Delete document in MongoDB 2016-05-29 20:16
Use db.collection.remove() method to delete document in MongoDB. You can define a query to make it delete documents match query. How to define a query click Query document in MongoDB. If you want remove all documents of this collection just use empty query to match all documents. MongoDB will delete all document of this collection.
> use user_database
switched to db user_database
> db.user.insert({name:"Henry"})
WriteResult({ "nInserted" : 1 })
> db.user.insert({name:"Xi"})
WriteResult({ "nInserted" : 1 })
> db.user.insert({name:"Justin",age:27})
WriteResult({ "nInserted" : 1 })
> db.user.find()
{ "_id" : ObjectId("574b822696af9dffe372c22b"), "name" : "Henry" }
{ "_id" : ObjectId("574b822b96af9dffe372c22c"), "name" : "Xi" }
{ "_id" : ObjectId("574b824096af9dffe372c22d"), "name" : "Justin", "age" : 27 }
> db.user.remove({name:"Henry"})
WriteResult({ "nRemoved" : 1 })
> db.user.find()
{ "_id" : ObjectId("574b826196af9dffe372c22e"), "name" : "Justin", "age" : 27 }
{ "_id" : ObjectId("574b826696af9dffe372c22f"), "name" : "Xi" }
> db.user.remove({})
WriteResult({ "nRemoved" : 2 })
Querying document before deleting is a good habit. This will prevent accidentally deleted documents.