Exploring the World of Car Rental Management: Building a Python Application

Article 12: Deleting Customers

Welcome back to our exploration of building a Python-based car rental management system. In Part 12, we will delve into the process of deleting customers from the database. This is a crucial functionality for maintaining a clean and up-to-date customer database.

The Importance of Deleting Customers

While adding and updating customer information is essential, there are situations where deleting customer records becomes necessary. This can include instances where a customer has permanently left the system or for any other valid reasons. Deleting customers ensures that the database remains relevant and avoids unnecessary data clutter.

Step-by-Step Guide to Deleting Customers

Let's go through the steps of deleting a customer from our Python application:

Ask the user for the customer ID they want to delete:
```
 c_id = input("Enter Customer ID: ").upper()
```
Check if the customer exists in the database:
```
 sql = "SELECT * FROM customer WHERE c_id = %s"
 mycursor.execute(sql, (c_id,))
 data = mycursor.fetchall()
```
If the customer is not found, provide appropriate feedback to the user. If found, proceed with the deletion.

Display customer details and confirm with the user:

 if data:
     print("Customer Details:")
     # Display customer details here
     confirm = input(f"Do you want to remove '{data[0][1]}' from the Customer table? [Y/N]: ").upper()

Ensure that the user wants to proceed with the deletion.

If the user confirms, execute SQL to delete the customer:

 if confirm == 'Y':
     sql = "DELETE FROM customer WHERE c_id = %s"
     mycursor.execute(sql, (c_id,))
     mycon.commit()
     print("Customer successfully deleted")

Ensure to handle the situation if the user chooses not to proceed.

Optionally, ask if the user wants to delete another customer and repeat the process.

 while True:
     choice = input("Do you wish to delete another customer? [Y/N]: ").upper()
     if choice not in ('Y', 'N'):
         print("Invalid choice entered, enter the specified choice [Y/N]")
         continue
     break

If the user chooses 'N', exit the deletion process.

Ensuring Data Integrity and References

When deleting customers, it's essential to consider data integrity, especially if there are references to customer records in other tables (e.g., reservations). Before deleting a customer, you may want to check and handle these references appropriately to avoid potential issues.

Conclusion

Part 12 has guided us through the process of deleting customers from our car rental management system. Deleting customers ensures that our database remains clean and relevant.

In Part 13, we'll explore how to add Cars to the Inventory. Adding new cars to the rental fleet.

The Link to my code -> [github.com/bryanspacex/Rentals] (constantly updated)

Exploring the World of Car Rental Management: Building a Python Application - Part 12