Select All Rows Using Entity Framework

Entity Framework selects a single row value.

I am using Entity Framework from .NET 3.5...I have two tables with 0-1 to many relation. Let's say Citizen and City. Each citizen has foreign key column (ID) that connects him to City....When i select single citizen, i also need to select the name of the city where he lives. Because city table contains tons of data that is not really related to cit...

Using Entity Framework to insert many rows into a table

I'm using entity framework 5 now.... When you use:...objectcontext.Add(yourobject1); objectcontext.Add(yourobject2); objectcontext.SaveChanges(); ...then only last of your objects will be inserted into database....But if you will use:...objectcontext.Entry(yourobject1).State = System.Data.EntityState.Added; objectcontext.Entry(yourobject2).State = ...

Row size exceeds the maximum row size of 8060 in Entity Framework.

I have an entity with a binary datatype and a corresponding ...varbinary(max)... column in SQL Server. EF creates this:...CREATE TABLE [dbo].[Attachments] ( [Id] INT IDENTITY(1,1) NOT NULL, [FileName] NVARCHAR(255) NOT NULL, [Attachment] VARBINARY(MAX) NOT NULL ); ...When I try to call ....SaveChanges()... from Entity Framework, I get ...

Select * from Entities where Id = (select max(Id) from Entities) in Entity Framework

I think from a simplicity point of view, this should be same result but faster as does not require two round trips through EF to sql server, you always want to execute query as few times as possible for latency, as the Id field is primary key and indexed, should be performant...using(var db = new DataContext()) { var maxEntity = db.Entities.OrderBy...

Entity Framework 4.1: How to choose a row(object) based on the maximum value of a field

Another way to do beside the first answer:...Profile profile = db.Profiles.OrderByDescending(p => p.RollNumber).FirstOrDefault();

Entity Framework - select group by, select max date

Entity Framework creating IQuerable of the most recent...This is what finally worked for me:... return from e in _ctx.Notes group e by e.ParentNoteId into g select g.OrderByDescending(e => e.Created).FirstOrDefault() into r select new NoteBrief { Id = r.Id, ...

Entity Framework Select Row

For some reason I can't seem to figure out how to use Entity Framework to select a single row....Here is what I have:...Database: ...ItemSchema... contains ...Defindex..., ...Name..., ...MarketPrice...I need to select the ...Name... based on a ...Defindex... I already have....So I want to match the ...Defindex... with a record, and retrieve the Nam...

How to get the latest row in a table using Entity Framework (considering performance)?

I am concerning about performance, specially on large table. In my example StatusId is a ...IDENTIY PRIMARY KEY.......I would like to know if there is a better way (faster) to get the last entry in a table.... public IQueryable<GaStatus> GetLastStatus() { return context.GaStatuses.OrderByDescending(x => x.StatusId).Take(1); }

Get single row using Entity Framework without getting all data

This line will not actually execute anything on the database:...context.tbl1.Where(obj => obj.name == "Robin Banks") ...It will return an ...IEnumerable<tbl1>... which is going to be lazily evaluated when you come to use it. To execute an actual query on the database you need to perform an enumeration on the ...IEnumerable<tbl1>... (e.g. a ...forea...

To delete a row from a table of only foreign keys using Entity Framework

I faced a similar issue and you can solve it this way. I almost tend to avoid tables with just foreign keys and instead add another column to fix this issue....var license = db.Licenses.Where(l => l.ID == LicenseId).FirstOrDefault(); var users = license.Users.ToList(); if (users != null) { foreach (var user in users) { license.Us...