C# Development (Sam Corder)

and .Net Getting Started in 30 Minutes or Less Sam Corder @SamCorder samus@codeargyle.com

Baseline • MongoDB? • .Net?

Statically Dynamic • Challenges • Model a dynamic database in a static language • Javascript(json/bson) is not 1:1 with .Net • Compromises • Documents • Certain conventions (Arrays & Dates)

API Overview • Mongo - Entry point into server • Database - Operations on a Database • Collection - Queries • Document - Basic unit • Cursor - Holds query results * Database and Collection to be preﬁxed with “Mongo” in v 0.90

Mongo Types .Net Type Mongo Type Oid ObjectID _id Code CodeWScope Javascript Binary Binary DBRef DBRef MongoRegex Javascript regex

Diving In

Getting Connected <?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <section name="Mongo" type="MongoDB.Driver.Configuration.MongoConfigurat ionSection, MongoDB.Driver" /> </configSections> <Mongo> <connections> <add key="tests" connectionString="Server=localhost:27017" /> </connections> </Mongo> </configuration> string connstr = ConfigurationManager.AppSettings["simple"]; if(String.IsNullOrEmpty(connstr)) throw new ArgumentNullException("Connection string not found."); mongo = new Mongo(connstr); mongo.Connect(); ShowUsing(); var mongo = new M mongo.Connect();

Inserts library = mongo["library"]; albums = library["albums"]; albums.Insert(new Document(){{"Artist", "Seth Walker"}, {"Title", "Leap of Faith"}, {"Genre", "Blues"}}); albums.Insert(new Document(){{"Artist", "BB King"}, {"Title", "Lucille"}, {"Genre", "Blues"}}, true); • Insert a single document at a time • Insert multiples with IEnumerable • Safemode for when you need to know it got there var albums = db["albums"] Describe(albums); • _id Automatically added to documents albums.Insert(new Docum "Lucille"}, {"Artist", "BB Ki Show in shell

Finding Our Data var cursor = albums.Find(new Document(){{"Artist", "BB King"}}); cursor.Sort("Artist").Limit(5); //Fluent addition of criteria using(cursor){ foreach(Document doc in cursor.Documents){ Console.WriteLine(doc.ToString()); } } • Results lazily loaded in batches • Cursor should be disposed • Javascript using CodeWScope and $where var doc = albums.FindOn doc.ToString();

Updating Document lucille = albums.FindOne(new Document(){{"Artist", "BB King"}, {"Title", "Lucille"}}); var id = lucille["_id"]; //Oid lucille["Released"] = 1968; lucille["Songs"] = new Document[]{ new Document(){{"Title","Lucille"},{"length", "10:16"}}, new Document(){{"Title","You Move Me So"},{"length", "2:03"}}, new Document(){{"Title","Stop Puttin the Hurt on Me"},{"length", "3:04"}}, new Document(){{"Title","Watch Yourself"},{"length", "5:47"}} }; albums.Save(lucille); albums.Update(lucille, new Document(){{"_id", id}}); //Same as above • By default replaces document doc["Genre"] = "Blues"; albums.Save(doc); • $ ($set) modiﬁers for partial update var doc = albums.FindOne(new doc.ToString(); • Use Save() for individual documents • UpdateAll with a modiﬁer query and a spec

Deleting //remove documents with the genre Rock. albums.Delete(new Document(){{"Genre", "Rock"}}); //remove everything from the albums collection. albums.Delete(new Document()); • Delete takes a query like Find • Careful and empty Document deletes all

Additional Features • Connection Pooling • Various extra functions (Count, Hint, Explain, FindAndModify, etc.) • GridFS via Streams • Map Reduce • Execute Javascript on server • Mono

Heading to 1.0 • Type safe Collections IMongoCollection<T> • Improved Linq support • Projections, Aggregates, Conditions, Skip, Take • Updated GridFS API

Resources • Download Mongo at mongodb.org • C# driver http://github.com/samus/ mongodb-csharp • http://groups.google.com/group/mongodb- csharp • 10gen offers commercial support

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C# Development (Sam Corder)

by MongoSF on May 04, 2010

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C# Development (Sam Corder) — Presentation Transcript