1. About the driver of MongoDB
MongoDB supports drivers in multiple languages, and we only introduce C# drivers here. There are many kinds of C# drivers, and the form of each driver is roughly the same, but the details are different, so the code cannot be used universally. The more commonly used ones are the official driver and the samus driver. In addition to supporting general forms of operations, the samus driver also supports linq to manipulate data. Everyone prefers this way.
Official driver download address: Click to download
Samus driver download address: Click to download
This article will start with the samus driver to explain database access, international practices, and access to “Hello World!”.
2. Realize HelloWorld access through the samus driver
Before performing the following operations, please make sure that the MongoDB service has been started. If you don’t know how to start the service, please read the previous article. Download the driver, create a new console project, and add a reference to MongoDB.dll. If you downloaded the driver source code, just compile and reference the generated DLL.
The basic code is as follows:
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// link string string cOnnectionString=”mongodb://localhost”; the //Database name string databaseName = “myDatabase”; the //collection name string collectiOnName=”myCollection”; the //Define the Mongo service Mongo mOngo=new Mongo(connectionString); the //Get the database corresponding to databaseName, if it does not exist, it will be created automatically MongoDatabase mOngoDatabase= mongo.GetDatabase(databaseName)as MongoDatabase; the //Get the collection corresponding to collectionName, if it does not exist, it will be created automatically MongoCollection mOngoCollection= mongoDatabase.GetCollection(collectionName)as MongoCollection; the //link database mongo. Connect(); try { //Define a document object and store two key-value pairsDocument doc =new Document(); doc[“ID”] = 1; doc[“Msg”] = “Hello World!”; the // Insert this document object into the collection mongoCollection. Insert(doc); the //Find the document object whose key-value pair is ID=1 in the collection Document docFind = mongoCollection. FindOne(new Document { {“ID”, 1 } }); the //Output the value corresponding to the key “Msg” in the found document object, and output Console.WriteLine(Convert.ToString(docFind[“Msg”])); } finally { //Close the link mongo. Disconnect(); } |
Run the program and print helloword successfully. At the same time, we opened the data folder and found two more files “myDatabase.ns” and “myDatabase.0”.
Three. Summary
Code download: http://files.cnblogs.com/lipan/MongoDB_001.rar
This article succinctly explains the basic access operations, and the next article will combine the MVC framework to implement the basic addition, deletion, query, and modification operations of a single collection in the model layer through MongoDB.
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