How to Setup MongoDB and Use It...!!

 MongoDB is a free and open source, cross platform, document oriented database program. Classified as a NoSQL database program. MongoDB uses JSON-like document with schemas. MongoDB is developed by MongoDB Inc.

MongoDB supports field, range queries and regular expression searches. Queries can return specific fields of document and also include user defined JavaScript functions. Queries can also be configured to returns a random sample of result of a given size.

These are the Key Featrures of Mongodb

  • General purpose database, almost as fast as the key:value NoSQL type.
  • High availability.
  • Scalability (from a standalone server to distributed architectures of huge clusters). This allows us to shard our database transparently across all our shards. This increases the performance of our data processing.
  • Aggregation: batch data processing and aggregate calculations using native MongoDB operations.
  • Load Balancing: automatic data movement across different shards for load balancing. The balancer decides when to migrate the data and the destination Shard, so they are evenly distributed among all servers in the cluster. Each shard stores the data for a selected range of our collection according to a partition key.
  • Native Replication: syncing data across all the servers at the replica set.
  • Security: authentication, authorization, etc.

Now will see how to download and install MongoDB...


1)  first you have do download and install the MongoDB to your computer. 
   Go to this link (Download mongodb) and download the software according      to your windows type.

2) Open the exe file and install it.

3) Create a folder in C drive called "data" and then create a folder called "db"     inside the data folder which you created first. (C:\data\db) Because data       directory is used by MongoDB to save all the files related to databases. 

4) Then run the command prompt and type this commands to check weather         MongoDB is working.  
  •     Go to the path where you installed the MongoDB  
           cd C:\Program Files\MongoDB\Server\3.4\bin mongod

  •        Then type and run this comnnand  
            mongod

5) If you getting an error like this,

            
       you have to update your windows using this file which is given in the link.     select the correct uptede file according to your operating system.
       Update windows


Now will see basic Commands and Queries in MongoDB... 

1)  View available DBs
       show dbs

 2) View current DB
       db

 3) Create new DB or Switch to existing DB
       use <database name>

 4) Insert a Record
       db.<collection name>.insert({ });

        Example :- db.student.insert{
                         "name":"Damith Perera",
                         "age":"23",
                         "subjects":["SE","AF","SA"]
                       }

 5) Find a Record 
       db.<collection name>find({ <propertes>})

        Example :- db.students.find({"name":"Damith Perera"})

 6) Add a new value to existing Record
       db.<collection name>.update({<properties>},{$push:{<properties>}})

        Example :- db.students.update({"name":"Damith Perera"}, {$push:                             {"subjects":"DS"}})

 7) Update a new value with existing value
       db.<collection name>.update({<properties>},{$set:{"properties"}})
    
       Example :- db.students.update({"name":"Damith Perera"}, {$set:                               {"age":"24"}})

 8) Remove a Record
       db.<collection name>.remove({<properties>})

        Examples :- db.students.remove({"name":"Damith Perera"})

Comments

Post a Comment

Popular posts from this blog

Assignments and Grades integration in Moodle LMS - LTI 1.3 (With client_credentials base OAuth 2.0)

Image
Moodle is the world’s most popular and most used learning management system. It’s easy to see why, the Moodle Learning Management System (LMS) is a flexible, open-source, and free to download learning management solution. This article describes how we need to work with moodle APIs in order to manipulate assignments and grades. These details are specific to LTI 1.3 standards and using client credential base OAuth 2.0 In LTI 1.3 flow, the main part is OAuth 2.0. When we work with moodle APIs, it needs to send the access token along with each API call. That means before work with the end-points we have to have the access token with us. This article specifies the client credential base assess token and to get that access token we need an external tool in Moodle LMS.  Let's see the process step by step....  This process can be divided into three parts.  Create an external tool in Moodle.  Generate access token. Manipulate assignments and grade APIs.  1) Create an ext...
Read more
Image
How to link WebStorm IDE with GitHub windows application The main advantage of link WebStrom with GitHub windows application is you can do the version controlling directly through the WebStorm IDE. When you are doing a project  using WebStorm IDE you can use git command which are use to version controlling in the IDE it self, if you have linked with GitHub windows application. Now will see how to link WebStorm IDE with GitHub windows application.. step 1) Install WebStorm IDE. step 2) install GitHub windows application and clone with the project which is  in the GitHub or GitLab repository. step 3) Open that project using WebStorm. IF you have done those three step already follow these steps to link WebStorm and GitHub windows application. step 4) Go to this file path and copy it.           C drive -> Users -> <your user file> -> Appdata -> Local ->        ...
Read more

Cross Site Request Forgery Protection

Image
Cross Site Request Forgery Protection PHP web application What is CSRF (Cross Site Request Forgery protection) ?  Cross-Site Request Forgery (CSRF) is an attack that forces an end user to execute unwanted actions on a web application in which they're currently authenticated. CSRF attacks specifically target state-changing requests, not theft of data, since the attacker has no way to see the response to the forged request. With a little help of social engineering (such as sending a link via email or chat), an attacker may trick the users of a web application into executing actions of the attacker's choosing. If the victim is a normal user, a successful CSRF attack can force the user to perform state changing requests like transferring funds, changing their email address, and so forth. If the victim is an administrative account, CSRF can compromise the entire web application. In this blog I will be discuss about two prevention methods for CSRF.   ...
Read more