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

2. Baseline
• MongoDB?
• .Net?

3. 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)

4. 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

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

6. Diving In

7. 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();

8. 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

9. 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();

10. 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

11. 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

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

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

14. 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