{"id":13949,"date":"2018-04-19T10:28:14","date_gmt":"2018-04-19T10:28:14","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=13949"},"modified":"2021-05-09T13:07:38","modified_gmt":"2021-05-09T07:37:38","slug":"mongodb-create-collection","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/mongodb-create-collection\/","title":{"rendered":"MongoDB Create Collection | MongoDB Drop Collection"},"content":{"rendered":"

In previous articles, we have seen how to create database<\/strong>. We know that there is no command in MongoDB to create a database. Databases are created automatically in it.<\/p>\n

However, there is a command to create a collection. Moreover, we will learn MongoDB create collection. Moreover, we will also learn MongoDB drop collection with examples.<\/p>\n

So, let’s start with MongoDB Create Collection | MongoDB Drop Collection.<\/p>\n

MongoDB Create Collection<\/h2>\n

When we talk about relational databases there are tables. But in MongoDB, there are collections instead. In MongoDB<\/strong>, collections are created automatically when we refer it in any command. MongoDB will create it automatically if it doesn\u2019t exist already.<\/p>\n

\"MongoDB<\/a>

MongoDB Create Collection | MongoDB Drop Collection<\/p><\/div>\n

Example of Create Collection in MongoDB<\/strong><\/h2>\n
db.dataflair.insert({\r\n\u00a0\u00a0\u00a0\u00a0 name: \u201cprachi\u201d\r\n\u00a0\u00a0\u00a0\u00a0 })<\/pre>\n
Above command will create a collection with name \u201cdataflair\u201d if it doesn\u2019t exist. It will be created implicitly. We can also create collection explicitly using \u201ccreateCollection()\u201d<\/em><\/strong> command. We will have to follow the syntax as discussed below.<\/p>\n
db.createCollection(name, options)<\/pre>\n
Before going further we need to know the difference between collections and cappedCollection. The collection has no limitation of size, whereas cappedCollection do. We can specify the size and the maximum number of documents that can be created.<\/p>\n
MongoDB Create Collection has following parameters:<\/p>\n\n\n\n\n\n
Parameter\u00a0\u00a0 <\/strong><\/td>\ntype<\/strong><\/td>\ndescription<\/strong><\/td>\n<\/tr>\n
Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/strong><\/td>\nstring<\/td>\nThe name of the new collection<\/td>\n<\/tr>\n
Options<\/strong><\/td>\ndocument<\/td>\nOptional. Configuration options for creating a\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 capped collection.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Here, the options document contains following fields.<\/p>\n\n\n\n\n\n\n\n\n\n
Field <\/strong><\/td>\nType <\/strong><\/td>\nDescription<\/strong><\/td>\n<\/tr>\n
capped<\/td>\nboolean<\/td>\nOptional. To create a capped collection, Specify true. If you specify true, the size parameter has to be specified.<\/td>\n<\/tr>\n
autoindexid<\/td>\nboolean<\/td>\nOptional. The default value is false. Disables automatic creation of an index on the _id field.<\/td>\n<\/tr>\n
\u00a0size<\/td>\nnumber<\/td>\nOptional. Specifies the maximum size for capped collection. MongoDB removes the older documents once the max size limit is reached.<\/td>\n<\/tr>\n
max<\/td>\nnumber<\/td>\nOptional. The maximum no. of documents allowed in a capped collection. Size has precedence over this.<\/td>\n<\/tr>\n
validator<\/td>\ndocument<\/td>\nOptional. Allows the user to specify validation rules for the collection<\/td>\n<\/tr>\n
Validation level<\/td>\nstring<\/td>\nOptional. Determines the strictness of validation. Use \u201coff\u201d, \u201cstrict\u201d and \u201cmoderate\u201d.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Let\u2019s see an example for MongoDB create collection.<\/p>\n
>use dataflair\r\nswitched to db dataflair\r\n>db.createCollection(\u201cmongodb\u201d,\r\n{ capped:true, size:1000000, max:2})\r\n{ \u201cok\u201d : 1 }<\/pre>\n
To confirm, execute show collections<\/em> command.<\/p>\n
>show collections\r\nmongodb<\/pre>\n
This means that a collection named MongoDB<\/strong> has been created.<\/p>\n
MongoDB Drop Collection<\/h2>\n
After learning to MongoDB create collection, let\u2019s see how can we drop collection in MongoDB. MongoDB Drop Collection is even more easy than creating it. To drop a collection, we need to execute the following command.<\/p>\n
db.collection_name.drop()<\/pre>\n
It will return true if the collection is successfully dropped from MongoDB.
\nAgain, you should check it first if your collection exists or not. For that use show collections command.<\/p>\n
>use dataflair\r\nSwitched to db dataflair\r\n>show collections\r\nmongodb<\/pre>\n
Now for MongoDB Drop collection, follow the below syntax-<\/p>\n
>db.mongodb.drop()\r\n>true<\/pre>\n
Now you have successfully dropped the collection.<\/p>\n
So, this was all\u00a0about\u00a0MongoDB<\/a> Create Collection Tutorial. Hope you like our explanation of MongoDB Drop Collection.<\/p>\n
Conclusion<\/h2>\n
Hence, we have seen how MongoDB creates collections and MongoDB drops collections. Just keep executing some lines of code and everything happens automatically. Now, we will move further creating some more basic concepts on MongoDB. In the next article, we will discuss the data types in MongoDB.
In previous articles, we have seen how to create database. We know that there is no command in MongoDB to create a database. Databases are created automatically in it. However, there is a command...<\/p>\n","protected":false},"author":6,"featured_media":14033,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[3129,8798,8815],"class_list":["post-13949","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mongodb","tag-creating-collection-in-mongodb","tag-mongodb-create-collection","tag-mongodb-drop-collection"],"yoast_head":"\nMongoDB Create Collection | MongoDB Drop Collection - DataFlair<\/title>\n<meta name=\"description\" content=\"MongoDB Create Collection, MongoDB Drop Collection,how to create & drop collection in MongoDB, example of Create collection & Drop collection in MongoDB\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/mongodb-create-collection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MongoDB Create Collection | MongoDB Drop Collection - 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