I have a database that has 20 rows each row I had set a Boolean value to it, so it is by default zero and when a row gets viewed its value changes to 1
I want the database to send any kind of signal that when 10 rows their value change from zero to 1, a certain PHP file fires up and starts a process that will affect only these 10 rows
How can I do that?
Thanks in advance
I would say, query from the php file every set amount of time to your database
The other way, database to execute a php file is almost impossible.
If you are using mySQL as database, a trigger could invoke the sys_exec() UDF available here: https://github.com/mysqludf/lib_mysqludf_sys#readme
So, there might be a possibility, actually, via an UDF function that would launch the php executable/script; not that easy, but seems possible ;-)
Invoking php from mysql is impossible, all you can do is set cron jobs for it. Cron job check mysql after certain interval of time and run the respected code
Every database is only a storage and it is its purpose in the system. Don't try to trigger any external process by the storage. The communication with the storage should be only a one way.
Rather think how to trigger your process from outside. Generally, there are two approaches:
a script that will check your database data in some interval like 1s, 10s, 1min or whatever would fit for a particular process
the current process that is updating your data can check your data and trigger another process if needed.
You can not trigger external file/script from mysql.
What you can do is create a cron job which run after certain interval of time which check database and perform certain operations.
Related
My host (blueangelhost.com) claims that I can't use the event scheduler because it takes up too many resources. I have access to cron jobs in cPanel, but I've tried and they don't seem to work.
So, my question: Is there any kind of efficient PHP code that will automatically truncate a MySQL table in a database?
Well, if it needs to be automatic, or at a specific time, not really. But you could have your website trigger the script when someone gets on it, here's the approach you could use:
On a script that is run on every page (header, menu,footer, layout):
Check in DB or file, the date of the last truncate;
If the date is yesterday, run the truncate;
Change DB or file and put current date;
This way, it will execute once a day. But never at the same time, and not if no one walks on your website for a whole day.
I am developing a website and got a database where people can insert data (votes). I want to keep a counter in the header like "x" votes have been cast. But it is possible that there will be a lot of traffic on the website soon. Now I can do it with the query
SELECT COUNT(*) FROM `tblvotes
and then display number in the header, but then every time the users changes page, it will redo the query, so I am thinking, maybe it is better to the query once every 30 sec (so much less load on the mysql server) but then I need to save the output of it to some place (this shouldn't be so hard; I can write it to a textfile?) But how can I let my website automatically every 30 sec run the query and put the number in the file. I got no SSH to the server so I can t crontab it?
If there is something you might not understand feel free to ask!
Simplest approach: Write the result into a local textfile, check the filetime of the textfile on every request to be less than now() + 30 seconds, and if so, update the file. To update, you should lock the file. While the file is being updated, other users for whom the condition now() + 30 is met should only read the currently existing file to avoid race conditions.
Hope that helps,
Stefan
Crontabs can only run every minute, at its fastest.
I think there is a better solution to this. You should make an aggregate table in which the statistical information is stored.
With a trigger on the votes_table, you can do 'something' every time the table receives a INSERT statement.
The aggregate table will then store the most accurate information, which you then can query to display the count.
Better solution will be using some cache mechanism (e.g. APC) instead of files if your server allows it.
If you can, you may want to look into using memcached. It allows you to set an expiry time for any data you add to it.
When you first do the query, you write the md5 of the query text associated with the result. On subsequent queries, look for the data in memcached. If it is expired, you can redo the sql query and then rewrite it to memcached.
Okay, so the first part of your question is basically about caching the result of the total votes to be included in the header of your page. Its a very good idea - here is an idea of how to implement it...
If you can not enable a crontab (even with out SSH access you might be able to set this up using your hostings control panel), you might be able to get away with using an external 3rd party cronjob service. (Google has many results for this)...
Everytime your cronjob runs, you can create/update a file that simply contains some PHP arrays -
$fileOutput = "<"."?php\n\n";
$fileOutput .= '$'.$arrayName.'=';
$fileOutput .= var_export($yourData,true);
$fileOutput .= ";\n\n?".">";
$handle = fopen(_path_to_cache_file,'w+');
fwrite($handle,$fileOutput);
fclose($handle);
That will give you a PHP file that you can simply include() into your header markup and then you'll have access to the $yourData variable under the name $arrayName.
I'm creating a web application where every row of a table needs to be processed. I'm spawning one child PHP process per table row. I'm implementing a safety mechanism, so if a PHP process is interrupted processing a row, a new PHP process will spawned to process said row. To do this I'm going to create a new table where all PHP processes check in every 10 seconds or so. I need MySQL to delete all rows that haven't been checked into for 5 minutes or more, so my application will know to create a new PHP child to process that row.
I know it's possible to get MySQL to run queries on an interval, but I don't know how.
~Enter stackoverflow~
Edit: I was hoping to learn how to do this 100% MySQL. Is there no way to set MySQL to run a query every hour, or at a specific time each day or such?
Crontab. You can run the query directly using the mysql client (mysql -uusername -ppassword dbname -e 'query here') or schedule a PHP script which runs the query.
DELETE FROM table WHERE checked_into < CURRENT_TIMESTAMP - INTERVAL 5 MINUTE
MySQL Events are tasks that run according to a schedule. Therefore, we sometimes refer to them as scheduled events. ... Conceptually, this is similar to the idea of the Unix crontab (also known as a “cron job”) or the Windows Task Scheduler.
http://dev.mysql.com/doc/refman/5.1/en/events-overview.html
And here is the lovely syntax: http://dev.mysql.com/doc/refman/5.1/en/create-event.html
One way to run MySQL queries on a certain interval would be to set up a cron job. Assuming you've got full access to your webserver, this should be doable. You'd just make a PHP page that does the SQL operations you want to occur every X time interval, and then set the script to run on that interval via cron jobs. More specifics: http://en.wikipedia.org/wiki/Cron
I think what you are looking for is an event scheduler, first introduced in MySQL 5.1.
On a side note, maybe you should redesign your program a little to avoid the extra layer of event scheduler:
Instead of deleting a row, where a process has not checked in for a while, just have a column with a check in timestamp. Then if some row has a very old check in timestamp, you can spawn a new PHP process for it.
So I have a game which has a scoreboard based on weekly scores. At the end of the week I would like it to automatically delete all the entries and cache new values again. Issue is I don't know how to trigger such an even via PHP! Any help?
Sounds like you should set up a cron job.
It seems you have unusual database design.
I know no site (gaming or not) that erases weekly data.
The purpose of database is to hold data. Why not to let it just do it's job?
Create a small php file which connects to mysql and TRUNCATES the table ( better and faster to truncate instead of delete all ).
And add this to your crontab.
0 0 * * 0 PATH_TO_PHP myFile.php
Here is a crontab tutorial :
http://clickmojo.com/code/cron-tutorial.html
Generally these type of activities are carried out using Cron Jobs or Task Schedulers which will run periodically to perform the action you would specify.
I think the easiest way would be creating a PHP script which deletes everything on the table, then creating a crontab job for it.
hello i have some problems with my php ajax script
i'm using PHP/mysql
i have a field in my accounts table that will save the time for the last request from a user, i will use that to kick the idle user out of the chat. and i will make a php function that will delete all the rows that its time field more than the time limit, but where should i use this method is it okay to fire it every time a new request sent to my index.php ? i think that will make a huge load on the server,is n't it ? do you have a better solution?
thanks
There are two viable solutions:
either create a small PHP script that makes this deletion in an infinite loop (and of course sleeps for a specified amount of time before doing it again), and then start it via PHP CLI,
or create one that makes the deletion only once, then exits, and call it from cron (if you're using a UNIXish server) or Task Scheduler (on Windows).
The second one is simpler, but its drawback is that you can't make the interval between the deletions shorter than 60 seconds.
A solution could be to fire the deletion function just once every few requests.
Using rand() you could give it a 1 in 100 (for example) change of running the function, so that about one page request in a 100 will clean up the expired data.