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Re: Hungry PHP

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  • From: "Paul Schaap" <Paul.Schaap AT dingoblue.com.au>
  • To: freetds
  • Subject: Re: Hungry PHP
  • Date: Sat, 11 Sep 1999 20:58:29

Brian,

On 09/11/99, "Brian Bruns <camber AT umcc.ais.org>" wrote:
> Netscape browser by chance? Have you tried it under IE or lynx by chance

I'm embarassed to say I dreamt I should have tried those last night, please
forgive me ! Unfortunately my machine at home is largely a M$ free zone,
and my Linux side will dial into everything but work so I'll double check
tomorrow at work.

> and did it work there? If so check the PHP FAQ, you have a null trailing
> 'Schaap' after which netscape kindly discards everthing (until a newline?)

This is kinda what I thought may be going on !
More and more I'm finding Netscape less appealing for many such reasons
...

> Anyway, I'm going to guess the real problem is varchar handling in
> FreeTDS. Sybase's libs track the length of varchars in a structure
> something like:
>
> struct _cs_varchar {
> CS_CHAR array[CS_MAX_STRING];
> CS_INT length;
> } CS_VARCHAR
>
> and then the dblib structure is #define'd to this
>
> (This is off the top of my head, I don't remember exactly what the ctlib
> structure looks like, but close enough for this discussion). FreeTDS
> doesn't track the length as such, it just always null terms. So there are
> (under dblib) two basic ways to bind a string NTBSTRINGBIND (null term'd)
> and STRINGBIND. I believe what is happening is one of the cases is
> putting a null where it is not supposed to. It basically doesn't
> have enough information to do the right thing.
>
> So the short story is probably varchar has to be fixed, and that's going
> to break alot of things. PHP probably stopped working because of changes
> that were put to fix DBD::Sybase's behaviour.

Ouch !

>
> So, anybody mind if I really screw up things for a few days?

What have I started .... :-0

>
> brian
>
> On Sat, 11 Sep 1999, Paul Schaap wrote:
>
> > Brian,
> >
> > Following on from my previous MS SQL post here is some further details on
> > the odd behaviour under php. Please note that under sqsh there is no
> > problem.
> >
> > Here is a phtml
> > ############################################################################
> > <HTML>
> > <HEAD>
> > <TITLE>freetds kicks butt</TITLE>
> > </HEAD>
> > <BODY>
> > <CENTER><H1><U>Hungry PHP</U></H1></CENTER>
> > <?
> > $cnn = sybase_pconnect("Your MS SQL Server","Login","Password")
> > or die("Connect");
> > $db = sybase_select_db("A Database",$cnn)
> > or die("Select");
> >
> > // Surname is a VARCHAR
> > $sql = "SELECT ID, Surname, ID
> > FROM Customer
> > WHERE ID = 10000696";
> > echo "$sql<BR>";
> > $qry = sybase_query($sql);
> > if($qry){
> > list($i1,$i2,$i3) = sybase_fetch_row($qry);
> > echo "$i1 $i2 eat me $i3<BR>\n";
> > echo "$i1 $i2 <B> eat me $i3</B><BR>\n";
> > }
> > sybase_free_result($qry);
> >
> > // WITH A CONVERT
> > $sql = "SELECT ID, CONVERT(CHAR(20),Surname), ID
> > FROM Customer
> > WHERE ID = 10000696";
> > echo "$sql<BR>";
> > $qry = sybase_query($sql);
> > if($qry){
> > list($i1,$i2,$i3) = sybase_fetch_row($qry);
> > echo "$i1 $i2 eat me $i3<BR>\n";
> > echo "$i1 $i2 <B> eat me $i3</B><BR>\n";
> > }
> > sybase_free_result($qry);
> > ?>
> > </BODY>
> > </HTML>
> > ############################################################################
> >
> > Heres a possible schema, I'm not 100% on the MS SQL DB syntax ...
> > ############################################################################
> > CREATE TABLE Customer (
> > ID INTEGER,
> > Surname VARCHAR(255)
> > );
> > ############################################################################
> >
> > Heres the output on the Browser
> > ############################################################################
> > Hungry PHP
> >
> > SELECT ID, Surname, ID FROM Customer WHERE ID = 10000696
> > 10000696 Schaap
> > 10000696 Schaap eat me 10000696
> > SELECT ID, CONVERT(CHAR(20),Surname), ID FROM Customer WHERE ID = 10000696
> > 10000696 Schaap eat me 10000696
> > 10000696 Schaap eat me 10000696
> > ############################################################################
> > notice the first 'eat me 10000696' on the first query just doesnt turn up.
> > But the second one does turn up ? The tag entered on the second one
> > somehow
> > saves the data from dissappearing. A view source on the page also doesnt
> > reveal the missing info hidden in a tag or anything, it just vanished !
> >
> > In the second query when I CONVERT all is well and as expected.
> >
> > REGARDS
> > Paul
> >

REGARDS
Paul


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