I have a generic class that is also a mapped super class that has a private field that holds a pointer to another object of the same type: @MappedSuperclass public abstract class MyClass<T extends MyIfc<T>> implements MyIfc<T> { @OneToOne() @JoinColumn(name = "previous", nullable = true) private T previo...
I have an object which is added to an objectContext .. after some operation i need to pass it to another objectcontext of the same database but i always face this message : An entity object cannot be referenced by multiple instances of IEntityChangeTracker. i need to change tracking information be detach it from the old object and...
I was looking for a good lightweight framework for php development, I saw symfony, cake, and CI, and found sapphire from silverstripe and I was wondering if anyone has actually used it or if it is just a scam for using silverstripe. Your comments are very appreciated. ...
i have a table like this one: id | name | score mapped to a POJO via XML with Hibernate. The score column i only need in oder by - clauses in HQL. The value for the score column is calculated by an algorithm and updated every 24 hours via SQL batch process (JDBC). So i dont wanna pollute my POJO with properties i dont need at runtime....
Please bear with me for a moment as I try to explain exactly what I would like to achieve. In my Ruby on Rails application I have a model called Page. It represents a web page. I would like to enable the user to arbitrarily attach components to the page. Some examples of "components" would be Picture, PictureCollection, Video, VideoC...
I have a problem trying to map an inheritance tree. A simplified version of my model is like this: @MappedSuperclass @Embeddable public class BaseEmbedded implements Serializable { @Column(name="BE_FIELD") private String beField; // Getters and setters follow } @MappedSuperclass @Embeddable public class DerivedEmbedded exten...
I am using NHibernate with NHibernate.Linq, and have a bunch of dynamically loading modules each with their own POCO's and Mappings (ClassMap<POCO>). I have created OData services before, but normally with a datacontext and IQueryable as Properties/Getters. What I want is to create the service by passing in IEnumerable, into the constr...
This is probably pretty simple, but here: Say I've got two models, Thing and Tag class Thing < ActiveRecord::Base has_and_belongs_to_many :tags end class Tag < ActiveRecord::Base has_and_belongs_to_many :things end And I have an instance of each. I want to link them. Can I do something like: @thing = Thing.find(1) @tag = Ta...
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 ...
Hello everybody, I've now a Problem with the newest Version of KohanaPHP (kohanaphp.com). After I've registered me and logged in into my test page, some minutes later, there is now the error: ErrorException [ Notice ]: Undefined index: id MODPATH/orm/classes/kohana/orm.php [ 1316 ] 1311 * 1312 * @return mixed primary key 1313 ...
We currently run an ecommerce solution for a leisure and travel company. Everytime we have a release, we must bring the ecommerce site down as we update database schema and the data access code. We are using a custom built ORM where each data entity is responsible for their own CRUD operations. This is accomplished by dynamically gene...
What is second level cache in hibernate ? ...
Consider a database(MSSQL 2005) that consists of 100+ tables which have primary keys defined to a certain degree. There are 'relationships' between tables, however these are not enforced with foreign key constraints. Consider the following simplified example of typical types of tables I am dealing with. The are clear relations between t...
I have a long list of links that I spit out using the below code, total votes, submitted by, the usual stuff but I am not 100% on how to determine if the currently logged in user has voted on a link or not. I know how to do this from within my view but do I need to alter my below view code or can I make use of the way templates work to ...
It is easy to setup Datamapper with a Sqlite3 in memory database with: DataMapper.setup :default, 'sqlite3::memory:'. However, when testing, I'd like to destroy the whole in memory database after each test, instead of invoking automigrate! as a shortcut on dropping everything. Is it possible? Or is it enough to set the default repositor...
Here is my simplified model: class Item(models.Model): pass class TrackingPoint(models.Model): item = models.ForeignKey(Item) created = models.DateField() data = models.IntegerField() class Meta: unique_together = ('item', 'created') In many parts of my application I need to retrieve a set of Item's and a...
I know this same question was asked for Entity Framework 1, but now that Entity Framework 4 has come out, and Microsoft claims that it provides all of the features of Linq to Sql + more, does Entity Framework now support lazy loading expensive properties? In Linq to Sql, this is extremely easy. There's a Delay Loaded option on any prop...
Environment: JPA 1, Hibernate 3.3.x I have an JPA entity class (User), how do I selectively fetch member variables say (first_name, last_name) instead of fetching all user attributes using the JPA api. ...
I have the following map. I wish to map BasketItem to the class "Product". So basically when i iterate thru the basket i can get the product name <class name="BasketItem" table="User_Current_Basket"> <id name="Id" type="Int32" column="Id" unsaved-value="0"> <generator class="identity"/> </id> <property name="ProductId" column="Item_ID" ...
Say I have 5 tables, tblBlogs tblBlogPosts tblBlogPostComment tblUser tblBlogMember BlogId BlogPostsId BlogPostCommentId UserId BlogMemberId BlogTitle BlogId CommentText FirstName UserId PostTitle BlogPostsId BlogId ...