[PHP-DB] multiple query deletion in mysql
hey i have many records in my database and i want delete many records with checkbox form .I did many ways but no success. please help -- laskkkassana
Re: [PHP-DB] Optimizing Query
Arie Nugraha napsal(a): Hi list, I Have a problem with my query that fetch about 22.000 records from database, the query is like this : SELECT SQL_CALC_FOUND_ROWS DISTINCT b.biblio_id, b.title, a.author_name FROMbiblio AS b LEFT JOIN biblio_author AS ba ON b.biblio_id=ba.biblio_id LEFT JOIN mst_author AS a ON ba.author_id=a.author_id WHERE b.biblio_id IS NOT NULL GROUP BY b.biblio_id ORDER BY b.input_date DESC LIMIT 0, 10 it took about 6 seconds to complete the query in localhost. I already make an Indexes on each table, but still the performance is slow. Anyone have an idea how to optimize the query so result is faster? Thx optimalisation requests should be supplied with result of explain and table structure. Without that it is just guessing what may went wrong. OKi98 -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] sortable list w/php ajax
Anyone modify the scripts at
http://www.phpriot.com/d/articles/client-side/sortable-lists-with-php-and-ajax/index.html?
I'm just looking to include more fields in the listing and possibly in
tables. An option to move one at a time to the top of the list by
clicking a button on each line would be nice. I've got the script to
work, just not with multiple fields and the other additions.
The parts that would probably need the changes are:
$books = array();
while ($row = mysql_fetch_object($result)) {
$books[$row-tablekey] = $row-title;
}
return $books;
---
(builds the array) and
---
ul id=books_list class=sortable-list
? foreach ($books as $tablekey = $title) { ?
li id=book_?= $tablekey ??= $title ?/li
? } ?
/ul
---
lists the fields out
I'd really like to change out the list with a table...
Thanks...
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Re: [PHP-DB] connection id mystery
Charles Whitaker wrote: Since I'm requesting persistent connections, why don't I get the same connection each time? Or, to ask it another way: I notice that the number of threads slowly increases as I continue to access records -- why would this happen if I'm using persistent connections? I assumed that the first time I did 'new PDO' I'd create a connection, and each time after that I'd get the same connection. At least that's how I read the documentation. Using persistant connections simply means that you will be given a connection from a pool of open connections rather than creating a new one each time. There is no guarantee you'll get the same connection from request to request. Can anyone point me in the right direction? Thanks. I would suggest you add another field to the table you are trying to lock. Put an ID in there that you can pass from request to request. Use the locking feature to lock the table, read that value for a record, if it's not set to something write your ID to it then unlock it. If it does already contain an ID you treat it as locked. you just need to make sure you unlock the row when you're done (probably by setting that value to NULL. If you're already using sessions I would strongly recommend using the session ID as the lock ID. If not you can easily generate one but you'll need to pass it manually from request to request. That may not be as clean as a pure SQL solution, but it will work. You may also want to add a timestamp row to allow for a timeout on the lock. -Stut -- http://stut.net/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] multiple query deletion in mysql
lameck kassana wrote: hey i have many records in my database and i want delete many records with checkbox form .I did many ways but no success. I've used this technique many times and it works fine. Are you getting the checkbox values to come through your form properly? Are you having problems with the delete query? -- Postgresql php tutorials http://www.designmagick.com/ -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP-DB] connection id mystery
Greetings,
I'm developing a tech support log using php and MySQL. Users will
add, delete and modify records. In fact, it's fully implemented
except for concurrency control. I'm trying to use get_lock and
release_lock to implement record-level locking, but when I go to
release the lock, the connection id doesn't match the id used to get
the lock, and so the release fails and the record stays, in effect,
locked.
When a user loads the edit page for a record, get_lock is called with
a unique id before the record is read. When the user saves changes,
the edit page is reloaded, and the record is modified. The lock is
released only after the user loads some other page.
It often works, but sometimes I see this in the log:
[25/Jul/2007:11:33:39] 192.168.2.102 InitSQL: new connection: pdo
client id = 279 // load the edit page, and ...
[25/Jul/2007:11:33:39] 192.168.2.102 Lock iss_23 gotten using
connection id 279 // lock the record.
[25/Jul/2007:11:33:42] 192.168.2.102 InitSQL: new connection: pdo
client id = 288 // load some other page, but get a different
connection id, and so ...
[25/Jul/2007:11:33:42] 192.168.2.102 Lock iss_23 was not gotten using
current connection id (288), not released // fail to
unlock the record.
Since I'm requesting persistent connections, why don't I get the same
connection each time? Or, to ask it another way: I notice that the
number of threads slowly increases as I continue to access records --
why would this happen if I'm using persistent connections? I assumed
that the first time I did 'new PDO' I'd create a connection, and each
time after that I'd get the same connection. At least that's how I
read the documentation.
Can anyone point me in the right direction? Thanks.
The gory details:
At the beginning of every page is a call to a function with this code:
$gSQL = new
PDO('mysql:unix_socket=/tmp/mysql.sock;dbname=operations',
$_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW'],
array(PDO::ATTR_PERSISTENT = true, PDO::ATTR_ERRMODE =
PDO::ERRMODE_EXCEPTION, PDO::ATTR_TIMEOUT = 86400));
// get connection id
$stmt = $sql-query('show processlist');
$therow = $stmt-fetch();
$pdoclientid = $therow['Id'];
elog('InitSQL: new connection: pdo client id = ' . $pdoclientid);
In the edit page I call to a function that does this:
// get the current connection id
$stmt = $gSQL-query('select connection_id()');
$therow = $stmt-fetch();
$connectionid = $therow[0];
// get the lock
$thelock = 'iss_' . $issueid;
foreach ($gSQL-query(select get_lock(' . $thelock . ', . 1 .
)) as $row) {
// check the result
$result = $row[0];
switch ($result) {
case 1:
eLog(Lock . $thelock . ' gotten using connection
id ' . $connectionid);
return true;
break;
case 0:
eLog(Getting lock . $thelock . ' timed out');
return false;
break;
case NULL:
eLog(Error getting lock . $thelock);
return false;
break;
default:
return false;
break;
}
}
On all other pages, I try to release the lock with this code:
// get the current connection id
$stmt = $gSQL-query('select connection_id()');
$therow = $stmt-fetch();
$connectionid = $therow[0];
// try to release the lock
foreach ($gSQL-query(select release_lock(' . $thelock . ')) as $row) {
$result = $row[0];
switch ($result) {
case 1:
eLog(Lock . $thelock . ' released');
break;
case 0:
eLog(Lock . $thelock . ' was not gotten
using current connection id (' . $connectionid . '), not released');
break;
case NULL:
eLog(Lock . $thelock . ' does not exist,
not released');
break;
default:
break;
}
}
--
Charles Whitaker
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