Insert data in MongoDB 2016-05-26 22:40
We need create table before inserting data into structure database(Mysql, PostgreSQL, Oracle etc.). It is no need to create collection for using MongoDB. The db.collection.insert() method adds new document into database. MongoDB will create collection when it not exist. You can also create collection manually then insert document.
> use user_database
switched to db user
> db.user.insert({"name":"Henry"})
WriteResult({ "nInserted" : 1 })
> db.user.find()
{ "_id" : ObjectId("5747b01d4bca08a38db22ad3"), "name" : "Henry" }
> db.user.insert([{"name":"Xi"},{"name":"Justin","age":27}])
BulkWriteResult({
"writeErrors" : [ ],
"writeConcernErrors" : [ ],
"nInserted" : 2,
"nUpserted" : 0,
"nMatched" : 0,
"nModified" : 0,
"nRemoved" : 0,
"upserted" : [ ]
})
> db.user.find()
{ "_id" : ObjectId("5747b01d4bca08a38db22ad3"), "name" : "Henry" }
{ "_id" : ObjectId("5747b1562a9f793542c63acc"), "name" : "Xi" }
{ "_id" : ObjectId("5747b1562a9f793542c63acd"), "name" : "Justin", "age" : 27 }
As you can see db.collection.insert() support insert one document or array of documents. After inserting data MongoDB return WriteResult or BulkWriteResult. nInserted in them means how many documents were inserted successfully. If there are any errors during the inserting WriteResult with writeConcernError will return.