Decr method in Memcached is commonly used when you need to decrement the value of a key. This is typically useful in scenarios where you are tracking counts or implementing rate limiting.
Here's how to use the
Decr method with a Golang Memcached client:
First, establish a connection to your memcached server:
Next, let's use the
Decr method. In this example, we'll first set a key
counter to 100 and then decrement it:
In the above code snippet,
mc.Decrement("counter", 10) will decrement the
counter key's value by 10. The function returns the new value so you can check the result instantly. Please note that the value associated with the key has to be numeric, otherwise
Decr will return an error.
Decrmethod. It can return an error if the key doesn't exist, or if the value isn't a numeric type.
Q: What happens if I try to decrement a key that doesn't exist?
Decr function will return an error if the key does not exist. You should always handle these errors in your code.
Q: Can I decrement a value below zero? A: No, you cannot. Memcached stores all numbers as unsigned integers. If you attempt to decrement a number below zero, it will underflow and become incredibly large.