redis常见操作命令-list

1、 将1个或者多个的value压入key的表头：LPUSH key value [value ...]

127.0.0.1:6379> LPUSH list abc

(integer) 1

127.0.0.1:6379> LGET list

(error) ERR unknown command 'LGET'

127.0.0.1:6379> LRANGE 0 -1

(error) ERR wrong number of arguments for 'lrange' command

127.0.0.1:6379> LRANGE list 0 -1

1) "abc"

127.0.0.1:6379> LPUSH list abc def

(integer) 3

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "abc"

2、将1个value压入到key表头，当不存在key的时候失败： LPUSHX key value

127.0.0.1:6379> KEYS *

1) "list"

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "abc"

127.0.0.1:6379> LPUSHX list woaini

(integer) 4

127.0.0.1:6379> LRANGE list 0 -1

1) "woaini"

2) "def"

3) "abc"

4) "abc"

127.0.0.1:6379> LPUSHx mylist aaaa

(integer) 0

127.0.0.1:6379> EXISTS mylist

(integer) 0

127.0.0.1:6379>

3、返回list的长度：HLEN key ； 如果key不存在就解释成一个空表返回0， 如果key不是表类型，返回一个错误。

127.0.0.1:6379> LRANGE list 0 -1

1) "woaini"

2) "def"

3) "abc"

4) "abc"

127.0.0.1:6379> LLEN list

(integer) 4

127.0.0.1:6379> EXISTS mylist

(integer) 0

127.0.0.1:6379> LLEN mylist

(integer) 0

3、返回list中指定的元素：LRANGE key start end ； 区间偏移是是start和end决定的，start最小从0开始，end可以是负数，-1代表最后一个 -2代表倒数第二个 等等，

127.0.0.1:6379> keys *

1) "list"

127.0.0.1:6379>

127.0.0.1:6379> type list

list

127.0.0.1:6379> LRANGE list 0 -1

1) "woaini"

2) "def"

3) "abc"

4) "abc"

127.0.0.1:6379> LRANGE list 0 1

1) "woaini"

2) "def"

127.0.0.1:6379> LRANGE list 0 -2

1) "woaini"

2) "def"

3) "abc"

127.0.0.1:6379> LRANGE list 0 -3

1) "woaini"

2) "def"

4、移除并返回list被移除的头元素：LPOP key

127.0.0.1:6379> LRANGE list 0 -1

1) "woaini"

2) "def"

3) "abc"

4) "abc"

127.0.0.1:6379> LPOP list

"woaini"

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "abc"

127.0.0.1:6379> LPOP list

"def"

127.0.0.1:6379> LRANGE list 0 -1

1) "abc"

2) "abc"

5、将列表key下标为index的元素设置为value： LSET key index value ；如果key不存在或者index超出范围就返回一个错误

127.0.0.1:6379> LRANGE list 0 -1

1) "abc"

2) "abc"

127.0.0.1:6379> LSET list 0 def

OK

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

127.0.0.1:6379> LSET list 1 woaini1314

OK

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "woaini1314"

127.0.0.1:6379> LSET list 123 woaini1314

(error) ERR index out of range

6、根据count的值，移除列表中值为value的元素：

count可以为： cout>0 从表头到表尾，移除与value相等的元素，数量为count

count可以为：count=0 移除表中所有的与value相等的元素

count可以为：count<0 从表尾到表头，移除与value相等的元素，数量为count的绝对值

如果value为空或者list彼此在的时候总返回0：

LREM key count value

127.0.0.1:6379> LPUSH list def

(integer) 4

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "woaixiaofang"

3) "def"

4) "woaini1314"

127.0.0.1:6379>

127.0.0.1:6379> LREM list 3 def

(integer) 2

127.0.0.1:6379> LRANGE list 0 -1

1) "woaixiaofang"

2) "woaini1314"

7、将一个或者多个value插入list的尾部：RPUSH key value [value ..] ；如果不存在将会创建，如果key类型不是list那么会返回错误

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

127.0.0.1:6379> RPUSH list aaaaaaaa

(integer) 5

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

127.0.0.1:6379> RPUSH list bbbb

(integer) 6

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

6) "bbbb"

127.0.0.1:6379> RPUSH list bbbb mmmm

(integer) 8

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

6) "bbbb"

7) "bbbb"

8) "mmmm"

8、将value插入list的尾部，当且仅当list存在的时候： RPUSHX key value

127.0.0.1:6379> keys *

1) "list"

127.0.0.1:6379> type list

list

127.0.0.1:6379> RPUSHX mm 12354

(integer) 0

127.0.0.1:6379> EXISTS mm

(integer) 0

127.0.0.1:6379> keys *

1) "list"

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

6) "bbbb"

7) "bbbb"

8) "mmmm"

127.0.0.1:6379> RPUSHX list tianxia

(integer) 9

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

6) "bbbb"

7) "bbbb"

8) "mmmm"

9) "tianxia"

9、弹出并且返回key的尾部：RPOP key

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

6) "bbbb"

7) "bbbb"

8) "mmmm"

9) "tianxia"

127.0.0.1:6379> RPOP list

"tianxia"

127.0.0.1:6379> LRANGE list 0 -1

1) "def"

2) "abc"

3) "woaixiaofang"

4) "woaini1314"

5) "aaaaaaaa"

6) "bbbb"

7) "bbbb"

8) "mmmm"

10、RPOPLPUSH source dest ：

命令在一个原子时间内，执行一下动作：

1）、将source尾部第一个元素弹出，返回给客户端；

2）、将source弹出的内容插入到列表，座位dest列表的头元素；

如果source不存在，就不执行操作，如果source和dest是同一个list，则执行旋转操作；

127.0.0.1:6379> LPUSH source 111 222 333 444 555

(integer) 5

127.0.0.1:6379> LRANGE source 0 -1

1) "555"

2) "444"

3) "333"

4) "222"

5) "111"

127.0.0.1:6379> LPUSH dest aaa bbb ccc ddd eee fff

(integer) 6

127.0.0.1:6379> LRANGE dest 0 -1

1) "fff"

2) "eee"

3) "ddd"

4) "ccc"

5) "bbb"

6) "aaa"

127.0.0.1:6379> RPOPLPUSH source dest

"111"

127.0.0.1:6379> LRANGE source 0 -1

1) "555"

2) "444"

3) "333"

4) "222"

127.0.0.1:6379> LRANGE dest 0 -1

1) "111"

2) "fff"

3) "eee"

4) "ddd"

5) "ccc"

6) "bbb"

7) "aaa"

127.0.0.1:6379> RPOPLPUSH source source

"222"

127.0.0.1:6379> LRANGE source 0 -1

1) "222"

2) "555"

3) "444"

4) "333"