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What is the most efficient way to implement update row if it exists, else insert new row logic using Entity Framework? Or are there any patterns for this? c# ...

Apr 12, 2018 · When you add an entity to a DbContext, EF gives the Id field a default value of 0, and the database will assign a unique value to the row when the INSERT is executed. You've tried to incorrectly adapt the 'update or insert' pattern to use the property serviceName , and the solution is to use the pattern as provided by the MSDN article you referenced, or execute a query.

In this case use the 'Add' method or the 'Added' entity state to track the graph and then set the state of non-new entities to 'Unchanged' or 'Modified' as appropriate."

AddOrUpdate implementation in Entity Framework 6.x, and then look to ... and then deciding if you'll insert or update those entities based ...

SQL UPDATE [Employees] SET [Salary] = [Salary] + 1000; This performs the entire operation in a single roundtrip, without loading or sending any actual data to the …

When you add an entity to a DbContext, EF gives the Id field a default value of 0, and the database will assign a unique value to the row when the INSERT is executed. You've tried to incorrectly adapt the 'update or insert' pattern to use the property serviceName , and the solution is to use the pattern as provided by the MSDN article you referenced, or execute a query.

i am new in EF. i need to add data if it does not exist in db else update data.i got a code but could not understand how to call it. so need ...

Hi,. I have a pb with VS 2015 +IBM Data Server Client Version 10.5 + EF6 + Informix Server Version 12.10. I do a simple Insert.

Entity Framework (EF6) insert or update if exists for properties Assuming the model be like:...class Foo { virtual Bar Bar {get; set ;} } class Bar { int Id { get; set; } string Property {get; …

i am new in EF. i need to add data if it does not exist in db else update data.i got a code but could not understand how to call it. so need a small example which tell me how …

... and understand saving data into entity framework core. how to insert the record into entity framework core. how to update reco...

As per the above figure, Entity Framework builds and executes INSERT, UPDATE, or DELETE statements for the entities whose EntityState is Added, Modified, ...

It’s because Entity Framework does not magically figure out which properties have changed vs. which properties have not changed, it takes the entity, and if it exists, enters …

When SaveChanges is called, an UPDATE statement is generated and executed by the database. var author = context.Authors.First(a => a.

Decide Insert or Update on Entity Framework. public void Guardar (Pedidos myPedido) { using (var context = new OhmioEntities ()) { if (myPedido.ID_Pedido == 0) { …

Entity Framework AddOrUpdate. AddOrUpdate. add-or-update. A common pattern for some applications is to either add an entity as new (resulting in a database insert) or attach an entity as existing and mark it as modified (resulting in a database update) depending on the value of the primary key. For example, when using database generated integer primary keys it is common to treat an entity with a zero key as new and an entity with a non-zero key as existing.

In Nhibernate to update an object it's not necessary to pass the id, you just pass the entity and Nhibernate matches the id by itself and update the entity. In EF I'm using this approach: protected virtual bool UpdateEntity (TEntity entity, int id) { using (var ctx = new GenericContext ()) { var list = ctx.Set<TEntity> ().ToList (); ctx.Entry<TEntity> (ctx.Set<TEntity> ().Find (id)).CurrentValues.SetValues (entity); return ctx.SaveChanges () > 0; } }

This is especially relevant for insert and update scenarios, where we sometimes need to work with thousands of objects. Sending those objects to ...

Entity Framework AddOrUpdate add-or-update A common pattern for some applications is to either add an entity as new (resulting in a database insert) or attach an entity as existing and …

Entity Framework Core: insert or update, the lazy way. It seems as if I'm getting more lazy by the day. That's great, because I didn't really feel like manually mapping my data to my data models in order to have Entity …

Mar 30, 2019 · I've been fiddling around quite a lot with GraphQL lately. During this process I figured out that the create and update logic I write on the client-side is quite simillar. This led me to think that, unless a special operation needed to be executed, most create and update logic could be combined in save, or in my case mutate operation. Depending on whether the primary key would be provided either an update or create operation should be executed.

It's far more convenient to build or modify entities you work with in one logical unit of work and then do one SaveChanges call. That's why I only set entity state by this method. Why Attach? …

If you want the whole entity updated from a detached state then the easiest thing to do is this. context.Entry (updated).State = EntityState.Modified; context.SaveChanges (); This will mark the whole entity as dirty and save everything back to the database. Share edited Aug 24, 2016 at 19:23 answered Aug 24, 2016 at 19:07 Igor 59.7k 10 94 167

Entity Framework Core: insert or update, the lazy way · Merge: This operation combines two data sets into one based on primary keys. · Upsert: ...