Check if an insert or update was successful in Entity Framework

Question

In ADO.NET, ExecuteNonQuery() \"For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command\" (http://msdn.microsoft.com/en-us/

Answer 1

In EntityFramework, SaveChangesAsync() returns an int. So you can check if it is > 0 or not.

If something happens with SaveChangesAsync() it will return the number of effected rows and this means if value > 0 then true. So simply, you can have below scenerio:

INSERT

public Task CreateEntity(Entity entity){

    if(entity == null)
            return false;

    await _dataContext.Entities.AddAsync(entity);

    var created = await _dataContext.SaveChangesAsync();

    return created > 0;
}

UPDATE

public async Task UpdateEntity(Entity entityToUpdate)
{
     if(entityToUpdate == null)
               return false;

     _dataContext.Posts.Update(entityToUpdate);

     var updated = await _dataContext.SaveChangesAsync();

     return updated > 0;
}

DELETE

public async Task DeleteEntity(int entityId)
{
     var entity = await _dataContext.Entities.FindAsync(entityId);

     if (entity == null)
             return false;

     _dataContext.Entities.Remove(entity);

     var deleted = await _dataContext.SaveChangesAsync();

     return deleted > 0;
}

And in your methods, now you can simply check if that change is success or not:

For a simple MVC scenerio:

public Task CreateEntity(EntityModel model)
{
     if(model == null)
            return StatusCode(404);

     var entity = new Entity
     {
          attribute1 = model.attribute1,
          attribute2 = model.attribute3
     };

     var isCreated = await _entityService.CreateEntity(entity);

     if(isCreated)
     {
          //do something and return a view.
     }
     else
     {
         //you can return a status code, or an error view.
     }
}

You can do the same practice for Update & Delete