I try to get all data from collection into MongoDB server using C# driver.
The idea is connect to the server and get all collection than insert into list of class.
List<WatchTblCls> wts;
List<UserCls> users;
List<SymboleCls> syms;
public WatchTbl()
{
InitializeComponent();
wts = new List<WatchTblCls>();
users = new List<UserCls>();
syms = new List<SymboleCls>();
}
public async void getAllData()
{
client = new MongoClient("mongodb://servername:27017");
database = client.GetDatabase("WatchTblDB");
collectionWatchtbl = database.GetCollection<WatchTbl>("Watchtbl");
collectionUser = database.GetCollection<UserCls>("Users");
collectionSymbole = database.GetCollection<SymboleCls>("Users");
var filter = new BsonDocument();
using (var cursor = await collectionWatchtbl.FindAsync(filter))
{
while (await cursor.MoveNextAsync())
{
var batch = cursor.Current;
foreach (var document in batch)
{
wts.Add(new WatchTblCls(document["_id"], document["userId"], document["wid"], document["name"], document["Symboles"]));
}
}
}
}
I get this error under
wts.Add(new WatchTblCls(document["_id"], document["userId"], document["wid"], document["name"], document["Symboles"]));
Cannot apply indexing with [] to an expression of type 'WatchTbl'
I don't understand the reason behind using WatchTbl and WatchTblCls both together. Is WatchTblCls a model for the entity WatchTbl here? Im not sure.
In any case. If you go for aggregation and want to convert WatchTbl collection to WatchTblCls list, your desired solution might look like the following. I don't know the defiitions of the classes so I'm assuming:
var client = new MongoClient("mongodb://servername:27017");
var database = client.GetDatabase("WatchTblDB");
var collectionWatchtbl = database.GetCollection<WatchTbl>("Watchtbl");
var collectionUser = database.GetCollection<UserCls>("Users");
var collectionSymbole = database.GetCollection<SymboleCls>("Users");
var list = collectionWatchtbl.AsQueryable().Select(x => new WatchTblCls() {
id = x.id,
userId = x.userId,
.....
});
If you can use the same WatchTbl class and still want to load the full collection to a local List (which is definitely not a good idea):
List<WatchTbl> list = await collectionWatchtbl.Find(x => true).ToListAsync();
Related
I am trying to use an AppOnlyAuthenticated context in order to loop over all the documents in a specific list in Sharepoint. The reason to use the AppContext is that this needs to be automated (part of a script) and using an actual user accounts seems like the wrong choice.
Repro:
// using OfficeDevPnp.Core;
// using Microsoft.SharePoint.Client;
var webUrl = "https://company.sharepoint.com/sites/test";
var appId = "xXXXX-xxxx-.....";
var appSecret = "longSecret";
var listTitle = "ListTitle";
var am = new AuthenticationManager();
using (var context = am.GetAppOnlyAuthenticatedContext(webUrl, appId, appSecret))
{
var lists = context.Web.Lists;
var list = lists.GetByTitle(listTitle);
var listItems = list.GetItems(CamlQuery.CreateAllItemsQuery(rowLimit = 5));
context.Load(lists);
context.Load(list);
context.Load(listItems, items => item.Include(i => i.Id));
context.ExecuteQuery();
var list_ItemCount = list.ItemCount;
var listItems_Count = listItems.Count;
}
}
The list_ItemCount has the correct value of items in that list of files but listItems_Count is zero. Obviously, when trying to loop over listItems, there is nothing to enumerate.
Could it be a permission thing? Or is something else causing the issue?
I have documents:
{"handler":"north"}
{"handler":"south"}
{"handler":"west"}
{"handler":"east"}
I want to find a matching handler from a given string input, e.g. "westtown" and expects the handler will be "west".
Please help, my code below does not work.
String inputstring = "westtown";
IMongoCollection<BsonDocument> collection = null;
List<BsonDocument> pages = null;
try
{
collection = db.GetCollection<BsonDocument>("handlers");
pages = await collection.Find(x => (inputstring.StartsWith(x["handler"].AsString))).ToListAsync<BsonDocument>();
}
...
I use classless scheme, so I use BsonDocument on the dynamic.
AFAIK, In MongoDB you can find it with $where operator like this:
{ $where: "'westtown'.startsWith(this.handler)" }
So, I think in c# you can do it with something like this:
var filter =
new BsonDocument(
new Dictionary<string, BsonValue>
{
{
"$where",
new BsonString("'westtown'.startsWith(this.handler)")
}
});
var result = col.Find(filter).ToList();
I am trying to access a stored procedure that retrieves a page using an id.
But I am getting an error:
Error 1 Cannot implicitly convert type
'System.Data.Entity.Core.Objects.ObjectResult<StorePageCMS.Models.mn_StorePage_Select_One_Result>' to 'StorePageCMS.Models.StorePage'
I am not sure how to fix this. The stored precedure that comes from dbEntities from SQL Server, does take an int parameter.
Any help is much appreciated.
public StorePage Get(int StorePageID)
{
using (dbEntities db = new dbEntities())
{
StorePage storepage = db.mn_StorePage_Select_One(StorePageID);
if (storepage == null)
{
throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.NotFound));
}
return storepage;
}
}
UPDATE
I rewrote the method this way:
public List<StorePage> Get(int StorePageID)
{
List<StorePage> storepagelist = new List<StorePage>();
using (dbEntities db = new dbEntities())
{
var results = db.mn_StorePage_Select_One(StorePageID).ToList();
foreach (var result in results)
{
var storepage = new StorePage()
{
StorePageID = result.StorePageID,
SPPreambleID = result.SPPreambleID,
Title = result.Title,
SEOTitle = result.SEOTitle,
ParentStorePageID = result.ParentStorePageID ?? -1,
Meta = result.Meta,
Image = result.Image,
ImageLink = result.ImageLink,
Blurb = result.Blurb,
RegionID = result.RegionID,
Footer = result.Footer
};
storepagelist.Add(storepage);
}
return storepagelist;
}
}
Does this looks more correct?
2 UPDATE
Does this looks correct?
If you're not using the Code First model of Entity Framework
Since StorePageCMS.Models.mn_StorePage_Select_One_Result has no conversion to StorePage, I'm assuming it's a stored procedure result. If that's a stored procedure result (of mn_StorePage_Select_One), you need to map it's result to the StorePage model instead in the EDMX designer.
Here, you'd need to say it returns a collection of StorePageCMS.Models.StorePage Entities.
Can anyone tell where I make a mistake ? :( I want to insert a row using this. It's just not working. I also tried to use "context.SaveChanges();" but nothing changed. No insert at all, and no exception.
public List<string> Add_Address(string address, int selected_item)
{
List<string> list = new List<string>();
using(var context = new RSS_Reader_Database())
{
Address Address = new Address();
Category_Address Category_Address = new Category_Address();
Address.URL = address.ToString();
int max_id = Convert.ToInt32(context.Addresses.OrderByDescending(t => t.ID_Address).FirstOrDefault());
Category_Address.ID_Address = max_id;
Category_Address.ID_Category = selected_item+1;
var select_query = from t in context.Addresses select t.URL;
foreach (var element in select_query)
{
list.Add(element);
}
}
return list;
}
Edit: Following all Your advices, I made something that works. Looking at this code above, I have no idea what I was trying to do yesterday. Thanks a lot.
public List<string> Add_Address(string address, int selected_item)
{
List<string> list = new List<string>();
using(var context = new RSS_Reader_Database())
{
Address Address = new Address() { URL = address };
context.Addresses.Add(Address);
context.SaveChanges();
int max_id = context.Addresses.Max(u => u.ID_Address);
Category_Address Category_Address = new Category_Address() { ID_Address = max_id, ID_Category = selected_item + 1 };
context.Categories_Addresses.Add(Category_Address);
context.SaveChanges();
var query = from t in context.Addresses
select t.URL;
var data = query.ToList();
foreach (var element in data)
{
list.Add(element);
}
}
return list;
}
Saving with Entity Framework generally works like this. Using your above code as a starting point.
using(var context = new RSS_Reader_Database())
{
Address address = new Address();
// Set address properties
context.Addresses.Add(address);
context.SaveChanges();
}
You need to add the object to the DbSet<T> where T is the type of the entity that is defined on the DbContext. You then need to call SaveChanges() on the context.
I would suggest reading this. It is an easy to follow introduction to Entity Framework.
Not sure exactly what you are trying to do.
But if you are expecting to insert the data by the list.Add(element); command it won't work.
If you are planning to insert data into the same DB, you need to use one property from the context to represent the List collection add a new element on this property.
Something like:
context.Lists.Add(element);
if you want retrieve data, you should not call SaveChanges() !,
try get all values from one query like this:
List<string> select_query = (from t in context.Addresses select t.URL).ToList();
I am building some abstraction functions for my application to call, which will hit elasticsearch through Nest. One of such functions is a Delete(string id) call, which is easy to accomplish. I have done this as follows:
public void Delete(string id)
{
esClient.Delete(id);
}
Now let's say I want to do the same thing, but operate on several documents simultaneously. My original hunch was to do something like this:
public void Delete(IEnumerable<string> ids)
{
esClient.DeleteMany(ids); // won't compile
}
As my comment states, doing this won't compile. What is the proper way of batch deleting documents by ID in Nest?
To use esClient.DeleteMany(..) you have to pass collection of objects to delete.
var objectsToDelete = new List<YourType> {.. };
var bulkResponse = client.DeleteMany<YourType>(objectsToDelete);
You can get around this by using following code:
var ids = new List<string> {"1", "2", "3"};
var bulkResponse = client.DeleteMany<YourType>(ids.Select(x => new YourType { Id = x }));
Third option, use bulk delete:
var bulkResponse = client.Bulk(new BulkRequest
{
Operations = ids.Select(x => new BulkDeleteOperation<YourType>(x)).Cast<IBulkOperation>().ToList()
});
I was working on a .NET client for ElasticSearch 5.x, and I was fortunate to have the following code running (as well as succeeding all unit tests) for bulk deletion using ID's:
//IList<string> ids = ...
var descriptor = new BulkDescriptor();
foreach (var id in ids.Where(x => !string.IsNullOrWhiteSpace(x)))
descriptor.Delete<T>(x => x
.Id(id))
.Refresh(Refresh.WaitFor);
var response = await _client.BulkAsync(descriptor);