first time i'm using MongoDB.
I have read this example:
SELECT a,b FROM users WHERE age=33
db.users.find({age:33}, {a:1,b:1})
But I can't translate it into C#. Can anyone help me?
I have translated your query below using the new C# driver (2.2)
var mongoClient = new MongoClient(""mongodb://127.0.0.1:27017"");
var database = mongoClient.GetDatabase("databaseName");
IMongoCollection<Users> _collection = database.GetCollection<Users>("Users");
var condition = Builders<Users>.Filter.Eq(p => p.age, 33);
var fields = Builders<Users>.Projection.Include(p => p.a).Include(p => p.b);
var results= _collection.Find(condition).Project<Users>(fields).ToList().AsQueryable();
You can do it using SetFields method of MongoCursor class, below full example:
var server = MongoServer.Create(connectionString);
var db = _server.GetDatabase("dbName");
var users = db.GetCollection("users");
var cursor = users.FindAs<DocType>(Query.EQ("age", 33));
cursor.SetFields(Fields.Include("a", "b"));
var items = cursor.ToList();
you can use anonymous class
public class User
{
public int age;
public string a;
public string b;
}
var collection = db.GetCollection<User>("Users");
var results = collection.Find(Builders<User>.Filter.Eq(user => user.age, 33))
.Project(u => new { u.a, u.b }).ToList();
//create user class
//(not sure how your class looks like)
public class User
{
public int age;
public string a;
public string b;
}
//then you can use LINQ easily
var server = MongoServer.Create(connectionString);
var db = server.GetDatabase("dbName");
var usersCollection = db.GetCollection<User>("users");
var filteredCollection = usersCollection.AsQueryable().Where(x=> x.age < 33).Where(x=> x.a != null).Contains(x=> x.b != null);
Related
Basically here's my code which I'm having trouble with. Insanely new to mongoDB and would love to understand how to get values out of a JSON string that is returns in the variable 'line'.
public string get_data()
{
var client = new MongoClient();
var db = client.GetDatabase("test");
var collection = db.GetCollection<BsonDocument>("metacorp");
var cursor = collection.Find("{'movie_name' : 'Hemin'}").ToCursor();
var line = "";
foreach (var document in cursor.ToEnumerable())
{
using (var stringWriter = new StringWriter())
using (var jsonWriter = new JsonWriter(stringWriter))
{
var context = BsonSerializationContext.CreateRoot(jsonWriter);
collection.DocumentSerializer.Serialize(context, document);
line = stringWriter.ToString();
}
}
var js = new JavaScriptSerializer();
var d = js.Deserialize<dynamic>(line);
var a = d["movie_name"];
return line;
}
This is the output I get if I return line:
{ "_id" : ObjectId("58746dcafead398e4d7233f5"), "movie_name" : "Hemin"
}
I want to be able to fetch the value 'Hemin' into 'a'.
I know this is not what you're asking for but since you're using the c# driver then I would recommend the following. Assumes you have a c# class corresponding to metacorp collection or at least a serializer that handles it. Hope it helps.
var client = new MongoClient();
var db = client.GetDatabase("test");
var collection = db.GetCollection<MetaCorp>("metacorp");
var m = collection.SingleOrDefault(x => x.Movie_Name == "Hemin"); // Assuming 0 or 1 with that name. Use Where otherwise
var movieName = "Not found";
if(m!= null)
movieName = m.Movie_Name;
You could have your dto class for movie ans just fetch the data from collection:
public class Movie
{
public ObjectId Id { get; set; }
public string movie_name { get; set;}
}
...
var client = new MongoClient();
var db = client.GetDatabase("test");
var collection = db.GetCollection<BsonDocument>("metacorp");
var movies = collection.Find(x=>x.movie_name == "Hemin").ToEnumerable();
I have a problem with LINQ query (see comment) there is a First method and it only shows me the first element.
When I write in the console "Sales Representative" it shows me only the first element of it as in
I would like to get all of data about Sales Representative. How can I do it?
public PracownikDane GetPracownik(string imie)
{
PracownikDane pracownikDane = null;
using (NORTHWNDEntities database = new NORTHWNDEntities())
{
//Employee matchingProduct = database.Employees.First(p => p.Title == imie);
var query = from pros in database.Employees
where pros.Title == imie
select pros;
// Here
Employee pp = query.First();
pracownikDane = new PracownikDane();
pracownikDane.Tytul = pp.Title;
pracownikDane.Imie = pp.FirstName;
pracownikDane.Nazwisko = pp.LastName;
pracownikDane.Kraj = pp.Country;
pracownikDane.Miasto = pp.City;
pracownikDane.Adres = pp.Address;
pracownikDane.Telefon = pp.HomePhone;
pracownikDane.WWW = pp.PhotoPath;
}
return pracownikDane;
}
Right now you are just getting the .First() result from the Query collection:
Employee pp = query.First();
If you want to list all employees you need to iterate through the entire collection.
Now, if you want to return all the employee's you should then store each new "pracownikDane" you create in some sort of IEnumerable
public IEnumerable<PracownikDane> GetPracownik(string imie) {
using (NORTHWNDEntities database = new NORTHWNDEntities())
{
var query = from pros in database.Employees
where pros.Title == imie
select pros;
var EmployeeList = new IEnumerable<PracownikDane>();
foreach(var pp in query)
{
EmployeeList.Add(new PracownikDane()
{
Tytul = pp.Title,
Imie = pp.FirstName,
Nazwisko = pp.LastName,
Kraj = pp.Country,
Miasto = pp.City,
Adres = pp.Address,
Telefon = pp.HomePhone,
WWW = pp.PhotoPath
});
}
return EmployeeList;
}
Then, with this returned List you can then do what ever you wanted with them.
Had a class:
class filedate
{
public int id;
public string fname;
}
Fill my list with values:
List<filedate> List = ReadList(sqlFiles);
string[] FolderFiles = System.IO.Directory.GetFiles(path2Copy);
Trying to get results:
var results = List.Where(filedate =>
FolderFiles.Any(x=>Path.GetFileNameWithoutExtension(x) ==
Path.GetFileNameWithoutExtension(filedate.fname)));
I have the same files in List and FolderFiles, but get no results in results. I am a newbie to Linq. Where is the problem?
update:
List: (count) > 1000
for example:
<1023, 'tr_F2opervag_2808_1644.dat'>
FolderFiles example:
"\\domain.corp.dns\share\folder\tr_F2opervag_2808_1644.dat"
Update 2:
found out my mistake! Comment with intersection was helpful! This code is working:
var results = List.Where(
(filedate x) =>
{
return ! FolderFiles.Any(xxx =>
Path.GetFileNameWithoutExtension(xxx) ==
Path.GetFileNameWithoutExtension(x.fname));
});
You're code works fine for me so there's something wrong with the format of your data in the List coming back from the database.
Post an example of an fname value from the filedata object. It needs to be a valid fully qualified path.
This works fine for me.
public class FileData{
public int id;
public string fname;
}
void Main()
{
List<FileData> list = new List<FileData>{
new FileData { id=1, fname="C:\\install.res.1042.dll"},
new FileData { id=2, fname="C:\\install.res.1041.dll" },
new FileData { id=3, fname="C:\\install.res.9999.dll"}
};
string[] FolderFiles = System.IO.Directory.GetFiles("C:\\");
var results = list
.Where(fd =>
FolderFiles.Any(x=>Path.GetFileNameWithoutExtension(x) ==
Path.GetFileNameWithoutExtension(fd.fname)));
Console.WriteLine(results);
}
If you need to find the difference this should work. This is available via Enumerable.Except.
var dbFiles = ReadList(sqlFiles);
var dbFilePaths =
dbFiles.Select(fdate =>
Path.GetFileNameWithoutExtension(fdate.fname).ToLower());
var fsFilePaths =
Directory
.GetFiles(path2Copy)
.Select(filePath =>
Path.GetFileNameWithoutExtension(filePath).ToLower());
var diff =
dbFilePaths
.Except(fsFilePaths)
.Join(dbFiles,
filePath => filePath,
fdate => fdate.fname,
(filePath, fdate) => fdate)
.ToList();
Let the string projects equal "p1,p2,p3" and in the database the identifier for each exists as follows p1 = 1 ,p2 = 2, p3 = 3. Only the first project in the list is being returned in my query, any thoughts on why?
private List<int> getProjects(string projects)
{
String[] projectArray = projects.Split(',');
QMOIIEntities db = new QMOIIEntities();
var projectList = db.wbs_projects
.Where(x => projectArray.Contains(x.prjName))
.Select(x => x.prjID).ToList();
return projectList;
}
**UPDATE
This issue was whitespace in the string I changed
String[] projectArray = projects.Split(',');
to
String[] projectArray = projects.Trim().Split(',');
The following code uses the same logic, the one you have mentioned in your question. I have created dummy data. The code is behaving as expected i.e. the output is the prjID corresponding to each prjName.
void Main()
{
string projects = "p1,p2,p3";
List<string> projectArray = projects.Split(',').ToList();
TestEntities db = new TestEntities();
db.wbs_projects = new List<TestEntities>();
db.wbs_projects.Add(new TestEntities(){prjName = "p1",prjID="Test1"});
db.wbs_projects.Add(new TestEntities(){prjName = "p2",prjID="Test2"});
db.wbs_projects.Add(new TestEntities(){prjName = "p3",prjID="Test3"});
var projectList = db.wbs_projects
.Where(x => projectArray.Contains(x.prjName))
.Select(x => x.prjID).ToList();
foreach(var item in projectList)
{
Console.WriteLine(item);//Test1,Test2,Test3
}
}
public class TestEntities
{
public List<TestEntities> wbs_projects{get;set;}
public string prjName{get;set;}
public string prjID{get;set;}
}
I am using this code to retrieve global optionsets
var request = new RetrieveOptionSetRequest {Name = "OptionsetNameGoesHere"};
var retrieveOptionSetResponse =(RetrieveOptionSetResponse) DynamicsHandler._serviceProxy.Execute(request);
var retrievedOptionSetMetadata =(OptionSetMetadata) retrieveOptionSetResponse.OptionSetMetadata;
var optionList = retrievedOptionSetMetadata.Options.ToArray();
foreach (var optionMetadata in optionList)
{
Printout(optionMetadata.Label.LocalizedLabels[0].Label + "\n");
}
But how do I retrieve optionsets like AccountCategory (AccountCategoryCode) so that I can bind them to a Combobox?
You should get it with a RetrieveAttributeRequest. It will return an RetrieveAttributeResponse which contains the Property AttributeMetadata.
In your case it should be of type OptionSetMetadata, which is what you are looking for.
This is how I have solved this problem.
CRMBase is my base class with connection to the CRM instance. Codelanguage: C#
public static Dictionary<int, string> GetAll(CRMBase conn, string entityName, string attributeName)
{
OptionMetadataCollection result = RetrieveOptionSetMetaDataCollection(conn, entityName, attributeName);
return result.Where(r => r.Value.HasValue).ToDictionary(r => r.Value.Value, r => r.Label.UserLocalizedLabel.Label);
}
// Method to retrieve OptionSet Options Metadadata collection.
private static OptionMetadataCollection RetrieveOptionSetMetaDataCollection(CRMBase conn, string prmEntityName, string prmAttributeName)
{
RetrieveEntityRequest retrieveEntityRequest = new RetrieveEntityRequest();
retrieveEntityRequest.LogicalName = prmEntityName;
retrieveEntityRequest.EntityFilters = Microsoft.Xrm.Sdk.Metadata.EntityFilters.Attributes;
RetrieveEntityResponse retrieveEntityResponse = (RetrieveEntityResponse)conn._orgContext.Execute(retrieveEntityRequest);
return (from AttributeMetadata in retrieveEntityResponse.EntityMetadata.Attributes where
(AttributeMetadata.AttributeType == AttributeTypeCode.Picklist & AttributeMetadata.LogicalName == prmAttributeName)
select ((PicklistAttributeMetadata)AttributeMetadata).OptionSet.Options).FirstOrDefault();
}