MongoDB Learning Notes (ii) Implementation of basic data operation through Samus Drive

Traditional relational databases are generally composed of three levels of databases (database), tables (table), records (record), and MongoDB are made up of three levels (db), Collections (collection), document objects (documents). MongoDB for tables in relational databases, but there is no column, row, and relationship concept in the collection, which embodies the characteristics of pattern freedom.

one, about the MongoDB drive

MongoDB supports multiple language drivers, here we only introduce C # drivers. There are many types of C # drivers, each with roughly the same form, but the details are different, so the code is not universal. The more commonly used is the official drive and the Samus drive. The Samus driver supports LINQ manipulation of data in addition to general forms of operation. Everyone prefers this way.

Official Driver Download Address: Click to download
Samus Driver Download Address: Click to download

This article will start from Samus drive to explain the database access, international practice, Access "Hello world!".

Second, through Samus Drive to realize HelloWorld access

Before doing the following, please make sure the MongoDB service is turned on, do not know how to open the service, please see article. Download the driver, create a new console item, and add a reference to the MongoDB.dll, if you download the driver source code, compile it again to refer to the generated DLL.

The basic code is as follows:

Copy Code code as follows:


//Link string


string connectionString = "Mongodb://localhost";





//Database name


string databaseName = "MyDatabase";





//Collection name


string collectionname = "mycollection";





Define MONGO Services


Mongo Mongo = new Mongo (connectionString);





//get databasename corresponding database, automatically create
if no exists

mongodatabase mongodatabase = MONGO. Getdatabase (DatabaseName) as mongodatabase;





//Gets the CollectionName corresponding collection and automatically creates the
if it does not exist

mongocollection<document> mongocollection = mongodatabase.getcollection<document> (collectionName) As mongocollection<document>;





//LINK Database


MONGO. Connect ();


Try


{


//Define a Document object, deposit two key value pairs


Document doc = new document ();


doc["ID" = 1;


doc["MSG"] = "Hello world!";





//Insert this Document object into the collection


Mongocollection.insert (DOC);





//Find a Document object in the collection where the key value pair is id=1


Document DocFind = Mongocollection.findone (new Document {{"ID", 1}});





//Outputs the value of the key "MSG" in the Document object found, and outputs the


Console.WriteLine (convert.tostring (docfind["MSG"));


}


finally


{


//Close link


MONGO. Disconnect ();


}

Run the program to successfully print Helloword. At the same time, we opened the Data folder, found more than two files "Mydatabase.ns" and "mydatabase.0."

Third, summary

Code Download: Http://xiazai.jb51.net/201307/yuanma/MongoDB_001.rar

This concise explanation of the basic access operation, the next article will be combined with the MVC framework through the MONGODB to achieve the model layer of a single set of basic additions and deletions to check the operation.

Author: Lee (Lipan)
Source: [Lipan] (http://www.cnblogs.com/lipan/)