[freetds] Freetds PHP problem
Lowden, James K
LowdenJK at bernstein.com
Wed Sep 8 15:37:09 EDT 2004
> From: Kelley, Peter
> Sent: Wednesday, September 08, 2004 1:39 PM
> I recently built a new server (RedHat ES 3.0) upgrading Freetds from
> version 0.61.2 to version 0.62.4. I'm using Freetds with PHP, and the
> PHP version remains the same at 4.3.4.
> After upgrading, accessing MSSQL Server from PHP, the connection
> settings changed. Specifically ansi_nulls and ansi_warnings were no
> longer set.
> Checking connection settings:
> DBCC USEROPTIONS
> FROM PHP 4.3.4/Freetds 0.62.4 ansi_nulls and ansi_warnings NOT set
> FROM PHP 4.3.4/Freetds 0.61.2 ansi_nulls and ansi_warnings set
> FROM tsql, Freetds 0.62.4 ansi_nulls and ansi_warnings set
> FROM tsqsl, Freetds 0.61.2 ansi_nulls and ansi_warnings set
You did everything right. It's an implementation change. See the
ChangeLog entry for Tue Jun 24 16:58:35 EDT 2003.
The 7.0 login packet contains a bit telling the server whether or not
the client is an ODBC driver. If set, the server reacts by enabling its
ODBC default settings, among which are ansi_nulls and ansi_warnings.
db-lib connections, including PHP using the mssql extension, get
different defaults that match Sybase's original choices.
Prior to my change, a db-lib connection (incorrectly) would set the ODBC
bit, leading to behavior inconsistent with the vendors' db-lib
I'm sorry this change wasn't made clear in the README. While it's a
move in the direction of greater compatibility, it's also inconsistent
with prior versions, in a subtle way that could easily introduce errors.
It should have been highlighted.
> Is there a way to change the connection settings in PHP or
> freetds? (I know I can set them on the server)?
I don't know. If not, you might consider undoing the change in login.c,
bearing in mind that db-lib applications typically assume
non-ANSI-compliant NULL handling, and maybe reminding your SQL folks to
be wary of assumptions about ANSI compliance. (If you have any fans of
ISQL.EXE -- a db-lib app -- in your shop, relying on default setttings
is apt to bite sooner or later.) But this patch should do the trick:
--- src/tds/login.c 24 Jun 2003 21:07:14 -0000 1.101
+++ src/tds/login.c 10 Jun 2003 07:22:24 -0000 1.100
@@ -748,6 +748,9 @@
option_flag2 |= 0x80; /* enable domain login security
+ option_flag2 |= 0x02; /* client is an ODBC driver
+ option_flag2 |= 0x01; /* change to initial language must
(Of course, I'm not going to undo the change in CVS.)
Hope that helps.
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