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Taking the typical products / categories many-to-many relationship you'd typically have a relationship like follows:
table -- ProductsCategories column - ProductId column - CategoryId
Is it ill advised to add other properties to that relationship, things...
Started by Kyle West on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
A many to many relationship is simply a table with 2 one to many relationships, think of it as 3 tables with 2 relationships rather than 2 tables with a relationship and data associated a timestamp field so that I know when....
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I have the Order table which contains information about a specific order, (when does it start, how many people, etc...) and that Order table has To-Many relationship to Menu Item table. I call that relationship "orderItems".
The compiler gives me warning...
Started by Hoang Pham on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Just open your xcdatamodel in XCode, click the existing relationship, and check.
You define a one-to-one relationship - one car to one driver an inverse is simple.
Have two tables - Cars and Drivers.
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Today somebody told me that interface implementation in C# is just "Can-Do" relationship, not "Is-A" relationship. This conflicts with my long-time believing in LSP(Liskov Substitution Principle). I always think that all inheritance should means "Is-A...
Started by Morgan Cheng on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
I wouldn't get too hung up about framework use interfaces to designate... .
For example, as you can define parameters as interfaces, types that implement, and sometimes they can represent more of a normal "is-a" relationship.
An Is-A relationship.
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I currently have a user's table which contains a one-to-one relationship for Youtube OAuth tokens. However, I now want to support multiple video sites and want to break this into a one-to-many relationship.
I have setup the new tables:
tokens - cols: ...
Started by Matt McCormick on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
That also makes.
For a one-to-many relationship, you just need a user_id field in the tokens table.
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I have a many to many relationship between a Team and an Employee entity.
I mapped them as following:
public class EmployeeMap : ClassMap<Employee> { public EmployeeMap() { // identifier mapping Id(p => p.Id).Column("EmployeeID"); // column mapping...
Started by Rookian on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
I have answered a similar question here: http://stackoverflow.com/questions/1695063/what-is-the-correct-way....
Use Cascade.SaveAndUpdate instead, if you wish to avoid the delete cascade action .
Hi! Because of the Cascade.All on the HasManyToMany mapping.
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I the School class I have this code:
from student in this.Students where student.Teacher.Id == id select student
The Student class there are two relationships: Teacher and School. In the School class I'm trying to find out all the students whose Teacher...
Started by J. Pablo Fernández on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
}
I guess that this.Students is....
For example:
using (YourDataContext db = new YourDataContext()) { var query = from s in db.Students.Include("Teacher") where s.Teacher.ID == 1 select s; //etc.. .
The Include clause can be used in linq to entities query .
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In java we can use instanceOf keyword to check the isA relationship. But is it possible to check hasA relationship too?
Started by Rakesh Juyal on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
The hasA relationship is often modeled as a private variable in a class:
Public.
Of approaching the task.
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Possible Duplicate:
Surrogate Vs. Natural/Business Keys
The title says it all.
If given two tables, Level1 [ID, Title, Number] Level2 [ID, FKID???, Title, Number]
A user of the system understands that Level2 is related to Level1 with based on Level1's...
Started by Nate Bross on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
In an extreme case, such an artificial relationship may be....
Tables in a natural way, I would not force the relationship based on an internal (surrogate) key a relationship from one system generated #, to another system generated #.
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Confused about relationship/sexuality
Details: This is the first long term relationship for either of us because we started dating in high school, so it's hard for either of us to feel extremely confident that our relationship is better than others that...
Answer Snippets (Read the full thread at metafilter):
I don't think it's trivial to break up the relationship over this issue, but I also, and not being turned on by your ....
Sex life? I think the question of your relationship is less about whether you're straight or lesbian, and complicated.
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In a software system a one-to-one relationship must be modeled between two objects where an active status exists for the relationship.
In other words, ObjectA has a one-to-one relationship to ObjectB (without a back pointer) where the relationship can...
Started by sduplooy on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
"There might also be additional attributes associated with the relationship."
So in simple situations, where the relationship....
It depends if the activation of a relationship is part of the behavior of the system you want to model.
Otherwise.
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