Martin, Autocommit off doesn't help local temps persist after the
execute.
Andon said that batching all the commands in the same execute is not an
option for him, so the only working alternative so far is to consider
global temps (##foo). They do persist after an execute and throughout
an entire session.
Consider these examples:
my $s1 = 'create table #foo (a int not null)';
my $s2 = 'insert into #foo values (1)';
my $s3 = 'select * from #foo';
$dbh->{AutoCommit} = 0; # trying to see if this help, but it
doesn't
my $sth;
$sth = $dbh->prepare($s1);
$sth->execute(); # works: table created
$sth = $dbh->prepare($s1);
$sth->execute(); # works: can recreate table because
original is gone
$sth = $dbh->prepare($s2);
$sth->execute(); # doesn't work: table is gone
$sth = $dbh->prepare($s3);
$sth->execute(); # doesn't work: table is gone
$sth = $dbh->prepare("$s1; $s2; $s3");
$sth->execute(); # works: table exists across batched
commands
-----Original Message-----
From: Martin Evans [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 10, 2007 7:39 AM
To: dbi-users@perl.org
Subject: Re: temporary table "disapears"
CAMPBELL, BRIAN D (BRIAN) wrote:
> You're right. It's the the other way around from what I said.
> However, when I tested this yesterday it seemed I was getting an error
> on the create command also. But I re-examined the results more
> carefully today and the create worked OK; it was just the insert that
> failed. However they were both run on the same connection (same $dbh
> handle). So it seems that local temps don't persist after an
> execute() call, as Andon supposed.
>
What if you turn autocommit off - do the temporary tables exist for
longer then?
Martin
--
Martin J. Evans
Easysoft Limited
http://www.easysoft.com
> ________________________________
>
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, May 09, 2007 10:49 PM
> To: CAMPBELL, BRIAN D (BRIAN)
> Cc: [EMAIL PROTECTED]; dbi-users@perl.org
> Subject: RE: temporary table "disapears"
>
>
>
> I'm pretty sure that #tmp is a local temporary table, and ##tmp
is a
> global temporary table...
>
> So the original problem is most likely that the create table
#tmp and
> the insert into #tmp statements aren't being run on the same physical
> connection. I don't know DBD::ODBC, but I can tell you that
> DBD::Sybase could possibly have opened a second connection under the
> covers if it thought the first statement hadn't been completely
> processed yet.
>
> Michael
>
>
>
>
>
> Extranet
> [EMAIL PROTECTED] - 09.05.2007 18:40
>
>
> To: atschauschev, dbi-users
>
> cc:
>
> Subject: RE: temporary table "disapears"
>
> Actually I tried this against SQL 2000, DBI 1.53 and DBD::ODBC
> 1.13...
>
> You should be getting 2 errors, the same error from both
prepares.
> In
> other words, #foo isn't being treated as a proper table name.
> Naturally, these statements work fine if you just use foo (which
> isn't
> temp).
>
> However, #foo should represent a "global temp" table, and this
is not
> being accepted as a valid name. Not sure why.
>
> But ##foo works fine, and the table does persist across executes
> while
> the $dbh connection is open. With 2 #'s, it's a "local temp"
> table
> which means it's not visible to other sessions. If that's OK,
> perhaps
> you can use that instead.
>
>
>
> -----Original Message-----
> From: Andon Tschauschev [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, May 09, 2007 8:31 AM
> To: dbi-users@perl.org
> Subject: temporary table "disapears"
>
> Hello,
>
> I am using DBI 1.51 and DBD::ODBC 1.13, connecting to MSSQL2005.
>
> Executing following statements:
> $sth = $dbh->prepare('create table #foo (a int not null)');
> $sth->execute(); $sth = $dbh->prepare('insert into #foo values
(1)');
> $sth->execute();
>
> generate an error:
> [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid object
name
> '#foo'.
>
> So, the temporary table "disapears".... (I tested it on Sybase,
using
> DBD::Sybase, too, there is no an error). Since the two
statements are
> dynamically created (between come other statements), I cannot
execute
> in
> one batch $sth = $dbh->prepare('create table #foo (a int not
> null)
> insert into #foo values (1)); $sth->execute();
>
> at once...
>
> How can I avoid this problem?
>
> Regards!
>
> Andon
>
>
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