MongoDB Tutorial II

MongoDB CREATE database;

The syntax format for MongoDB database creation is as follows:

Use database_name

If the database does not exist, create the database, or switch to the specified database.

If you want to see all the databases, you can use the show dbs command:

> Show dbslocal  0.078GB0.078GB>     

As you can see, the database Runoob we just created is not in the list of databases, and to display it, we need to insert some data into the Runoob database.

> Db.. Insert ({ "name" : "Rookie Tutorial" writeresult ({  "ninserted"  : 1  }) > show Dbslocal 0.078gbrunoob 0.078gb< Span class= "PLN" >test 0.078gb> 
     

MongoDB Delete Database

switch databases with use Datebase_name first

The following example we deleted the database Runoob.

First, look at all the databases:

> Show dbslocal   0.078GB0.078GB0.078GB     

Next we switch to database Runoob:

> Use runoobswitched to db runoob>  

To execute the Delete command:

> db.  Dropdatabase(){"dropped":"Runoob","OK":1}   

Finally, we pass the show DBS command database for deletion success:

> Show dbslocal  0.078GB0.078GB>     

Delete Collection

The collection delete syntax format is as follows:

DB.  Collection.  Drop()    

MongoDB Tutorial II