ID: 27156
Updated by: [EMAIL PROTECTED]
Reported By: sanjok at pict dot lviv dot ua
-Status: Open
+Status: Assigned
Bug Type: OCI8 related
-Operating System: Linux SuSE 7.3&8.1;SLES9
+Operating System: *
-PHP Version: 4.3.4;4.3.10;4.3.11
+PHP Version: 5CVS, 4CVS (2005-08-12)
Assigned To: tony2001
Previous Comments:
------------------------------------------------------------------------
[2005-08-12 09:07:16] max at pict dot lviv dot ua
I have digged deeper into this problem and it seems that I have found a
solution, or at least a workaround for this problem. The reason for the
problem is that Oracle driver raises error 1406 ("fetched column value
was truncated") while the value is not really truncated, and this
situation is handled incorrectly by oci8 module (what I don't
understand is why SQLPlus, which uses same libs, doesn't raise this
error...). However, this solution requires changes in PHP source code
(oci8.c module), so this must be done by one of PHP developers.
So the solution looks this way:
In "ext/oci8/oci8.c" module there's a function "_oci_make_zval". In
this function there's following piece of code:
------------------------
switch (column->retcode) {
case 0:
/* intact value */
if (column->piecewise) {
size = column->retlen4;
} else {
size = column->retlen;
}
break;
default:
/* XXX we SHOULD maybe have a different behaviour for
unknown results! */
ZVAL_FALSE(value);
return 0;
}
------------------------
As far as I understand, here we set size of return string in case
execution completed successfully or return FALSE in other cases (like
in this case of this bug). However, in case of error 1406 we have
normal return, but it's set to false because retcode is not 0. If we
modify this piece of code this way:
------------------------
switch (column->retcode) {
case 1406:
/*Protection from invalid behaviour*/
size = column->retlen;
case 0:
/* intact value */
if (column->piecewise) {
size = column->retlen4;
} else {
size = column->retlen;
}
break;
default:
/* XXX we SHOULD maybe have a different behaviour for
unknown results! */
ZVAL_FALSE(value);
return 0;
}
------------------------
everying start to work fine.
It's a DIRTY solution, although it closes the bug, but it would be nice
to investigate the source of this error -- why error 1406 is raised
here. If this is a bug in Oracle, than this approach can be a
workaround for this bug.
------------------------------------------------------------------------
[2005-08-11 14:27:24] max at pict dot lviv dot ua
One more investigation:
If I simply convert column from char to varchar2 using ALTER TABLE
statement, it doesn't help. OCIFetchInto behaves correctly only if
table was created with varchar2 type. But even with varchar2 column, if
I fill entire column with umlauts, OCIFetchInto and OCIFetch fail.
Sample:
SQL> desc test;
Name Null? Typ
----------------------------------------- --------
----------------------------
NAME VARCHAR2(10)
SQL> select name, length(name) from test order by name;
NAME LENGTH(NAME)
------------------------------ ------------
ü 1
üü 2
üüüüü 5
üüüüüü 6
üüüüüüüüüü 10
--So you see that Oracle shows length correctly.
Now I use the following php script:
ociinternaldebug(true);
$connection = OCILogon("????", "????", "????");
$query = "SELECT * FROM TEST order by name";
$statement = OCIParse ($connection, $query);
OCIExecute($statement);
while (OCIFetchInto ($statement, $row, OCI_ASSOC+OCI_RETURN_NULLS))
{
var_dump($row);
}
OCIExecute($statement);
while(OCIFetch($statement)) {
var_dump (OCIResult($statement, "NAME"));
}
And here's result of ociinternaldebug:
OCIDebug: _oci_open_server new conn=0 dname=????<br />
OCIDebug: _oci_open_session new sess=5 user=????<br />
OCIDebug: oci_do_connect: id=6<br />
OCIDebug: oci_parse "SELECT * FROM TEST order by name" id=7 conn=6<br
/>
array(1) {
["NAME"]=>
string(2) "ü"
}
array(1) {
["NAME"]=>
string(4) "üü"
}
array(1) {
["NAME"]=>
string(10) "üüüüü"
}
OCIDebug: _oci_make_zval: NAME,retlen = 10,retlen4 =
0,storage_size4 = 11,indicator 6, retcode = 1406<br />
array(1) {
["NAME"]=>
bool(false)
}
OCIDebug: _oci_make_zval: NAME,retlen = 10,retlen4 =
0,storage_size4 = 11,indicator 10, retcode = 1406<br />
array(1) {
["NAME"]=>
bool(false)
}
string(2) "ü"
string(4) "üü"
string(10) "üüüüü"
OCIDebug: _oci_make_zval: NAME,retlen = 10,retlen4 =
0,storage_size4 = 11,indicator 6, retcode = 1406<br />
bool(false)
OCIDebug: _oci_make_zval: NAME,retlen = 10,retlen4 =
0,storage_size4 = 11,indicator 10, retcode = 1406<br />
bool(false)
OCIDebug: START php_rshutdown_oci<br />
OCIDebug: END php_rshutdown_oci<br />
OCIDebug: START _oci_stmt_list_dtor: id=7 last_query="SELECT * FROM
TEST order by name"<br />
OCIDebug: START _oci_column_hash_dtor: NAME<br />
OCIDebug: END _oci_column_hash_dtor: NAME<br />
OCIDebug: START _oci_conn_list_dtor: id=6<br />
OCIDebug: nothing to do..<br />
OCIDebug: END _oci_conn_list_dtor: id=6<br />
OCIDebug: END _oci_stmt_list_dtor: id=7<br />
OCIDebug: START _oci_close_session: logging-off sess=5<br />
OCIDebug: START _oci_close_server: detaching conn=4 dbname=????<br />
OCIDebug: START php_mshutdown_oci<br />
OCIDebug: END php_mshutdown_oci<br />
-------------
Some thoughts on this error:
Combination of OCIFetch+OCIResult has the same problem.
The error occurs when length of column value in bytes exceeds length of
column defined in oracle + 1 byte. Length of column value differs from
length of field for multi-byte encodings like UTF8, so probably there's
an error with memory allocation (it's just a guess).
And P.S.: By the way, when I change environment variable NLS_LANG to
GERMAN_AUSTRIA.WE8DEC, everything's selected fine!
------------------------------------------------------------------------
[2005-08-11 12:40:21] max at pict dot lviv dot ua
We have this problem on multiple configurations, everywhere situation
is the same.
Case1:
DB Server Compaq Tru64Unix + Oracle 10.1.0.3.0
Client machines:
A. SuSE 7.3 + Oracle Client 9.0.1
B. SLES 9 + Oracle Instant Client 10
Case2:
DB Server SuSE 8.1 + Oracle 9.0.1
Oracle Client 9.0.1 running on the same machine.
We have tried PHP 4.3.10 and 4.3.11, and this doesn't change the
situation, problem persists.
In SQLPlus I see data correctly saved from a web application, but when
using OCIFetchInto in PHP script I receive FALSE instead of column
value when column contains more than one umlaut character.
Some details:
NLS_LANG = GERMAN_AUSTRIA.UTF8;
Database encoding is WE8DEC.
------------------------------------------------------------------------
[2005-04-02 01:00:04] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
------------------------------------------------------------------------
[2005-03-25 01:42:42] [EMAIL PROTECTED]
Please try using this CVS snapshot:
http://snaps.php.net/php4-STABLE-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php4-win32-STABLE-latest.zip
------------------------------------------------------------------------
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