----- Forwarded message from Scanman 20 <[EMAIL PROTECTED]> -----
X-Originating-IP: [12.126.209.38]
From: Scanman 20 <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: nesting queries?
Date: Wed, 11 Apr 2001 09:50:28 -0400
X-OriginalArrivalTime: 11 Apr 2001 13:50:28.0769 (UTC)
FILETIME=[5E2F8110:01C0C28E]
Hi Tim,
I posed this question to alt.perl a while ago but never got an answer from
anyone. Using Perl, Unix and MySQL, is it possible using DBI to nest
database queries? I'm looking to do something like select all the records
from one table, and then while I loop through all the records, run a second
query inside the loop on another table in the same database. Something like
this:
$dbh = DBI->connect("dbi:mysql:database1", "user", "pwd") or choke("Can't
connect to db: $DBI::errstr");
$sth = $dbh->prepare("select * from Table1") or choke("Can't prepare
statement: ",$dbh->errstr);
$rv = $sth->execute;
while (($some_stuff) = $sth->fetchrow_array) {
$sth = $dbh->prepare("select * from Table2") or choke("Can't prepare
statement: ",$dbh->errstr);
$rv = $sth->execute;
while (($some_more_stuff) = $sth->fetchrow_array) {
print "blah blah blah\n";
}#end inner while
}#end outer while
$dbh->disconnect;
I've tried running this and it seems to run the outer loop ok, but after the
first record of the inner loop gets returned, it stops and dies. If there's
a better (or proper) way to do something like this I'd love to know how.
Thanks,
Jason
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