Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!husc6!ogccse!blake!ndsuvax!ncsmith
From: ncsmith@ndsuvax.UUCP (Timothy Lyle Smith)
Newsgroups: comp.lang.pascal
Subject: Re: Deleting records from TYPED file
Keywords: turbo pascal
Message-ID: <2884@ndsuvax.UUCP>
Date: 4 Sep 89 22:39:53 GMT
References: <833@cbnewse.ATT.COM>
Reply-To: ncsmith@ndsuvax.UUCP (Timothy Lyle Smith)
Organization: North Dakota State University, Fargo
Lines: 18

In article <833@cbnewse.ATT.COM> rtf1@cbnewse.ATT.COM (richard.t.ferber) writes:
>I am writing a simple database program in Turbo Pascal (version 5) that
>uses a TYPED file to store data records. One of the basic operations I
>want the program to do is to delete records in the file (along with add,
[stuff about lack of delete operation on TYPEd files]

    If you are going to be changing the size of the file often it would
  be quickest to mantain a freelist internal to the file.  You could either
  sacrafice a record to be the head of the list or you could store the
  head of the list off in a different file.  To link you freelist together
  you could cast a record type containing your link field onto the record
  that you are unlinking or linking from/to the free list.

-- 
Tim Smith     North Dakota State University,  Fargo, ND  58105
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