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  • Entity Framework with File-Based Database

    - by Dave Swersky
    I am in the process of developing a desktop application that needs a database. The application is currently targeted to SQL Express 2005 and works wonderfully. However, I'm not crazy about having this dependency on SQL Express and would prefer to use a small file-based database. My problem is that I am using Entity Framework. I have tried both SQL Compact and SQLite, and they both have bizarre problems with EF v1. I get errors creating the Model, invalid models when it does get created... it's a nightmare. I'm about ready to give up and write a data layer and repository in the good-old-school Connection/Command pattern. Not my favorite plan... Is there a lightweight, file-based database out there that plays well with EF? OR Is there a better ORM tool that I should use instead of EF with my lightweight DB?

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  • Access one database from multiple ORMs :: Caching issue

    - by kaptan
    I know this is not a good idea and the best would be to let the applications talk Web Services. But I have a situation where the legacy application is accessing a database with an ORM and I need to access the same database from the new .net application using Fluent nHibernate. So the question is what problems this will make and how to solve them? I guess the main issue is the caching. I need to disable the caching on one of the applications (which would be the new app). So how can I disable caching in nHibernate? Is there anything else that should be careful about?

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  • Are there Python ORMs out there that support multiple independent databases concurrently in use?

    - by sdt
    I'm writing an application in Python where I wish to use sqlite as the backing store for documents edited by the app, with documents generally living in memory, but being saved to disk-based databases when the application saves. Ideally I'd like to use something like an ORM to make access to the data from my Python application code simple. Unfortunately it seems like the majority of Python ORMs, including SQLAlchemy, SQLObject, Django, and Storm, associate the database connection (or engine or whatever) with the classes representing table data, rather than instances of those classes. This restricts these ORMs to working with a single database connection across all instances. Since I'd like to support having multiple documents open simultaneously, this isn't going to work for me. Are there any ORMs out there that support this usage model in Python? Bazaar seems to support this, but it's quite out of date, and at first glance appears to have some other shortcomings. Thanks for any suggestions!

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  • Kohana Database Library - How to Execute a Query with the Same Parameters More Than Once?

    - by Noah Goodrich
    With the following bit of code: $builder = ORM::factory('branch')->where('institution_id', $this->institution->id)->orderby('name'); I need to first execute: $count = $builder->count_all(); Then I need to execute: $rs = $builder->find_all($limit, $offset); However, it appears that when I execute the first query the stored query parameters are cleared so that a fresh query can be executed. Is there a way to avoid having the parameters cleared or at least copy them easily without having to reach directly into the Database driver object that stores the query parameters and copy them out? We are using Kohana 2.3.4 and upgrading is not an option.

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  • SQLite doesn't have booleans or date-times...but C# does

    - by DanM
    I've been thinking about using SQLite for my next project, but I'm concerned that it seems to lack proper datetime and bit data types. If I use DbLinq (or some other ORM) to generate C# classes, will the data types of the properties be "dumbed down"? Will date-time data be placed in properties of type string or double? Will boolean data be placed in properties of type int? If yes, what are the implications? I'm envisioning a scenario where I need to write a whole second layer of classes with more specific data types and do a bunch of transformations and casts, but maybe it's not so bad. If you have any experience with this or a similar scenario, what are your "lessons learned"?

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  • How to Command Query Responsibility Segregation (CQRS) with ASP.NET MVC?

    - by Jeffrey
    I have been reading about Command Query Responsibility Segregation (CQRS). I sort of wonder how would this work with ASP.NET MVC? I get the idea of CQRS conceptually it sounds nice and sure does introduce some complexities (event and messaging pattern) compared to the "normal/common" approach . Also the idea of CQRS sort of against the use of ORM in some ways. I am trying to think how I could use this pattern in the coming projects so if anyone has experience in combining CQRS with ASP.NET MVC and NHibernate please give some concrete examples to help me better understand CQRS and use with ASP.NET MVC. Thanks!

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  • SQLite doesn't have booleans or date-times.

    - by DanM
    I've been thinking about using SQLite for my next project, but I'm concerned that it seems to lack proper datetime and bit data types. If I use DbLinq (or some other ORM) to generate C# classes, will the data types of the properties be "dumbed down"? Will date-time data be placed in properties of type string or double? Will boolean data be placed in properties of type int? If yes, what are the implications? I'm envisioning a scenario where I need to write a whole second layer of classes with more specific data types and do a bunch of transformations and casts, but maybe it's not as bad as I fear. If you have any experience with this or a similar scenario, how did you handle it?

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  • Doctrine_Table_Exception: Unknown relation alias shoesTable [closed]

    - by Sadiqur Rahman
    I am getting following error message: Doctrine_Table_Exception: Unknown relation alias shoesTable in /home/public_html/projects/giftshoes/system/database/doctrine/Doctrine/Relation/Parser.php on line 237 My Code is below: ------------BaseShoe------------ <?php // Connection Component Binding Doctrine_Manager::getInstance()->bindComponent('Shoes', 'sadiqsof_giftshoes'); /** * BaseShoes * * This class has been auto-generated by the Doctrine ORM Framework * * @property integer $sku * @property string $name * @property string $keywords * @property string $description * @property string $manufacturer * @property float $sale_price * @property float $price * @property string $url * @property string $image * @property string $category * @property Doctrine_Collection $Viewes * * @package ##PACKAGE## * @subpackage ##SUBPACKAGE## * @author ##NAME## <##EMAIL##> * @version SVN: $Id: Builder.php 6820 2009-11-30 17:27:49Z jwage $ */ abstract class BaseShoes extends Doctrine_Record { public function setTableDefinition() { $this->setTableName('shoes'); $this->hasColumn('sku', 'integer', 4, array( 'type' => 'integer', 'fixed' => 0, 'unsigned' => false, 'primary' => true, 'autoincrement' => false, 'length' => '4', )); $this->hasColumn('name', 'string', 255, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '255', )); $this->hasColumn('keywords', 'string', 255, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '255', )); $this->hasColumn('description', 'string', null, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '', )); $this->hasColumn('manufacturer', 'string', 20, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '20', )); $this->hasColumn('sale_price', 'float', null, array( 'type' => 'float', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '', )); $this->hasColumn('price', 'float', null, array( 'type' => 'float', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '', )); $this->hasColumn('url', 'string', null, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '', )); $this->hasColumn('image', 'string', null, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '', )); $this->hasColumn('category', 'string', 50, array( 'type' => 'string', 'fixed' => 0, 'unsigned' => false, 'primary' => false, 'notnull' => true, 'autoincrement' => false, 'length' => '50', )); } public function setUp() { parent::setUp(); $this->hasMany('Viewes', array( 'local' => 'sku', 'foreign' => 'sku')); } } --------------ShoesTable-------- <?php class ShoesTable extends Doctrine_Table { function getAllShoes($from = 0, $total = 15) { $q = Doctrine_Query::create() ->from('Shoes') ->limit($total) ->offset($from); return $q->execute(array(), Doctrine::HYDRATE_ARRAY); } } ---------------Shoes Model----------------- <?php /** * Shoes * * This class has been auto-generated by the Doctrine ORM Framework * * @package ##PACKAGE## * @subpackage ##SUBPACKAGE## * @author ##NAME## <##EMAIL##> * @version SVN: $Id: Builder.php 6820 2009-11-30 17:27:49Z jwage $ */ class Shoes extends BaseShoes { function __construct() { parent::__construct(); $this->shoesTable = Doctrine::getTable('Shoes'); } function getAllShoes() { return $this->shoesTable->getAllShoes(); } }

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  • Java equivalent for database schema changes like South for Django?

    - by gerdemb
    I've been working on a Django project using South to track and manage database schema changes. I'm starting a new Java project using Google Web Toolkit and wonder if there is an equivalent tool. For those who don't know, here's what South does: Automatically recognize changes to my Python database models (add/delete columns, tables etc.) Automatically create SQL statements to apply those changes to my database Track the applied schema migrations and apply them in order Allow data migrations using Python code. For example, splitting a name field into a first-name and last-name field using the Python split() function I haven't decided on my Java ORM yet, but Hibernate looks like the most popular. For me, the ability to easily make database schema changes will be an important factor.

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  • What is the 'noreq' Filter Type an Alias for?

    - by Alan Storm
    I'm looking in to Magento's filtering options (Ecommerce System and PHP Framekwork with an expansive ORM system). Specifically the addFieldToFilter method. In this method, you specify a SQLish filter by passing in a single element array, with the key indicating the type of filter. For example, array('eq'=>'bar') //eq means equal array('neq'=>'bar') //neq means not equal would each give you a where clause that looks like where field = 'bar'; where field != 'bar'; So, deep in the bowels of the source, I found a comparison type named 'moreq' that maps to a = comparison operator array('moreq'=>'27') where field >= 27 The weird thing is, there's already a 'gteq' comparision type array('gteq'=>'27') where field >= 27 So, my question is, what does moreq stand for? Is is some special SQL concept that's supported in other databases that the Magento guys wants to map to MySQL, or is it just "more required" and an example what happens when you're doing rapid agile and trying to maintain backwards compatibility.

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  • PHP Doctrine 1.2 table names

    - by Ofir
    I'm trying to upgrade my doctrine ORM from 1.1.6 to 1.2.1 but i've enountered a BC issue with table names. Some of my table names have several words (e.g. t_foo_bar for class FooBar) where the t_ prefix is generated automatically with: $manager->setAttribute(Doctrine_Core::ATTR_TBLNAME_FORMAT, 't_%s'); This worked well in previous versions. In 1.2.1 however, it looks like doctrine is looking for t_foobar (instead of t_foo_bar with an underscore). Do you know how to solve this without changing the table names?

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  • Database permissions and ORMs

    - by Jonn
    I've been using .NET's Entity Framework a lot lately and have absolutely no wish to go back to using Stored Procedures. Been shocked though that the company I'm building this project for had a policy where applications were only given accounts that only had permissions to access stored procedures! Apparently, they believe that there's a security risk involved in allowing applications to access the tables/views directly. I don't get this. My first question is, can someone enlighten me as to what kind of security risk applications having direct access to the database may pose? AND If that's the case, are there any other ORM solutions that can provide a workaround to this (I can't think of any logical possibility atm) that would allow me to circumvent the restrictions on the user account to be assigned to me? OR is my understanding that I'd need direct permissions for the tables and views wrong?

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  • How do I do a semijoin using SQLAlchemy?

    - by Jason Baker
    http://en.wikipedia.org/wiki/Relational_algebra#Semijoin Let's say that I have two tables: A and B. I want to make a query that would work similarly to the following SQL statement using the SQLAlchemy orm: SELECT A.* FROM A, B WHERE A.id = B.id AND B.type = 'some type'; The thing is that I'm trying to separate out A and B's logic into different places. So I'd like to make two queries that I can define in separate places: one where A uses B as a subquery, but only returns rows from A. I'm sure this is fairly easy to do, but an example would be nice if someone could show me.

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  • Mapping tables from an existing database to an object -- is Hibernate suited?

    - by Bernhard V
    Hello! I've got some tables in an existing database and I want to map them to a Java object. Actually it's one table that contains the main information an some other tables that reference to such a table entry with a foreign key. I don't want to store objects in the database, I only want to read from it. The program should not be allowed to apply any changes to the underlying database. Currently I read from the database with 5 JDBC sql queries and set the results then on an object. I'm now looking for a less code intensive way. Another goal is the learning aspect. Is Hibernate suitable for this task, or is there another ORM framework that better fits my requirement?

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  • PHP OOP: Unique method per argument type?

    - by sunwukung
    I'm writing a little homebrew ORM (academic interest). I'm trying to adhere to the TDD concept as a training exercise, and as part of that exercise I'm writing documentation for the API as I develop the class. Case in point - I'm working on a classic "getCollection" type mapper class. I want it to be able to retrieve collections of asset X (let's say blog posts) for a specific user, and also collections based on an arbitrary array of numeric values. So - you might have a method like any one of these $User = $UserMapper->load(1); $ArticleCollection = $ArticleMapper->getCollection(range(10,20)); $ArticleCollection = $ArticleMapper->getCollection($User); $ArticleCollection = $ArticleMapper->getCollection($User->getId()); So, in writing the documentation for the getCollection method - I want to declare the @param variable in the Docblock. Is it better to have a unique method for each argument type, or is it acceptable to have a method that delegates to the correct internal method/class based on argument type?

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  • filter queryset based on list, including None

    - by jujule
    Hi all I dont know if its a django bug or a feature but i have a strange ORM behaviour with MySQL. class Status(models.Model): name = models.CharField(max_length = 50) class Article(models.Model) status = models.ForeignKey(status, blank = True, null=True) filters = Q(status__in =[0, 1,2] ) | Q(status=None) items = Article.objects.filter(filters) this returns Article items but some have other status than requested [0,1,2,None] looking at the sql query : SELECT [..] FROM `app_article` LEFT OUTER JOIN `app_status` ON (`app_article`.`status_id` = `app_status`.`id`) WHERE (`app_article`.`status_id` IN (1, 2) OR `app_status`.`id` IS NULL) ORDER BY [...] the OR app_status.id IS NULL part seems to be the cause. if i change it to OR app_article.status_id IS NULL it works correctly. How to deal with this ? Thanx.

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  • Any ORMs that easily support access to raw table schema?

    - by fizil
    I work with a ASP.NET UI framework that pulls fields for a particular screen off a database. These fields can be associated with particular data fields in another database for binding. The idea with this setup is that if a client needs a new column on a table, they can easily add it, and create a UI field that binds to it without any sort of application restart or recompile. The problem I've always had with this is that it has meant I'm always having to work with untyped datasets in my code. Are there any ORM libraries for .NET out there that could easily accommodate the requirement of being able to access arbitrary columns in the table schema over and above ones mapped to strongly typed fields?

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  • Is there a Ruby on Rails framework like equivalent for .NET development?

    - by wgpubs
    Answers like ASP.NET MVC or Entity Framework really aren't acceptable as they address just one aspect of the problem domain. I'm looking for a framework ... a REAL framework that gives me the same features out of the box that Rails does. As such it should include at minimum: MVC for presentation ORM Ability to provide simple configuration for whatever environment (dev, QA, Production, etc...) Migration like functionality Ability to generate code in all layers (similar to scaffolding like behavior, etc...) Project template so as to create similar functionality as the "rails my_app" command. Thanks.

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  • Weird error: [Semantical Error] line 0, col 75 near 'submit': Error: 'submit' is not defined.

    - by luxury
    My controller like: /** * @Route("/product/submit", name="product_submit") * @Template("GaorenVendorsBundle:Product:index.html.twig") */ public function submitAction() { $em = $this->getDoctrine()->getManager(); $uid = $this->getUser()->getId(); $em->getRepository( 'GaorenVendorsBundle:Product' )->updateStatus( $uid, Product::STATUS_FREE, Product::STATUS_PENDING ); return $this->redirect( $this->generateUrl( 'product' ) ); } and the repo like: class ProductRepository extends EntityRepository { public function updateStatus($uid, $status, $setter) { $st = $this->getEntityManager()->getRepository( 'GaorenVendorsBundle:Product' ) ->createQueryBuilder( 'p' ) ->update( 'GaorenVendorsBundle:Product', 'p' ) ->set( 'p.status', ':setter' ) ->where( 'p.status= :status AND p.user= :user' ) ->setParameters( array( 'user' => $uid, 'status' => $status, 'setter' => $setter ) ) ->getQuery() ->execute() return $st; } when request the "submit" action, it prompts me "[Semantical Error] line 0, col 75 near 'submit': Error: 'submit' is not defined. ". "submit" is nothing to do with DOCTRINE orm query, why it appears in the error? I just can't figure out.Anyone could tell me?

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  • Filtering across two ManyToMany fields

    - by KVISH
    I have a User model and an Event model. I have the following for both: class Event(models.Model): ... timestamp = models.DateTimeField() organization_map = models.ManyToManyField(Organization) class User(AuthUser): ... subscribed_orgs = models.ManyToManyField('Organization') I want to find all events that were created in a certain timeframe and find the users who are subscribed to those organizations. I know how to write SQL for this (it's very easy), but whats the pythonic way of doing this using Django ORM? I'm trying as per below: orgs = Organization.objects.all() events = Event.objects.filter(timestamp__gt=min_time) # Min time is the time I want to start from events = events.filter(organization_map__in=orgs) But from there, how do I map to users who have that organization as a subscription? I'm trying to map it like so: users = User.objects.filter(subscribed_orgs__in=...

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  • How can I transfer files to a Kindle Fire with a Micro-USB cable?

    - by Jeff
    I'm running Ubuntu 11.10, and when I connect my Kindle Fire to my computer via micro usb, it is not recognized automatically. Other usb devices, such as my ipod and digital camera, are recognized just fine. It does not appear to be a usb power issue, since the Kindle Fire wakes up from sleeping when it is plugged in. I never get the message on the Kindle telling me it is ready to accept files from the computer, though. Here are the last 15 lines of dmesg after plugging the kindle in: jeff@prime:~$ dmesg | tail -n 15 [45918.269671] ieee80211 phy0: wl_ops_bss_info_changed: arp filtering: enabled true, count 1 (implement) [45929.072149] wlan0: no IPv6 routers present [46743.224217] usb 1-1: new high speed USB device number 5 using ehci_hcd [46743.364623] scsi8 : usb-storage 1-1:1.0 [46744.366102] scsi 8:0:0:0: Direct-Access Amazon Kindle 0001 PQ: 0 ANSI: 2 [46744.366356] scsi: killing requests for dead queue [46744.372494] scsi: killing requests for dead queue [46744.384510] scsi: killing requests for dead queue [46744.392348] scsi: killing requests for dead queue [46744.392731] scsi: killing requests for dead queue [46744.396853] scsi: killing requests for dead queue [46744.397214] scsi: killing requests for dead queue [46744.400795] scsi: killing requests for dead queue [46744.401589] sd 8:0:0:0: Attached scsi generic sg2 type 0 [46744.407520] sd 8:0:0:0: [sdb] Attached SCSI removable disk And here are my mounted filesystems: jeff@prime:~$ df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 298594984 174663712 108763480 62% / udev 1407684 4 1407680 1% /dev tmpfs 566924 896 566028 1% /run none 5120 0 5120 0% /run/lock none 1417308 300 1417008 1% /run/shm /home/jeff/.Private 298594984 174663712 108763480 62% /home/jeff I should note that, since I got Dropbox working on my Kindle, the usb is no longer strictly necessary, but as a matter of principle I'd love to get it working.

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  • What's the default traditional Chinese font?

    - by janoChen
    The only fonts that can render Chinese text are: WenQuanYi Micro Hei, WenQuanYi Micro Hei Mono, Droid Sans (I think is unicode), FreeSans (I think is unicode too). Changing Chinese text to Sans, FreeSans, Droid Sans render the same font). WenQuanYi Micro Hei, WenQuanYi Micro Hei Mono render 'bolder' Chinese text. EDIT: What I discovered so far: Is not WenQuanYi Micro Hei, WenQuanYi Micro Hei, Droid Sans Fallback (Droid with CJK support). It can only be FreeSans, or Deja vu Sans. I'm not sure which one is being used as default one (clean installation) Any idea?

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  • Calculators and C#

    - by Alon
    Does those calculators have some type of a processor like a computer? Is it possible to program to them? And finally, is it somehow possible to run the .NET Micro Framework on it? Thank you.

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  • HSQLdb permissions regarding OpenJPA

    - by wishi_
    Hi! I'm (still) having loads of issues with HSQLdb & OpenJPA. Exception in thread "main" <openjpa-1.2.0-r422266:683325 fatal store error> org.apache.openjpa.persistence.RollbackException: user lacks privilege or object not found: OPENJPA_SEQUENCE_TABLE {SELECT SEQUENCE_VALUE FROM PUBLIC.OPENJPA_SEQUENCE_TABLE WHERE ID = ?} [code=-5501, state=42501] at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:523) at model_layer.EntityManagerHelper.commit(EntityManagerHelper.java:46) at HSQLdb_mvn_openJPA_autoTables.App.main(App.java:23) The HSQLdb is running as a server process, bound to port 9001 at my local machine. The user is SA. It's configured as follows: <persistence-unit name="HSQLdb_mvn_openJPA_autoTablesPU" transaction-type="RESOURCE_LOCAL"> <provider> org.apache.openjpa.persistence.PersistenceProviderImpl </provider> <class>model_layer.Testobjekt</class> <class>model_layer.AbstractTestobjekt</class> <properties> <property name="openjpa.ConnectionUserName" value="SA" /> <property name="openjpa.ConnectionPassword" value=""/> <property name="openjpa.ConnectionDriverName" value="org.hsqldb.jdbc.JDBCDriver" /> <property name="openjpa.ConnectionURL" value="jdbc:hsqldb:hsql://localhost:9001/mydb" /> <!-- <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)" /> --> </properties> </persistence-unit> I have made a successful connection with my ORM layer. I can create and connect to my EntityManager. However each time I use EntityManagerHelper.commit(); It faila with that error, which makes no sense to me. SA is the Standard Admin user I used to create the table. It should be able to persist as this user into hsqldb.

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  • New to MVVM - Best practices for seperating Data processing thread and UI Thread?

    - by OffApps Cory
    Good day. I have started messing around with the MVVP pattern, and I am having some problems with UI responsiveness versus data processing. I have a program that tracks packages. Shipment and package entities are persisted in SQL database, and are displayed in a WPF view. Upon initial retrieval of the records, there is a noticeable pause before displaying the new shipments view, and I have not even implemented the code that counts shipments that are overdue/active yet (which will necessitate a tracking check via web service, and a lot of time). I have built this with the Ocean framework, and all appears to be doing well, except when I first started my foray into multi-threading. It broke, and it appeared to break something in Ocean... Here is what I did: Private QueryThread As New System.Threading.Thread(AddressOf GetShipments) Public Sub New() ' Insert code required on object creation below this point. Me.New(ViewManagerService.CreateInstance, ViewModelUIService.CreateInstance) 'Perform initial query of shipments 'QueryThread.Start() GetShipments() Console.WriteLine(Me.Shipments.Count) End Sub Public Sub New(ByVal objIViewManagerService As IViewManagerService, ByVal objIViewModelUIService As IViewModelUIService) MyBase.New(objIViewModelUIService) End Sub Public Sub GetShipments() Dim InitialResults = From shipment In db.Shipment.Include("Packages") _ Select shipment Me.Shipments = New ShipmentsCollection(InitialResults, db) End Sub So I declared a new Thread, assigned it the GetShipments method and instanced it in the default constructor. Ocean freaks out at this, so there must be a better way of doing it. I have not had the chance to figure out the usage of the SQL ORM thing in Ocean so I am using Entity Framework (perhaps one of these days i will look at NHibernate or something too). Any information would be greatly appreciated. I have looked at a number of articles and they all have examples of simple uses. Some have mentioned the Dispatcher, but none really go very far into how it is used. Anyone know any good tutorials? Cory

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