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Introduction to MongoDB
for C# developers
by Taras Romanyk – [email protected]://www.linkedin.com/in/rredcat
What is it?
● Document
● Open source
● High performance
● Horizontally scalable
Terminology
RDBMS MongoDB
Table, View Collection
Row Document
Index Index
Join Embedded Document
Foreign Key Reference
Partition Shard
What is it?
BSON{
"_id": ObjectId("4efa8d2b7d284dad101e4bc7"),
"Last Name": "PELLERIN","First Name": "Franck","Date of Birth": "09-19-1983","Address": "1 chemin des Loges","City": "VERSAILLES"
}
CRUD
● 16 MB limitation
● GridFS (chunks, files) partly loading
● $inc, $mul, $rename, $setOnInsert,
$set,$unset, $min, $max, $currentDate
{ _id: 1, highScore: 800, lowScore: 200 }
CRUD
{ _id: 1, highScore: 800, lowScore: 200 }
db.scores.update(
{ _id: 1 },
{ $min: { lowScore: 150 } }
)
{ _id: 1, highScore: 800, lowScore: 200 }
Find/Aggregation
Find
db.inventory.find( { type: 'food', price: { $lt: 9.95 } } )
Aggregation
$project, $match, $limit, $skip, $unwind,
$group, $sort, $geoNear, $out, $redact
$out
$out
Find/Aggregation
{"_id": "10", "city": "NEW YORK", "state": "NY", "pop": 5574}
db.zipcodes.aggregate( { $group :{
_id : { state : "$state", city : "$city" },pop : { $sum : "$pop" } } },
{ $group : {_id : "$_id.state",avgCityPop : { $avg : "$pop" }
} } )
MapReduce
var map ="function() {" +" for (var key in this) {" +" emit(key, { count : 1 });" +" }" +"}";
var reduce ="function(key, emits) {" +" total = 0;" +" for (var i in emits) {" +" total += emits[i].count;" +" }" +" return { count : total };" +"}";
var mr = collection.MapReduce(map, reduce);foreach (var document in mr.GetResults()) {
Console.WriteLine(document.ToJson());}
Exmaple
Example
Example
Example
Q&A
https://university.mongodb.com/courseshttp://docs.mongodb.org/manual/
http://www.10gen.com/presentationshttps://groups.google.com/forum/#!forum/mongodb-userhttp://stackoverflow.com/questions/tagged/mongodbhttp://robomongo.org/
