in reply to Clean URLs and CGI.pm

What you're talking about is referencing a CGI as the result of an ISINDEX search as opposed to invoking it via a parameter list. CGI plays quite happily either way. From the CGI docs:
FETCHING A LIST OF KEYWORDS FROM THE QUERY: 
@keywords = $query->keywords

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If the script was invoked as the result of an <ISINDEX> search, the parsed keywords can be obtained as an array using the keywords() method.

FETCHING THE NAMES OF ALL THE PARAMETERS PASSED TO YOUR SCRIPT: 

@names = $query->param

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If the script was invoked with a parameter list (e.g. ``name1=value1&name2=value2&name3=value3''), the param() method will return the parameter names as a list. If the script was invoked as an <ISINDEX> script and contains a string without ampersands (e.g. ``value1+value2+value3'') , there will be a single parameter named ``keywords'' containing the ``+''-delimited keywords.

Gary Blackburn
Trained Killer

Replies are listed 'Best First'.
Re: Re: Clean URLs and CGI.pm
by swiftone (Curate) on Jun 11, 2001 at 20:26 UTC
    But it really isn't the result of an ISINDEX. (I think). Here's an example:

    Let's say I'm writing a search script against some database. You can search, you can follow links from the results page to give you more results, you can go to an "advanced search" page and set all sorts of options. So normally, this will be a standard GET or POST setup with multiple values.

    However, because I'm a difficult person, I want it to also accept one parameter without a key-value pair (It will know which field this value belongs to). For example, most search engines have many options, but will work just fine with /search.pl?q=search+terms. I don't want the "q=" or whatever though. I want users who are in the know (and HTML writers who want VERY simple links) to have: "search.pl?term"

    So I can't just use param(), because I don't know which manner the script is being called by. The code I posted works just fine, I just wanted to make sure I wasn't making some grevious error or missing something obvious.

    Did I understand your reply correctly?

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      If you want your CGI called with "search.pl?term" that's fine... all you have to do is $q->param(keywords) in your CGI to access whatever follows the "?" in your URL. If someone calls your script like this "search.pl?field1=term" then the "term" value will appear in $q->param(field1). Just set some if/then's to decide which is which, maybe like this: 
      if ($q->param(keywords)) {
   $field = $q->param(keywords);
} else {
   $field = $q->param(field1);
}

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      Or maybe I don't understand what you want. The 3 main ways of getting data into CGI.pm are via ISINDEX, POST, and GET. Since POST and GET both boil down to key/value pairs they are (to CGI.pm at least) interchangeable. ISINDEX is just a value without a key and is handled in param(keywords). Now why can't you use param again?

      Gary Blackburn
      Trained Killer

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[d/l]
        Just set some if/then's to decide which is which,

        Which would be the code I posted originally. Please look at it, I _AM_ using param. I was just saying I can't assume I'm in only one mode.

        I was really asking if anyone else had done this (I'm not so original as to be the first to do this), and if I was leaving myself open to any security holes and the like, or missing any features of CGI or common idioms to do this.

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