Perl the names of the subroutines we expect to create If you want to declare and define a function, then you need to include the BLOCK that defines its operation:

Database Control can connect to MetaLink and identify lists of advised patches The Support Workbench can classify errors into named problems, each consisting of one or more incidents Diagnostic information is stored in files in the ADR, located by default in the ORACLE_BASE directory All diagnostic information in the ADR relevant to a problem can be packaged for transmission to Oracle Support Services

You can also create anonymous subroutines subroutines without a name by omitting the NAME component:

string ReadUrl(string url) { Uri uri = new Uri(url); //Create the request object WebRequest req = WebRequest.Create(uri); WebResponse resp = req.GetResponse(); Stream stream = resp.GetResponseStream(); StreamReader sr = new StreamReader(stream); string s = sr.ReadToEnd(); return(s); } void ExtractQuote(string s) { // Line like: "Last</TD><TD ALIGN=RIGHT NOWRAP><B> 78 3/16" Regex lastmatch = new Regex(@"Last\D+( <last>.+)<\/B>"); last = lastmatch.Match(s).Groups[1].ToString(); } string string } class Test { public static void Main(string[] args) { if (args.Length != 1) Console.WriteLine("Quote <symbol>"); else { // GlobalProxySelection.Select = new DefaultControlObject("proxy", 80); QuoteFetch q = new QuoteFetch(args[0]); Console.WriteLine("{0} = {1}", args[0], q.Last); } } } In this age of Web services, screen scrapers are generally seen as pass . If a Web service is available that offers the equivalent functionality, you should use it over a screen scraper. However, it s interesting to note that it has been more than three years since this code was written (in the first edition of this book), and it still works as well today as it did when first written. symbol; last;

However, you can t create an anonymous subroutine without a definition (Perl has no way of later attaching the definition without knowing the subroutine s name) You will also need to assign the subroutine to a scalar variable so that you can call it later; for example:

Patch sets raise the release level of the product The Opatch utility installs patches and updates the inventory

6:

The ADR is a file-based repository, accessible no matter what the state of the instance and the database The ADR location is determined by the DIAGNOSTIC_DEST instance parameter, which will default to the ORACLE_BASE environment variable Maintenance of the ADR is automatic: the instance (and other processes, such as database listeners) will create their own directories and files in the ADR PART III

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