Entity framework get all records by id
WebFeb 6, 2014 · The IQueryable.ToQueryString method introduced in Entity Framework Core 5.0 may help with this scenario, if you are willing to have some raw SQL appearing in your code. This method will generate SQL that can be included in a raw SQL query to perform a bulk update of records identified by that query. For example: WebOct 14, 2024 · Lazy loading can be turned off for all entities in the context by setting a flag on the Configuration property. For example: C#. public class BloggingContext : DbContext { public BloggingContext() { this.Configuration.LazyLoadingEnabled = false; } } Loading of related entities can still be achieved using eager loading (see Eagerly Loading above ...
Entity framework get all records by id
Did you know?
WebSep 23, 2013 · I want to create a datagrid which contains all the records with then same name. I have this table: Shop ID name adress city ----- 1 name1 adress 1 city1 2 name 2 adress2 city2 3 name 2 4 name 2 city2 5 … WebDec 15, 2015 · This line will not actually execute anything on the database: context.tbl1.Where(obj => obj.name == "Robin Banks") It will return an IEnumerable 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 (e.g. a …
WebJun 30, 2014 · You can build the same query in LINQ using those ground rules. Here are the simple steps to follow. 1) Get the list of permissions from UserPermissions table 2) Foreach permission, recurse the tree to find … WebMay 31, 2015 · In the website when user clicks a category, then i want to find all the items having that category as foreign key from entity framework database. I came across method of Find () but it doesn't fulfill my requirement. What I want is something like. Database1Entities.Categories.Select (x => x.Cat_Id == Id); But I dont know the exact …
WebApr 10, 2024 · 1. First, create a ViewModel class and define the properties you want to show on the list. The ViewModel will provide just the data you need, not the entire entity. For sample: public class DeviceViewModel { public int Id { get; set; } public string Name { get; set; } public int DeviceCount { get; set; } } WebMay 13, 2016 · 3 Answers. public static List GetSeatsForReservation (Guid reservationId) { var db= new EntityContext (); return (from s in db.ReservationSeat where s.ReservationID==Guid select s.seat).ToList (); } I will be honest, I still don't get the "=>". So I end up using the long way all the time.
WebOct 10, 2024 · Entity Framework Core Reads Record from the database through the DbContext object. For example we can get all records from the database by using the …
WebMay 30, 2013 · Solution with .Where and .Contains has complexity of O(N square). Simple .Join should have a lot better performance (close to O(N) due to hashing). december 2022 christmas bank holidaysThis topic covers the various ways you can query for data using Entity Framework, including LINQ and the Find method. The techniques shown in this topic apply equally to models created with Code First and the EF Designer. See more featherweight machine partsWebThere is a massive difference in the example you have posted, the first version: var urls = await context.Urls.ToListAsync(); This is bad, it basically does select * from table, returns all results into memory and then applies the where against that in memory collection rather than doing select * from table where... against the database.. The second method will not … feather weight machine serial numbersWebOct 7, 2016 · For example first I select all values which matches this search parameter. IQueryable listOfvalues = from b in dbContext.Table2 where b.Field1.Contains (searchParam) select b; result = listOfvalues.ToList (); And now I need to write code which returns all fields from Table1 where Field is in that listOfValues. c#. linq. entity … featherweight machine coversWebJul 14, 2024 · That's because you're mixing and matching repository-based queries and LINQ queries. Rather than doing a true join, you're fetching all the rows for each table and then joining them in-memory.. The easiest way to fix this is probably to just return IQueryable rather than IEnumerable from your GetAll method. Using … december 2022 cyclone weather weapon haarpWebJul 18, 2016 · We had the same problem in our system with Entity Framework dealing with views. Try using ROW_NUMBER () OVER () SQL to create a column with unique values , but did not work. We need to insert a field more, an FK for another table in the view so that it could add as an additional training for mebro EntityKeyMembers Elimite and so the … december 2022 current affairs pdfWebEF Core Query. Data querying in EF Core is performed against the DbSet properties of the DbContext. The DbSet represents a collection of entities of a specific type - the type specified by the type parameter. Queries are specified using Language Integrated Query (LINQ), a component in the .NET Framework that provides query capability against ... featherweight machines