Entity framework select one row
WebNov 18, 2013 · Viewed 4k times. 5. I have a configuration table in my database and it contains exactly one row. ConfirmedScheduleColor OverlappedScheduleColor ColN. Currently, I'm retrieving the configuration like this: var db = new SchedulingDbContext (); var config = db.Configurations.FirstOrDefault (); It's currently working fine and I can access … WebDec 15, 2011 · Entity Framework 4, with SQL Server 2008. Problem: I have a table Order. Each row has a column Timestamp. The user can choose some time in past and I need to get the Order closest to the specified time, but that had occurred before the specified time. In other words, the last order before the specified time. For example, if I have orders
Entity framework select one row
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WebOct 14, 2024 · The Find method on DbSet uses the primary key value to attempt to find an entity tracked by the context. If the entity is not found in the context then a query will be … WebDec 23, 2024 · 20. I need to get top 10 rows for each group in a table with entity framework. Based on other solution on SO, I tried 2 things: var sendDocuments = await context.Set .Where (t => partnerIds.Contains (t.SenderId)) .GroupBy (t => t.SenderId) .Select (t => new { t.Key, Documents = t.OrderByDescending (t2 => …
WebJan 12, 2024 · Tracking, no-tracking and identity resolution. Using SQL queries. Asynchronous programming. Additional resources. Querying efficiently is a vast subject, that covers subjects as wide-ranging as indexes, related entity loading strategies, and many others. This section details some common themes for making your queries faster, and … WebThe problem is how to get the last order if one user can have many orders. how to do it with one query without huge foreach after the entity query ? public class Order { [Key] public int OrderID { get; set; } public string IdNumber { get; set; } public int Price { get; set; } public Datetime InsuranceDate { get; set; } }
WebIf I understand correctly, you don't want to load the Author entity (because there is no way to load entity with just some non navigation properties populated).. Then the question is why did you specifically add Include(x => x.Author) which is requesting EF to load the Author.Include / ThenInclude methods support eager loading of the related data entities. WebSep 21, 2016 · The context object allows interaction with the database. Stuff like getting data from the database, saving data to the database, and putting data into objects. This line Is where the magic happens: 1. var posts = context.Posts; This one little line tells Entity Framework to go to the Posts table in the StackOverflow database, get ALL of the ...
Web2 Answers. Fix your primary key definition in your EDMX. (If your table has no PK, add one.) When all rows return the same "key", the EF returns the same object instance. Bingo. I'm using reporting tables set up by someone else and they didn't have a primary key. Thanks. Even if the developers call this a feature, I'm calling it a bug. Thanks a ...
WebMay 7, 2024 · How to select top N rows for each group in a Entity Framework GroupBy with EF 3.1 (1 answer) Problem with EF OrderBy after migration to .net core 3.1 (1 answer ... Selecting distinct rows but always select the last one. 1 get Current record selected in group by lambdada expression. 1 First() could not be translated when accessing first … eco typographyWebJan 29, 2009 · Nick, please modify or remove this section as you feel is appropriate. The SQL generated is quite large. The int 0 (to be compared with the count) is passed in via parameter. SELECT [t0].X AS [id], CONVERT (NVarChar (MAX), ( SELECT [t6].Y FROM ( SELECT TOP (1) [t5].Y FROM [dbo]. concerts in la novemberconcerts in las vegas in jan 2023WebSkip(random number of rows) Method private T getRandomEntity(IGenericRepository repo) where T : EntityWithPk { var skip = (int)(rand.NextDouble() * repo ... concerts in las vegas december 4 2021WebJun 5, 2012 · Here is a few ways to do it (Just assume I'm using Dependency Injection for the DbConext) public class Example { private readonly DbContext Context; public Example(DbContext context) { Context = context; } public DbSetSampleOne[] DbSamples { get; set; } public void ExampleMethod DoSomething() { // Example 1: This will select … eco\u0027s scorched earth decorWeb70. Maybe an easy question, but can't find it easily so forgive me =) I try to select multiple columns. The statement I use is: var dataset2 = from recordset in entities.processlists where recordset.ProcessName == processname select recordset.ServerName, recordset.ProcessID, recordset.Username; Obviously, this doesn't even compile. eco\\u0027thibWebJan 23, 2012 · Therefore I tried to mimic Entity Framework's object by using the exact query EF creates, even with those [Extent1] aliases, but it didn't work. When analyzing the resulting object, its query ended like. FROM [dbo].[TableName] AS [Extent1].Where(c => ... instead of the expected eco\\u0027s highland homes