MongoDB Operations on a document

Insert Document

• db.COLLECTION_NAME.insert({doc1},{doc2},...)
• e.g.:db.collection.insert({name:‘123‘,age:12},{name:‘cmn‘,sex:‘male‘})

Update document

• db.COLLECTION_NAME.update(SELECTION_CRITERIA,UPDATE_DATA)
• e.g.:db.COLLECTION_NAME.update({user_id:‘2‘,email:‘[email protected]‘},{$set:{email:‘[email protected]‘}})
• The default updates a document to update all eligible documents, plus the option in the update () function mult:true . e.g.:db.COLLECTION_NAME.update({user_id:‘2‘,email:‘[email protected]‘},{$set:{email:‘[email protected]‘},{multi:true}})

Replace a document that already exists

• db.COLLECTION_NAME.save({_id:ObjectId,NEW_DATA})

Delete a document

• db.COLLECTION_NAME.remove(DELETE_CRITERIA)
• db.collection.remove(<将被删除的文档的键值特征，相当于MySQL中的where子句>), e.g.:db.collection.remove({name:‘test‘})

MongoDB Operations on a document