MongoDB Study Notes (2) use the samus driver to perform basic data operations

In the last issue, I introduced MongoDB and introduced the MongoDB installation method. In this issue, we will continue to follow the instructions of the author to implement basic data operations through the samus driver.

Traditional relational databases are generally composed of three levels: database), table), and record. MongoDB is composed of database), collection), and document object document) three layers. MongoDB has no concept of columns, rows, and links for tables in relational databases, which reflects the free mode.

I. MongoDB driver

MongoDB supports drivers in multiple languages. Here we only introduce the C # driver. There are many types of C # drivers, each of which has the same form, but each has its own details. Therefore, the Code cannot be used in general. The official driver and samus driver are commonly used. In addition to common operations, the samus driver also supports data manipulation in the linq mode. Everyone prefers this method.

Drive: https://github.com/mongodb/mongo-csharp-driver/downloads

Samus DRIVER: https://github.com/samus/mongodb-csharp

This article explains database access, international practices, and "Hello World!" With the samus driver !".

2. Use the samus driver to implement HelloWorld access

Before proceeding to the following operations, make sure that the MongoDB service is enabled. You do not know how to enable the service. Please refer to the previous article. Download the driver, create a console project, and add a reference to MongoDB. dll. If you download the driver source code, compile and reference the generated DLL.

The basic code is as follows:

 
 

  
  
// Link string
  
  
String connectionString = "mongodb: // localhost ";
  
  
// Database Name
  
  
String databaseName = "myDatabase ";
  
  
// Set Name
  
  
String collectionName = "myCollection ";
  
  
// Define the Mongo Service
  
  
Mongo mongo = new Mongo (connectionString );
  
  
// Obtain the database corresponding to databaseName. If the database does not exist, it is automatically created.
  
  
Relational Database relational database = mongo. GetDatabase (databaseName) as relational database;
  
  
// Obtain the collection corresponding to collectionName. If the collection does not exist, it is automatically created.
  
  
Collect collection <Document> collect collection = collect database. GetCollection <Document> (collectionName) as collect collection <Document>;
  
  
// Link to the database
  
  
Mongo. Connect ();
  
  
Try
  
  
{
  
  
// Define a Document Object and store two key-value pairs
  
  
Document doc = new Document ();
  
  
Doc ["ID"] = 1;
  
  
Doc ["Msg"] = "Hello World! ";
  
  
// Insert this document object into the set
  
  
Collections collection. Insert (doc );
  
  
// Search for the document object whose key-value pair is ID = 1 in the collection
  
  
Document docFind = collections collection. FindOne (new Document {"ID", 1 }});
  
  
// Output the value corresponding to "Msg" in the searched document object, and output
  
  
Console. WriteLine (Convert. ToString (docFind ["Msg"]);
  
  
}
  
  
Finally
  
  
{
  
  
// Close the link
  
  
Mongo. Disconnect ();
  
  
}
 
 

Run the program and print helloword. At the same time, we opened the data folder and found two more files, "myDatabase. ns" and "myDatabase.0 ".

Iii. Summary

Code download: http://files.cnblogs.com/lipan/MongoDB_001.rar

This article briefly explains basic access operations. The next article will use the MVC framework to implement basic addition, deletion, query, modification operations for a single set at the model layer through MongoDB.

Source: http://www.cnblogs.com/lipan/archive/2011/03/08/1977691.html