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Re^6: Combine data in table

by DrAxeman (Beadle)
on Aug 07, 2005 at 19:49 UTC ( #481731=note: print w/ replies, xml ) Need Help??


in reply to Re^5: Combine data in table
in thread Combine data in table

#!/usr/bin/perl use strict; use warnings; use DBI; use Data::Dumper; # Connect to the database, (the directory containing our csv file(s)) my $dbh = DBI->connect("DBI:CSV:f_dir=.;csv_eol=\n;"); # Associate our csv file with the table name 'results' $dbh->{'csv_tables'}->{'results'} = { 'file' => "psinfooutputdiskfile. +csv"}; my @rows = $dbh->selectall_arrayref("SELECT IP FROM results GROUP BY I +P"); print Dumper @rows;
Fails. If I take the GROUP BY off, everything is OK. Same with the SUM statements.

"SELECT IP FROM results" works
"SELECT IP FROM results GROUP BY IP" and "SELECT SUM(PartitionSize), SUM(PartitionFree) FROM results" fail.


Comment on Re^6: Combine data in table
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Re^7: Combine data in table
by davidrw (Prior) on Aug 07, 2005 at 20:19 UTC
    doh. after all this, 'GROUP BY' isn't supported by DBD::CSV ... following is from the cb:
    davidrw 2005-08-07 16:03:24-04 jZed (or anyone) did you see 481726 and replies? Any reason that a + "GROUP BY" sql statement wouldn't work w/DBD::CSV ? bart 2005-08-07 16:05:53-04 Because it didn't get implemented? castaway 2005-08-07 16:06:22-04 always a good reason ;) davidrw 2005-08-07 16:08:10-04 not implemented? doh! is that a guess or a fact? davidrw 2005-08-07 16:08:59-04 davidrw goes to skim DBD::CSV docs for known bugs/limitations davidrw 2005-08-07 16:10:24-04 davidrw doesn't find anything obvious in DBD::CSV or DBD::File pod Zaxo 2005-08-07 16:12:43-04 since there isn't a db daemon managing things, constructs like tha +t have to be written from scratch in DBD::CSV castaway 2005-08-07 16:13:25-04 right Corion 2005-08-07 16:13:41-04 Hmmm. "Group By" would likely be a hash filter sitting between the + row-scanner and the aggregator function(s) Corion 2005-08-07 16:14:03-04 ... so it "shouldn't be hard". But then, what do I know about DBDs + :) davidrw 2005-08-07 16:14:24-04 hmm.. true. davidrw 2005-08-07 16:15:15-04 i wonder if any other non-db-daemon DBD:: modules implement GROUP +BY? Zaxo 2005-08-07 16:16:32-04 Berkeley might, but I don't know Corion 2005-08-07 16:17:55-04 davidrw: SQLite does. :) davidrw 2005-08-07 16:18:42-04 ah. y, i knew that -- i use it a lot :) davidrw 2005-08-07 16:18:52-04 it's been a slow lazy sunday ...
      But is does work! At least in version 0.22 of DBD::CSV.

      CountZero

      "If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law

      doh. after all this, 'GROUP BY' isn't supported by DBD::CSV
      Sorry, you're mistaken, it is supported. See my reply elsewhere in this thread. The place to look for the SQL syntax supported by DBD::CSV is in SQL::Statement::Syntax. GROUP BY has been supported for the past several releases, but I'd recommend getting the latest release (of SQL::Statement) in any case.

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