i have downloaded sample mvc application from here http://ravenmvc.codeplex.com/releases/view/45994
It works just fine. But i have a question. In sample application DocumentId looks like "categories-2", but in my application after i call Store method:
using (var session = DocumentStore.OpenSession())
{
session.Store(item);
session.SaveChanges();
return item;
}
i have DocumentId like "projects/3073". I want to have DocumentId in format just like in sample application. How i can do that? Is there some option i should change?
You need to set the DocumentConvention when you initialize your DocumentStore:
var ds = new DocumentStore();
ds.ConnectionStringName = connectionStringName;
ds.Initialize();
ds.Conventions.IdentityPartsSeparator = "-";
Related
Hope you are doing well.
I'm using EFCore.BulkExtensions[3.1.6] in .Net Core 3.1 Web API to perform bulk operations. Bulk insert and update are working fine but I'm not able to use BulkRead method to get the bulk data.
I refer this link https://github.com/borisdj/EFCore.BulkExtensions#read-example and tried it but I'm not getting data. Maybe I didn't understand the example.
Here is the code which I've tried:
IList<VehicleSubModel> submodels = new List<VehicleSubModel>(); // VehicleSubModel is the domain Entity
var result = submodels.Select(s => new VehicleSubModel() { Id = s.Id, Name = s.Name }).ToList();
var bulkConfig = new BulkConfig { UpdateByProperties = new List<string> { nameof(VehicleSubModel.Id), nameof(VehicleSubModel.Name) } };
await Task.Run(() => Context.BulkRead(result, bulkConfig));
I want to get Id and Name of all VehicleSubModel but it's not returning any record. Could anyone please explain how we can use the BulkRead method of EFCore.BulkExtensions. I spend several hours to get it done, search many links but not getting its solution.
Can anyone please help?
I have an ASP.NET Core 2.0 application and I'm trying to attach a user to a model:
var user = _userManager.FindByIdAsync(Model.Author);
var promotion = new Promotion()
{
Title = Model.Title,
User = user //error here,
Created = DateTime.Now
};
The problem with this code is that I can't assign user to promotion.User as user is the result of an async operation. I'd prefer not to use FindByIdAsync but for some reason I can't find FindById.
UserManager contains only async API and FindByIdAsync actually returns Task<User> instead of User. So you need to make your code async also and use FindByIdAsync like this:
var user = await _userManager.FindByIdAsync(Model.Author); // will return the User
Only if it is not possible leave your code synchronous, e.g. by calling Result property of the Task which will cause your thread to block until the result is available
var user = _userManager.FindByIdAsync(Model.Author).Result;
I am using Azure Mobile Services. I have a TableController<Photo>. In the controller, I can retrieve a single photo by id successfully. No problems using the following method:
//works
public SingleResult<Photo> GetPhoto(string id)
{
return Lookup(id);
}
However, since the photo is stored in Azure storage as a private blob, I want to tack on the SAS (Shared access signature) to allow my mobile client direct read access to the Azure blob for a given period of time.
In the GetPhoto call, I am successfully retrieving the SAS using the CloudBlobClient (removed for brevity).
I have defined a property on Photo called SasQueryString. I want to set it on the <Photo> object retrieved using Lookup(id) but the data returned from Lookup(id) is an IQueryable, not my strongly typed Photo object.
//! INCORRECT ! -- because photoResult is IQueryable
public SingleResult<Photo> GetPhoto(string id)
{
SingleResult<Photo> photoResult = Lookup(id);
//SingleResult<Photo> does not contain SasQueryString
photoResult.SasQueryString = "SAS from CloudBlobClient";
return photoResult;
}
If I do this, I can set the SasQueryString:
Photo photoResult = (Photo)Lookup(id).Queryable.FirstOrDefault<Photo>();
photoResult.SasQueryString = "SAS from CloudBlobClient";
However, I'm not sure how to return this strongly typed object as a SingleResult<Photo>.
//! INCORRECT ! -- this doesn't work because the Create method expects an IQueryable
return SingleResult<Photo>.Create(photoResult);
I've also tried this but photoResult is anIQueryable so I can't set the strongly typed SasQueryString value this way either.
//! INCORRECT !
var photoResult = Lookup(id).Queryable.Select(x => new Photo()
{
Id = x.Id,
TheOtherFields = x.TheOtherFields
});
photoResult.SasQueryString = "SAS from CloudBlobClient";
I am obviously missing something crucial here but it seems like I should be able to combine the lookup for the photo and the request for the SAS into a single call that returns my photo data after tacking on the SAS ticket...
== UPDATE ==
I found the following example: Creating a Leaderboard App with Azure Mobile Services .NET Backend. It is doing something similar to what I want to do but I have yet to try it.
// GET tables/PlayerRank/48D68C86-6EA6-4C25-AA33-223FC9A27959
public SingleResult<PlayerRankDto> GetPlayerRank(string id)
{
var result = Lookup(id).Queryable.Select(x => new PlayerRankDto()
{
Id = x.Id,
PlayerName = x.Player.Name,
Score = x.Score,
Rank = x.Rank
});
return SingleResult<PlayerRankDto>.Create(result);
}
which modified for my situation might look like the following:
public SingleResult<Photo> GetPhoto(string id)
{
var result = Lookup(id).Queryable.Select(x => new Photo()
{
Id = x.Id,
ImageUri = x.ImageUri,
SasQueryString = GetSas(id),
});
return SingleResult<PlayerRankDto>.Create(result);
}
You are not doing it the right way:
When you get the a list of Photos or a Photo it will give the data from storage in database and SasQueryString is not storaged, only the Url from blob storage should be;
You only provide SasQueryString in Insert or Update methods, because you need to define the url or update the url if need;
Note: Get methods do not change data
When a client app insert a photo the backend should do:
create the url for the photo and generate the SasQueryString
save the photo, with the url create, in database
before return the photo set the SasQueryString
client app upload the image to blob using the SasQueryString and url you provided
Why you have a Photo and a Controller for Photo???
If you have an object "Car" that has an image, it should have "car.Url" and a class similar to BlobItem.cs and you can see BlobStorageExtensions.cs.
Note: BlobItem.cs will be a not mapped property, I do not want save it on database.
I need to create a sample with it and the nugets...
I am working on a code where I need Multiple tables as result of a stored procedure. I am using Entity Framework repository pattern. It returns and bind an IEnumerable object, but I need to bind it with multiple IEnumerables at the same time.
Can anybody help?
This is the code I am using :
db.Database.SqlQuery("procReturnsMultipleResuiltSets")
the ways to achieve your goal are disclosed in this article.
From related article the most common way is:
using (var db = new BloggingContext())
{
// If using Code First we need to make sure the model is built before we open the connection
// This isn't required for models created with the EF Designer
db.Database.Initialize(force: false);
// Create a SQL command to execute the sproc
var cmd = db.Database.Connection.CreateCommand();
cmd.CommandText = "[dbo].[GetAllBlogsAndPosts]";
try
{
db.Database.Connection.Open();
// Run the sproc
var reader = cmd.ExecuteReader();
// Read Blogs from the first result set
var blogs = ((IObjectContextAdapter)db)
.ObjectContext
.Translate<Blog>(reader, "Blogs", MergeOption.AppendOnly);
foreach (var item in blogs)
{
Console.WriteLine(item.Name);
}
// Move to second result set and read Posts
reader.NextResult();
var posts = ((IObjectContextAdapter)db)
.ObjectContext
.Translate<Post>(reader, "Posts", MergeOption.AppendOnly);
foreach (var item in posts)
{
Console.WriteLine(item.Title);
}
}
finally
{
db.Database.Connection.Close();
}
}
please note the important remark: The first result set must be consumed before moving to the next result set.
I am trying to write REST web service through which our clients can upload a file on our file server. IS there an example or any useful links which I can refer for any guidance?
I haven't seen many examples of POST operation using ADO.NET data services available.
I've uploaded a file to ADO.NET dataservices using POST although I'm not sure whether it's the recommended approach. The way I went about it is:
On the dataservice I've implemented a service operation called UploadFile (using the WebInvoke attribute so that it caters for POST calls):
[WebInvoke]
public void UploadFile()
{
var request = HttpContext.Current.Request;
for (int i = 0; i < request.Files.Count; i++)
{
var file = request.Files[i];
var inputValues = new byte[file.ContentLength];
using (var requestStream = file.InputStream)
{
requestStream.Read(inputValues, 0, file.ContentLength);
}
File.WriteAllBytes(#"c:\temp\" + file.FileName, inputValues);
}
}
Then on the client side I call the data service using:
var urlString = "http://localhost/TestDataServicePost/CustomDataService.svc/UploadFile";
var webClient = new WebClient();
webClient.UploadFile(urlString, "POST", #"C:\temp\test.txt");
This uses a WebClient to upload the file which places the file data in the HttpRequest.Files collection and sets the content type. If you would prefer to send the contents of the file yourself (eg from an Asp FileUpload control) rather than the webClient reading a file using a path to the file, you can use a WebRequest similar to the way that it's done in this post. Although instead of using
FileStream fileStream = new FileStream(uploadfile,
FileMode.Open, FileAccess.Read);
you could use a byte array that you pass in.
I hope this helps.
I'm not 100% sure how to do this directly to a file server per se, but ADO.Net Data Services definitely support something similar to a database. The code below is how a similar goal of putting a file into a database has been accomplished. Not sure how much that will help, but
var myDocumentRepositoryUri = new Uri("uri here");
var dataContext = new FileRepositoryEntities(myDocumentRepositoryUri);
var myFile = new FileItem();
myfile.Filename = "upload.dat";
myFile.Data = new byte[1000]; // or put whatever file data you want to here
dataContext.AddToFileItem(myFile);
dataContext.SaveChanges();
Note: this code is also using Entity Framework to create a FileItem (representation of a database table as an object) and to save that data.