Method HLen

structure/hash.go:536–557

HLen gets the number of fields contained in a hash. It takes a string key 'k' and returns the number of fields in the hash. Parameters: k: The key of the hash table. Returns: int: The number of fields in the hash. error: An error if occurred during the operation, or nil on success.

(key string)

//	int: The number of fields in the hash.
//	error: An error if occurred during the operation, or nil on success.
func (hs *HashStructure) HLen(key string) (int, error) {
	// Convert the parameters to bytes
	k := stringToBytesWithKey(key)

	// Check the parameters
	if len(k) == 0 {
		return 0, _const.ErrKeyIsEmpty
	}

	// Find the hash metadata by the given key
	hashMeta, err := hs.findHashMeta(key, Hash)
	if err != nil {
		return 0, err
	}

	// If the counter is 0, return 0
	if hashMeta.counter == 0 {
		return 0, nil
	}

	return int(hashMeta.counter), nil
}

// HUpdate updates the string value of a hash field.
// It takes a string key 'k', a field 'f', and a value 'v' to update the field's value.