MongoDB Insert Query

Hi All,

Today I will show you basic usages of mongodb. First we start with opening mongo console using this command:

$ mongo

If your server have started correctly there's no error show in terminal/console and you will enter mongodb console like this:

MongoDB shell version: 3.2.11
connecting to: test
Server has startup warnings: 
2016-12-05T07:17:23.208+0700 I CONTROL  [initandlisten] 
2016-12-05T07:17:23.208+0700 I CONTROL  [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
> 

 

1. Show Existing Databases

Use below command to show existing databases in your mongodb server.

> show dbs

There's should be showed a listing of existing databases like this:

> show dbs
djamblog     0.078GB
local        0.078GB
zips         0.078GB
> 

2. Insert data to collections

To start and create new database, type this command:

> use exampledb

Now you can create and insert collections using this command:

> db.city.insert({citiName:"Jakarta",provName:"DKI Jakarta"})

If insert successful, you can see message below insert command like this:

WriteResult({ "nInserted" : 1 })

Let me explain a little. There are 3 words of insert command separated by dot, they are:

• db: must included in every query
• city: collections name
• insert: query command/syntax

3. Check Collections and Data

To check newly created collections, just type this command:

> show collections

It will show collections, include system collections like this:

city
system.indexes

Query for show data in collections is like this:

> db.city.find()

It will return some document in collections like this:

{ "_id" : ObjectId("584a13d5b65761be678d4dd4"), "citiName" : "Jakarta", "provName" : "DKI Jakarta" }

As you see, result of query returns a JSON formatted data and that is one of mongodb feature is using json like document.

That its for now.

Thanks