MVC 2 Relation Without Foreign Key With Entity Framework 4 Or With Foreign Key?
Sep 13, 2010
1 - Is it necessary to have foreign key to obtain a Relation in Entity Framework between each entity.?
2 - I have a Language Table and many many table with a foreign key related to the language table. Is it right to add this foreign key or I should do something else ?
Ex:
Language
LangID
LangName
TableTextA
TblAID
TextInfo
LangID
TableTextB
TblBID
TextInfo
LangID
TableTextC
TblCID
TextInfo
LangID
etc ...
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Similar Messages:
Oct 18, 2010
I m try to insert record to table, its working well without foreignkey using Entity model. But i need to insert foreign key. I used the following query, its not working well via Entity model.
objFacility.FacilityCategoryReference.EntityKey =
new System.Data.EntityKey("testEntities.test",
"id", 10);
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Apr 5, 2010
How can I give set foreign key value field in Entity Framework. I have Kartlar entity (related from kartlar table). I need simple save method this field but, RehberID, KAmpanyaId,BirimID is foregin Key....
public static class SatisServicesUpdateTables
{
public static void SaveKartlar(int RehberID, int KampanyaID, int BrimID)
{
using (GenSatisModuleEntities genSatisKampanyaCtx = new GenSatisModuleEntities())
{
Kartlar kartlar = new Kartlar();
kartlar.RehberReference.EntityKey = new System.Data.EntityKey("genSatisKampanyaCtx.Rehber", "ID", RehberID);
kartlar.KampanyaReference.EntityKey = new System.Data.EntityKey("genSatisKampanyaCtx.Kampanya", "ID", KampanyaID);
kartlar.BirimReference.EntityKey = new System.Data.EntityKey("genSatisKampanyaCtx.Birim", "ID", BrimID);
kartlar.Notlar = "hfhfhfhfhfhfghfghfgfghk";
genSatisKampanyaCtx.AddToKartlar(kartlar);
genSatisKampanyaCtx.SaveChanges();
}
}
}
But it throws to me : ArgumentException was unhandled by user code link text
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Jan 3, 2011
how to handle foreign keys with Entity Framework, when editing or adding a new record. For example, I have a person table, which has a timezone_id linking to my timezone table.
But the model seems to not include timezone_id. I see it's a new way of doing things, but ... how do I store my record?
My method:
[code]...
I can't do u.timezone_id = timezoneid;
I only have u.timezone (which seems to be the actual entity), and u.timezoneReference, which I am not sure what to do with.
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Mar 2, 2010
I have 2 tables Departments {ID, DeptCode (PK), SubDeptCode (PK)} and Employee {ID, Name (PK), DeptID (PK & FK to ID in Deparments)}.
Both ID fields are declare as UNIQUE and incremental identity. It works fine in sql server 2000 but EF won't map the relation in my app.
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May 3, 2010
I developed and entity framework (.edmx) application in 4.0 in that i got all the data of my querying table and its foreign key referenced tables data also. but when i change my project to 3.5 i am unable to get the data of foreign key referenced tables data.
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Apr 6, 2010
Adding data into kartlar table (RehberID,KampanyaID,BrimID) is ok. But which Kart'ID created? I need to learn which Id created after adding data (RehberID,KampanyaID,BrimID) into Kartlar?
[code]...
How can I do that? I want to get data from Kartlar which data I added?
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Oct 12, 2010
I have a gridview displaying "registrationtype id" (FK) from the registration table. I want it to display the related name instead of the id from the registartiontype table.
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Apr 8, 2010
I'm trying to insert a new EF object containing a reference to a related table via foreign key, and cannot get the reference stored in the new object. I have two tables in a SQL Server 2008 Database:
Component Templates
PartGroups
with a Foreign Key linking them thus: ComponentTemplates:ID [0..1<->*] PartGroups:ComponentTemplateID
I have imported these tables into a .NET web application project .edmx file (using a new ADO.NET Entity Data Model), and then created a Data Service which I then reference in a Silverlight 3.0 project. The objects are available as expected in the data context called by my Silverlight app and load correctly. Now, when I try to save a reference of ComponentTemplate into a newly created PartGroup, the PartGroup object is created in the database, but the value of ComponentTemplateID in the newly created table record is NULL.
[Code]....
(Note that _ctCtrl.ComponentTemplate is a confirmed non-NULL object reference to the parent object on which PartGroup is a child)
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Jun 30, 2010
I've created a new ASP.NET website. I've generated an Entity Data Model from my database and have dropped a entitydatasource and gridview onto my page and wired up the gridview to pull from the entitydatasource. Now I get columns like this: id extension prefix did_flag len ten_id restriction_class_id sfc_id name_display building_id floor room phone_id department_id
In each case where the item is named something_id this reflects a foreign key relationship in the database - and I did choose to have the EDM expose foreign key relationships. I'd like to make it so the gridview pulls in the values for these foreign keys rather than just showing the ID numbers - so, for example, department_id might have a value of "101" right now but it should pull from the department table "Marketing".
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Dec 14, 2010
Does ADO.Net Entity Framework 3.5 support Composite Foreign key/Composite primary key?
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Feb 17, 2011
I have the following code
Customer currentCustomer = new Customer();
when i do currentCustomer. In the drop down I can see all the columns listed except one column which is a foriegn key from order table , how do i insert into intorder_fk
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Apr 21, 2010
I have a database with the structure
Client
--------------
ClientID -> PK
FistName
LastName
AddressID -> FK to Address.AddressID
and
Address
--------------
AdressID -> PK
City
CityCode
I created an initial set of address so
0 - London - 1000
1 - Paris - 2000
2 - Madrid - 3000
3 - Lisbon - 4000
I'm using Visual Studio 2008 with MVC.
Framwork to use ADO.NET to create the model
My view is:
[Code]....
My model is just: ... Private _dataModel As New just2testDBEntities
[Code]....
When post it retun erro
{"Can not insert the value NULL into column 'City', table 'dbo.Address'; column does not allow nulls. INSERT fails. ... statement terminated."}What I was intended to do is to insert a client and not a client and an address.
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Mar 6, 2010
I,am trying to create a self association relation for an organization chart data tree in Entity Framework,after trying different ways for prevention of exceptions like 3007 and etc. I found that when I put my foreign key in my POCO near Parent and Items navigation properties its work.but I think this is not correct that we have both ParentID scalar property and Parent navigation property. review this and tell me is it correct or not.I'm using VS 2010 RC and ofcource .net framework 4.0 RC
[Code]....
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Jul 9, 2010
Am trying to get a working enity model with foreign keys working but have run into a problem. I have imported 3 tables with content and some data.Lets call these tables geo_countries, geo_counties, geo_municipalities and the FK are:1. geo_county have a column country_id wich corresponds to country_id in geo_country 2. geo_municipality have a column county_id wich correspond to the county_id in geo_county.The problem i have is when i try to get correspondig child items with the following code i run into trouble:
[Code]....
The problem above is that 'test' generates results but not 'test2', wich never return anything. Am i not supposed to be able to do it like i do in 'test2'? I earlier tried to add a child object by replacing ToList() with Add() and that worked. But i cant seem to get anything out of it.
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Mar 22, 2011
I had table had data about product photos and this table had a relation to product table and product may be has more than Image. I did my code well to get all images for product by productID query string but only first image retrieved. Note that ProductID in handler page is a foreign key into the Photobank images table, also I note that productID had value of ID table didnot the productID:
stored proc:
ALTER proc [dbo].[SP_GetPhotoBank]
(
@ProductID Int
)
as
[Code].....
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Jan 8, 2011
Lets say there's a table Table1 with Primary key as "MainID" and this MainID is being used as a Foreign key in many tables.
Now when I try and delete a record from Table1 who's MainID as foreign key is being used in some child tables, then it throws this exception that "Foreign key conflict n stuff"..
Now I want to design my Delete Strored procedure in such a way that first of all checks ALL the child t ables that have that foreign key column "MainID" and if MainID from Table1 is being used in any of the child tables it should return 0 . Based on this 0 value I want an alert box to show that will say "Still in use or watever" and wont let the user delete that record unless ALL the records in child tables have been deleted that were using that mainID from table1.
I can't use ON DELETE CASCADE. I want the user to delete child table records manually one by one. Only after child table records using the MainID have been deleted that the user can delete record from Table1
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Jun 22, 2010
I've got 2 tables where each has a primary key which is also the identifier (Both fields called "id" in each table) In the "picture" table as one of the fields I've got the photoalbumid (The id of the "photoalbum" table). This field is just an int field. I'm getting the following error: "Cannot insert explicit value for identity column in table 'Picture' when IDENTITY_INSERT is set to OFF" Can anyone give me some advise? It's such a basic thing I would hope that there's just something small in the creation of the database that I've missed out. Let me know if you need more info.
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Oct 5, 2010
I've two table
a). Country
1.CountryId -PK
2. Country Name
b)City
1.CityId---PK
2.CityName
3.CountryId --FK to Country table
and my code is FWUDataContextDataContext CityContext = new FWUDataContextDataContext();
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Jul 24, 2010
I am trying to build the MVC Music Store from ASP.Net, my only problem is that the tutorial is made for asp.net 4.0 C# and mvc2 an i am creating it with asp.net 3.5 VB mvc 1. For now i found out a lot of thing wich will work much better in the new frameworks, but my webhost still doesnt support it, because they have some problemms with PLESK.
Now i have a problem i cant figure out, i cant update data from a dropdown list, in the database using the updatemodel, that are foreign keys. Just all other data wich are not foreign keys and primary keys are updateable. These are automaticly created in the sql entity model.
Here is my code.
[code]....
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Sep 10, 2010
In my databse i have a databse tables
UserRole -UserID,UserName,RoleName.
Compaign - CompaignId,Region,CompaignName,LOB.
Employee -EmpNo,EmpName,CompignId
Timesheet -TimeId,EmpNo,Date.
I dont have primary key for Compaign Table CompaignId is Identity column. Now i want to use CompaignId in Employee Table because based on compaign user will retrieve employee data in Front end. Again Employee table doesn't have primary key. I am uploading excel file data to databse but in excel file there is no empNo so i cannot use primaryKey i have EmpName in excel file. How to solve this issue. How to use master table if possible create table structure for my requirements.
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Nov 16, 2010
So I am working with a database and am trying to get my model code working.I have a situation where I have a table called accounts that for simplicity has 3 columns
accountid, accounttype, parentid
basically its a parent child relationship. if parentid is null its a parent, its not its a child of the accountid.Im running into problems getting the .edmx file mapping. parentid is a foriegn key on the table.
how can access the parentid column? i can see it in account navigation account1 but Im not sure how to get access to it in my linq query
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Jun 17, 2010
As i start to work with MVC simple things are not so simple. I have a view that renders correctly a single table of my Database (using Entitry framework created automatically by visual from my SQL database).The table show everything including the foreign key and i i seeking for replacing the foreign key by a friendly name of my foreign table.In the controleur i have the following code :
public
ActionResult Index()"Equipement"]
= new
SelectList(_entities.T_E_EQUIPEMENTS_RESEAU_EQP.ToList(),
"EQP_ID",
"EQP_NOM");
return View(_entities.T_E_CONSOMMATEURS_CSO.ToList());
both table are joined by the foreign key CSO_EQP_ID and the primary key EQP_IDI have no clue of what to define in the view ?Any exemple of this simple need will be welcome.
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Feb 22, 2011
I have an MVC3 with EF4 project. I have a screen for order .Order has 2 id's inside it for Billilng and Shipping AddressID .When I go and create a new order these fields render as single textboxes as Ids'Question is how can I render full address textboxes (addressline1,city,state,zip etc) do I have drop in the html markup for them? In that case while capturing the data back I willl have to go with classic way of retrieving name/value pair and then do insert into address bring back that identity and update the order record...?
Create(int customerID,FormCollection fc){}
So the main question is how can I do ModelBinding with foreign keys?
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Mar 10, 2011
I have two tables, which is table 'A' and table 'B'. Table B contains a foreign key that is referenced to table 'A'. The question now is, could I used an option in my project in visual studio an 'Others specify'? I believed that it's not possible, isn't it?If I have a selection that is bound to a datasource then is it possible to make an option 'Others specify' without adding the specified value to the database, which in turn would not have a unique ID? Table B contains the table A ID PK field, and all values from table A to table B should contain a unique ID.
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