Is it possible somehow to do multiplie one-to-many relationships between 2 tables? Like: Table abc abcID defID message Table def defID abcID message If yes how can I then make a new abc entry with the entity framework? ...
Title says it all :) Thanks ;) ...
Is it possible in Doctrine for 2 tables to share more than one relationship based on different columns? Also does Doctrine support a ternary relationship? Thanks in Advance ...
Here is my question. I have this model one [Event] has multiple [Day] and there is a relationship called days in [Event] and there is a reverse relationship event in [Day]. Now I want pass the Event object and get all days using NSFetchedResultsController and feed all days in the table. Here is my code: // Create the fetch request for ...
Good morning, I'm trying to figure out the best way to manage this user situation I've got. I have users and affiliates. There is already a HABTM relationship between the two of them, because users can sign up for affiliates, and affiliates can reach out and touch users, in order to get various data points. Now I need to set up a new...
I currently have a code table containing a list of types (Type_ID, Description), but they are saved in another table as ID;;ID;;ID...etc I am looking for a script that will take those ID's and place them in a relationship table corresponding to there Type ID For example in table A the Type_ID entries could look like: 1;;2;;4 1 ...
Why can i remove elements of a bidirectional relation although only one side of the relation is managed in persistence context (Example I)? When i have an unidirectional Relationship that doesn't work (see Example II). Why? Entities: @Entity Class User { ... @OneToMany(mappedBy = "user") private List<Process> processes; ...
Using Core Data. Let's say we have models for Team and Player. Assume: -Each player is a member of a single team -Relevant relationships have been made in a xcdatamodel file. I have a TeamListViewController (listing all teams), when I select a team I want to see a list of just those players related to that selected team on the PlayerLi...
I have a OneToOne relationship like this :- Person Others ----------- ------------- | id (PK) | <----------------->| id(PK)(FK) | ----------- ------------- | name | |.... | | address | |.... | | .... | ...
I have a core data model with blog groups, blogs, and posts. A blog group has a to-many relationship to blogs, and each blog has a to-many relationship to posts. A post has an attribute "hasBeenRead." Both the blog and the blog group have a attributes "numberUnreadPosts." I'd like to know the best practice for propagating the numbe...
Hi, I'm trying to do a many-to-many relationship on Grails 1.3.4 and I'm getting this exception: Caused by: org.codehaus.groovy.grails.exceptions.GrailsDomainException: No owner defined between domain classes [class gblog.Post] and [class gblog.Comentario] in a many-to-many relationship. Example: static belongsTo = gblog.Comentario ...
I am having a hard time wrapping my head around data models. Let me start with showing how I would declare the class if I just had to have in-memory objects. @interface PlayerState { NSSet /* of SavedDie */ *savedDice; NSSet /* of SavedDie */ *immediateRolls; } @property (nonatomic, retain) NSSet *savedDice; @property (nonatomic,...
I'm working on a database for stat keeping for a sports club where I help administrate some events. I think I've got the parts for keeping track of the competitor names, classifications, categories, etc. figured out using a main table, several lookup tables and a couple bridge tables to cover the many-to-many relationships involved. I ...
I'm posting this question which is somewhat a summary of my other question. I have two databases: 1) db_users. 2) db_friends. I stress that they're stored in separate databases on different servers and therefore no foreign keys can be used. In 'db_friends' I have the table 'tbl_friends' which has the following columns: - id_user - id_...
You can take a look at the app I'm referring to at: http://github.com/585connor/QA So, I've built this question & answer app... kind of. I can get the answers to be listed on their respective questions but I cannot figure out how to get the user info to be displayed on those questions/answers. For example I'd like to put the username ne...
Quick question: If I have a one-to-many relationship, such as this: class SalesPerson < ActiveRecord::Base has_many :deals end class Deal < ActiveRecord::Base belongs_to :sales_person end how can I delete a Sales Person, without negatively impacting the deals associated with them? The use-case for this would be if someone left ...
The title may be not exactly, but I don't know how to express it. I have 3 class: User, Question, Answer. The simple code is: Session = scoped_session(sessionmaker()) Base = declarative_base() class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) questions = relationship('Question', backref="use...
Hi, I encounter problems while trying to implement GWT JDO features. Let's say there is a Data object that contains an Item object. In the datastore this would create a one-to-one relationship. The problem is that when I try to get the object from the datastore, the 'item' field is always null. Of course I put the object to the datas...
Okay, so for whatever reason I have ended up with a situation where the key is pointing the wrong way in a one-to-many. It was obviously never used as a one-to-many, only as a one-to-one, and now there is a need to expand one of those to be many, and the way the key was stored this turned out to be backwards. The images table has a t...
I need to carryout a data capture exercise, which is looking like a large task, that unfortunately may end up being done in excel. I believe a database is more suitable, but the structure of it is probably very complicated. I've created 4 categories per Unit (30 units). Each category has 8 graphs/dimensions. Each graph/dimension has a s...