Insert Document in MongoDB's Collection


We can use insert() or save() methods to insert document(data) in  collection MongoDB.
Syntax                                                                                                               
Basic syntax of insert() command is as follows:


>db.COLLECTION_NAME.insert(document)


Example


>db.mycol.insert({
   _id: ObjectId(7df78ad8902c),
   title: 'MongoDB Overview',
   description: 'MongoDB is no sql database',
   by: 'Codefari',
   url: 'http://www.codefari.com',
   tags: ['mongodb', 'database', 'NoSQL'],
   likes: 100
})


mycol is a collection name, MongoDB will create collection if doesn't exist in the database then insert the document into it. to know how to create a collection click here.
if we did not specify the _id parameter, MongoDB assigns a unique Object_Id for this document. _id is 12 bytes hexadecimal number unique for every document in a collection. 12 bytes are divided as follows:


_id: ObjectId(4 bytes timestamp, 3 bytes machine id, 2 bytes process id, 3 bytes incrementer)


If we want to insert multiple documents in a single query, then we will be passed an array of the document in insert() command.

Example


>db.post.insert([
{
   title: 'MongoDB Overview',
   description: 'MongoDB is no sql database',
   by: 'Codefari',
   url: 'http://www.codefari.com',
   tags: ['mongodb', 'database', 'NoSQL'],
   likes: 100
},
{
   title: 'NoSQL Database',
   description: 'NoSQL database doesn't have tables',
   by: 'Codefari',
   url: 'http://www.codefari.com',
   tags: ['mongodb', 'database', 'NoSQL'],
   likes: 20,
   comments: [  
                      {
         user:'user1',
         message: 'My first comment',
         dateCreated: new Date(2013,11,10,2,35),
         like: 0
      }
   ]
}
])



we can use this way also to insert the document use db.post.save(document). Save () method will work the same as the insert() method when we did not specify_id in the document. When we have specified _id then it will replace whole data of document containing _id as specified in save() method.

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