Re: failing row[] assignment

From: Jeff Huston <hustonfamily(at)hotmail.com>
Date: Wed Aug 01 2007 - 18:50:34 EDT

I'm sure it's been said many times before... "it ran under 2.1.1 with no problem!" :o)

Yeah, the destination is a std::string. In which case the cast is required is it not?... given the ambiguous nature of row[].

Again, just hoping something might jump out at someone... as I'm not particularly experienced with mysql++ use. I'll keep digging.

>From: "Drew M." <ghasatta@gmail.com>
>To: "Jeff Huston" <hustonfamily@hotmail.com>
>CC: plusplus@lists.mysql.com
>Subject: Re: failing row[] assignment
>Date: Wed, 1 Aug 2007 12:54:57 -0700
>
>If the examples run without issue, I would start by going over your own
>code
>first. What's the type for temp->state?
>
>Is it a pointer or a std::string? If it's a string, what happens if
>you get rid of the cast to (const char *) on the assignment?
>
>
>On 8/1/07, Jeff Huston <hustonfamily@hotmail.com> wrote:
> >
> > Dumb developer again... anyone see anything wrong here?
> >
> > .
> > .
> > mysqlpp::Query query = con.query();
> >
> > std::string select = build_query(in);
> >
> > mysqlpp::Result result;
> > mysqlpp::Row row;
> >
> > result = query.store();
> >
> > if(result)
> > {
> > while (row = result.fetch_row())
> > {
> > a__record *temp = new a__record();
> >
> > temp->state = (const char *)row["state"];
> > .
> > .
> >
> >
> > This is a CGI app... it's failing (error_log msg below) following the
> > temp->state assignment there (or any other temp->? = row[?] assignment
> > that
> > follows)...
> >
> > [Wed Aug 01 12:11:40 2007] [error] [client 127.0.0.1] *** glibc detected
> > ***
> > /abi/live/phase4/httpd/cgi-bin/polkStreetSearch: free(): invalid
>pointer:
> > 0x0000000000634fa8 ***
> >
> > ...although I can examine row["state"] immediately prior to the
>assignment
> >
> > and see good data. I can also assign a literal to temp->state and it
> > works
> > fine.
> >
> > Anyway... if there's anything jumping out here... I'd appreciate any
> > advice.
> > Aside from this, everything seems to be working fine.
> >
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Received on Wed Aug 1 18:51:00 2007