I created an extension for joomla using:
$id=$database->insertid();
I just covered that if two users are logged on to the site will fit together perform two records in the database and then this statement will return in both cases the same value.
in php you can solve this problem with the transactions.
In joomla how do I solve this problem?
If you have a table you are working with that extends JTable then make sure that you included the check out functionality that is optionally a part of that. THis must means adding a couple of fields like what is in the content table. This will prevent two people from editing the same row at the same time which creates a race condition in which one of the other will lose their data.
Please note that both php and joomla functions to return the last insert id rely on the mysql implementation, and mysql returns the last id inserted on the currently open connection so concurrency is not an issue
#iacoposk8 Your are right it might possible that in very rear case. Such time try to add current logged in user id in your sql query or any where so that it doesn't make any confict. I hope you get it what i want to say. Thanks
Related
I'm upgrading an old procedural site to laravel 5.2, and I'm struggling with the old routes I made.
On this website, the routes were made like this : {user_slug}/{content_slug}.html. For the moment, I use cviebrock/eloquent-sluggable to generate the slugs, but I'm open to another one if this one cannot meet my needs.
I have two questions :
Can I make the content-slug unique, but per user ?
How can I write the route and the controller in order to match the correct user slug ad the correct content slug ?
I have not done this myself but I believe there would be a way in the validation rules to do this. Here is an untested rough draft to check content_slug in the posts table but only check uniqueness where the user_id field equals a variable:
'content_slug' => "unique:posts,content_slug,NULL,id,user_id,$user->id"
Depending on who you ask, they may advise you (either instead of or as well as doing the above) to set up a key in the database based on the user_id and content_slug fields. This way the database returns an error if an insert is attempted as well as gives a performance boost when running a query off that index. Queries off of an index can literally give an exponential performance increase.
I'm implementing my database. xD
Should I make changes, but I would like any further information about it, by those who are more experienced than me.
1) Should I make sure to keep a tracking for security reasons.
I would like to create a table "access", which contains the following fields.
id, id_user, browser, os, dates, ip.
What should I change, to ensure that each time the user login, is added a new record in this table.
If you have more tips on how to improve this point, I'd be grateful.
2) I would like to do so you can make the user choose whether the session of his choice or whether permanent or not.
I could only find a way to do it, that the session lasting for a certain period of time.
But I would like to implement a graft.
3) Should I implement multiple sessions, I'll explain.
The possibility that every user experience their sessions, such as facebook ago.
You can see how many active sessions exist and on what date.
I thought at a table like this:
id, id_user, queues, browser, os, dates, ip.
What do you think, you can do what?
If yes, what should I change in the structure of laravel to do this?
Thank you in advance who will help me.
I apologize for my English and the long text.
1) You should use also timestamp that logging table. You can use the built in updated_at and created_at timestamps. In your login function simply create a new instance of the model, populate the attributes and save() it.
2) There is a built in remember me behavior that you can use. More details can be found in the Laravel docs http://laravel.com/docs/4.2/security
3) Can you explain more of why you would want to implement multiple sessions? Why would this be useful for your application?
I hope my answer helps.
As far as I know, all QuickBase API calls are called using the following syntax: http://<quickbase>/db/<dbid>?
Is there a way to get the dbid field without navigating to that database table within QuickBase?
If the above is not possible, would anyone recommend anything other than creating another table that stores the IDs of the tables you want?
With the latter method, I believe I would only need to store one dbid and could pull down the rest (which I believe would still need to be user entered, but would be better than requiring them to change the code).
Thanks for the help!
API_GetSchema will return the list of dbids.
https://www.quickbase.com/db/<yourApplicationId>?act=API_GetSchema&apptoken=<yourApplicationTokenId>&fmt=flat
I am doing a ajax based search which suggests the values from the database tables as the user inputs fields in the search box. It does work but its really very slow, takes more than 10 seconds minimum for any suggestions to load. how do I optimize this to make it fast..
Like Index it/save it in cache/crawl?
Right now autoSearch() js function is fired which retrieves data from the related table to load the suggestions. how do I make this faster?
I dont know if this will make a difference but I am using grails/groovy for application development.
Thanks
Priyank
Have you added an index to any searched fields (or checked in the database to make sure the examined fields are indexed)?
The Grails GORM does not automatically create indices for text fields unless you add the appropriate static mapping to your domain class.
this may be a easy question, but I really need a light to go on.
I have this huge PHP system in codeigniter, and I'm using the library Quick Auth, and I need let users log on only at one computer/browser at a given time. So if Jake logs on In PC1, then Jakes tries to log on in PC2, PC1 session get invalidated and closed.
I was trying to manually search in the ci_sessions database table to try to eliminate the other user session, but seems like too pain. I want to know if there's one simple solution, I have no problem extending session, but I need more like an advice.
Thanks in advance
You will have to modify either the table indexes or session library code to limit one user to a single session. This can be done by:
Adding a unique index for the username (or ID) and the cookie/session ID
Modifying the library code to INSERT OR REPLACE based on the user/cookie