MongoDB Tutorial Lesson nineth MongoDB Delete Document

Remove () method

The Remove () method of MongoDB is used to remove a document from the collection. The Remove () method accepts two parameters. The first one is to delete the criteria, the second is the JUSTONE flag:

1. Deletion criteria: (optional) Delete the standard, depending on the file will be deleted.

2. Justone: (optional) If set to TRUE or 1, then delete only one file.

Grammar:

The basic syntax of the Remove () method is as follows

>db.  Collection_name.  Remove(delletion_critteria)       

Example

Consider the following data MyCol collection.

{ "_ID" : ObjectId(5983548781331adf45ec5), "Title":"MongoDB Overview"}{  "_id" : objectid ( 5983548781331adf45ec6  "title" : "NoSQL Overview" }{ "_id"  : objectid5983548781331adf45ec7  " Title ":" Yiibai Overview "}      

The following example will delete all the files whose title is ' MongoDB Overview '

>Db.MyCol.Remove({' Title ':' MongoDB Overview '})>Db.MyCol.Find(){  "_id"   :  objectid (5983548781331adf45ec6  "title" : "NoSQL Overview" Span class= "pun" >}{  "_id"  : objectid ( 5983548781331adf45ec7  "title" : "Yiibai Overview" }>     

Remove only one

If you have more than one record and you want to delete only the first record, set the Justone parameter in the Remove () method

>db.  Collection_name.  Remove(deletion_criteria,1)         

Delete all Files

If you do not specify a delete condition, then MongoDB will delete the entire file from the collection. This is equivalent to the SQL TRUNCATE command.

>db.  MyCol.  Remove()>db.  MyCol.  Find()>             

MongoDB Tutorial Lesson nineth MongoDB Delete Document