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: View source print?

01	Link string

02	String connectionString = "Mongodb://localhost";

03

04	Database name

05	String databaseName = "MyDatabase";

06

07	Collection name

08	String collectionname = "mycollection";

09

10	Defining MONGO Services

11	Mongo Mongo = new Mongo (connectionString);

12

13	Gets the database of the DatabaseName, which is automatically created if it does not exist

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

15

16	Gets the CollectionName corresponding collection, which is automatically created if no exists

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

18

19	Link Database

20	Mongo. Connect ();

21st

Try

22

{

23	Defines a document object that is stored in two key-value pairs

24	Document doc = new document ();

25	doc["ID"] = 1;

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

27

28	Inserts this document object into the collection

29	Mongocollection.insert (DOC);

30

31	To find a Document object in the collection where the key value pair is id=1

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

33

34	Outputs the value of the key "MSG" in the document object that is found, and outputs

35	Console.WriteLine (Convert.ToString (docfind["MSG"));

36

}

37

Finally

38

{

39	Close link

40	Mongo. Disconnect ();

41

}

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://files.cnblogs.com/lipan/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.