INCRBY and DECRBY in Redis - Mini Project: Build & Apply

Using INCRBY and DECRBY in Redis

📖 Scenario: You are managing a simple online store's inventory using Redis. You need to keep track of the stock count for a product and update it as customers buy or return items.

🎯 Goal: Build a Redis key that stores the stock count for a product and update it using INCRBY and DECRBY commands to increase or decrease the stock.

📋 What You'll Learn

Create a Redis key called product_stock with an initial stock value.

Set a variable for the number of items sold or returned.

Use DECRBY to decrease the stock when items are sold.

Use INCRBY to increase the stock when items are returned.

💡 Why This Matters

🌍 Real World

Managing inventory counts in an online store or warehouse system where stock levels change frequently.

💼 Career

Understanding how to update numeric values efficiently in Redis is important for backend developers and system administrators working with caching and real-time data.

1

Create the initial stock key

Create a Redis key called product_stock and set its value to 100 to represent the initial stock count.

Redis

SET product_stock 100  # Your code here

Need a hint?

Use the SET command to create a key with a number value.

2

Set the number of items sold

Create a variable called items_sold and set it to 3 to represent how many items were sold.

Redis

SET items_sold 3  # Your code here

Need a hint?

Assign the number 3 to the variable items_sold.

3

Decrease stock using DECRBY

Use the DECRBY command on product_stock with the value of items_sold to reduce the stock count.

Redis

DECRBY product_stock 3  # Your code here

Need a hint?

Use DECRBY product_stock 3 to subtract 3 from the stock.

4

Increase stock using INCRBY

Create a variable called items_returned set to 2 and then use the INCRBY command on product_stock with items_returned to add back to the stock.

Redis

SET items_returned 2
INCRBY product_stock 2  # Your code here

Need a hint?

Assign 2 to items_returned and then increase the stock by 2 using INCRBY.