- Usage:
-
XREVRANGE key end start [ COUNT count ]
- Complexity:
- O(N) with N being the number of elements returned. If N is constant (e.g. always asking for the first 10 elements with COUNT), you can consider it O(1).
- Since:
- 5.0.0
This command is exactly like XRANGE, but with the notable difference of
returning the entries in reverse order, and also taking the start-end
range in reverse order: in XREVRANGE you need to state the end ID
and later the start ID, and the command will produce all the element
between (or exactly like) the two IDs, starting from the end side.
So for instance, to get all the elements from the higher ID to the lower ID one could use:
XREVRANGE somestream + -
Similarly to get just the last element added into the stream it is enough to send:
XREVRANGE somestream + - COUNT 1
Examples
127.0.0.1:6379> XADD writers * name Virginia surname Woolf
"1714701492147-0"
127.0.0.1:6379> XADD writers * name Jane surname Austen
"1714701492157-0"
127.0.0.1:6379> XADD writers * name Toni surname Morrison
"1714701492167-0"
127.0.0.1:6379> XADD writers * name Agatha surname Christie
"1714701492177-0"
127.0.0.1:6379> XADD writers * name Ngozi surname Adichie
"1714701492187-0"
127.0.0.1:6379> XLEN writers
(integer) 5
127.0.0.1:6379> XREVRANGE writers + - COUNT 1
1) 1) "1714701492187-0"
2) 1) "name"
2) "Ngozi"
3) "surname"
4) "Adichie"
History
| Version | Change |
|---|---|
| 6.2.0 | Added exclusive ranges. |