Introduction to MongoDB and CRUD operations

Introduction to MongoDB and CRUD operations

• 1.
  MongoDB: • It isa database. • It is document-oriented database. • It is No-SQL database. • NoSQL (originally referring to "non SQL" or "non relational“.
• 2.
  RDBMS VS MongoDB
• 3.
  • MongoDB isan open-source document database. •open-source - refers to any program whose source code is made available for use or modification. • Each document can have the same or different structure. • MongoDB is written in C++.
• 4.
  • It isvery easy to install and setup the MongoDB. • Schema less : Number of fields, content and size of the document can differ from one document to another. • Deep query-ability : supports dynamic queries on documents using a document-based query language . • Ease of scale-out: extra capability and resources can be added to one single component easily. • No complex joins.
• 5.
  1. Go tohttp://www.mongodb.org/downloads Click on Community Server link. Then you will find like below for windows. Download and install it .
• 6.
  1. Go toC drive if you have installed mongodb in c drive. 2. Create folder db inside data. (c:datadb) 3. Open command prompt. 4. Type mongod. Server will start on port 27017. 5. Open another command prompt. 6. Type mongo Now you are ready to do CRUD operations. We will use test database which is by default.
• 7.
  CRUD means Create,Read, Update, Delete Create Operations Create or insert operations add new documents to a collection. If the collection does not currently exist, insert operations will create the collection.
• 8.
  Syntax for reador query documents: db.COLLECTION_NAME.find() Example: db.mycollection.find();
• 9.
  Method for updatedocuments: Syntax: db.COLLECTION_NAME.update(SELECTIOIN_CRITERI A, UPDATED_DATA) Example: db.mycollection.update({name:’Anand’},{$set:{name:’ak’}});
• 10.
  Method for deletedocuments: Syntax: db.collection_name.remove (DELETION_CRITERIA) Example: db.mycollection.remove({name:’ak’});