Commandsltrim
LTRIM
Apply for Redis Developer Course
|
Redis Regular Inspection / Technical Support
|
Redis Enterprise Server
|
|---|
Remove data outside the specified index range
Usage is ltrim key start stop.
Useful when you want to keep only the specified range and delete the rest.
Example
| Command> | lpush mylist value1 value2 value3 value4 |
| Result> | 4 |
| Command> | lrange mylist 0 -1 |
| Result> | 0) value4 1) value3 2) value2 3) value1 |
| Command> | ltrim key 1 2 |
| Result> | OK |
| Command> | lrange key 0 -1 |
| Result> | 1) value3 2) value2 |
Using negative indexes
Use negative numbers for reverse indexes.
Example
| Command> | lpush mylist value1 value2 value3 value4 |
| Result> | 4 |
| Command> | ltrim key -2 -1 |
| Result> | OK |
| Command> | lrange key 0 -1 |
| Result> | 1) value4 2) value3 |
Be careful with the range
If you specify a range that does not exist, all data is deleted. Be careful.
Example
| Command> | ltrim key 10 10 |
| Result> | OK All items were deleted |
| Command> | lrange key 0 -1 |
| Result> | No result |
Syntax
LTRIM key start stop
- Available since version 1.0.0.
- Time complexity is O(N). N is the number of elements to remove.
| Related commands | LREM, LINSERT, LSET, DEL |
| Clients for Java | Jedis, Lettuce, Redisson | Clients for C | Hiredis |
| << LRM | LTRIM | LMOVE >> |
|---|
Email
답글이 올라오면 이메일로 알려드리겠습니다.
