Redis
Redis的入门应用
Redis是key-value型数据库
Redis 里的单行命令都是原子的 是为了同时有多个用户对同一个数据修改
string
-
set key value
-
子主题 1
-
SET server:name "fido" -
GET server:name => "fido" -
EXISTS server:name => 1 -
EXISTS server:blabla => 0 -
SET connections 10 -
INCR connections => 11 -
INCR connections => 12 -
DEL connections -
INCR connections => 1 -
It is also possible to increment the number contained inside a key by a specific amount: -
INCRBY connections 100 => 101 -
And there are similar commands in order to decrement the value of the key. -
DECR connections => 100 -
DECRBY connections 10 => 90
-
-
-
get key
-
exists key
-
DEL key
-
EXPIRE key 100
-
100秒后删除
-
TTL key
- 显示还有几秒删除
- 只要set key 一次 之前的计时失效 TTL key 返回-1
- 返回-2说明计时过了 这东西被删了
-
PERSIST key
-
让这个计时结束
- 永久保存
-
-
-
INCR key
- INCRBY key 100
-
DECR key
- DECRBY key 100
-
不能简单的get key value=value+1 set key value
list
-
对头尾操作较快 且 有序号的
-
lpush friend "yanhao"
-
rpush friend "yanhao"
-
lpush friend 1 2 3 4
-
执行顺序是
- lpush friend 1
- lpush friend 2
- lpush friend 3
- lpush friend 4
-
所以结果是 4 3 2 1
-
-
lrange friend 0 -1
-
切片
-
example
-
LRANGE friends 0 -1 => 1) "Sam", 2) "Alice", 3) "Bob"
-
LRANGE friends 0 1 => 1) "Sam", 2) "Alice"
-
LRANGE friends 1 2 => 1) "Alice", 2) "Bob"
-
lrange friend 0 10
-
- "Sam", 2) "Alice", 3) "Bob"
-
-
lrange friend -3 -1
-
- "Sam", 2) "Alice", 3) "Bob"
-
-
-
-
lset friend 0 "yanhao"
- 把friend这个list里面的第0个元素改成"yanhao"
-
lpop friend
- rpop friend
- 子主题 2
-
llen
set
-
sadd setname "yanhao"
-
return 0
- 没加成功,因为本来就有这个key了
-
return 1
- 加成功了
-
-
sismember setname "yanhao"
-
smembers friend
-
sincr
-
sdecr
-
srem friend "yanhao"
- return 0
- return 1
-
srandmeber friend 2
- 随机返回数据成员
-
spop
- 随机删
-
sunion set1 set2
sorted set
-
在set的同时加上一个用来排序的东西
-
ZADD fruit 1 apple
-
ZADD fruit 2 banano
-
Zrange fruit 0 1
- 切片
hashes
-
hset user:37 name "yanhao"
-
hgetall user:37
-
hmset user:37 name "yanhao" age 17
- 同时设置多个
-
hget user:37 name
-
hincrby user:37 name 2
- name会加2
-
hdel
分支主题 2
分支主题 3
XMind: ZEN - Trial Version