Edit report at https://bugs.php.net/bug.php?id=65693&edit=1
ID: 65693
Comment by: ken-phpbugs at norganna dot com
Reported by: ken-phpbugs at norganna dot com
Summary: mssql_fetch_batch does not fetch next batch
Status: Open
Type: Bug
Package: MSSQL related
Operating System: Linux
PHP Version: 5.5.3
Block user comment: N
Private report: N
New Comment:
Actually, the patch I provided does not help if you are running multiple
queries.
It seems that the dbcancel() for any query on the link cancels all queries on
the
link, so that if another query decides to free a result, your completely
separate
batch result is nuked at the same time.
The only way I can work out to make it multi-query safe is to comment out the
dbcancel() line altogether.
Previous Comments:
------------------------------------------------------------------------
[2013-09-18 05:47:05] ken-phpbugs at norganna dot com
I made a minor copy/paste fail with the test script:
$remain = mssql_fetch_batch($res);
$res should be $result.
Bug is still valid.
------------------------------------------------------------------------
[2013-09-18 05:09:20] ken-phpbugs at norganna dot com
Description:
------------
When sending batch requests to the mssql server, the mssql result is having
dbcancel() called prematurely on the handle (via the _free_mssql_result
function).
Because we are processing batches of the result set we need the query to stay
open
until we are finished fetching all the rows (not just the first batch).
In a non-batch scenario, it is fine to cancel the query after the first batch
is
called, because all rows have been fetched.
I have attached a patch, which "fixes" the problem, but probably not in the
right
way. I have no clue what the right way actually would be or what the
repercussions
of applying the patch are. It is meant for illustrative purposes only.
Test script:
---------------
<?php
// Connect to MSSQL and select the database
$link = mssql_connect('hostpath', 'user', 'pass');
mssql_select_db('db', $link);
// Send a query to a table that has 12 rows
print "Given a table with 12 rows:\n";
$result = mssql_query('SELECT * FROM tablename', $link, 5);
do {
while ($row = mssql_fetch_assoc($result)) {
print "Row found\n";
}
$remain = mssql_fetch_batch($res);
print "Remainder $remain\n";
} while ($remain > 0);
Expected result:
----------------
Given a table with 12 rows:
Row found
Row found
Row found
Row found
Row found
Remainder 5
Row found
Row found
Row found
Row found
Row found
Remainder 2
Row found
Row found
Remainder 0
Actual result:
--------------
Given a table with 12 rows:
Row found
Row found
Row found
Row found
Row found
Remainder 1
Row found
Remainder 0
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Edit this bug report at https://bugs.php.net/bug.php?id=65693&edit=1
