/// <summary>
/// This stores a document into CosmosDB. First the document is stored with the
/// DocumentDB-API and then with the MongoAPI. Explore both Location-Elements:
/// * "LocationMongoDB" and
/// * "LocationCosmosDB"
/// and their representation in the database.
/// </summary>
/// <returns></returns>
public static async Task DemoStorageOfLocation()
{
try
{
MongoItem demoDoc = new MongoItem("Hansi", "Huber", "Test", "ModeT", "",
1.1, 2.2,
new string[] { "male", "person" },
new string[] { "hansi" });
// =======================================================
// Store in CosmosDB
// =======================================================
DocumentClient docDBclient = await CosDB.ConnectToCosmosDB(Config.Account_DemoBuild_Mongo, Config.Account_DemoBuild_Mongo_Key);
Database docDBdb = await CosDB.CreateOrGetDatabase(docDBclient, "demodb");
DocumentCollection collection = await CosDB.CreateOrGetCollection(docDBclient, docDBdb, "democolDocDB", 400, null, null, false);
await docDBclient.CreateDocumentAsync(collection.SelfLink, demoDoc);
// =======================================================
// Store with MongoDB API
// =======================================================
MongoQueryTest queryTest = new MongoQueryTest();
MongoClient client = MongoDemo.Client;
var db = client.GetDatabase("demodb");
try
{
await db.DropCollectionAsync("democol");
}
catch (Exception)
{
}
var col = db.GetCollection <MongoItem>("democol");
await col.InsertOneAsync(demoDoc);
}
catch (Exception ex)
{
Console.WriteLine($"DemoMongoAPILocation Demo failed with {ex.Message}.");
throw;
}
}
/// <summary>
/// Create some Test Data in Memory
/// </summary>
/// <returns></returns>
public List <MongoItem> CreateTestData()
{
List <MongoItem> result = new List <MongoItem>();
MongoItem newItem;
newItem = new MongoItem("Andreas", "Pollak", "Vienna", "ModeA", "2017:04:03 14:00:00", 48.080, 16.140, new string[] { "person", "male" }, new string[] { "apollak", "pollaka" });
result.Add(newItem);
newItem = new MongoItem("Nina", "Huber", "Vienna", "ModeA", "2017:04:03 15:00:00", 48.085, 16.145, new string[] { "person", "female" }, new string[] { "ninah", "hnina" });
result.Add(newItem);
newItem = new MongoItem("Michaela", "Bauer", "Vienna", "ModeB", "2017:04:03 16:00:00", 48.090, 16.150, new string[] { "person", "female" }, new string[] { "michib", "bmichi" });
result.Add(newItem);
newItem = new MongoItem("Karl", "Sarg", "Graz", "ModeB", "2017:04:03 19:00:00", 48.095, 16.155, new string[] { "person", "male" }, new string[] { "ksarg", "sargk" });
result.Add(newItem);
newItem = new MongoItem("Martina", "Uhlig", "Graz", "ModeC", "2017:04:02 18:00:00", 48.100, 16.160, new string[] { "person", "female" }, new string[] { "martinau", "umartina" });
result.Add(newItem);
newItem = new MongoItem("Susan", "Maier", "Graz", "ModeC", "2017:04:02 17:00:00", 48.105, 16.165, new string[] { "person", "female" }, new string[] { "susanm", "msusan" });
result.Add(newItem);
newItem = new MongoItem("Karin", "Janos", "Graz", "ModeD", "2017:04:05 09:00:00", 48.110, 16.170, new string[] { "person", "female" }, new string[] { "karinj", "jkarin" });
result.Add(newItem);
return(result);
}
/// <summary>
/// Shows the behaviour of CosmosDB when access with Linq for MongoDB driver
/// in contrary to a standard mongodb instantiated via Bitnami as virtual machine f.e.
/// </summary>
/// <returns></returns>
public static async Task DemoMongoAPIQueries1()
{
try
{
MongoClient client = MongoDemo.Client;
var db = client.GetDatabase("demodb");
try
{
await db.DropCollectionAsync("democol");
}
catch (Exception)
{
}
var col = db.GetCollection <MongoItem>("democol");
MongoItem itemA = new MongoItem()
{
id = "84476d91-8fe4-4d8c-8525-feefb3e12912",
City = "demo",
DemoUser = new MUser()
{
FirstName = "Hansi", LastName = "Huber"
},
UserList = new string[] { "user1" },
TagList = new string[] { "car", "crash" }
};
MongoItem itemB = new MongoItem()
{
id = "2ba8a3a2-9937-408b-b5d3-0acef8ce0fb7",
City = "marastore",
DemoUser = new MUser()
{
FirstName = "Mara", LastName = "Jade"
},
UserList = new string[] { "user2" },
TagList = new string[] { "car", "luxus" }
};
await col.InsertOneAsync(itemA);
await col.InsertOneAsync(itemB);
/// Try to load documents that have their "Container" property
/// start with "mara".
/// Bitnami: Returns 1 result.
/// CosmosDB: Returns 1 result
/// {aggregate([{ "$match" : { "City" : /^mara/s } }])}
var result = from items in col.AsQueryable <MongoItem>()
where items.City.StartsWith("mara")
select items;
foreach (var item in result)
{
Console.WriteLine(item.City);
}
/// Bitnami: Returns 1 result.
/// CosmosDB: Returns 1 result
// {aggregate([{ "$match" : { "DemoUser.FirstName" : /^Hansi/s } }])}
result = from items in col.AsQueryable <MongoItem>()
where items.DemoUser.FirstName.StartsWith("Hansi")
select items;
foreach (var item in result)
{
Console.WriteLine(item.City);
}
/// Try to load documents that contain a certain element in their Tag List
/// This will always return 0 results with DocumentDB
/// This will return the correct result with a Bitnami MongoDB Instance
/// Bitnami ==> 2 Results
/// CosmosDB ==> 0 Results
/// It seems not the full MongoDB API is supported with CosmosDB or this is a bug!
/// {aggregate([{ "$match" : { "TagList" : "car" } }])}
result = from items in col.AsQueryable <MongoItem>()
where items.TagList.Contains <string>("car")
select items;
foreach (var item in result)
{
Console.WriteLine(item.id);
}
/// Again try to load the element by using Select Many
/// Fails with Exception: "$project or $group does not support {document}."
///
/// Update: This also fails with a BitNami MongoDB Instance
// This query:
// var tagResults = from a in col.AsQueryable<MongoItem>()
// from b in a.TagList
// where b.StartsWith("car")
// select b;
// Cannot be created
// This is my manual query which would retrieve the relevant Objects
// Returns a result in Bitnami
// In CosmosDB if fails because $unwind is not supported. If you remove $unwind it still does not return any results.
// db.democol.aggregate( [ { $unwind : "$TagList" }, { "$project" : { "TagList" : "$TagList", "_id" : "$_id" } },{$match : {"TagList":"car"} } ])
//
// This query
// var tagResults = from a in col.AsQueryable<MongoItem>()
// from b in a.TagList
// select b;
// Results in: {aggregate([{ "$unwind" : "$TagList" }, { "$project" : { "TagList" : "$TagList", "_id" : 0 } }])}
//
// This query
// var tagResults = from a in col.AsQueryable()
// from b in a.TagList
// select new { id = a.id, tag = b };
// Translates to: {aggregate([{ "$unwind" : "$TagList" }, { "$project" : { "id" : "$_id", "tag" : "$TagList", "_id" : 0 } }])}
// https://stackoverflow.com/questions/36601909/mongodb-c-sharp-query-nested-document
//var tagResults = col.AsQueryable<MongoItem>()
// .SelectMany(e => e.TagList, (e, b) => new { entityA = e, bitem = b })
// .Where(t => "car" == t.bitem)
// .Select(t => t.bitem);
// "$project or $group does not support {document}."
//var tagResults = col.AsQueryable<MongoItem>()
// .Select(e => new { e.id, e.TagList });
// {aggregate([{ "$project" : { "id" : "$_id", "TagList" : "$TagList", "_id" : 0 } }])}
var tagResults = col.AsQueryable <MongoItem>()
.SelectMany(e => e.TagList, (e, b) => new { A = e, B = b });
// Bitnami: Error => "$project or $group does not support {document}."
foreach (var tag in tagResults)
{
Console.WriteLine(tag);
}
// http://mongodb.github.io/mongo-csharp-driver/2.4/reference/driver/expressions/#filters
// http://mongodb.github.io/mongo-csharp-driver/2.4/reference/driver/crud/linq/#match
// https://www.codementor.io/pmbanugo/working-with-mongodb-in-net-2-retrieving-mrlbeanm5
// db.democol.find({ "TagList" : "crash" })
// Bitnami ==> Return 2 results
using (IAsyncCursor <MongoItem> cursor = await col.FindAsync(p => p.TagList.Any(t => t == "car")))
{
while (await cursor.MoveNextAsync())
{
IEnumerable <MongoItem> batch = cursor.Current;
foreach (MongoItem document in batch)
{
Console.WriteLine(document);
}
}
}
}
catch (Exception ex)
{
Console.WriteLine($"MongoDB Demo failed with {ex.Message}.");
throw;
}
}