Flash cards
Review the key moves
What is the main idea behind Python MongoDB Create Database?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ pymongoPut the learning moves in the order that makes the concept easiest to apply.
Creating a Database
To create a database in MongoDB, start by creating a MongoClient object, then specify a connection URL with the correct ip address and the name of the database you want to create.
MongoDB will create the database if it does not exist, and make a connection to it.
Example
Create a database called "mydatabase":
import pymongo
myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]Important: In MongoDB, a database is not created until it gets content!
MongoDB waits until you have created a collection (table), with at least one document (record) before it actually creates the database (and collection).
Check if Database Exists
Remember
In MongoDB, a database is not created until it gets content, so if this is your first time creating a database, you should complete the next two chapters (create collection and create document) before you check if the database exists!
You can check if a database exist by listing all databases in you system:
Example
Return a list of your system's databases:
print(myclient.list_database_names())Or you can check a specific database by name:
Example
Check if "mydatabase" exists:
dblist = myclient.list_database_names()
if "mydatabase" in dblist:
print("The database exists.")