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ASP, CGI and PHP Scripts and Record-Locking: What Every Webmaster Needs To Know
By: Sunil J. Tanna
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    Table of Contents:
  • ASP, CGI and PHP Scripts and Record-Locking: What Every Webmaster Needs To Know
  • Top site scripts...
  • There are a...
  • They can store...
  • Of course...
  • Now, let's summarize...
  • This article is...

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    ASP, CGI and PHP Scripts and Record-Locking: What Every Webmaster Needs To Know - There are a...

    (Page 3 of 7 )

    3. There are a number of ways things can now go wrong, for

    (a) What if the first copy of the script reads in the data, then
    the second copy reads the same data, then the first copy updates
    the data, then the second copy updates the data? Answer: any
    changes made by the first copy of the script can get lost.

    (b) What if the first and second copy of scripts are both adding
    multiple bits of new data to the store at the same time? For
    example, imagine each needs to store the headline, description
    and the name of the person posting a classified ad. Well, what
    can happen (with some scripts) is the two classified ads can get
    intermingled, so you might get (for example) HEADLINE-1,
    Or worse yet, you might get bits of each part of each classified
    ad, mixed with the bits of the other. This type of thing is
    usually really bad news, as your data may consequently becoming
    unusable from that point on.

    Does this sound too unlikely a problem to worry about? Don't bank
    on it... even if it happens only 1 time in 1,000, or 1 in 10,000,
    eventually it will happen: You need a solution.

    So the real question is: is it possible for programmers to create
    scripts without these kinds of problems? Fortunately the answer
    is yes, and there are a number of ways that programmers can
    address it:

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