Richard Lynch wrote:
I have this process that dumps out database records to static HTML pages.
The basic algorithm goes like:
//Set any un-parented item (a root in the thread) to be its own parent:
update entry set original_id = entry_id where original_id is null
in the following you are looking for dirty flagged rows, were they set
to dirty before or after your previous statement?
//collect any "dirty" entries (changed in db, need to re-publish)
$dirty = select entry_id from entry where dirty = 1
while (list($entry_id) = mysql_fetch_row($dirty)){
//find the whole thread:
$followups = select entry_id, X, Y from entry where original_id =
$dirty_id
are you really meaning to use $dirty_id, or did you mean to use
$entry_id??? $dirty_id doesn't exist as far as I can tell. unless it
is something that was set before all this.
//there is an ORDER BY which is not relevant
Personally, I would do some check right here to see if the result set
has at least one row at this point and then issue a continue; if
mysql_num_rows() returns 0. That way you won't get empty h? tags
floating around.
//get some thread metadata from the first row's X field
list($junk, $X) = mysql_fetch_row($followups);
//$X is the same for all rows...
echo "<h1>$X</h1>\n";
I would check your HTML output for empty <h1></h1> tags, this would tell
you that it didn't find anything :(
Hope this helps
Jim Lucas
//reset to row 0
mysql_data_seek($followups, 0);
while (list($entry_id, $X, $Y) = mysql_fetch_row($followups)){
echo "<p>$Y</p>\n";
}
}
So, how come *SOMETIMES*, seemingly at random, I get:
Warning: mysql_data_seek(): Offset 0 is invalid for MySQL result index
116 (or the
query data is unbuffered) in
/www/acousticdemo.com/web/complaints/publish.cron on
line 26
Line 26 is, obviously, the mysql_data_seek call above...
I do not *THINK* there is any other process anywhere deleting rows
from the table -- it should be an ever-growing table...
So is the query data being unbuffered out from under me due to some
my.cnf setting?...
Or am I just plain wrong, and *something* is deleting from the entry
table?
I Googled for the error message, and found about a 26,000 web sites
that are exhibiting this error, rather than the folks discussing this
error. :-v
The few I was able to weed out were obvious logic errors, which I
don't think I have.
I've read the mysql_unbuffered_query on php.net and think I understand
it in respect to mysql_query et al.
I guess I'm looking for reassurance that it's definitely my mistake
somewhere in the mess I've made, and that I'm looking for a delete
query, and it's not a subtle bug or feature I'm failing to understand.
:-)
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