foreign-key-relationship Questions
2
Solved
In the Datomic Schema doco - they mention a schema attribute called db/isComponent. This appears to refer to relationships defined by :db.type/ref.
The db/isComponent isn't used in the Seattle ex...
Lore asked 23/3, 2013 at 12:34
3
Solved
I think this should be simple, but I can't figure out how to do it. Suppose I have the following maps:
public class AnimalMap : ClassMap<Animal> { Id( x => x.Id); }
public class CatMap: ...
Den asked 21/6, 2010 at 12:57
1
Solved
I have a couple of models:
class Customer(models.Model):
customer_name = models.CharField(max_length=200)
def __unicode__(self):
return self.customer_name
class Meta:
ordering = ('customer_...
Underplot asked 17/4, 2013 at 21:45
2
Solved
I'm unable to grasp that from the docs. It's totally unclear to me, more specifically:
Is it a global setting? So if I specify this attribute it on one of the model managers, will it be used glob...
Keeler asked 20/5, 2011 at 3:36
1
Solved
I have never used Liquibase before and just can't figure out how to solve this problem. The project I recently joined is a remake of an old project, so we have to stick with an old database, which ...
Giagiacamo asked 11/3, 2013 at 16:19
2
Solved
I have a document entity mapped many to one to project entity.
When I call document.getProject, in debugger, in project field of document object I see something about Project$$EnhancerByCGLIB$$67a...
Craft asked 9/11, 2011 at 9:15
2
Solved
I am trying to delete a few records but am getting the following error:
Cannot delete or update a parent row: a foreign key constraint fails
The thing is, the foreign key constraint is failin...
Yasmeen asked 8/8, 2011 at 6:6
1
Solved
As mentioned here I'm building a custom hydration strategy to handle my related objects in a select box in a form.
My form looks like this:
$builder = new AnnotationBuilder($entityManager);
$form...
Pretender asked 3/1, 2013 at 16:0
2
Solved
I'm looking for a way of adding an association between two entities and having a settable Id for the foreign key. I have searched through previous posts, but the closest I can find is a suggestion ...
Kainite asked 14/8, 2012 at 15:39
3
Solved
what is the recommended way to handle self-referencing foreignkey constraints in SQL-Server?
Table-Model:
fiData references a previous record in tabData. If i delete a record that is referenced...
Lotte asked 24/3, 2011 at 9:13
1
I inherited a SQL Server database that has a table with a primary key named RecordID. The table definition and the foreign key defined like this:
CREATE TABLE [dbo].[MyTable](
[RecordId] [int] ID...
Getup asked 2/10, 2012 at 4:56
2
Solved
i know you will say that this question is asked before many times but i havent solved it yet...
models.py
class Doc(UploadModel):
doc_no = models.CharField(max_length=100, verbose_name = "No", ...
Period asked 5/9, 2012 at 12:57
1
Solved
Using SQL Server 2008 R2 I am trying to establish a relationship between two companies. For the sake of illustration; one table is called 'company', another is called 'branch'. Company and branch b...
Kessiah asked 24/7, 2012 at 11:1
2
Solved
I'm finding django foreign keys a bit confusing, is there any way to do the view below, using a single query?
# Model
class Programme(models.Model):
name = models.CharField(max_length = 64)
clas...
Englebert asked 2/3, 2010 at 23:34
2
Solved
I have "days" table created as follows
"create table days(" +
"day_id integer primary key autoincrement, " +
"conference_id integer , " +
"day_date text, " +
"day_start_time text, " +
"day_en...
Huberman asked 23/5, 2012 at 11:58
2
Solved
I have a set of tables that look like:
workflows = Table('workflows', Base.metadata,
Column('id', Integer, primary_key=True),
)
actions = Table('actions', Base.metadata,
Column('name', String,...
Canasta asked 9/5, 2012 at 23:57
8
Solved
I think the following example will explain the situation best.
Let's say we have the following table structure:
-------------------------------------
Member1 int NOT NULL (FK)(PK)
Member2 int NOT ...
Myoglobin asked 14/3, 2012 at 16:56
2
Solved
Say I have a SqlAlchemy model something like this:
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, String, Integer, ForeignKey
from sqlalchemy.orm import ses...
Sennar asked 31/1, 2012 at 18:36
2
Solved
I am wondering if there is a best coding practice in regard to dealing with IDs for parent > child objects in the code, where the DB records use an auto incremented int as the ID (on the initial sa...
Artery asked 2/2, 2012 at 11:34
1
Solved
I have table 1 with a primary key user_id and table 2 where user_id is a foreign key.
Only 1 record per user_id can exist in table 2, and no record can exist without it.
QUESTION: Can user_id in ...
Vandervelde asked 20/1, 2012 at 23:9
2
i'm starting now on Rails, i looked in the forum, but i didn't find anything that could solve my problem.
Here it goes, I have a Category table, and it has only name for a column (there is no rep...
Upi asked 30/11, 2011 at 23:36
2
Solved
Possible Duplicate:
MySQL Relationships
I am trying to create a one to many relationship in MySQL with foreign keys.
Two tables, user and location. Each user can have many locations,...
Auberta asked 21/11, 2011 at 19:57
1
Solved
I know a lot of people is asking about one-to-one relationships on EF 4.1 but I can't seem to find an answer for this problem.
I have these POCO classes:
public class Contact
{
public decimal nC...
Salesmanship asked 4/11, 2011 at 20:0
2
In the application I am building, users can specify relationships between tables.
Since I only determine this at runtime, I can't specify has_many or belongs_to relationships in the schema module...
Formate asked 13/2, 2010 at 1:28
2
Solved
Imagine a schema as such.
NOTE TABLE: NoteID, Note, DetailedTaskID, .....
DETAILED TASK TABLE: DetailedTaskID, WorkOrderID, .....
WORKORDER TABLE: WorkOrderID, ProjectID, .....
PROJECT TABLE: P...
Cerated asked 13/10, 2011 at 2:30
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