Carla Moran
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Aug 14, 2020 · An entity is a lightweight persistence domain object. Typically, an entity represents a table in a relational database, and each entity instance corresponds to a row in that table. The primary programming artifact of an entity is the entity class, although entities can use helper classes. An entity class must follow these requirements.
Sep 17, 2014 · To update an existing entity, all you need to do is set the tracking state to Modified. According to the EF6 docs: If you have an entity that you know already exists in the database but to which changes may have been made then you can tell the context to attach the entity and set its state to Modified. For example:
Jan 3, 2014 · 281. You can call a stored procedure in your DbContext class as follows. this.Database.SqlQuery<YourEntityType>("storedProcedureName",params); But if your stored procedure returns multiple result sets as your sample code, then you can see this helpful article on MSDN. Stored Procedures with Multiple Result Sets.
Difference between DTO & Entity: Entity is class mapped to table. Dto is class mapped to "view" layer mostly. What needed to store is entity & which needed to 'show' on web page is DTO. Example : If I want to store employee model as follows : Take employee as an example, I need to store gender either male/female/other.
Oct 10, 2017 · To update an entity with Entity Framework Core, this is the logical process: Create instance for DbContext class. Retrieve entity by key. Make changes on entity's properties. Save changes. Update() method in DbContext: Begins tracking the given entity in the Modified state such that it will be updated in the database when SaveChanges() is called.
Apr 22, 2013 · The 422 (Unprocessable Entity) status code means the server understands the content type of the request entity (hence a 415 (Unsupported Media Type) status code is inappropriate), and the syntax of the request entity is correct (thus a 400 (Bad Request) status code is inappropriate) but was unable to process the contained instructions.
Sep 15, 2016 · C# Joins/Where with Linq and Lambda. acc => acc.AccountID, bank => bank.AccountID, (acc,bank) => new { Account = acc, BankTransaction = bank }); Edit: This should (or something similar) return a query that will return a collection of Accounts and inside each account it's relevant BankTransaction. This should do it but again, rather use LINQ if ...
Dec 20, 2016 · I have created the model from existing database using Entity Framework in ASP.NET Core. Here is the model of the Market table. public partial class Market. {. public Guid MarketId { get; set; } public string City { get; set; } public string CityF { get; set; } public string Name { get; set; } public string NameF { get; set; }
Apr 2, 2013 · The Include is a Eager Loading function, that tells Entity Framework that you want it to include data from other tables. The Include syntax can also be in string. Like this: db.Courses. .Include("Module.Chapter") .Include("Lab") .Single(x => x.Id == id); But the samples in LinqPad explains this better.
Jan 20, 2011 · A weak entity is the entity which can't be fully identified by its own attributes and takes the foreign key as an attribute (generally it takes the primary key of the entity it is related to) in conjunction. Examples. The existence of rooms is entirely dependent on the existence of a hotel. So room can be seen as the weak entity of the hotel.
