Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Re: DBI Invalid Cursor State when PRINT statements are embedded in SQL

by JamesNC (Chaplain)
on Oct 19, 2004 at 17:29 UTC ( #400600=note: print w/ replies, xml ) Need Help??


in reply to DBI Invalid Cursor State when PRINT statements are embedded in SQL

Here is the Solution:
Martin Evans on the dbi-user mailing list was able to finally find the source of this error, here is the text of his reply:

I analysed your log and did the same thing in ODBCTest which used to come with MDAC and it fails in the same way: SQLPrepare(print 's' select count(*) from table print 'e') SQLNumResultCols() returns SQL_ERROR and invalid cursor state. so, I'm afraid, there is no bug in DBD::ODBC and the problem is in the MS SQL Server driver. Interestingly, our ODBC-ODBC Bridge makes you code almost work because it inserts a call to SQLNumParams between the SQLPrepare and the SQLNumResultCols and that puts the MS SQL Server Driver into a different state. I say "almost" because it does appear to hightlight another bug in the MS SQL Server driver later on where SQLMoreResults returns SQL_NO_DATA but a later call to SQLNumResultCols returns 1 column and this persuades DBD::ODBC there is a column and it fails on a call to SQLDescribeCol (because SQLNumResultCols lied and there is no result-set). Your only choice is to take the prints out.

I ended up building DBI 1.45 and DBD::ODBC 1.11 on my machine.
I was still able to achieve the desired result by using a suggestion our DBA made of substituting a SELECT everywhere there is a PRINT and that seems to work nicely. For statements that return multiple result sets I ended up using the following:

#!C:/perl/bin/perl -w #DBI 1.45 #DBD::ODBC 1.11 use DBI; $dbh = DBI->connect("dbi:ODBC:tmpDB", 'username','password', { PrintError => 1, RaiseError =>0, LongReadLen => 65536, odbc_async_exec => 1, odbc_err_handler => \&errSub } ); $command = qq/ select 'start' select name = 'dbi-user' select 'end' /; $sth = $dbh->prepare($command); die $DBI::errstr unless $sth; my $rc = $sth->execute(); do { my @row; while (@row = $sth->fetchrow_array()) { print join(",", @row), "\n"; } } while ($sth->{odbc_more_results}); $dbh->disconnect; sub errSub { my ($state, $msg) = @_; # Strip out all of the driver ID stuff $msg =~ s/^(\[[\w\s]*\])+//; my $err_text .= $msg."\n"; print "Err($state):",$err_text; }
Thanks to all who responded.

JamesNC


Comment on Re: DBI Invalid Cursor State when PRINT statements are embedded in SQL
Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://400600]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (12)
As of 2015-07-06 16:23 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (77 votes), past polls