redis
Khóa học miễn phí Redis – Lists nhận dự án làm có lương
Redis – Lists
Redis Lists are simply lists of strings, sorted by insertion order. You can add elements in Redis lists in the head or the tail of the list.
Maximum length of a list is 232 – 1 elements (4294967295, more than 4 billion of elements per list).
Example
redis 127.0.0.1:6379> LPUSH tutorials redis (integer) 1 redis 127.0.0.1:6379> LPUSH tutorials mongodb (integer) 2 redis 127.0.0.1:6379> LPUSH tutorials mysql (integer) 3 redis 127.0.0.1:6379> LRANGE tutorials 0 10 1) "mysql" 2) "mongodb" 3) "redis"
In the above example, three values are inserted in Redis list named ‘tutorials’ by the command LPUSH.
Redis Lists Commands
Following table lists some basic commands related to lists.
| Sr.No | Command & Description |
|---|---|
| 1 |
Removes and gets the first element in a list, or blocks until one is available |
| 2 |
Removes and gets the last element in a list, or blocks until one is available |
| 3 |
Pops a value from a list, pushes it to another list and returns it; or blocks until one is available |
| 4 |
Gets an element from a list by its index |
| 5 |
Inserts an element before or after another element in a list |
| 6 |
Gets the length of a list |
| 7 |
Removes and gets the first element in a list |
| 8 |
Prepends one or multiple values to a list |
| 9 |
Prepends a value to a list, only if the list exists |
| 10 |
Gets a range of elements from a list |
| 11 |
Removes elements from a list |
| 12 |
Sets the value of an element in a list by its index |
| 13 |
Trims a list to the specified range |
| 14 |
Removes and gets the last element in a list |
| 15 |
Removes the last element in a list, appends it to another list and returns it |
| 16 |
Appends one or multiple values to a list |
| 17 |
Appends a value to a list, only if the list exists |
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