relation

Get Table2 data from a relation to Table1 in C# Code

I have two tables in a DataSet where the ID field on each is the same. I have a Relation between the two tables. How do I, in C# code, pull the info from Table2 that relates to the info on Table1? I have tried using a new DataRow and assigning it by using GetChildRow, but for some reason I cannot seem to make it work. Also, I understan...

UML Class diagram Relation type

I have two classes, but don't what kind of relation i should use. I have a class Document with a lot properties and no methods. The second class is what i called the DocumentFact (Fact - Factory). This class contains different methods which returns a collection of Document objects. So, the Document class doesn't know anything about the ...

how to copy sql table relation to remote database

I'm using sql management studio 2005. When i copy all tables to remote database using Import tool, relation dont copy. How to copy tables with relation. ...

How to optimize m:n relation query on 3 tables

Hello, this is my sql problem - there are 3 tables: Names Lists ListHasNames Id Name Id Desc ListsId NamesId =-------- ------------ ---------------- 1 Paul 1 Football 1 1 2 Joe 2 Basketball 1 2 3 Jenny 3 Ping Pong 2 ...

Django: Retrieve active threads by the time the last Post was created

Hallo people, I have two Models, Thread and Post, where one Thread can have many Posts. I want to retrieve the active threads by sorting by 'post_set.createtime'. In the end, I want to get exactly ten Threads that had the most recent activity. Is this possible using no own SQL? Thanks a lot in advance. [Copying the model definitions f...

Represent Many-Many relationship in a WPF listbox

Hi i want to represent a many to many relation in my wpf appliaction.I want to fill a combobox in my listbox according to a relation.But my parent table does not contain a primary key.So i am not able to add a relation also.My tables are as follows Tests Table(no PK) ............ Id TestName Sample 1 Test1 Blood 1 ...

Retrieving dependent/parent from within domain entity method

How would one go about retrieving a dependent/parent object from an entity. $person->getAddress(); This should retrieve the Address object for that person from the database and return it as an object. Is this a good way to do it and how should the code look like if this is ok to do. Doing this would mean that the object itself should...

core data iphone readonly relation

Hi, I have situation where I dont want to add records to the relation table. For example : I have "TRIPS" entity and it has attribute for "LOCATION_ID", I am filling it when user creates a new TRIP and select a LOCATION from the LOCATIONS entity In "LOCATIONS" entity I am allowing user to create locations and I am assigning a unique ...

Problem with updating entity relation using stub entities

EDIT: Stub Entities Definition I have two entity types Subscriber and AddOn Their definition in data model is as below Subscriber(#SubscriberID,Name,AddOnID) AddOn(#AddOnID,Name) AddOnID column in the Subscriber table references the AddOnID column in AddOn table. I'm trying to update the AddOn reference of a specific Subscriber ...

how to dump mysql table relations in PHP

Hi all; I searched a lot but could not find a way to dump table relations like one-to-one, one-to-many vs in PHP. Is there a way to handle this issue in PHP? A result might be: array( 'tableA' => array( 'one-to-one' => array('tableB', 'tableC'), 'one-to-many' => array('tableD'), 'tableB' => arra...

Core Data: re-setting to-many relationship

Hi, I have created model which you can see there: http://i.imagehost.org/0836/2009-11-08%5F14%5F37%5F41.png I want to store information about sound categories and some sample sounds for each category. Category has Name (NSString) and SoundsRelation (NSSet of NSData, which represents sounds). Here is the problem: For example I have som...

Integer Relation Implementation (finding ratio between real numbers)

Can anyone point me to a library or module with a decent integer relation implementation (most likely PSLQ)? My target platform is .NET (C#), but if there's source code in C/C++, Java, whatever, even a semi-comprehensible algorithm, that would help me a lot. All I was able to find on Google was some unreadable Mathematica code. I was ...

How to specify an association relation using declarative base

I have been trying to create an association relation between two tables, intake and module . Each intake has a one-to-many relationship with the modules. However there is a coursework assigned to each module, and each coursework has a duedate which is unique to each intake. I tried this but it didnt work: intake_modules_table = Tabl...

[iPhone] Objective-C : Relationship to own class (CoreData)

Hey folks! In my project there is a managed object called "Group". This object itself can contain child group objects. How do I solve this situation in CoreData and in the FetchedResultsController? My first shot: http://i46.tinypic.com/zvonpd.png Thanks, Dan ...

How to make a relation between tables using SQLAlchemy?

Using SQLAlchemy, given tables such as these: locations_table = Table('locations', metadata, Column('id', Integer, primary_key=True), Column('name', Text), ) players_table = Table('players', metadata, Column('id', Integer, primary_key=True), Column('email', Text), Column('password', ...

A function of a slider value suitable for zooming

I'm using the jquery ui slider for zooming. It's supposed to zoom from 25% to %500, and about half of the range is used for the first %100 of the size. The slider has values from 1 to 100. I need some function that can be used to calculate zooming based on the slider value, e.g. function getZoom(sliderVal) { //return number from 25...

Django - ManyToOne relation to a child class

Hi! Is there a way to declare this case so that it works? I hope the code is self-explanatory. class A(Model): many_to_one = models.ForeignKey(B) (...) class B(A): (...) ...

Starter question of declarative style SQLAlchemy relation()

I am quite new to SQLAlchemy, or even database programming, maybe my question is too simple. Now I have two class/table: class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) name = Column(String(40)) ... class Computer(Base): __tablename__ = 'comps' id = Column(Integer, primary_key=Tr...

sqlalchemy relation through another (declarative)

Is anyone familiar with ActiveRecord's "has_many :through" relations for models? I'm not really a Rails guy, but that's basically what I'm trying to do. As a contrived example consider Projects, Programmers, and Assignments: from sqlalchemy import create_engine from sqlalchemy.orm import sessionmaker from sqlalchemy import Column, Fo...

Rails Model Relationship: Has one but also belongs to many

I have two Models, Modela and Modelb. Modela can only own one Modelb, but Modelb can be a part of many Modela's. What I have right now is class Modela < ActiveRecord::Base has_one :modelb end class Modelb < ActiveRecord::Base belongs_to :modela, :foreign_key => "modela_id" #might not make sense? end Not too sure about the whole...