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Bug #26820 mssql_fetch_row BIT field problem
Submitted: 2004-01-06 15:56 UTC Modified: 2005-11-18 19:58 UTC
Avg. Score:3.7 ± 0.9
Reproduced:8 of 9 (88.9%)
Same Version:2 (25.0%)
Same OS:2 (25.0%)
From: subspace at wanadoo dot nl Assigned: fmk (profile)
Status: Closed Package: MSSQL related
PHP Version: 4CVS-2004-02-06 OS: Debian Linux 2.4.21
Private report: No CVE-ID: None
 [2004-01-06 15:56 UTC] subspace at wanadoo dot nl
Fields that have the SQL type 'bit' and are nullable return string(1) "0" for both 0 (false) and NULL values, when using mssql_fetch_row and similar.

Expected behavior would be to return bool(false) for NULL values.

Reproduce code:
function vdump($value) {
	$result = ob_get_contents();
	return trim($result);

$db = mssql_connect('servername', 'username', 'password');
mssql_query("CREATE TABLE #demo (bitfield BIT NULL, tinyfield TINYINT NULL)", $db);
mssql_query("INSERT INTO #demo (bitfield,tinyfield) VALUES (0, 0)", $db);
mssql_query("INSERT INTO #demo (bitfield,tinyfield) VALUES (1, 1)", $db);
mssql_query("INSERT INTO #demo (bitfield,tinyfield) VALUES (NULL, NULL)", $db);

$result = mssql_query("SELECT * FROM #demo", $db);
while ($row = mssql_fetch_row($result))
	echo "bit: " . vdump($row[0]) . "\t tiny: " . vdump($row[1]) . "\n";

mssql_query("DROP TABLE #demo", $db);

Expected result:
bit: string(1) "0"	 tiny: string(1) "0"
bit: string(1) "1"	 tiny: string(1) "1"
bit: bool(false)	 tiny: bool(false)

Actual result:
bit: string(1) "0"	 tiny: string(1) "0"
bit: string(1) "1"	 tiny: string(1) "1"
bit: string(1) "0"	 tiny: bool(false)


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 [2004-01-19 01:03 UTC] subspace at wanadoo dot nl
Accidentally clicked hit Submit before I was done typing..
Using 4.3.5RC2-dev CVS 200401190430 and Debian package freetds-dev 0.61-5 the result is now:

X-Powered-By: PHP/4.3.5RC2-dev
bit: int(0)      tiny: int(0)
bit: int(1)      tiny: int(1)
bit: int(0)      tiny: NULL

All the strings are now ints, but as you can see the expected NULL value is still not there.
 [2004-01-19 12:21 UTC]
Just to clarify: Expected behaviour is that return values are NULL for NULL. (definately NOT bool(false) like you suggested in your first comment)

 [2004-02-06 11:35 UTC]
One more information is needed: what was the configure line used to configure PHP?

 [2004-02-06 13:44 UTC] subspace at wanadoo dot nl
./configure --with-mssql --without-mysql
The mysql option is irrelevant though. 
FreeTDS package installed: freetds-dev    0.61-5

X-Powered-By: PHP/4.3.5RC2

bit: int(0)      tiny: int(0)
bit: int(1)      tiny: int(1)
bit: int(0)      tiny: NULL
 [2004-02-21 05:45 UTC] egarcia at egm dot as
I have the same problem in Windows XP, Windows 2000, using MSSQL 2000.

I call a store procedure that returns data using rollup over a bit field.  In the sumarized data MSSQL return NULL in the bit field but PHP give me a zero (0).

The expected result is to get the NULL value data.

The example in the posted message is TOTALLY replicable in my system.
 [2004-02-25 14:53 UTC]
On Win32 this is caused by a bug in dblib (the Microsoft library used to build the extension).
 [2004-10-18 20:39 UTC] freddyz77 at tin dot it
dblib use by default TDS protocol 4.2. This protocol do not support null bits so it return 0 instead. Use protocol 7.0 or more (8.0 for mssql2k). This can be configured using FreeTDS (but not using MS dblib).
 [2005-11-18 19:58 UTC]
This problem has been fixed in FreeTDS. Works on both Windows and Linux.
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