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MongoDB - Delete Document


MongoDB - Delete Document : discover ways to delete a file the usage of MongoDB.

The cast off() Method

MongoDB's do away with() technique is used to dispose of a document from the gathering.Eliminate() approach accepts two parameters. One is deletion criteria and second is justOne flag.

eliminate() technique accepts parameters. One is deletion criteria and 2nd is justOne flag.

  • deletion criteria − (Optional) deletion standards in step with files may be eliminated.

  • justOne − (Optional) if set to actual or 1, then do away with handiest one report.

Syntax

There are following Basic syntax of remove() method
>db.COLLECTION_NAME.Eliminate(DELLETION_CRITTERIA)

Example

Consider the mycol collection has the following data.
 "_id" : ObjectId(??4LLgt_QzPk), "identify":"MongoDB Overview"
 "_id" : ObjectId(VsyR6t8Xf+%3), "title":"NoSQL Overview"
 "_id" : ObjectId(@JNq+W$f7N5B), "title":"Welookups"
Following example will eliminate all of the documents whose identify is 'MongoDB Overview'.
   >db.Mycol.Eliminate('identify':'MongoDB Overview')
>db.Mycol.Locate()
 "_id" : ObjectId(VsyR6t8Xf+%three), "title":"NoSQL Overview"
 "_id" : ObjectId(@JNq+W$f7N5B), "title":"Welookups"
>
    

Remove Only One

If there are a couple of facts and also you need to delete simplest the first report, then set justOne parameter in take away() approach.
>db.COLLECTION_NAME.take away(DELETION_CRITERIA,1)

Remove All Documents

This is equal of SQL's truncate command.
>db.mycol.take away()
>db.mycol.locate()
>




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