C # accessing MongoDB data

Begin:

Download the driver for C # first. MongoDB offers a variety of mainstream and non-mainstream predictive development drivers.

C # Driver: Bash here

CSharp Driver Tutorial: Bash here

Download the file installation or unpack the package

If you are installing, please go to the installation location to look for, if it is a ZIP archive package, unzip the package to get the following two files:

1. MongoDB.Bson.dll: serialization, JSON-related
2. MongoDB.Driver.dll: Our Drive

No, only these two files are our favorites.

Go on:

Create a new C # project, whether you are vs2008 or vs2010, maybe you have vs2012 in your hand? Send me a copy, too. Thanks for sharing:)

Add a reference to introduce the above two DLLs into the project

Did you start Mongod.exe? Start the service.

Add a namespace inside the code:

Using Mongodb.bson;
Using Mongodb.driver;

Follow [CSharp Driver Tutorial: Punch here] to continue doing. If you do not open [CSharp Driver Tutorial] Do not open, read the full text to see, so as not to disperse energy.

MongoDB connection string, starting with [MongoDB://]. Here, we are connected to the service of this machine
String connectionString = "Mongodb://localhost";
Connected to a mongoserver.
Mongoserver Server = Mongoserver.create (connectionString);

1. MongoDB Connection string
   
   • In the connection string, we can specify the service and connection port formats on the other machines as follows:
   • Mongodb://[username:[email protected]]hostname[:p Ort][/[database][?options]]
   • Simple example: mongodb://server1,server2:27017,server2:27018
   • For further details please see [CSharp Driver Tutorial: Punch here]
2. Mongoserver
   
   • There are several different overloads of how to create them:
   • Mongoserver Create () If you only connect to this machine, and this machine only launches a service, call this method directly, do not need to connect the string
   • Mongoserver Create (Mongoconnectionstringbuilder builder)
   • Mongoserver Create (mongourl URL)
   • Mongoserver Create (String connectionString)
   • Mongoserver Create (URI uri)
   • For further details please see [CSharp Driver Tutorial: Punch here]

Go on:

Add a few more lines of code:

MongoDB connection string, starting with [MongoDB://]. Here, we are connected to the service of this machine
String connectionString = "Mongodb://localhost";
Connected to a mongoserver.
Mongoserver Server = Mongoserver.create (connectionString);
//  -------------------------------------------------------------------------
Open Database TestDB
Mongodatabase db = server. Getdatabase ("TestDB");
Get Collection Employees
Mongocollection collection = db. GetCollection ("Employees");

1. Server. Getdatabase ("TestDB")
   • Open database: TestDB
   • I don't have a testdb library?? Don't worry, don't be confused, don't waste your time on this issue, and if there is no such library, MongoDB will automatically create it for you.
2. Db. GetCollection ("Employees")
   • Get Collection: Employees
   • Well, with the previous lesson, what does it mean, love doesn't exist, and MongoDB developers will create it for us?

Go on:

MongoDB connection string, starting with [MongoDB://]. Here, we are connected to the service of this machine
String connectionString = "Mongodb://localhost";
Connected to a mongoserver.
Mongoserver Server = Mongoserver.create (connectionString);
//  -------------------------------------------------------------------------
Open Database TestDB
Mongodatabase db = server. Getdatabase ("TestDB");
Get Collection Employees
Mongocollection collection = db. GetCollection ("Employees");//-------------------------------------------------------------------------
Create an employee
Bsondocument employee = new Bsondocument
{
{"Name", "Ernest Hemingway"},
{"title", "for Whom the Bell Tolls"}
};
Write it down in the collection.
Collection. Insert (employee);

If your program does not throw any exceptions, then the data is already in. I don't know what bsondocument is.

Let's look at a simple example:

Bsondocument document = new bsondocument {
         {  "name", name},
        {   "City", City}, //not Added if city is null
         {  "DOB", DOB, dobavailable} //not added  if dobavailable is false
   } ;
It saves the data in the form of a key-value pair, in JSON format. MongoDB enables you to store data in complex formats by bsondocument a set of bsondocument.

• There are some important concepts, after reading the article, you must go again: Bsontype, Bsonvalue, Bsonelement, Bsondocument, Mongoserver, Mongodatabase, mongocollection
• here: [CSharp Driver Tutorial: Punch here]

Go on:

Last few lines of small code:

//  -------------------------------------------------------------------------
Query the above data just inserted, this format, look at the querydocument document it
var query = new Querydocument ("name", "Ernest Hemingway");
Traverse results
foreach (Bsondocument emp in collection. Find (query))
{
Bsonvalue There are two ways to take the value, the following two are used one is asxxx, one is toxxx
Console.WriteLine ("Name:{0}\ttitle:{1}", emp["name"]. Asstring, emp["title"]. ToString ());
}

1. querydocument
   • mongocollection books; 
          var query = Query.and ( 
             query.eq ( " author ",   " Kurt Vonnegut "),  
              Query.eq (  "title",    "Cats Craddle ")  
        );  
     
   • not explained, The various details of the query to look at various documents (because I have not read it, can not explain, hehe). As a first step, it is known here that the accumulation of quantity and detail is obtained in the continuous practice. [CSharp Driver Tutorial: Bash here]
2. bsonvalue value
   • emp["name"]. asstring  This is the first method of value. Related to Asint32,asboolean and so on
   • emp["title"]. ToString () This is the second method of value. Related to Toint32,toboolean and so on
   • Note the details:
   • asxxx value, if the type is inconsistent, you can throw an exception InvalidCastException
   • toxxx value method, No exception is thrown and the default value is returned. [CSharp Driver Tutorial: Bash here]

At this point, the first C # program has completed the entire process of accessing MongoDB.

PS: Important Concept:

Bsontype, Bsonvalue, Bsonelement, Bsondocument, Mongoserver, Mongodatabase, mongocollection

Be sure to see. [CSharp Driver Tutorial: Punch here]

C # accessing MongoDB data