Create Database In MongoDB

In Python, To establish a connection between the MongoDB Client database and Python programming language. we need first to install the "pymongo" module.

In MongoDB, we don't need to explicitly create a database. MongoDB creates a database automatically when we first store data in it.

However, we can switch to a specific database or check if it exists.

Here's how we can handle database creation and switching in Python using "pymongo":

Import library and configuration for mongoclient:

After importing "pymongo", we must provide a connection URL and database name to MongoClient.

Example:

# import pymongo library
import pymongo

# Connection URL and database name
uri = "mongodb://localhost:27017/"
database_name = "your_database_name"

# Connect to MongoDB server
client = pymongo.MongoClient(uri)

Checking Database Exist:

Check if the database exists in MongoDB Server.

Example:

if database_name in client.list_database_names():
    print(f"The database '{database_name}' already exists.")
else:
    print(f"The database '{database_name}' does not exist.")

Access Database Explicity:

We can also explicitly access a database using the below syntax.

Syntax:

db = client.your_database_name

Full Code:

# import pymongo library
import pymongo

# Connection URL and database name
uri = "mongodb://localhost:27017/"
database_name = "your_database_name"

# Connect to MongoDB server
client = pymongo.MongoClient(uri)

# Check if the database exists
if database_name in client.list_database_names():
    print(f"The database '{database_name}' already exists.")
else:
    print(f"The database '{database_name}' does not exist.")

# Access or create the database
db = client[database_name]

# We can also explicitly access a database like this:
# db = client.your_database_name

Replace "mongodb://localhost:27017/" with the connection string for your MongoDB server.
Replace "your_database_name" with the name of the database you want to create or access.
The "list_database_names()" method is used to get a list of all database names on the MongoDB server.
If the specified database name exists, it prints a message indicating that the database already exists. Otherwise, it prints a message indicating that the database does not exist.
Finally, it accesses or creates the specified database using the "client[database_name]" syntax.

Check Databases and Collections:

The below commands will display the database list from the MongoDB Client and collections list from specific Database.

Commands:

# show databases will list all databases
show dbs;

# check for collections within databases
show collections

Note:

Remember that MongoDB automatically creates a database when we first store data in it.

So, we don't need to explicitly create a database unless we want to check its existence or switch to it.

<-- MongoDB Config

Create Collection -->