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  • Question about the benefit of using an ORM

    - by johnny
    I want to use an ORM for learning purposes and am try nhibernate. I am using the tutorial and then I have a real project. I can go the "old way" or use an ORM. I'm not sure I totally understand the benefit. On the one hand I can create my abstractions in code such that I can change my databases and be database independent. On the other it seems that if I actually change the database columns I have to change all my code. Why wouldn't I have my application without the ORM, change my database and change my code, instead of changing my database, orm, and code? Is it that they database structure doesn't change that much? I believe there are real benefits because ORMs are used by so many. I'm just not sure I get it yet. Thank you. EDIT: In the tutorial they have many files that are used to make the ORM work http://www.hibernate.org/362.html In the event of an application change, it seems like a lot of extra work just to say that I have "proper" abstraction layers. Because I'm new at it it doesn't look that easy to maintain and again seems like extra work, not less.

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  • MVC without ORM is not real MVC?

    - by ajsie
    at the moment im integrating ORM (doctrine) into a MVC framework (codeigniter). then it hit me that this was the obvious way of setting up a MVC: the controller calls the models that are representing database tables. look at this picture: MVC + ORM then i wondered, how can a MVC without ORM be real MVC? cause then the models are not real objects, rather aggregations of different functions that perform CRUD, then returning the result to the controller. and there is no need for a state (object properties) i guess so the functions would be all static? correct me if im wrong on this one. i guess a lot of people are using models without ORM. please share your thoughts. how do your models look like?

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  • How to custom query using ORM in Fuelphp?

    - by viyancs
    I have a problem when I want to query table using ORM ,example I have article table with field id,author,text. My code like this : // Single where $article = Model_Article::find()->where('id', 4); print_r($article); that't code will be fetch all field on table article, it's like select * from article where id = 4 Try Possibility $article = Model_Article::find(null, array('id','title'))->where('id', 3); the response is object(Orm\Query)#89 (14) { ["model":protected]=> string(10) "Model_Article" ["connection":protected]=> NULL ["view":protected]=> NULL ["alias":protected]=> string(2) "t0" ["relations":protected]=> array(0) { } ["joins":protected]=> array(0) { } ["select":protected]=> array(1) { ["t0_c0"]=> string(5) "t0.id" } ["limit":protected]=> NULL ["offset":protected]=> NULL ["rows_limit":protected]=> NULL ["rows_offset":protected]=> NULL ["where":protected]=> array(1) { [0]=> array(2) { [0]=> string(9) "and_where" [1]=> array(3) { [0]=> string(5) "t0.id" [1]=> string(1) "=" [2]=> int(3) } } } ["order_by":protected]=> array(0) { } ["values":protected]=> array(0) { } } that's is not return id or title field. but when i'm try by adding get_one() method $article = Model_Article::find(null, array('id','title'))->where('id', 3)->get_one(); id is return , but title is not and another field, i don't know why ? Reference ORM Discussion FuelPHP it's say ORM currently will be select all column, no plans to change that at the moment. My Goal I want to query in orm like this select id,owner from article where id = 4 it's will be return only id & owner, how i can get that using orm ?

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  • Does it make sense to use ORM in Android development?

    - by Heinzi
    Does it make sense to use an ORM in Android development or is the framework optimized for a tighter coupling between the UI and the DB layer? Background: I've just started with Android development, and my first instinct (coming from a .net background) was to look for a small object-relational mapper and other tools that help reduce boilerplate clode (e.g. POJOs + OrmLite + Lombok). However, while developing my first toy application I stumbled upon a UI class that explicitly requires a database cursor: AlphabetIndexer. That made me wonder if maybe the Android library is not suited for a strict decoupling of UI and DB layer and that I will miss out on a lot of useful, time-saving features if I try to use POJOs everywhere (instead of direct database access). Clarification: I'm quite aware of the advantages of using ORM in general, I'm specifically interested in how well the Android class library plays along with it.

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  • How to suggest using an ORM instead of stored procedures?

    - by Wayne M
    I work at a company that only uses stored procedures for all data access, which makes it very annoying to keep our local databases in sync as every commit we have to run new procs. I have used some basic ORMs in the past and I find the experience much better and cleaner. I'd like to suggest to the development manager and rest of the team that we look into using an ORM Of some kind for future development (the rest of the team are only familiar with stored procedures and have never used anything else). The current architecture is .NET 3.5 written like .NET 1.1, with "god classes" that use a strange implementation of ActiveRecord and return untyped DataSets which are looped over in code-behind files - the classes work something like this: class Foo { public bool LoadFoo() { bool blnResult = false; if (this.FooID == 0) { throw new Exception("FooID must be set before calling this method."); } DataSet ds = // ... call to Sproc if (ds.Tables[0].Rows.Count > 0) { foo.FooName = ds.Tables[0].Rows[0]["FooName"].ToString(); // other properties set blnResult = true; } return blnResult; } } // Consumer Foo foo = new Foo(); foo.FooID = 1234; foo.LoadFoo(); // do stuff with foo... There is pretty much no application of any design patterns. There are no tests whatsoever (nobody else knows how to write unit tests, and testing is done through manually loading up the website and poking around). Looking through our database we have: 199 tables, 13 views, a whopping 926 stored procedures and 93 functions. About 30 or so tables are used for batch jobs or external things, the remainder are used in our core application. Is it even worth pursuing a different approach in this scenario? I'm talking about moving forward only since we aren't allowed to refactor the existing code since "it works" so we cannot change the existing classes to use an ORM, but I don't know how often we add brand new modules instead of adding to/fixing current modules so I'm not sure if an ORM is the right approach (too much invested in stored procedures and DataSets). If it is the right choice, how should I present the case for using one? Off the top of my head the only benefits I can think of is having cleaner code (although it might not be, since the current architecture isn't built with ORMs in mind so we would basically be jury-rigging ORMs on to future modules but the old ones would still be using the DataSets) and less hassle to have to remember what procedure scripts have been run and which need to be run, etc. but that's it, and I don't know how compelling an argument that would be. Maintainability is another concern but one that nobody except me seems to be concerned about.

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  • How do you handle domain logic that spans multiple model objects in an ORM?

    - by duality_
    So I know that business logic should be placed in the model. But using an ORM it is not as clear where I should place code that handles multiple objects. E.g. let's say we have a Customer model which has a type of either sporty or posh and we wanted to customer.add_bonus() to every posh customer. Where would we do this? Do we create a new class to handle all this? If yes, where do we put it (alongside all the other model classes, but not subclass it from the ORM?)? I'm currently using django framework in python, so specific suggestions are even more wanted.

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  • Kohana Sessions data does not persist across pages in chrome and ir browsers

    - by user1062637
    Kohana Session data does not persist across pages opened in Chrome and IE browsers the same works fine in a Firefox browser Kohana version used is 2.3 session config files hold $config['driver'] = 'native'; /** * Session storage parameter, used by drivers. */ $config['storage'] = ''; /** * Session name. * It must contain only alphanumeric characters and underscores. At least one letter must be present. */ $config['name'] = 'NITWSESSID'; /** * Session parameters to validate: user_agent, ip_address, expiration. */ $config['validate'] = array(); /** * Enable or disable session encryption. * Note: this has no effect on the native session driver. * Note: the cookie driver always encrypts session data. Set to TRUE for stronger encryption. */ $config['encryption'] = FALSE; /** * Session lifetime. Number of seconds that each session will last. * A value of 0 will keep the session active until the browser is closed (with a limit of 24h). */ $config['expiration'] = 2700; /** * Number of page loads before the session id is regenerated. * A value of 0 will disable automatic session id regeneration. */ $config['regenerate'] = 0; /** * Percentage probability that the gc (garbage collection) routine is started. */ $config['gc_probability'] = 2; Help needed urgently

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  • KO3: How to deal with stylesheets and scriptfiles

    - by Svish
    I'm using Kohana 3 and it's template controller. My main site template controller currently looks something like this: <?php defined('SYSPATH') or die('No direct script access.'); abstract class Controller_SiteTemplate extends Controller_Template { public function before() { parent::before(); // Initialize default template variables $this->template->styles = Kohana::config('site.styles'); $this->template->scripts = Kohana::config('site.scripts'); $this->template->title = ''; $this->template->content = ''; } } And then in my template view I do: <?php # Styles foreach($styles as $file => $media) echo HTML::style($file, array('media' => $media)).PHP_EOL ?> <?php # Scripts foreach($scripts as $file) echo HTML::script($file).PHP_EOL ?> This works alright. The problem is that it requires the style- and script files to be added in the controller, which shouldn't really have to care about those. It also makes it a hassle if the views are done by someone else than me since they would have to fool around with the controller just to add a new stylesheet or a new script file. How can this be done in a better way? Just to clearify, what I am wondering is how to deal with page specific stylesheets and scripts. The default and site-wide ones I have no problem with fetching from a config file or just put directly in the template view. My issue is how to add custom ones for specific pages in a good way.

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  • Log MySQL Query In Kohana 3

    - by Asif
    Hi All, I am using Kohana 3. I want to log the MySQL queries being executed by an application. The reason to determine the query of type INSERT,UPDATE and DELETE which are being executed in a process and store them in another MySQL table with date-time for further reference. Can anybody tell how can I achieve this?

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  • How to override module classes in Kohana 3?

    - by Luke
    In Kohana 3, how can I override/extend a module class? E.g. I want to add functionality to the Auth module that is specific to my application. In this case I want to extend the abstract Auth class located in the classes folder of the Auth module. What naming convention should I use for my Auth class and where in the file system do I place my class file?

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  • Where are Kohana config files?

    - by elmonty
    I've just installed Kohana 3.0.4.2 and I have run the index.php file successfully. According to the documentation, the next step is to edit the config files in the application/config folder. I have that folder but there are no files in it! I downloaded the package again to make sure it wasn't corrupted, but the same problem exists. Why is the application/config folder empty?

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  • Do I really need an ORM?

    - by alchemical
    We're about to begin development on a mid-size ASP.Net MVC 2 web site. For a typical page, we grab data and throw it up on the web page, i.e. there is not much pre-processing of the data before it is sent to the UI. We're now making the decision whether or not to use an ORM and if yes, which one. We had been looking at EF2 AKA EF4 (ASP.Net Entity Framework in VS 2010) as one possibility. However, I'm thinking a simple solution in this case may be just to use datatables. The reason being that we don't plan to move the data around or process it a lot once we fetch it, so I'm not sure there is that much value in having strongly-typed objects as DTOs. Also, this way we avoid mapping altogether, thereby I think simplifying the code and allowing for faster development. I should mention budget is an issue on this project, as well as speed of execution. We are striving for simplicity anywhere we can, both to keep the budget smaller, the schedule shorter, and performance fast. We haven't fully decided this yet, but are currently leaning towards no ORM. Will we be OK with the no ORM approach or is an ORM worth it?

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  • Asynchronous daemon processing / ORM interaction with Django

    - by perrierism
    I'm looking for a way to do asynchronous data processing with a daemon that uses Django ORM. However, the ORM isn't thread-safe; it's not thread-safe to try to retrieve / modify django objects from within threads. So I'm wondering what the correct way to achieve asynchrony is? Basically what I need to accomplish is taking a list of users in the db, querying a third party api and then making updates to user-profile rows for those users. As a daemon or background process. Doing this in series per user is easy, but it takes too long to be at all scalable. If the daemon is retrieving and updating the users through the ORM, how do I achieve processing 10-20 users at a time? I would use a standard threading / queue system for this but you can't thread interactions like models.User.objects.get(id=foo) ... Django itself is an asynchronous processing system which makes asynchronous ORM calls(?) for each request, so there should be a way to do it? I haven't found anything in the documentation so far. Cheers

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  • For an ORM supporting data validation, should constraints be enforced in the database as well?

    - by Ramnique Singh
    I have always applied constraints at the database level in addition to my (ActiveRecord) models. But I've been wondering if this is really required? A little background I recently had to unit test a basic automated timestamp generation method for a model. Normally, the test would create an instance of the model and save it without validation. But there are other required fields that aren't nullable at the in the table definition, meaning I cant save the instance even if I skip the ActiveRecord validation. So I'm thinking if I should remove such constraints from the db itself, and let the ORM handle them? Possible advantages if I skip constraints in db, imo - Can modify a validation rule in the model, without having to migrate the database. Can skip validation in testing. Possible disadvantage? If its possible that ORM validation fails or is bypassed, howsoever, the database does not check for constraints. What do you think? EDIT In this case, I'm using the Yii Framework, which generates the model from the database, hence database rules are generated also (though I could always write them post-generation myself too).

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  • How to structure a Kohana MVC application with dynamically added fields and provide validation and f

    - by Matt H
    I've got a bit of a problem. I have a Kohana application that has dynamically added fields. The fields that are added are called DISA numbers. In the model I look these up and the result is returned as an array. I encode the array into a JSON string and use JQuery to populate them The View knows the length of the array and so creates as many DISA elements as required before display. See the code below for a summary of how that works. What I'm finding is that this is starting to get difficult to manage. The code is becoming messy. Error handling of this type of dynamic content is ending up being spread all over the place. Not only that, it doesn't work how I want. What you see here is just a small snippet of code. For error handling I am using the validation library. I started by using add_rules on all the fields that come back in the post. As they are always phone numbers I set a required rule (when it's there) and a digit rule on the validation-as_array() keys. That works. The difficulty is actually giving it back to the view. i.e. dynamically added javascript field. Submits back to form. Save contents into a session. View has to load up fields from database + those from the previous post and signal the fields that have problems. It's all quite messy and I'm getting this code spread through both the view the controller and the model. So my question is. Have you done this before in Kohana and how have you handled it? There must be an easier way right? Code snippet. -- edit.php -- public function phone($id){ ... $this->template->content->disa_numbers = $phones->fetch_disa_numbers($this->account, $id); ... } -- phones.php -- public function fetch_disa_numbers($account, $id) { $query = $this->db->query("SELECT id, cid_in FROM disa WHERE owner_ext=?", array($id)); if (!$query){ return ''; } return $query; } -- edit_phones.php --- <script type="text/javascript"> var disaId = 1; function delDisaNumber(element){ /* Put 'X_' on the front of the element name to mark this for deletion */ $(element).prev().attr('name', 'X_'+$(element).prev().attr('name')); $(element).parent().hide(); } function addDisaNumber(){ /* input name is prepended with 'N_' which means new */ $("#disa_numbers").append("<li><input name='N_disa"+disaId+"' id='disa'"+ "type='text'/><a class='hide' onClick='delDisaNumber(this)'></a></li>"); disaId++; } </script> ... <php echo form::open("edit/saveDisaNumbers/".$phone, array("class"=>"section", "id"=>"disa_form")); echo form::open_fieldset(array("class"=>"balanced-grid")); ?> <ul class="fields" id="disa_numbers"> <?php $disaId = 1; foreach ( $disa_numbers as $disa_number ){ echo '<li>'; echo form::input('disa'.$disaId, $disa_number->cid_in); echo'<a class="hide" onclick="delDisaNumber(this)"></a>'; echo "</li>"; $disaId++; } ?> </ul> <button type="button"onclick="addDisaNumber()"><a class="add"></a>Add number</button> <?php echo form::submit('submit', 'Save'); echo form::close(); ?>

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  • Best ORM, Simple data Structures, Strong Query analysis.

    - by sayth
    What is the best ORM db combination for simple data structures. That is data that contains names as identifiers and locations, but whose main interaction will be numerical data for times(sports durations), and currency related data. I initially want to create a sports data base that will take names and statistics. Secondarily I plan to start into an investment and stock analysis db. Which ORM suits storing many numerical types and have strong query functions? I really am not biased to db engine (most likely use sqlite or mongo) so any suggestions to best network less db server to suit said ORM appreciated.

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  • ORM on which standards i can select?

    - by just_name
    Q: This question is about how can i figure or select the convenient ORM to my web application. when beginning a new web application,What are the criteria on which i can consider a specific ORM is better than another one for my project or case(web application)? another part of my question : when i begin any web application i use three layers: the DB layer (which contains the connections , and handle the CRUD operations ) the Managers layer(the Data Access Layer) a class for each table on my db (loosely coupled with the previous layer )it contains the CRUD operations for the specific table and the other required operations. the interface layer.. and i use Object Data source.Is that considered as an ORM (as a concept) or I'm wrong in understanding this concept. note:I still a beginner in this field ,, and every day i learn more about web development. please i want explanation and suggestions for this point. Thanks in advance.

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  • Kohana and Javscript path

    - by Leonti
    Hi! I have a following Kohana setup: All my files are placed under 'public_html/koh' My js files are placed under 'public_html/koh/media/js/' I use html::script helper to include those javascript files which generates me following html code: In my js I access one of controllers like 'json/getsomething' (which is http://localhost/koh/json/getsomething). It works OK as long as I'm staying in top of the controller: http://localhost/koh/home When I go to 'http://localhost/koh/home/index' it renders the same page of course but 'json/getsomething' is not accessible from Javascript anymore. How can I solve this problem? Include Javascript using absolute path? Create a variable in js like var fullPath = 'http://localhost/koh/'? What is the best practice to do it? Leonti

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  • Catch database exception in Kohana

    - by danilo
    I'm using Kohana 2. I would like to catch a database exception to prevent an error page when no connection to the server can be established. The error displayed is system/libraries/drivers/Database/Mysql.php [61]: mysql_connect() [function.mysql-connect]: Lost connection to MySQL server at 'reading initial communication packet', system error: 110 The database server is not reachable at all at this point. I'm doing this from a model. I tried both public function __construct() { // load database library into $this->db try { parent::__construct(); } catch (Exception $e) { die('Database error occured'); } } as well as try { $hoststatus = $this->db->query('SELECT x FROM y WHERE z;'); } catch (Exception $e) { die('Database error occured'); } ...but none of them seemed to work. It seems as if no exception gets passed on from the main model. Is there another way to catch the database error and use my own error handling?

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  • Kohana input & validation libraries - overlap?

    - by keithjgrant
    I'm familiarizing myself with Kohana. I've been reading up on the Input library, which automatically pre-filters GET and POST data for me, and the Validation libary, which helps with form validation. Should I use both together? The examples given in the Validation library documentation use the unfiltered $_POST array instead of $this->input->post(). Seems to me it would be more secure to chain the two, but the two sets of documentation seem to make no mention of each other, so I don't know if this would be redundant or not.

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  • Kohana controller shows blank page if missing URI segment/argument

    - by Petruza
    When accessing http://www.nowplayingnashville.com/event2/detail/440698386/Whatever the controller shows normally. But when omitting the last parameter (event's title, which can be any string), http://www.nowplayingnashville.com/event2/detail/440698386/ It shows blank. I added a default value and tried to hardcode the title on the first line of the controller, but it doesn't work anyway. It looks like a view issue, because I can add an echo at the end of the controller and it gets printed, so the controller is executing to the end, but the views aren't displayed. This problem is present on the live site, but I checked out the code on my local machine and it works perfectly without a title. That's strange. Could it be a Kohana or Apache configuration issue?

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  • Kohana v2 - problem with routes

    - by yoda
    Hi, I'm attempting to set some custom routes in Kohana v2. What I'm looking for is some method that allow the system to : follow a pre-defined name to it's related root; redirect the non-matched url's into another controller; To give you a more clear view over the problem, I want the first url parameter to be associated to certain pages (contacts, home, services, about us, etc), and those urls who doesn't match the previous pages would be routed into a controller called products, in order to determine if the first url parameter regards a product name. Here's a sample of what I have : $config['_default'] = 'home'; $config['([a-zA-Z]+)'] = 'products/showcat/$1'; What am I missing here? Thanks in advance!

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  • Inheritance in kohana

    - by Binaryrespawn
    Hi all, I have recently started to use Kohana and I know inheritance is in infancy stages at the moment. The work around is using a $_has_one annotation on the child class model. In may case i have "page" as the parent of "article". I have something like, protected $_has_one = array('mypage'=>array('model'=>'page', 'foreign_key'=>'id')); In my controller, I have an action which queries the database. In this query I am trying to access fields form the parent of "article" which is the "page". $n->articles=ORM::factory('article')->where('expires','=',0) ->where('articledate','<',date('y-m-d')) ->where('expirydate','>',date('y-m-d')) ->where('mypage->status','=','PUBLISHED') ->order_by('articledate','desc') ->find_all(); The status column resides in the page table and my query is generating an error to the effect of "cannot find status", clearly because it belongs to the parent. Any ideas ?

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  • .htaccess for multiple application in Kohana V3

    - by khairil
    Hi I have setup multiple application in Kohana v3, it works normally without enabling .htaccess (to remove index.php or admin.php) my setup + system/ + modules/ + applications/ + public/ + bootstrap.php + ... + admin/ + bootstrap.php + ... + index.php (for 'public' application) + admin.php (for 'admin' application) so to access the frontend sample url will be; http://mydomain.com/index.php/(controller_name)/... and to access administration site; http://mydomain.com/admin.php/(controller_name)/... The task is, I want to remove and replace index.php (default url) and admin.php with /admin/ using .htaccess (mod_rewrite) so it can be http://mydomain.com/(controller_name) <- 'public' application http://mydomain.com/admin/(controller_name) <- 'admin' application my current .htaccess (not working) is; # Turn on URL rewriting RewriteEngine On # Installation directory RewriteBase /ko3/ # Protect hidden files from being viewed Order Deny,Allow Deny From All # Protect application and system files from being viewed RewriteRule ^(?:web-apps|modules|core)\b.* index.php/$0 [L] # Allow any files or directories that exist to be displayed directly RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d # TODO: rewrite admin URL to admin.php/URL #RewriteRule ^admin/(.*) admin.php/$0 [L] # Rewrite all other URLs to index.php/URL RewriteRule .* index.php/$0 [PT]

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