Kee Hinckley wrote:
>
> >
> > At 17:18 28.04.2002, Ernest Lergon wrote:
> > >Now I'm scared about the memory consumption:
> > >
> > >The CSV file has 14.000 records with 18 fields and a size of 2 MB
> > >(approx. 150 Bytes per record).
> >
> > Now a question I would like to ask: do you *need* to read the whole CSV
> > info into memory? There are ways to overcome this. For example, looking at
>
> When I have a csv to play with and it's not up to being transfered to a real
> database I use the DBD CSV module which puts a nice sql wrapper around
> it.
>
I've installed DBD::CSV and tested it with my data:
$dbh =
DBI->connect("DBI:CSV:csv_sep_char=\t;csv_eol=\n;csv_escape_char=")
$dbh->{'csv_tables'}->{'foo'} = { 'file' => 'foo.data'};
3 MB memory used.
$sth = $dbh->prepare("SELECT * FROM foo");
3 MB memory used.
$sth->execute();
16 MB memory used!
If I do it record by record like
$sth = $dbh->prepare("SELECT * FROM foo WHERE id=?");
than memory usage will grow query by query due to caching.
Moreover it becomes VERY slow because of reading every time the whole
file again; an index can't be created/used.
No win :-(
Ernest
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