Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

Actually, there is nothing in the database design preventing a double entry in the repository. Only the application is enforcing data integrity.

You notice that the script is deleting the current version of the application stored, in order to avoid such duplicate.

The real repository has a further control, a UNIQUE key on "name" + "vers" (which is defined NOT NULL) + the file CRC calculated before the update, so that duplicates are harder to pass. This rule relies on the assumption that all application versions are incremented automatically at each build.

Add to this that the ones allowed to update this table are all seasoned developers, who are using the same application to update. They are all disciplined and each one is in charge of a different application, so I didn't have a single case of double entries in this paradigm.

Thanks for your comments.

 _  _ _  _  
(_|| | |(_|><
 _|   

In reply to Re: Re: Handling huge BLOB fields with DBI and MySQL by gmax
in thread Handling huge BLOB fields with DBI and MySQL by gmax

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (7)
    As of 2014-11-29 06:50 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My preferred Perl binaries come from:














      Results (203 votes), past polls